Malicious Empyrean Stealer Staging Files in AppData (via file_event)

PremiumReviewedSigma · High · v1
Product
windows
Category
file_event
Author
HuntRule
Published
2026-09-13
Updated
2026-09-13

ATT&CK techniques

Collection
  1. Recon

  2. Resource Dev

  3. Initial Access

  4. Execution

  5. Persistence

  6. Priv Esc

  7. Defense Evasion

  8. Cred Access

  9. Discovery

  10. Lateral Movement

  11. C2

  12. Exfiltration

  13. Impact

What it detects

This rule detects creation of Empyrean stealer staging files such as run.bat and dat.txt inside an empyrean folder under AppData. The malware writes its batch runner and collected system data to this directory before exfiltration over Discord.

Related detections8 linkedT1074.001 — drag to rearrange
TerraStealerV2 Data Staging in Bay0NsQIzx Package Directory (via file_event)
Suspicious C2Looper Shell Output Artifact File Creation (via file_event)
Malicious Kimsuky Troll Stealer Collected Data Staging Files with gte1 Extension (via file_event)
Suspicious VOLTZITE Single-Character Named ZIP Exfil Staging (via file_event)
PowerShell Classic Compress-Archive staging in TEMP or Temp directories
PowerShell Compress-Archive Creates Archive in Temp or System Temp Paths
PowerShell: Compress-Archive to TEMP/AppData/Windows Temp for Staging
Windows PowerShell module usage: Compress-Archive to store archives in Temp locations
Malicious Empyrean Stealer Staging Files in AppData (via file_event)
Pivot detection · T1074.001 · 8 related

Detection content is published as a reviewed draft. Tune thresholds and exclusions against your own telemetry before enabling this rule for alerting.