ChromeLoader: New Stubborn Malware Campaign

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Executive Summary

In January 2022, a new browser hijacker/adware campaign named ChromeLoader (also known as Choziosi Loader and ChromeBack) was discovered. Despite using simple malicious advertisements, the malware became widespread, potentially leaking data from thousands of users and organizations.

Instead of more traditional malware like a Windows executable (.exe) or Dynamic Link Library (.dll), the malware authors used a browser extension as their final payload. The browser extension serves as adware and an infostealer, leaking all of the user’s search engine queries. We discovered significant changes and additions of capabilities throughout this campaign's evolution, and we predict further changes as this campaign continues.

In this article, we examine the technical details of this malware, focus on the evolution between its different versions and describe changes in its infection process. This article also reviews new variants that have not yet been publicly reported.

Palo Alto Networks customers using Cortex XDR and WildFire receive protections against this newly discovered malware out of the box.

Introduction to ChromeLoader Malware

ChromeLoader is a multi-stage malware family. Each variant contains different stages throughout its infection chain, but the infection chain often looks quite similar among the different variants, including malicious browser extensions used in all variants.

The different payload extensions we tracked had a hardcoded version added by the attacker. This labeling routine contributed to the research process, linking the different versions to the same campaign – and by their correct chronological order.

The various extension versions are related to different variants of this malware. We differentiate the variants not only by the related extension version but also by the techniques used throughout their infection chain and the targeted operating systems.

The different variants are mentioned in this article by their detection order and referenced throughout this document as follows:

Variant 0: Named that way since it was active before Variant 1 (the first variant that was discovered in the wild). It used AutoHotKey (AHK)-compiled executables and version 1.0 of the Chrome extension. Its first known attack occurred in December. In this article, this variant is discussed fourth (in the section titled “The Real First Windows Variant”).

Variant 1: Mentioned first (beginning in the “Infection Vector” section). It used versions 2.0-4.4 of the Chrome extension as its payload and a DotNet executable that launches obfuscated PowerShell as its dropper. It was mainly active in January.

Variant 2: Mentioned third (see the section “Second Windows Variant”). It uses the 6.0 version of the Chrome extension and uses an obfuscated executable as its initial dropper. It has been active since March.

MacOS Variant: Mentioned second (see the section “MacOS Variant”). This variant focuses on MacOS computers (while other variants target Windows users only). Uses the 6.0 version of the extension. Active since March.

Infection Vector (Variant 1)

The first variant of ChromeLoader Malware (referred to in the Introduction as Variant 1) was first seen in January 2022.

The chain of events starts when a user is enticed to download a torrent or a cracked video game through malvertising campaigns on ad sites and social media platforms. The user scans a QR code on these web pages and is redirected to a compromised website that presents an ISO image (an optical disc image file, typically used with CD/DVD). The user downloads the ISO image, mounts it by double-clicking and executes content contained in the mounted ISO image.

Deployment

The downloaded ISO image contains the following:

• Microsoft.Win32.TaskScheduler.dll: a legitimate .NET DLL signed by Microsoft, used by other .NET programs for integrating with the scheduled tasks mechanism.
• Language folders: contains a resource file used by the mentioned DLL.
• CS_installer.exe and its config file: malicious executable written by the malware authors (note that the name might change from one version to another). In some versions, the authors (probably accidentally) left its PDB file, containing its debug data, inside this folder as well
• _meta.txt: a text file found in advanced versions of this malware, containing scrambled ASCII letters.

Most files in this directory are hidden, and the ordinary user will not notice them when opening this directory using Windows File Explorer. The only non-hidden file is CS_installer.exe, which tempts the victim to double-click it to complete the software installation download.

The victim launches CS_installer.exe by double-clicking it. In most cases, the executable presents the message shown below in Figure 5, indicating that the program failed to execute. However, this is an attempt by the authors to mislead their targets.

The executable is a non-obfuscated program written in .NET, so .NET reflectors can decompile it to read the source code. The code shown in Figure 6 is revealed when the executable is loaded into a reflector. This code creates a scheduled task configured to execute a malicious base64 encoded PowerShell command every ten minutes. The task name is constructed from the Chrome string concatenated with a random suffix from the namesDict array.

The script content derives from the _meta.txt file, unscrambled by the following predefined function below in Figure 7, which applies simple character replacement.

Some of the features mentioned were missing in earlier versions of this variant of the malware. For instance, in the version shown in Figure 8, which was discovered only one week before the version mentioned in Figures 6 and 7, the authors did not use a descramble function but simply hardcoded the encoded PowerShell script in the .NET executable and used the predefined ChromeLoader name for their task instead of generating a more randomized suffix.

The attacker uses the encoded PowerShell script for downloading and loading a malicious browser extension into the user’s Chrome browser.

Figure 11. An attempt to load the payload into the user’s browser.

The evolution from early versions of this malware to later ones is also seen in the encoded PowerShell script. Figure 12 shows PowerShell script executed by an earlier version of this variant, which is significantly shorter and contains less complicated code.

Dropper Statistics

ChromeLoader attacks on Palo Alto Networks Cortex XDR customers were blocked by our Behavioral Threat Protection module starting from the first day of this campaign. However, we were curious about the following stages of this attack. Consequently, we decided to continue our research, tracking down the attacker’s footprints and intentions.

The scheduled task is using the malware to download a malicious Chrome extension and installing it to the victim’s browser. The URL hosting the Chrome extension is hardcoded in the obfuscated PowerShell command and changes between the different versions.

Payload

The payload of the malware is a Chrome extension – every downloadable extension has the same format:

Using some definitions in the manifest file, and using a known legitimate picture, the extension claims to be legitimate and harmless. However, the extension asks for elevated privileges. Requested privileges include accessing browser data, manipulating web requests and accessing every possible URL address, which legitimate browser extensions would not do.

The Javascript file conf.js declares constant variables, which will use the main script background.js later. The C2 domain is stored in _ExtDomNoSchema.

background.js is a one-line JavaScript file containing all of the extension’s functionality; it is heavily obfuscated but can be converted to readable JavaScript code in a short series of steps. However, any attempt to deobfuscate this code using known public JavaScript deobfuscation tools will fail due to reasons which will be detailed later.

This script uses various obfuscation techniques to hide its purpose and malicious code. One of the first functions executed is responsible for copying standard JavaScript functions and objects into new objects with scrambled names, which will later use the script for decoding the final payload, located in this script's last instructions.

During the entire execution of this script, the authors use switch-case-oriented programming to make their program harder for malware analysts to read and understand.

The program loops using the E3 variable shown above in Figure 22 and acts differently for each value. When the relevant flow in the switch case has ended, the program changes the value of E3 to its next instruction. The program also uses the obfuscated object names mentioned previously. In Figure 22, we added the original object name in a comment below the relevant code line.

After understanding the obfuscated names and switch-case-oriented programming, we can better analyze the purpose of this code section. It uses a hardcoded four-sized array of integers, translating it to the associated ASCII characters and sorting it by randomized order. Later, this array will be joined to a string, and the program will search for a defined function in that name. The execution flow will start over if the function isn’t found.

This stage reveals another obfuscation technique in the script. One of the key features used by standard deobfuscation tools is dropping unreferenced functions and objects. Often, it helps to shorten the code, leaving out complicated parts which will never actually run – removing functions whose whole purpose is to mislead a malware analyst. However, in this case, using deobfuscation tools drops an essential function, and the script will be stuck in an endless loop without it.

The function h0QQ is not directly referenced even once during the script execution. Yet, the previously mentioned code section using a randomized sort algorithm will eventually attempt to execute it, since h0QQ is a permutation of the 0hQQ string. If h0QQ does not exist, the code simply tries to sort the characters and repeatedly looks for a function name.

This function returns a long scrambled string, XORed by a hardcoded key, and then splits into an array of strings.

The malware eventually uses these strings to decode its malicious code. It references the string at the relevant index in this array instead of hardcoding the string name in the code.

We exported the mentioned list members after utilizing a debugger to execute the initialization code. Then we used a Python script to deobfuscate the remaining sections of the JavaScript code.

Infostealer and Adware

For communicating with the malicious extension, the authors used command and control servers (C2s), which are different from the installation server used for installing the extension previously. The malware uses various extension features, giving it a strong foothold in the user’s browser.

When the extension is installed, it adds two Chrome alarms (alarms allow the developer to install a callback / scheduled task that will be triggered periodically). When these alarms are triggered, two corresponding functions are being called:

• When the ad alarm is triggered, the extension asks the C2 for an advertisement and presents it in a new tab.
• The hb callback is triggering functions that communicate with the C2, informing it of the current state of the execution.

Another interesting activity can be seen in the code shown in Figure 29. The extension installs a listener, which allows it to intercept every outgoing request, and uses it to check whether the request was sent to a search engine – Google, Yahoo or Bing. If it does, the extension will send the search details to the C2, leaking the victim’s thoughts and interests.

In addition, the extension uses different mechanisms to verify that it executes properly. For example:

• A hard-coded header named dd for each outgoing packet to the C2. This could be used by the C2 to identify the different distribution channels/affiliates.

• Cancelling search suggestions, probably in order to make sure that the search queries were intended by the user.
• Uninstalling existing Chrome extensions from the browser. It also sends the names of the extensions to the C2 and gets back an allowlist json, in order to exclude chosen extensions from being removed.
• Disabling every attempt to access chrome://extensions and open chrome://settings instead to prevent the user from uninstalling this malicious extension.

Version Control

Most malicious extensions contained a file named conf.js alongside the main Javascript code stored at background.json. This conf.js (or manifest.json, or background.js file if conf.json is missing) file stores relevant configuration for the extension: the C2’s hostname (e.g., krestinaful[.]com and tobepartou[.]com), the verification header’s value of dd, the extension name, and its version. It seems like the version information is accurate – there are several differences between the versions we saw (2.0, 3.0, and 4(.0,.3,.4)). (For our observations on the relationship between variants and versions, please see the “Introduction” section.)

Version 2.0 (First seen Jan. 4, 2022):

Missing functionality:

• No advertisements for victims.
• Search engine query gathering from Google only.
• No deletion of existing browser extensions.

Version 3.0 (Jan. 6, 2022):

Added functionality:

• Search engine queries are now gathered from Yahoo and Bing as well.
• SetWithExpiry() and GetWithExpiry() functions added and used for storing variables (i.e., query URL) and deleting existing extensions, respectively.
• Existing extensions deletion mechanism.

4.* versions (Jan. 7, 2022):

Added functionality:

• More obfuscations throughout the script.
• Chrome advertising mechanism added.
• Changed the hardcoded C2 URL.
• Chrome alert mechanism.

MacOS variant

In March 2022, a new variant emerged targeting MacOS users. This variant remains active and uses similar techniques to install its payload and hide its actions. It uses the same infection method of directing victims to compromised pay-per-download websites to install its dropper.

In this case, the dropper is a disk image (DMG) file – the MacOS implementation for ISO files – containing several files, including one bash script. The bash script resembles the scheduled PowerShell script in multiple manners:

• Downloads the payload – a browser extension from a remote installation server.
• Loads the payload into the target’s browsers – Google Chrome and the built-in Safari browser.

In more advanced cases, instead of hardcoding the download execute portion in the bash script, the authors encoded these commands in a separate file, then decoded and executed by the bash script using OpenSSL.

The downloaded extension functions were similar to those used in the Windows OS versions. The MacOS variant uses the same obfuscation method to execute the same vital components – gather search engine queries and present advertisements. In addition, new C2 addresses were used in this version.

Based on the version number of the malicious extensions delivered by this variant, the attackers reference the MacOS variant as later than the Windows variants, which fits the timeline of infections in this campaign. In our research, the extensions found with this variant were labeled as the 6.0 version of this malware.

Second Windows Variant (Variant 2)

In March 2022, several weeks after the last known infection of Variant 1, we identified a new campaign with multiple similarities to the first one, which makes us believe that we are actually facing another variant of the same ChromeLoader malware, referred to in this blog as Variant 2.

The infection vector for this Variant 2 is identical to Variant 1. Users are enticed to download a torrent or cracked video game through malvertising campaigns on pay-per-install sites and social media.

ISO images used for Variant 2 contain new executables. Victims would only see a Windows shortcut, which they would double-click to install the desired software or watch the movie.

However, the ISO image contains other hidden files executed when the victim launches the Windows shortcut (.lnk file). The .lnk file simply runs a batch script named resources.bat. The script, in turn, extracts the contents of app.zip into %APPDATA%. The zip archive contains an executable named Tone.exe, which is eventually stored into a registry run key by the batch script, making the infection persistent.

Like Variant 1, Variant 2 installed the same type of Chrome extension. The malware launched a cmd.exe process, which in turn executed powershell.exe. The PowerShell process executed WMI queries, used for installing a new scheduled task named chrome *, launching another encoded PowerShell command.

When analyzing the above-mentioned obfuscated PowerShell script, we were faced with a script used as a dropper. This script doesn’t directly install a new Chrome extension, so it does not exactly match Variant 1’s PowerShell script pattern. However, the structure and use of variables resembles the behavior of Variant 1.

Using XQL queries, when the installation server is available, the PowerShell script creates and loads the familiar malicious Chrome extension (the 6.0 version, used in the latest MacOS variant).

The Real First Windows Variant – December 2021 (Variant 0)

Due to its multiple infection incidents, this malware family has drawn worldwide attention in the cybersecurity community.

As mentioned earlier, we detected different versions of this malware during our investigation. Each version was labeled not only by us but also by the malware authors themselves. The earliest labeled version we detected was 2.0. Therefore, we were confident that this wasn’t the first time these attackers struck, and we were determined to expose the actual first version of this malware.

Due to the attackers’ history of frequent payload updates, we were convinced that the first infection case occurred relatively close to the currently reported infection case in January 2022.

Pivoting over the installation server domains used for the Variant 1 PowerShell dropper revealed that another piece of malware used some of these domains as its installation servers in December 2021.

This malware was an executable file written using AutoHotKey (AHK) - a framework used for scripting automation.

Using this tool, the programmer can write short, easy-to-understand scripts using the AHK syntax. Then, by the programmer’s definitions, the framework creates matching hooks that will cause the execution of these scripts.

When transforming AHK scripts into Windows executables, the original script source code is pasted into the end of the executable, making the investigation process for the researcher much more effortless compared to the other variants, which used heavy obfuscation. In this case, the hardcoded script contained the following source code, which looks quite similar to the PowerShell droppers we already analyzed:

In short, this dropper downloads a payload from its installation server. We can assume that this payload is another browser extension by the variable name used for the downloaded payload (Extension_Name).

After a more thorough investigation, we found the downloaded extension. Unsurprisingly, it also contained features related to the ChromeLoader malware family – but more importantly, it was labeled version 1.0 (!)

These extensions were quite similar to the rest of the extensions related to this family, with one main difference – this time, the extension was not obfuscated. It even contained some of the author’s comments regarding different code sections.

Conclusion

This blog documents different examples of a new malware family, ChromeLoader, spread using malicious advertisements. This malware demonstrates how determined cybercriminals and malware authors can be: In a short time period, the authors of ChromeLoader released multiple different code versions, used multiple programming frameworks, enhanced features, advanced obfuscators, fixed issues, and even adding cross-OS support targeting both Windows and MacOS.

This malware is used for hijacking victims’ browser searches and presenting advertisements – two actions that do not cause serious damage or leak highly sensitive data. However, based on the wide distribution the attackers gained in such a short time, they were able to inflict heavier damage than the damage inflicted by the two primary functions of the Chrome Extension.

Additionally, the authors were quite organized, labeling their different malware versions and using similar techniques throughout their attack routines. This probably made their lives easier while developing their attack framework and maintaining their attack chains, but unintentionally, this also made the investigation process significantly easier. In fact, it improved the research ability so much that we were able to detect two new versions of this malware – the first one and the latest, which have never been linked to this malware family before.

Finally, this attack chain demonstrates two rising trends among malware authors that security products and even common users should be aware of – the use of ISO (and DMG) files and the use of browser extensions.

Product Coverage

Palo Alto Networks customers using Cortex XDR Prevent or and Pro receive protections from such campaigns in different layers, including the Local Analysis Machine Learning module, Behavioral Threat Protection, BIOC and Analytics BIOCs rules that identify the tactics and techniques that ChromeLoader uses at different stages of its execution.

Most rules are not customized for ChromeLoader and are based on unusual, rare behaviors – and therefore provide protection against many additional malware families and campaigns that use the same methods.

The following rules provide behavioral detections and preventions that block this malware at different stages for Cortex XDR customers:

In addition, you can use the following XQL queries to detect ChromeLoader variants during their different execution stages.

Variant 1 (January) – Installer

Variant 2 (March) – Scheduled Task Installer

Variant 2 (March) – Tone.exe Extraction

MacOS Variant – Extension Download Encrypted

Suspicious Browser Extension Loaded

Palo Alto Networks customers using WildFire also receive protections from this threat.

Indicators of Compromise

Variant 1 ISO hashes
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Variant 1 executable hashes (aka CS_Installer.exe)
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Variant 2 ISO hashes

e72a42ad27c06ba0a9951705423a3650a0c4a1f8c18c5782ab98e2e72021bbb8
26bce62ea1456b3de70d7ac328f4ccc57fe213babce9e604d8919adf09342876
44f9680710ba7635bb3bfe025b087e85d51857d9618c5ffa5c247ccdc8bca3c3
5ee2b7ea46cc3f34b796ab4992e778938c057490695e9109f016fc7a1b308395
a0ff3b427c77594fa48d79ed52d372bd2a8baae54ee85b243d86d9dd493ffbc6
f3176bcd28b89e4ae7a4426c82c8b73ca22c62ecbc363296193c8f5becef973c
424347b6f5caca8174d1b0ac2e32867a4201a41176fed1af7b3e1a0716fc7e46
c67b87cb7420500e4b0bb6500f1875bc77a7d96997ed2850d8142dfd9636da29
8f2da6c721251edd251addb795552ed54d89fb53d2a470d8a7f807e77aac402c
e0d57152524e79a07e5b7d7b37831cb7596cd3afe651b4eecaf4123b1af1ffa6
606d49ae054e13461bad3e405cc5996462c14bd48e94fe8a63f923fbb7c14b71
7ef7bdf8ea2f8751f45482453bf7441d2b2f92d743324afdf1afc11ea248c56d
84c93f1f7bdc44e8e92be10bf5e566f3116c9962c35262643fe2084c3b8d1bb5
4673c1f8d307b70c4be837e842cfdf5cce60c6bf793ae85a1bce07c9c15fe14d
0257dccfdeb1bc9683334d0d964c72ea0eeedbfda33cba1f60a395cca8e516da
0d510dbcf8ed5c7b81206598886a7fbd86f11d36871612ba066d6ec85723fada
e920dbc4741114f747a631928e398ef671fe9133b6aab33991d18150b4fcd745
3d65f5a060f8ecc92de9f5e0754b8f6c129cb9a243bf1504a92143ac3bc5a197
11174dbaca376288fd59c66d1c00255ad6c034beff96a075e833897ef3a113cc
44e77ac27a8b7d9227d95feb87bad1cc2a4ed2172c85f5e16d335a4d62d385f4

Variant 2 executable hashes (aka Tone.exe)
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Variant 0 executable hashes

0bc3516e327fea0b5f65299366182d1e7577c9998d0cbd07891709f51fb0ac47
0e1c5477ea71fdc1271e63989107b2d855c685c6c2303f297a610eb875520ec0
140162b2c314e603234f2b107a4c69eb24aece3a3b6bd305101df7c26aee5f8e
1dbc8aa73b64a1a607bcbe448347314d9a456d4d31a6cf846e25277b575bbb5b
32aa2f66b96a95a00b032758232fc09e18439395466660b995a7d82905ef0637
3ff8e17ee3c130e327a614400f594fec404c42188c0e7df0ce3b2bb3a3c1aff6
57c0f3d24452b68d756577af78e809e2da12694691e62448bb132c12311360ec
8ef4026b254dd0918bf3ace7741b26ff52a52ef024c721d8129c5ccfa4ccde24
d2b1b9642884a6839f09204135944c02c7437f7e692d07bb0d0269c4ff8316bb
d8d18baa934a4f1ad6777f2ca862be8d3b3a59a1fedb8d2a8e50f0a419793a15
e4ab0e5ecbd6c87432f08398b7f7424a248f98ff780e0adb710edd0698bf5434
45510bf70bc9063392ac0514f4e26431b9c38631ed0e61b6847fe9385f5eb17c
e4ab0e5ecbd6c87432f08398b7f7424a248f98ff780e0adb710edd0698bf5434
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MacOS DMG hashes

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Zipped extension hashes

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C2 and Installation Servers

Installation Servers

brokenna[.]work
etterismype[.]co
idwhitdoe[.]work
ithconsukultin[.]com
learnataloukt[.]xyz
rsonalrecom[.]co
yflexibilituky[.]co
yeconnected[.]com

ableawid[.]com
airplanegoobly[.]com
baganmalan[.]com
balljoobly[.]com
balokyalokd[.]com
boogilooki[.]com
bookimooki[.]com
carfunusme[.]com
carmoobly[.]com
chairtookli[.]com
chookiebooki[.]com
choopinookie[.]com
ckgrounda[.]com
computermookili[.]com
dubifunme[.]com
dudesurfbeachfun[.]com
exkcellent[.]com
funbeachdude[.]com
ketobepar[.]com
kooblniplay[.]com
letfunhapeme[.]com
lookiroobi[.]com
lookitoogi[.]com
madorjabl[.]com
malanbagam[.]com
mokkilooki[.]com
myeducatio[.]com
nakasulba[.]com
ndinterper[.]com
ndworldwi[.]com
nookiespooti[.]com
oempafnyfi[.]com
saveifmad[.]com
siwoulukdli[.]com
slootni[.]com
sonalskills[.]com
tabletoobly[.]com
toogimoogi[.]com
toukfarep[.]com
uiremukent[.]com
ukrawinrusyes[.]com
utfeablea[.]com
voobmijump[.]com
xoomitsleep[.]com
yalfnbagan[.]com
yalokmalos2[.]com
yescoolservmate[.]com
yourretyeq[.]com

tcaukthw[.]com
tooblycars[.]com
koooblycar[.]com
rooblimyooki[.]com
yooblygoobnku[.]com
playkooblni[.]com
rockslootni[.]com
muendakere[.]xyz
mployeesihigh[.]xyz
adiingsinsp[.]xyz

ajorinryeso[.]xyz
ktyouexpec[.]xyz
learnataloukt[.]xyz
ngwitheaam[.]xyz
ptonnervent[.]xyz
ukmlasttyye[.]xyz
ukseseem[.]xyz
withyourret[.]xyz

C2s

betasymbolic[.]com
krestinaful[.]com
tobepartou[.]com
tobedirectuke[.]com
eandworldw[.]com
etobepartou[.]com
kfareputfeabl[.]com
blesasmetot[.]com
siwoulukdlik[.]com
sforourcompa[.]com

Additional Resources

CS_Installer Threat Remediation Scripts
ChromeLoader: a pushy malvertiser
QR codes on Twitter deliver malicious Chrome extension
Choziosi Loader Analysis
Malicious Chrome Browser Extension Exposed