MISP and VT Collections

At VirusTotal we are actively working on expanding integrations with the most popular tools used by the infosec community. 

Today we are thrilled to announce tighter integration with MISP through our most recent feature to track threat campaigns and malware toolkits, VT Collections. We have created two new workflows: 

• The ability to export VT Collections to STIX 2, a well-known threat intel exchange format.  
• Functionality to create a collection from IoCs contained in a MISP Event. 

This will allow the exchange of IoCs bidirectionally between MISP and VirusTotal.

VT Collection to MISP

You can export all IOCs contained in a collection using the top-right corner export icon, click on it and select Download all IoCs as STIX:

This will generate a json file that can be imported into MISP using the left menu option, Import from…

MISP Event to VT Collection

To tackle this part of the workflow we have developed a new MISP Module called VirusTotal Collections. This module uses the event exporting option to send IoCs to VirusTotal and create the collection.

To create a collection from a MISP Event you can use the Download as…  button while inspecting an Event, choose VirusTotal Collections as an export format option.

After a few seconds you will get a text file confirming the export process has finished. In the text file you can find the url of the new collection.

And that’s it. If you are a MISP user, ping your MISP instance admin to activate the export module and tell us what you think about this integration in this form (2 minutes).

Stay tuned for more MISP contributions.

Happy Hunting!

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Build a Champion SOC with VirusTotal and Palo Alto Networks Cortex XSOAR

With Palo Alto Networks’ Cortex XSOAR as your champion and VirusTotal as the sharpened blade, your SOC will decimate threats and reduce analyst strain. Together, VirusTotal and Cortex XSOAR enable your security and IT teams to discover context and solve incidents in a cost effective way. 

Join us next March 31st for an expert-led discussion on leveraging threat intelligence in your SOC. Register here.

VirusTotal Cortex XSOAR packs enable you to:

• Orchestrate custom threat feeds through Cortex XSOAR to perform live IoC matching and launch retroactive threat hunts from your SIEM or historical log archives.

• Leverage improved and early detection with crowdsourced {Yara, SIGMA, IDS} threat reputation for files, domains, IPs, and URLs.

• Streamline your triage process with prioritized SOC alerts based on severity and threat categories.

• Inform your EDR platform by feeding it highly relevant and undetected threats identified with VirusTotal YARA.  

Not only that. Our new improved VirusTotal packs allow you to create custom IOC feeds. You can simply create your own VT Hunting Livehunt rules and feed them into XSOAR. Here you can learn how:

Check out the four XSOAR VirusTotal content packs and discover which is right for you, and try one for free through the Cortex XSOAR Marketplace platform. New to Cortex XSOAR? Download the Community Edition to discover how VirusTotal and XSOAR can work for you! 

Building a Champion SOC

The quest to best protect an organization requires several top-of-the-line weapons for an analyst to wield. To handle the daily torrent of alerts and threats, security teams need access to the sharpest, most up-to-date threat intelligence to provide the missing critical pieces of information like files, URLs, domains, and more.  Unfortunately, security teams rarely have the time or resources to maintain a full arsenal of rich, ingestible intelligence. 

To provide security teams with the best tools to combat threat actors, VirusTotal and Cortex XSOAR are thrilled to streamline threat intelligence through the Cortex XSOAR Marketplace. As one of the largest threat intelligence services in the world, VirusTotal is expanding its research, enrichment, and malware hunting capabilities to XSOAR - a market leading Security Orchestration Automation and Response platform for unified case management, automation, and real time collaboration.  

With one click installation, your security team can easily and accurately pull the necessary context to surface threats in your system. Subscribe to VirusTotal from the XSOAR Marketplace to access the VirusTotal API directly for critical context regarding your incident response and alert management. With advanced orchestration from Cortex XSOAR, your SOC can create custom threat feeds and very easily plug them straight into your security stack to search for both current and retroactive breaches. 

VirusTotal offers four content packs each with a monthly allotment of lookups. Starter gives 5,000 lookups per month, Respond gives 150,000, Enrich gives 1 million, and Triage gives 100 million. Leverage these powerful solutions to seamlessly enrich  your alerts with cost-effective confidence. Furthermore, IoC matching is driven by the real-time view of the threat landscape as seen by VirusTotal, powered by millions of users each month. This unparalleled enrichment provides confident, accurate context for unrivaled global visibility into threats.

As a final note, please note that both Palo Alto Networks Cortex XSOAR Marketplace points customers and any other user can still provision custom premium API keys from VirusTotal and operate XSOAR with these. The new VirusTotal XSOAR packs do not replace existing workflows or licensing options.   

Happy hunting!

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VirusTotal Multisandbox += SecneurX

VirusTotal welcomes SecneurX to the multi-sandbox project. This new behavioral analysis platform is helping provide additional details on Windows executables, Office documents, and Android APKs.

In their own words:

SecneurX Advanced Malware Analysis (SnX) platform provides visibility and context into advanced threats with its extensive malware analysis & detection capabilities. The analysis platform is based on a unique architecture that emulates an enterprise environment for analyzing the most evasive and concealed malware. It performs both static and dynamic behavior analysis of different file types (.doc, .pdf, .msg, .eml, .xlsx, .exe, .ppt, .csv, .apk etc.) and generates a detailed report describing the malware behavior. Extracted Indicators of compromise (IOCs) and human-readable behavior reports can be used to augment existing intelligence data and help to give "context" about IPs, domains, URLs, Registry, Process activity, file names, and hashes.

On VirusTotal you can find the SecneurX reports on the Behavior tab:

Let's take a deeper look at some interesting samples showcasing SecneurX capabilities:

EXE file which spreads via SMB protocol

602b3c6dba465a535293d06ff498354a6a5631299f8edbaba4bec7d4df98e1e6

This EXE is a crypto mining worm that uses exploits to steal credentials and spreads laterally to other machines in the network. It communicates with its CNC and transfers its malicious binary through SMB protocol to other machines on the local network.

602b3c6dba465a535293d06ff498354a6a5631299f8edbaba4bec7d4df98e1e6

Click on the full report icon, to see the SecneurX detailed report.
A few interesting points in the full report are highlighted:

VirusTotal enterprise customers may search other samples on VirusTotal that use this firewall command you can use the behaviour_processes file search modifier in a query similar to:

behaviour_processes:"netsh firewall add portopening tcp 65533 DNSd"

An example searching for scheduled tasks:

behaviour_processes:"schtasks /create /ru system"

Email with attached password-protected XLS spreadsheet which launches PowerShell

This email message contains an attached password-protected XLS spreadsheet which when triggered launches a Living of the Land attack using an obfuscated PowerShell script to download a second-stage attack payload. SecneurX extracts and executes them

d8fa4daa50b9bc2273cb6736f559970ac71338629131778577faff906f5c10f6

Within the process tree we can see powershell commands to create a TLS connection, You can search VirusTotal to find other samples using this technique with a query like behaviour_processes:"System.Net.SecurityProtocolType" and behaviour_processes:powershell

Android App (APK) with multi-stage payload downloader showing Joker malware behavior

The APK: 1e2c99c68390baefa7d9eba4a429f9b009aa4ade281909831fa2c50a944ae5ab downloads malicious payload via HTTP. In this VT-Graph view we can investigate how it is related to other malware samples.

Excel spreadsheet abusing the legacy equation editor to execute a custom payload

This excel spreadsheet https://www.virustotal.com/gui/file/1a022d0240a252df61e043a2a17a0a41da0dfb94c3e3de8d0a9f4d411559cfa3/behavior/SecneurX exploits Office’s legacy equation editor to download a remote artifact and execute it



We welcome this new addition to VirusTotal, SecneurX will help put the spotlight on malware. Happy hunting.

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Monitoring malware abusing CVE-2020-1599

CVE-2020-1599 is a vulnerability that can be abused by adding data (that will be later executed) to the signature section of a file, for instance appending a VB script. Unfortunately, Microsoft signature chain certification will not detect that the signature was modified and accept the file as legitimately signed, which can be used to avoid security checks. This is all described in this blog post by our colleagues at Checkpoint, also explaining how ZLoader is using this technique for persistence in recent campaigns.

A non-malicious file abusing this technique can be found here. The file is not malicious per se, as it simply opens the calc.exe utility.

This malicious technique can be mitigated as described here. 

In order to monitor any additional malware abusing this vulnerability, we decided to create a YARA and run a VirusTotal Livehunt, so we will get notified any time a new suspicious file shows up in VirusTotal:

import "pe"
import "vt"

rule CVE-2020-1599_suspicious_signed {

meta:
      author = "@fcojsantos"
      created = "2022.01.07"
      reference = "https://research.checkpoint.com/2022/can-you-trust-a-files-digital-signature-new-zloader-campaign-exploits-microsofts-signature-verification-putting-users-at-risk/"

strings:
      $script = "<script" nocase
      $script2 = "language" nocase
      $script3 = "vbscript" nocase

condition:
      pe.is_pe
      and pe.number_of_signatures > 0
      and not for all i in (0..pe.number_of_signatures - 1): (
            pe.signatures[i].valid_on(pe.timestamp)

      )
// Searches for script literal from the signature offset on
      and $script in (pe.data_directories[pe.IMAGE_DIRECTORY_ENTRY_SECURITY].virtual_address..filesize)
      and $script2 in (pe.data_directories[pe.IMAGE_DIRECTORY_ENTRY_SECURITY].virtual_address..filesize)
      and $script3 in (pe.data_directories[pe.IMAGE_DIRECTORY_ENTRY_SECURITY].virtual_address..filesize)
      and for any tag in vt.metadata.tags : ( tag == "signed" )
}

This YARA searches for suspicious script-related strings appended to the signature. However, YARA cannot check the certificate chain that confirms if the signature itself is valid or not, it only checks that the certificate exists. And here is where the YARA’s vt module comes to the rescue.

In this case, the last condition ‘for any tag in vt.metadata.tags : ( tag == "signed" )’ will check that there exists at least one “signed” tag for the file, meaning that Microsoft Windows WinVerifyTrust function confirms this is a fully valid signature (it is not, as it abuses CVE-2020-1599).

Now, armed with this, we can find several interesting samples abusing this vulnerability that we added to a VT collection.

Additionally, we were interested in understanding how these files were distributed. We created a small graph to visualize any distribution vectors:

In addition to teamworks455[.]com (already listed as malicious in Checkpoint’s blog post), we found commandaadmin[.]com distributing similar malware. You can monitor any malware distributed in the wild by these domains with the following VT intelligence query:

entity:file (itw:commandaadmin or itw:teamworks455)

This query returns some of the indicators already published by Checkpoint plus a few new ones that might be interesting to take a look at.

We hope this post will be useful to understand how we can quickly monitor and do some hunting every time attackers use new techniques. Happy hunting!

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VT Collections Swiss army knife

Since we announced VirusTotal Collections we are really grateful for the warm adoption we received from the VirusTotal community (please remember to help us gather your feedback using the following form). Indeed, we already observed very interesting content leveraging the potential of collection, like the LOG4SHELL: potential IOC collection by our colleague Jesus Toledano.

Several users contacted us interested in learning an easy way to create a collection using the command line. We just implemented this functionality in our vt-cli utility. In case you are not familiar with it, vt-cli is one of our command line tools and it supports many of the features available in the GUI. Back to creating our collection with the command line, you can use something like:

cat ioc-list.txt | vt-cli collection create -n “Collection Name” -

Vt-cli can also assist you to get relevant information from any existing collection. In the example you can find in the video below, we create a collection starting from two suspicious IP addresses and we later get the last analysis stats from them:

Not only that, we already implemented this functionality for you and you can find it ready to use in the following links both for Python and Go.

Finally, keep in mind there is a fully documented REST API that you can use in the same way you use the rest of VirusTotal APIs.

Happy hunting!

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VirusTotal += Vir.IT

We welcome the Vir.IT eXplorer PRO by TG Soft to VirusTotal. In the words of the company:

"TG Soft is an Italian cyber-security company. Since 1992, TG Soft has been analyzing computer viruses and malware both in order to understand how malware operates and to develop software to identify, remove and provide real-time anti-malware protection. TG Soft’s VirIT eXplorer PRO AntiVirus suite is designed for Microsoft Windows operating systems. Since 2015 VirIT eXplorer PRO suite includes Anti-Ransomware technologies to block unknown ransomware attacks by advanced behavioural and heuristic monitoring. TG Soft through its C.R.A.M. (Anti-Malware Research Centre) collects, classifies, analyzes and recognizes today’s malware families and threats."

Vir.IT has expressed its commitment to follow the recommendations of AMTSO and, in compliance with our policy, facilitates this Anti-Malware Certification Testing Report by ICSA Labs.

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Introducing VirusTotal Collections

TL;DR: Threat researchers use Pastebin and similar sites to share sets of IoCs among themselves. We believe there is a more actionable and contextualized way to perform this task, enter VirusTotal Collections. Help us shape the future of IoC collections with the what’s next form.

Collective knowledge is key for the success of us all in the industry. For this reason, we paved the way to give a voice to our community by providing them the mechanisms to (annotate and share) comments on VT observables. Time evolves and now most investigations go beyond one observable, quickly adding up several indicators of compromise (IOCs) for one single incident . With many security researchers sharing their findings in blog posts and tweets, it’s getting hard to keep track of all these data inputs. Moreover, these investigations change over time bringing more difficulty into reporting the new findings. 

To fill that gap, today, we are releasing VirusTotal Collections. A collection is a live report which contains a title, a group of IoCs (file hashes, URLs, domains and IP addresses) and an optional description. Collections are open to our VirusTotal Community (registered users) and they will be enhanced with VirusTotal analysis metadata providing the latest information we have for the IoCs, along with some aggregated tags. 

Collection owners can update these by adding or removing IoCs. They are public via our UI and API, and they can be shared using their permalink. This makes it a very convenient way of linking to listings of IoCs in blog posts, research reports and the like.

All our community generated content, including comments, graphs and collections will contribute to the Community section of file, URL, domain and IP address reports. This means that if a security researcher creates a Collection with a file in it, if you visit the file report you will see the collection in the community section.

You can create IoC collections in the VirusTotal home page, under the SEARCH tab.

Let’s take collaboration one step forward, we hope you enjoy it and we invite you to shape the future of this new functionality in our what’s next form.

Happy Hunting!

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