Description of Campaign
The BluStealer malware, first identified in early 2021, has resurfaced with additional features and evasion techniques. The malware is based on code reuse from the SpyEx project and appears to be continually maintained and updated. Recent modifications continue to use process hollowing, but partly change the API calls to a direct syscall. This evasion technique is thought to confuse and bypass security checks performed by security products. In addition to detection evasion techniques, BluStealer has added more web browsers that it can steal credentials from and crypto wallets that it can steal keys from.

Our ATR Team gathers and analyzes information from multiple open and closed sources before disseminating intelligence reports. This campaign was researched by Minerva Labs and shared publicly.

How to use this article:

1. If a Threat Hunting table has been created, use the rules contained to search for malware related to this campaign. 
2. 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.
3. Scroll down and review the "Product Countermeasures" section of this article. Consider implementing them if they are not already in place.
4. Review KB91836 - Countermeasures for entry vector threats.
5. Review KB87843 - Dynamic Application Containment rules and best practices.
6. 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's being tracked. The list of IOCs will change over time; check Trellix Insights for the latest IOCs.
 
Campaign IOC

Type	Value
SHA256	B1B617A8548FFC045B300542B71FBF05496D6C7EEF5E1FFDF66A596B012667AE
SHA256	06593A15859C04C2462B7C6A5C67ECE434466CCF6C7386C4D360612654D9BCEC

Minimum Content Versions

Content Type	Version
V2 DAT (VirusScan Enterprise)	10358
V3 DAT (Endpoint Security)	4810

  
Detection Summary                               

IOC	Scanner	Detection
B1B617A8548FFC045B300542B71FBF05496D6C7EEF5E1FFDF66A596B012667AE	AVEngine V2	Trojan-pws.n
	AVEngine V3	Trojan-pws.n
	JTI (ATP Rules)	JTI/Suspect.196612!953b2013a8b0
	RP Static	-
	RP Dynamic	-

 

IOC	Scanner	Detection
06593A15859C04C2462B7C6A5C67ECE434466CCF6C7386C4D360612654D9BCEC	AVEngine V2	GenericRXSS-GS!790F4DA318B3
	AVEngine V3	GenericRXSS-GS!790F4DA318B3
	JTI (ATP Rules)	JTI/Suspect.1179887!cda48fc75952
	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:
Host Intrusion Prevention:
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.

VirusScan Enterprise - Access Protection Rules:
Host Intrusion Prevention: