marcher

Hunt Hypothesis

The marcher YARA rule detects potential malicious artifacts associated with the Marcher malware family, which is known for targeting financial institutions. SOC teams should proactively hunt for this behavior in Azure Sentinel to identify and mitigate early-stage compromises that may evade traditional detection methods.

YARA Rule

rule marcher: amtrckr
{
	meta:
		family = "marcher"

	condition:
		androguard.url(/104\.238\.176\.9/) or 
		androguard.url(/golioni\.tk/) or 
		androguard.url(/poloclubs\.tk/) or 
		androguard.url(/thejcb\.ru/) or 
		androguard.url(/shgt\.tk/) or 
		androguard.url(/pologt\.tk/) or 
		androguard.url(/108\.61\.211\.219/) or 
		androguard.url(/vipcoon\.com/) or 
		androguard.url(/firenzonne\.com/) or 
		androguard.url(/extgta\.tk/) or 
		androguard.url(/manaclubs\.tk/) or 
		androguard.url(/151\.248\.126\.183/) or 
		androguard.url(/188\.209\.49\.198/)
}

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
• Source Rule

False Positive Guidance

• Scenario: Scheduled System Maintenance Task
  Description: A legitimate system maintenance task (e.g., task scheduler or cron job) is running and triggering the YARA rule due to matching strings in log files or scripts.
  Filter/Exclusion: Check for task scheduler or cron in the process name or command line arguments. Example filter: process.name : "task scheduler" or process.name : "cron".

• Scenario: Log File Rotation or Archive Process
  Description: A log rotation tool like logrotate or a script using gzip is compressing log files, and the YARA rule is matching the compression utility strings.
  Filter/Exclusion: Filter by process.name : "gzip" or process.name : "logrotate".

• Scenario: Admin Performing Disk Cleanup or File Compression
  Description: An administrator is using cleanmgr.exe or compact.exe to clean up or compress files, which may trigger the rule due to similar string patterns.
  Filter/Exclusion: Filter by process.name : "cleanmgr.exe" or process.name : "compact.exe".

• Scenario: Antivirus or Endpoint Protection Scanning
  Description: A legitimate antivirus tool like Windows Defender or Bitdefender is scanning files, and its internal processes or logs match the YARA rule.
  Filter/Exclusion: Filter by process.name : "Windows Defender" or process.name : "bitdefender".

• Scenario: Database Backup or Restore Job
  Description: A database backup tool like mysqldump or pg_dump is running, and the YARA rule is matching strings related to data export/import.
  Filter/Exclusion: Filter by process.name : "mysqldump" or `process