Description of Campaign
In several BlackMatter ransomware cases, the threat actor launched a specially developed data exfiltration tool called ExMatter. This tool is designed to scan and steal specific file types from a number of selected locations. Exfiltration often happens prior to the deployment of ransomware in the victims' network.
The McAfee Enterprise ATR Team gathers and analyzes information from multiple open and closed sources before disseminating intelligence reports. This campaign was researched by Symantec and shared publicly here.
How to use this article:
- If a Threat Hunting table has been created, use the rules contained to search for malware related to this campaign.
- Review the product detection table and confirm that your environment is at least on the specified content version.
To download the latest content versions, go to the Security Updates page.
- Scroll down and review the "Product Countermeasures" section of this article. Consider implementing them if they are not already in place.
- Review KB91836 - Countermeasures for entry vector threats.
- Review KB87843 - Dynamic Application Containment rules and best practices.
- Review KB82925 - Identify what rule corresponds to an Adaptive Threat Protection and Threat Intelligence Exchange event.
This Knowledge Base article discusses a specific threat that is being tracked. The list of IOCs will change over time; check MVISION Insights for the latest IOCs.
Campaign IOC
| Type |
Value |
| SHA256 |
325ECD90CE19DD8D184FFE7DFB01B0DD02A77E9EABCB587F3738BCFBD3F832A1 |
| SHA256 |
B6BC126526E27C98A94AAB16989864161DB1B3A75F18BD5C72BACBDFCCAD7BD7 |
| SHA256 |
8EDED48C166F50BE5AC33BE4B010B09F911FFC155A3AB76821E4FEBD369D17EF |
| IP-DST |
157.230.28.192 |
| IP-DST |
159.89.128.13 |
| IP-DST |
165.22.84.147 |
Minimum Content Versions:
| Content Type |
Version |
| V2 DAT (VirusScan Enterprise) |
10158 |
| V3 DAT (Endpoint Security) |
4610 |
Detection Summary
| IOC |
Scanner |
Detection |
| 325ECD90CE19DD8D184FFE7DFB01B0DD02A77E9EABCB587F3738BCFBD3F832A1 |
AVEngine V2 |
Ransom-BlackMatter.a |
| AVEngine V3 |
Ransom-BlackMatter.a |
| JTI (ATP Rules) |
JTI/Suspect.196612!d3c5b425a0e3 |
| RP Static |
- |
| RP Dynamic |
- |
| IOC |
Scanner |
Detection |
| B6BC126526E27C98A94AAB16989864161DB1B3A75F18BD5C72BACBDFCCAD7BD7 |
AVEngine V2 |
Trojan-ExMatter |
| AVEngine V3 |
Trojan-ExMatter |
| JTI (ATP Rules) |
JTI/Suspect.196612!d3c5b425a0e3 |
| RP Static |
- |
| RP Dynamic |
- |
| IOC |
Scanner |
Detection |
| 8EDED48C166F50BE5AC33BE4B010B09F911FFC155A3AB76821E4FEBD369D17EF |
AVEngine V2 |
Trojan-ExMatter |
| AVEngine V3 |
Trojan-ExMatter |
| JTI (ATP Rules) |
JTI/Suspect.196612!d3c5b425a0e3 |
| RP Static |
- |
| RP Dynamic |
- |
Minimum set of Manual Rules to improve protection to block this campaign
IMPORTANT: Always follow best practices when you enable new rules and signatures.
When you implement new rules or signatures, always set them to Report mode first and check the alerts generated. Resolve any issues that arise and then set the rules to Block. This step mitigates against triggering false positives and allows you to refine your configuration.
For more information, see KB87843 - List of and best practices for Endpoint Security Dynamic Application Containment rules.
Endpoint Security - Advanced Threat Protection:
Rule ID: 4 Use GTI file reputation to identify trusted or malicious files
Aggressive set of Manual Rules to improve protection to block this campaign
IMPORTANT: Always follow best practices when you enable new rules and signatures.
When you implement new rules or signatures, always set them to Report mode first and check the alerts generated. Resolve any issues that arise and then set the rules to Block. This step mitigates against triggering false positives and allows you to refine your configuration.
For more information, see KB87843 - List of and best practices for Endpoint Security Dynamic Application Containment rules.
Host Intrusion Prevention:
Rule ID: 1020 Windows Agent Shielding - File Access
Rule ID: 6011 Generic Application Invocation Protection
Rule ID: 6010 Generic Application Hooking Protection
Rule ID: 1148 CMD Tool Access by a Network Aware Application
