Description of Campaign
Threat actors continue to scour the internet looking for unpatched vulnerabilities that may be exploited to gain a foothold on a target infrastructure. As more organizations and individual users rely on public cloud infrastructure to host content and utilize IaaS, SaaS, or PaaS offerings, vulnerabilities are discovered, and malicious programs are written to exploit the vulnerabilities. In the recent past, three vulnerabilities were identified in the Spring Framework; threat actors have been seen hitting honeypots looking to exploit them as researchers collect data points and malware samples from the vulnerable honeypot servers with attacks including brute force attempts and remote code execution.

Our ATR Team gathers and analyzes information from multiple open and closed sources before disseminating intelligence reports. This campaign was researched by Netlab 360 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 MVISION Insights for the latest IOCs.
 
Campaign IOC

Type	Value
SHA256	8204B6E620D1181C31BB8FE8471079836ED09DDACA9C5E6A5E09D7AEC456774E
SHA256	8C434F0B716F0900DD6CF6CB9444C20E88184BF64B8B7149DC70CD65E7ED22A7
URL	http://14.1.98.226:8880/7z
URL	http://51.81.133.90/NWWW.6
URL	http://51.81.133.90/qweasd
URL	http://14.1.98.226:8880/ff.elf

Minimum Content Versions

Content Type	Version
V2 DAT (VirusScan Enterprise)	10281
V3 DAT (Endpoint Security)	4732

  
Detection Summary                               

IOC	Scanner	Detection
8204B6E620D1181C31BB8FE8471079836ED09DDACA9C5E6A5E09D7AEC456774E	AVEngine V2	ELF/Backdoor.c
	AVEngine V3	ELF/Backdoor.c
	JTI (ATP Rules)	-
	RP Static	-
	RP Dynamic	-

 

IOC	Scanner	Detection
8C434F0B716F0900DD6CF6CB9444C20E88184BF64B8B7149DC70CD65E7ED22A7	AVEngine V2	DoS-FAW!392F13B090F5
	AVEngine V3	DoS-FAW!392F13B090F5
	JTI (ATP Rules)	JTI/Suspect.196612!392f13b090f5
	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:
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: