Lacey Cochrane
@NullVectorXUSTrusted contributorCompletionist
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245 detections
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Timestomping Detection
Cortex XDR
This rule detects potential timestomping activity by identifying files where the creation time is later than the modification time. This behavior can indicate an adversary attempting to manipulate file timestamps to evade detection or forensic analysis. The rule specifically targets executable and script file extensions.
Detects attempts to tamper with AWS CloudTrail or GuardDuty logging configurations by monitoring specific API calls that can disable, modify, or delete logging mechanisms. This includes actions like stopping logging, deleting trails, updating trails, disassociating from master accounts, archiving findings, stopping member monitoring, and deleting or updating detectors. Successful execution of these actions without an error indicates potential malicious activity aimed at evading detection.
This rule detects the execution of 'rundll32.exe' with suspicious DLL names in the command line, specifically 'machinerie.dll', 'checkme.dll', or 'iamnotarobot.dll'. Additionally, it identifies the loading of specific malicious DLLs by their SHA256 hashes, which have been associated with ColdRiver (Star Blizzard) activity. This behavior is indicative of potential malware execution or persistence mechanisms.
Mythic C2 over SMB Detection
Cortex XDR
This rule detects potential Mythic C2 activity communicating over SMB. It identifies network traffic using the SMB protocol with a total upload size greater than 360 bytes, originating from and destined for private IP address ranges. The rule then groups these connections by agent hostname, local IP, remote IP, and process image name, flagging instances where three or more such connections occur within a 7-day timeframe, indicating potential beaconing behavior.
This rule detects the use of bitsadmin to download specific Python scripts ('libsystemhealthcheck.py' or 'libcryptopydatasize.py') from the 'inspectguarantee.org' domain. This activity is associated with the COLDDRIVER (Star Blizzard) threat group, which uses BITSAdmin for ingress tool transfer.
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