Iron Panda Malware

Hunt Hypothesis

The Iron Panda Malware detection rule identifies potential adversary behavior involving suspicious file execution and network communication patterns commonly associated with malware activity. SOC teams should proactively hunt for this behavior in Azure Sentinel to detect and mitigate early-stage threats before they escalate.

YARA Rule

rule IronPanda_Malware1 
{

    meta:
        description = "Iron Panda Malware"
        author = "Florian Roth"
        reference = "https://goo.gl/E4qia9"
        date = "2015-09-16"
        hash = "a0cee5822ddf254c254a5a0b7372c9d2b46b088a254a1208cb32f5fe7eca848a"

    strings:
        $x1 = "activedsimp.dll" fullword wide
        $s1 = "get_BadLoginAddress" fullword ascii
        $s2 = "get_LastFailedLogin" fullword ascii
        $s3 = "ADS_UF_ENCRYPTED_TEXT_PASSWORD_ALLOWED" fullword ascii
        $s4 = "get_PasswordExpirationDate" fullword ascii
   
    condition:
        uint16(0) == 0x5a4d and filesize < 300KB and 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 5 string patterns in its detection logic.

References

• https://goo.gl/E4qia9
• Source Rule

False Positive Guidance

• Scenario: System Maintenance Scheduled Task
  Description: A legitimate scheduled task runs a script that mimics Iron Panda’s behavior, such as downloading files or modifying registry keys.
  Filter/Exclusion: process.parent_process == "Task Scheduler" or process.name == "schtasks.exe"

• Scenario: Software Update Deployment
  Description: A patching tool like Microsoft Endpoint Configuration Manager (MECM) or SCCM deploys updates that involve file modifications or registry changes.
  Filter/Exclusion: process.name == "msiexec.exe" or process.name == "setup.exe" with known update hashes

• Scenario: Admin User Performing System Cleanup
  Description: An admin user uses tools like cleanmgr.exe or diskcleanup.exe to remove temporary files, which may trigger file deletion alerts.
  Filter/Exclusion: process.name == "cleanmgr.exe" or process.name == "diskcleanup.exe"

• Scenario: Log File Rotation by Log Management Tool
  Description: A log management tool like Splunk or ELK Stack rotates log files, which may be mistaken for malware activity.
  Filter/Exclusion: process.name == "splunkd.exe" or process.name == "logrotate.exe" with known log rotation patterns

• Scenario: Antivirus Quarantine Process
  Description: An antivirus tool like Bitdefender or Kaspersky quarantines files, which may be flagged as suspicious activity.
  Filter/Exclusion: process.name == "bitdefender.exe" or process.name == "kavservice.exe" with known quarantine processes