Blackbyte Ransomware Registry

Oct 23, 2025 · attack.persistence attack.defense-evasion attack.t1112 detection.emerging-threats ·

Detects specific windows registry modifications made by BlackByte ransomware variants. BlackByte set three different registry values to escalate privileges and begin setting the stage for lateral movement and encryption. This rule triggers when any of the following registry keys are set to DWORD 1, however all three should be investigated as part of a larger BlackByte ransomware detection and response effort.

Sigma rule (View on GitHub)

 1title: Blackbyte Ransomware Registry
 2id: 83314318-052a-4c90-a1ad-660ece38d276
 3status: test
 4description: |
 5    Detects specific windows registry modifications made by BlackByte ransomware variants.
 6    BlackByte set three different registry values to escalate privileges and begin setting the stage for lateral movement and encryption.
 7    This rule triggers when any of the following registry keys are set to DWORD 1, however all three should be investigated as part of a larger BlackByte ransomware detection and response effort.    
 8references:
 9    - https://redcanary.com/blog/blackbyte-ransomware/?utm_source=twitter&utm_medium=social
10    - https://www.trustwave.com/en-us/resources/blogs/spiderlabs-blog/blackbyte-ransomware-pt-1-in-depth-analysis/
11author: frack113
12date: 2022-01-24
13modified: 2025-10-21
14tags:
15    - attack.persistence
16    - attack.defense-evasion
17    - attack.t1112
18    - detection.emerging-threats
19logsource:
20    category: registry_set
21    product: windows
22detection:
23    selection:
24        TargetObject:
25            - 'HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\LocalAccountTokenFilterPolicy'
26            - 'HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLinkedConnections'
27            - 'HKLM\SYSTEM\CurrentControlSet\Control\FileSystem\LongPathsEnabled'
28        Details: 'DWORD (0x00000001)'
29    condition: selection
30falsepositives:
31    - Unknown
32level: high

References

ProxyShell exploitation leads to BlackByte ransomware | Red Canary

BlackByte ransomware leverages ProxyShell Microsoft Exchange vulnerabilities for initial access and Cobalt Strike for lateral movement.

Read More
BlackByte Ransomware – Pt. 1 In-depth Analysis | Trustwave

During a recent malware incident response case, we encountered an interesting piece of ransomware that goes by the name of BlackByte.

Read More

Blackbyte Ransomware Registry

Sigma rule (View on GitHub)

References

ProxyShell exploitation leads to BlackByte ransomware | Red Canary

BlackByte Ransomware – Pt. 1 In-depth Analysis | Trustwave

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