SigmaHQ Detections
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6,800 detections
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This rule detects potential Emotet malware activity by monitoring the creation of `rundll32.exe` processes. Specifically, it looks for `rundll32.exe` command lines that end with `,RunDLL` or `,Control_RunDLL`, which are common patterns used by Emotet for DLL loading. The rule includes filters to reduce false positives from legitimate DLL executions and specific development environment scenarios.
This rule detects potential successful exploitation of CVE-2021-26857, a Microsoft Exchange Server vulnerability. It specifically looks for abnormal child processes spawning from the 'UMWorkerProcess.exe' (Unified Messaging service) on Exchange servers. The rule filters out legitimate Windows Error Reporting processes ('wermgr.exe' and 'WerFault.exe') to reduce false positives, indicating that any other process spawned by 'UMWorkerProcess.exe' is considered suspicious and a potential indicator of compromise.
Detects file creation patterns indicative of the CVE-2021-40444 exploit, specifically the creation of CAB and INF files by Microsoft Word in temporary internet cache or local temporary directories.
Detects exploitation attempts of the SonicWall SSL/VPN Jarrewrite vulnerability. The rule looks for requests to '/cgi-bin/jarrewrite.sh' combined with specific patterns in the 'cs-user-agent' header that indicate command injection attempts, such as ':;', '() {', or '/bin/bash -c'. This targets a known vulnerability allowing attackers to execute arbitrary commands.
Detects a command used by the Conti ransomware group to list volume shadow copies and redirect the output to a log file. This activity is often a precursor to deleting shadow copies to prevent system recovery.
Detects a command line pattern used by the Conti ransomware group to archive and stage the NTDS.dit database for exfiltration. The rule specifically looks for the execution of '7za.exe' (7-Zip archiver) with a command line that includes '\C$\temp\log.zip', indicating the creation of a zip archive in a temporary location, a common step before exfiltration.
Detects potential C2 communication related to Devil Bait malware by identifying specific URI patterns in GET requests. The rule looks for URIs containing '/cross.php?op=', '&dt=', and '&uid=' which are indicative of Devil Bait's communication with its command and control server.
Detects a potential exploitation attempt of CVE-2023-25717, a Remote Code Execution vulnerability via an unauthenticated HTTP GET Request, in Ruckus Wireless Admin. The rule looks for specific URI query parameters including '/forms/doLogin', 'login_username', 'password', and the presence of '$(' or its URL-encoded version '%24%28', which are indicative of command injection.
Detects the creation of a file named "WerFault.exe" in the WinSxS directory by a non-system process. This activity is indicative of potential SNAKE malware persistence, as documented by the NSA and CISA. The rule specifically looks for file creations where the target filename starts with 'C:\Windows\WinSxS\' and ends with '\WerFault.exe', while excluding processes originating from standard Windows system directories to reduce false positives.
Detects potential beaconing activity to domains associated with the 3CXDesktopApp supply chain compromise. This rule specifically looks for DNS queries to known malicious domains identified during the compromise.
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