Suspicious Registry Key Added: LanmanServer Parameters

 1title: 'Suspicious Registry Key Added: LanmanServer Parameters'
 2id: 9c5df39b-0fe2-450b-bc90-a1b748dca8af
 3status: experimental
 4description: Detects registry addition for LanmanServer MaxMpxCt. BlackCat does this to increase the number of outstanding requests allowed, such as SMB requests to distribute ransomware through an environment.
 5references:
 6    - https://www.microsoft.com/en-us/security/blog/2022/06/13/the-many-lives-of-blackcat-ransomware/
 7author: Micah Babinski
 8date: 2022/12/04
 9tags:
10    - attack.command_and_control
11    - attack.defense_evasion
12    - attack.t1105
13    - attack.t1562
14logsource:
15    category: registry_add
16    product: windows
17detection:
18    selection:
19        EventType: CreateKey
20        TargetObject: 'SYSTEM\CurrentControlSet\Services\LanmanServer\Parameters'
21    condition: selection
22falsepositives:
23    - Unknown
24level: high```