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Windows LSASS memory access from TrolleyExpress/ProcessDump/dump64 processes

Alerts on Windows processes attempting to access lsass.exe from TrolleyExpress.exe, ProcessDump.exe, or dump64.exe with dump-like access rights.

FreeReviewedSigma · High · v2
Product
windows
Category
process_access
Author
Florian Roth (Nextron Systems) (SigmaHQ), DRL 1.1
Published
2022-02-10
Updated
2026-07-31
AnalysisDetection

ATT&CK techniques

Cred Access

  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. Collection

  12. C2

  13. Exfiltration

  14. Impact

What it detects

This rule flags Windows process access events where a non-whitelisted process attempts to access lsass.exe, specifically when the source image ends with TrolleyExpress.exe, ProcessDump.exe, or dump64.exe. The granted access values matched indicate permissions consistent with reading sensitive process memory, a common step in credential dumping. It relies on process access telemetry that includes TargetImage, SourceImage, and GrantedAccess attributes.

Reporting behind it

Related detections9 linkedT1003.001 — drag to rearrange
Malicious WDigest Credential Caching Enabled via Registry (via registry_set)
Malicious Credential Dumping via Mimikatz Sekurlsa Command
Malicious Mimikatz Sekurlsa Logonpasswords Credential Dump
Malicious LSASS Credential Dump via ProcDump (via process_creation)
Malicious LSASS Memory Dump via comsvcs.dll by Salt Typhoon
Malicious LSASS Dump via Process Access (via process_access)
Malicious LSASS Credential Dump with LSASSY - Process (via process_creation)
Malicious LSASS Credential Dump with LSASSY - Admin Share (via security)
Malicious Task Manager Used for LSASS Dump - Kernel (via security)
Windows LSASS memory access from TrolleyExpress/ProcessDump/dump64 processes
Pivot detection · T1003.001 · 9 related

Changelog

v2
  1. v2
    Candidate ingested via manual entry.2026-07-31
  2. v1
    No changelog recorded for this version.2026-07-30

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