Ibrahim Saud
@tektrixIndiaCompletionist
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This rule detects potential 'Squiblydoo' attacks where regsvr32.exe is used to execute remote scriptlets via HTTP/HTTPS or loads the 'scrobj.dll' library in an unusual manner, such as without a local DLL file path, which is a common indicator of bypassing application allowlisting.
This rule detects the loading of known-vulnerable or malicious kernel drivers (BYOVD) followed by the termination of major EDR or security-related processes on the same host within a 10-minute window. This behavior is indicative of an adversary attempting to disable security controls to evade detection after achieving kernel-level privileges.
Detects the use of 7-Zip (7z.exe) to extract a file named drata.dat using command line arguments that indicate silent extraction from an encrypted or password-protected archive. This behavior is associated with the LegionLoader malware, which uses this technique to stage its payload.
Detects instances where a process named 'updater.exe' launches another process also named 'updater.exe'. This behavior is often associated with malware or malicious loaders (such as LegionLoader) that use secondary instances to facilitate malicious code execution or persistence while masquerading as legitimate update utilities.
Detects the registration of the gitlab-runner Windows service as a custom Event Log provider under the Application registry key. This registry modification occurs during the installation of the GitLab Runner service. When observed on endpoints not intended for CI/CD operations, this activity may indicate an adversary is installing a GitLab Runner for use as a C2 implant.
Detects a cluster of Windows Event IDs 4740 (Account Lockout) or 4724 (Password Reset) targeting the local 'Administrator' account across multiple hosts within a short time window. This activity is indicative of automated or mass account manipulation often associated with ransomware payloads or centralized GPO-based credential tampering.
Detects a significant number of endpoints processing Group Policy computer configurations within a short time window. This activity is indicative of a synchronized event, such as a domain-wide application of a newly modified or deployed Group Policy Object (GPO), which may follow a 'time-bomb' malicious GPO detonation or unauthorized policy change.
Detects network traffic consistent with a hardcoded C2 channel used by PolinRider or NullReceiver malware families. The rule monitors TCP traffic directed to a specific IP address (193.26.115.131) and port (15152) that contains serialized command/status structures formatted with specific JSON-like content patterns.
Detects the use of standard command-line utilities (curl, wget) by shell processes (bash, sh) on macOS when fetching a file with a specific force flag. This pattern is indicative of automated attempts to bypass existing file checks or force the download of remote payloads.
Detects instances where the rnpkeys process (likely used for GPG-related operations) spawns common Windows living-off-the-land binaries such as rundll32, regsvr32, msiexec, cmd, powershell, or wscript. It specifically monitors for patterns indicating potential script execution from temporary folders, the bypass of PowerShell execution policies, or the installation of products via msiexec, which may indicate malicious activity following initial compromise or delivery of a malicious payload.
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