CDSSSv10Beta1CyberDoomTeamX

Hunt Hypothesis

This hypothesis targets the presence of the CyberDoom Team X malware signature, which indicates a potential low-severity intrusion or staging activity within the environment. Proactively hunting for this specific YARA pattern allows the SOC to identify compromised hosts or dormant implants early, ensuring rapid containment before the adversary can escalate privileges or establish persistent access.

YARA Rule

rule CDSSSv10Beta1CyberDoomTeamX
{
      meta:
		author="malware-lu"
strings:
		$a0 = { 60 E8 00 00 00 00 5D 81 ED CA 47 40 00 FF 74 24 20 E8 D3 03 00 00 0B C0 0F 84 13 03 00 00 89 85 B8 4E 40 00 66 8C D8 A8 04 74 0C C7 85 8C 4E 40 00 01 00 00 00 EB 12 64 A1 30 00 00 00 0F B6 40 02 0A C0 0F 85 E8 02 00 00 8D 85 F6 4C 40 00 50 FF B5 B8 4E 40 00 E8 FC 03 00 00 0B C0 0F 84 CE 02 00 00 E8 1E 03 00 00 89 85 90 4E 40 00 8D 85 03 4D 40 00 50 FF B5 B8 }

condition:
		$a0 at pe.entry_point
}

Deployment Notes

This YARA rule can be deployed in the following contexts:

• Microsoft Defender for Endpoint — Custom indicators / advanced hunting
• Email Gateway — Attachment scanning
• File Share Monitoring — Periodic scanning of shared drives
• YARA CLI — Manual threat hunting on endpoints

This rule contains 1 string patterns in its detection logic.

• Source Rule

False Positive Guidance

• Scenario: A developer or DevOps engineer runs a local build pipeline or containerized CI/CD agent (e.g., Jenkins, GitLab Runner, or Azure DevOps) that compiles or packages a legacy C/C++ application. The resulting binary or intermediate object file may contain specific string patterns or structural artifacts that match the YARA rule’s signature for the “CyberDoomTeamX” module, especially if the rule targets common library headers or version strings.

  • Filter/Exclusion: Exclude processes originating from known build tools (e.g., msbuild.exe, dotnet.exe, dockerd.exe, jenkins-agent.jar) or files located in standard build directories (e.g., C:\builds\, /tmp/build/, node_modules/).

• Scenario: An administrator performs a routine patching or deployment task using a configuration management tool like Ansible, Puppet, or Chef. These tools often download and execute small helper scripts or binaries (e.g., ansible-playbook, puppet-agent) that may embed specific version identifiers or cryptographic keys matching the rule’s conditions, particularly if the rule inspects memory or file headers for specific team identifiers or beta tags.

  • Filter/Exclusion: Exclude processes with parent processes known to be configuration management agents (e.g., ansible-playbook.exe, puppet-agent.exe, chef-client.exe) or exclude files with specific extensions (.py, .rb, .gem) located in standard configuration management directories (e.g., C:\ProgramData\Ansible\, /etc/puppet/).

• Scenario: A security team or QA engineer runs a scheduled vulnerability scan or integrity check using tools like Qualys, Tenable, or custom PowerShell scripts. These tools may load shared libraries or execute small probe binaries that contain the specific “CDSSSv10Beta1” string or