Sigma rule: APT PRIVATELOG Image Load Pattern

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-5516263a3f15, updated 2022-10-09T00:00:00.000Z.

Rule

Title
APT PRIVATELOG Image Load Pattern
Status
test
Level
high
Author
Florian Roth (Nextron Systems)
Date
2021-09-07
Modified
2022-10-09
File
rules-emerging-threats/2021/TA/PRIVATELOG/image_load_usp_svchost_clfsw32.yml
Commit
ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects an image load pattern as seen when a tool named PRIVATELOG is used and rarely observed under legitimate circumstances

Log source

product
windows
category
image_load

Detection

selection:
    Image|endswith: '\svchost.exe'
    ImageLoaded|endswith: '\clfsw32.dll'
condition: selection

False positives (as the rule lists them)

  • Rarely observed

Tags

  • attack.privilege-escalation
  • attack.stealth
  • attack.t1055
  • detection.emerging-threats

MITRE ATT&CK ids this rule names

References

Read on 2026-11-03T00:58:21.399Z under licence sigma-drl-1.1@d5f4c36a from https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules-emerging-threats/2021/TA/PRIVATELOG/image_load_usp_svchost_clfsw32.yml

Sources and licences

  • SigmaHQ

    "APT PRIVATELOG Image Load Pattern" by Florian Roth (Nextron Systems) (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules-emerging-threats/2021/TA/PRIVATELOG/image_load_usp_svchost_clfsw32.yml.
    Licensed under the Detection Rule License (DRL) 1.1: https://github.com/SigmaHQ/Detection-Rule-License

    Detection Rule License (DRL) 1.1

Cite this page

Dragons Eye Ransomware Tracker, "Sigma rule: APT PRIVATELOG Image Load Pattern",
entity page, dataset version ref-5516263a3f15, updated 2022-10-09T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/33a2d1dd-f3b0-40bd-8baf-7974468927cc (accessed 2026-11-03).
Underlying source: SigmaHQ rule 33a2d1dd-f3b0-40bd-8baf-7974468927cc, commit ccbb0369507f796db0b0ae6854c8a2be471b9d84.

Pages change. The dataset version identifies the data, but no archive of old versions is kept, so this citation cannot be replayed later.