EQGRP Toolset Firewall - from files eligiblebombshell_1.2.0.1.py, eligiblebombshell_1.2.0.1.py

Hunt Hypothesis

The detection identifies potential adversary use of the EQGRP Toolset Firewall module through suspicious Python files, indicating possible network traffic manipulation or firewall evasion. SOC teams should proactively hunt for this behavior to uncover covert network activity and mitigate advanced persistent threat (APT) operations leveraging compromised infrastructure.

YARA Rule

rule EQGRP_eligiblebombshell_generic 
{

    meta:
        description = "EQGRP Toolset Firewall - from files eligiblebombshell_1.2.0.1.py, eligiblebombshell_1.2.0.1.py"
        author = "Florian Roth"
        reference = "Research"
        date = "2016-08-16"
        super_rule = 1
        hash1 = "dd0e3ae6e1039a755bf6cb28bf726b4d6ab4a1da2392ba66d114a43a55491eb1"
        hash2 = "dd0e3ae6e1039a755bf6cb28bf726b4d6ab4a1da2392ba66d114a43a55491eb1"
  
    strings:
        $s1 = "logging.error(\"       Perhaps you should run with --scan?\")" fullword ascii
        $s2 = "logging.error(\"ERROR: No entry for ETag [%s] in %s.\" %" fullword ascii
        $s3 = "\"be supplied\")" fullword ascii
  
    condition:
        ( filesize < 70KB and 2 of ($s*) ) or ( all of them )
}

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 3 string patterns in its detection logic.

References

• Research
• Source Rule

False Positive Guidance

• Scenario: Legitimate Python Script Execution
  Description: A system administrator is running a legitimate Python script named eligiblebombshell_1.2.0.1.py as part of a scheduled maintenance task.
  Filter/Exclusion: process.name != "eligiblebombshell_1.2.0.1.py" OR process.parent.name == "task scheduler" OR process.user == "admin"

• Scenario: Development Environment Testing
  Description: A developer is testing a script named eligiblebombshell_1.2.0.1.py in a development environment, which is not part of the production network.
  Filter/Exclusion: destination.ip != "production_network_range" OR process.directory contains "dev_env" OR process.user == "dev_user"

• Scenario: Scheduled Job for Log Analysis
  Description: A scheduled job runs a script named eligiblebombshell_1.2.0.1.py to analyze firewall logs as part of a security monitoring process.
  Filter/Exclusion: process.name contains "log_analysis" OR process.parent.name == "schtasks" OR process.directory contains "log_processing"

• Scenario: Third-Party Tool Integration
  Description: A third-party tool, such as ELK Stack, is using a script named eligiblebombshell_1.2.0.1.py to process firewall data.
  Filter/Exclusion: process.name contains "elasticsearch" OR process.parent.name contains "logstash" OR process.directory contains "elk_tools"

• Scenario: Code Signing and Deployment Process
  Description: A deployment pipeline is using a script named eligiblebombshell_1.2.0.1.py to deploy code to a firewall, which is part of an automated CI/CD process.