Rule Info
Name
MaxMpxCt Registry Value Changed
Author
Nasreddine Bencherchali (Nextron Systems)
Description
Detects changes to the "MaxMpxCt" registry value.
MaxMpxCt specifies the maximum outstanding network requests for the server per client, which is used when negotiating a Server Message Block (SMB) connection with a client. Note if the value is set beyond 125 older Windows 9x clients will fail to negotiate.
Ransomware threat actors and operators (specifically BlackCat) were seen increasing this value in order to handle a higher volume of traffic.
Date
2024-03-19 00:00:00
Modified
None
Id
0e6a9e62-627e-496c-aef5-bfa39da29b5e
Tags
attack.defense-evasion attack.t1070.005 DEMO
Type
Community Rule
Link to Public Repo
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