Sigma rule: WannaCry Ransomware Activity

Rule

Title

WannaCry Ransomware Activity

Status

test

Level

critical

Author

Florian Roth (Nextron Systems), Tom U. @c_APT_ure (collection), oscd.community, Jonhnathan Ribeiro

Date

2019-01-16

Modified

2025-10-18

File

rules-emerging-threats/2017/Malware/WannaCry/proc_creation_win_malware_wannacry.yml

Commit

ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects WannaCry ransomware activity

Log source

product

windows

category

process_creation

Detection

selection_img:
    - Image|endswith:
          - '\tasksche.exe'
          - '\mssecsvc.exe'
          - '\taskdl.exe'
          - '\taskhsvc.exe'
          - '\taskse.exe'
          - '\111.exe'
          - '\lhdfrgui.exe'
          # - '\diskpart.exe'  # cannot be used in a rule of level critical
          - '\linuxnew.exe'
          - '\wannacry.exe'
    - Image|contains: 'WanaDecryptor'
selection_cmd:
    CommandLine|contains: '@[email protected]'
condition: 1 of selection_*

False positives (as the rule lists them)

• Unknown

Tags

• attack.lateral-movement
• attack.defense-impairment
• attack.t1210
• attack.discovery
• attack.t1083
• attack.t1222.001
• attack.impact
• attack.t1486
• attack.t1490
• detection.emerging-threats

MITRE ATT&CK ids this rule names

• T1083
• T1210
• T1222.001
• T1486
• T1490

References

• https://www.hybrid-analysis.com/sample/ed01ebfbc9eb5bbea545af4d01bf5f1071661840480439c6e5babe8e080e41aa?environmentId=100
• https://x.com/nas_bench/status/1868639048484425963

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/2017/Malware/WannaCry/proc_creation_win_malware_wannacry.yml