Antivirus ransomware signature match (Babuk, Lockbit, Ryuk, WannaCry)
Flags antivirus ransomware detections when the alert signature contains known ransomware family name strings.
FreeReviewedSigma · Critical · v5
- Category
- antivirus
- Author
- Florian Roth (Nextron Systems), Arnim Rupp (SigmaHQ), DRL 1.1
- Published
- 2022-05-12
- Updated
- 2026-07-31
ATT&CK techniques
ImpactRecon
Resource Dev
Initial Access
Execution
Persistence
Priv Esc
Defense Evasion
Cred Access
Discovery
Lateral Movement
Collection
C2
Exfiltration
What it detects
This rule flags Antivirus alerts whose signature name contains common ransomware family or indicator strings such as Babuk, Lockbit, Ryuk, and WannaCry. Even when the AV blocked the malware, these detections matter because they indicate a likely ransomware payload attempt occurred and should be investigated for initial access and execution context. Telemetry relies on Antivirus alert metadata, specifically the Signature field content matching the listed ransomware-related substrings.
Reporting behind it
- nextron-systems.comhttps://www.nextron-systems.com/?s=antivirus
- virustotal.comhttps://www.virustotal.com/gui/file/43b0f7872900bd234975a0877744554f4f355dc57505517abd1ef611e1ce6916
- virustotal.comhttps://www.virustotal.com/gui/file/c312c05ddbd227cbb08958876df2b69d0f7c1b09e5689eb9d93c5b357f63eff7
- virustotal.comhttps://www.virustotal.com/gui/file/20179093c59bca3acc6ce9a4281e8462f577ffd29fd7bf51cf2a70d106062045
- virustotal.comhttps://www.virustotal.com/gui/file/554db97ea82f17eba516e6a6fdb9dc04b1d25580a1eb8cb755eeb260ad0bd61d
- virustotal.comhttps://www.virustotal.com/gui/file/69fe77dd558e281621418980040e2af89a2547d377d0f2875502005ce22bc95c
- virustotal.comhttps://www.virustotal.com/gui/file/6f0f20da34396166df352bf301b3c59ef42b0bc67f52af3d541b0161c47ede05
- github.comhttps://github.com/SigmaHQ/sigma/blob/master/rules/category/antivirus/av_ransomware.yml
Changelog
v5- v5Candidate ingested via manual entry.2026-07-31
- v4Candidate ingested via manual entry.2026-07-31
- v3Candidate ingested via manual entry.2026-07-31
- v2Candidate ingested via manual entry.2026-07-31
- v1No 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.
antivirus-ransomware-signature-alert-based-on-known-family-name-strings-4c6ca276
title: Antivirus ransomware signature match (Babuk, Lockbit, Ryuk, WannaCry)
id: 7825641c-17c2-47ed-ba9f-9517bb897321
status: test
description: This rule flags Antivirus alerts whose signature name contains common ransomware family or indicator strings such as Babuk, Lockbit, Ryuk, and WannaCry. Even when the AV blocked the malware, these detections matter because they indicate a likely ransomware payload attempt occurred and should be investigated for initial access and execution context. Telemetry relies on Antivirus alert metadata, specifically the Signature field content matching the listed ransomware-related substrings.
references:
- https://www.nextron-systems.com/?s=antivirus
- https://www.virustotal.com/gui/file/43b0f7872900bd234975a0877744554f4f355dc57505517abd1ef611e1ce6916
- https://www.virustotal.com/gui/file/c312c05ddbd227cbb08958876df2b69d0f7c1b09e5689eb9d93c5b357f63eff7
- https://www.virustotal.com/gui/file/20179093c59bca3acc6ce9a4281e8462f577ffd29fd7bf51cf2a70d106062045
- https://www.virustotal.com/gui/file/554db97ea82f17eba516e6a6fdb9dc04b1d25580a1eb8cb755eeb260ad0bd61d
- https://www.virustotal.com/gui/file/69fe77dd558e281621418980040e2af89a2547d377d0f2875502005ce22bc95c
- https://www.virustotal.com/gui/file/6f0f20da34396166df352bf301b3c59ef42b0bc67f52af3d541b0161c47ede05
- https://github.com/SigmaHQ/sigma/blob/master/rules/category/antivirus/av_ransomware.yml
author: Florian Roth (Nextron Systems), Arnim Rupp, Huntrule Team
date: 2022-05-12
modified: 2026-06-15
tags:
- attack.t1486
- attack.impact
logsource:
category: antivirus
detection:
selection:
Signature|contains:
- Babuk
- Babyk
- BlackWorm
- Chaos
- Cobra
- ContiCrypt
- Crypter
- Cryptes
- Cryptor
- CylanCrypt
- DelShad
- Destructor
- Filecoder
- GandCrab
- GrandCrab
- Haperlock
- Hiddentear
- HydraCrypt
- Krypt
- Lockbit
- Locker
- Mallox
- Medusa
- Phobos
- Ransom
- Rook
- Ryuk
- Ryzerlo
- Stopcrypt
- Tescrypt
- TeslaCrypt
- WannaCry
- Xorist
condition: selection
falsepositives:
- Unlikely
level: critical
license: DRL-1.1
related:
- id: 4c6ca276-d4d0-4a8c-9e4c-d69832f8671f
type: derived