Sigma rule: Operation Wocao Activity - Security
A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-9d35d7427784, updated 2022-11-27T00:00:00.000Z.
Rule
- Title
- Operation Wocao Activity - Security
- Status
- test
- Level
- high
- Author
- Florian Roth (Nextron Systems), frack113
- Date
- 2019-12-20
- Modified
- 2022-11-27
- File
- rules-emerging-threats/2019/TA/Operation-Wocao/win_security_apt_wocao.yml
- Commit
- ccbb0369507f796db0b0ae6854c8a2be471b9d84
Detects activity mentioned in Operation Wocao report
Log source
- product
- windows
- service
- security
Detection
selection:
EventID: 4799
TargetUserName|startswith: 'Administr'
CallerProcessName|endswith: '\checkadmin.exe'
condition: selectionFalse positives (as the rule lists them)
- Administrators that use checkadmin.exe tool to enumerate local administrators
Tags
- attack.privilege-escalation
- attack.persistence
- attack.discovery
- attack.stealth
- attack.t1012
- attack.t1036.004
- attack.t1027
- attack.execution
- attack.t1053.005
- attack.t1059.001
- detection.emerging-threats
MITRE ATT&CK ids this rule names
References
- https://web.archive.org/web/20200226212615/https://www.fox-it.com/en/news/whitepapers/operation-wocao-shining-a-light-on-one-of-chinas-hidden-hacking-groups/
- https://web.archive.org/web/20200226212615/https://resources.fox-it.com/rs/170-CAK-271/images/201912_Report_Operation_Wocao.pdf
- https://twitter.com/SBousseaden/status/1207671369963646976
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/2019/TA/Operation-Wocao/win_security_apt_wocao.yml
Sources and licences
SigmaHQ
"Operation Wocao Activity - Security" by Florian Roth (Nextron Systems), frack113 (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules-emerging-threats/2019/TA/Operation-Wocao/win_security_apt_wocao.yml.
Licensed under the Detection Rule License (DRL) 1.1: https://github.com/SigmaHQ/Detection-Rule-License
Cite this page
Dragons Eye Ransomware Tracker, "Sigma rule: Operation Wocao Activity - Security",
entity page, dataset version ref-9d35d7427784, updated 2022-11-27T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/74ad4314-482e-4c3e-b237-3f7ed3b9ca8d (accessed 2026-11-03).
Underlying source: SigmaHQ rule 74ad4314-482e-4c3e-b237-3f7ed3b9ca8d, 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.