ThreatFox: Taurus Stealer IOCs

Hunt Hypothesis

The detection identifies potential Taurus Stealer activity through known IOCs, indicating an adversary may be exfiltrating data or establishing persistence within the environment. SOC teams should proactively hunt for this behavior to identify and mitigate advanced threats before significant data loss occurs.

IOC Summary

Malware Family: Taurus Stealer Total IOCs: 3 IOC Types: sha256_hash, md5_hash, sha1_hash

KQL: Hash Hunt

// Hunt for files matching known malicious hashes
// Source: ThreatFox - Taurus Stealer
let malicious_hashes = dynamic(["7105e52803914e37050b6f2a4c0d8a8339a2a381", "8368894761e8f296575356fe49978880", "13a1587305880da5fbd956cf9a1353a336996a66735f887004e38ed65b2f7ff1"]);
DeviceFileEvents
| where SHA256 in (malicious_hashes) or SHA1 in (malicious_hashes) or MD5 in (malicious_hashes)
| project Timestamp, DeviceName, FileName, FolderPath, SHA256, InitiatingProcessFileName
| order by Timestamp desc

Required Data Sources

References

• ThreatFox — Taurus Stealer

False Positive Guidance

• Scenario: Legitimate Scheduled Job Execution
  Description: A system administrator schedules a legitimate job using schtasks.exe to run a script that is falsely flagged as Taurus Stealer.
  Filter/Exclusion: Exclude processes initiated by schtasks.exe with known legitimate script paths (e.g., C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe).

• Scenario: Microsoft Defender Antivirus Scan
  Description: Microsoft Defender performs a full system scan using MsMpEng.exe, which may trigger the rule due to its interaction with system files.
  Filter/Exclusion: Exclude processes with the full path C:\Windows\System32\msmpeng.exe or filter based on process parent process being services.exe.

• Scenario: Windows Update or Patching Task
  Description: A Windows Update task using wusa.exe or dism.exe may be flagged due to its interaction with system files or registry keys.
  Filter/Exclusion: Exclude processes with the full path C:\Windows\System32\wusa.exe or C:\Windows\System32\dism.exe.

• Scenario: PowerShell Script for System Monitoring
  Description: A legitimate PowerShell script (e.g., from Microsoft or internal IT tools) is executed using powershell.exe and is flagged due to its use of common Taurus Stealer IOCs.
  Filter/Exclusion: Exclude processes where the command line includes known internal or Microsoft script paths (e.g., C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe -File C:\Tools\monitor.ps1).

• Scenario: Admin Task for Log Collection
  Description: An admin task using logman.exe or wevtutil.exe to collect logs may