SigmaHQ Detections
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Detects potential exploitation attempts of CVE-2021-41379 (InstallerFileTakeOver), a local privilege escalation (LPE) vulnerability. This rule specifically looks for instances where a command interpreter (cmd.exe, powershell.exe, or pwsh.exe) is spawned as a child process of the Microsoft Edge elevation service (elevation_service.exe) with SYSTEM integrity level, indicating a successful privilege escalation.
Detects the use of common Linux utilities such as 'find', 'tree', 'findmnt', 'ls -R', and 'mlocate' for discovering files, directories, and potentially network shares. This activity is often performed by adversaries to gain situational awareness of the file system.
Detects remote thread creation in the 'mstsc.exe' process by a process originating from a suspicious temporary or public user directory. This technique is often used by attackers to inject code into 'mstsc.exe' to hook APIs and steal credentials during RDP authentications.
Detects the execution of SOAPHound, a .NET tool for collecting Active Directory data, using specific command-line arguments that may indicate an attempt to extract sensitive AD information. The rule specifically looks for command-line arguments related to building caches, dumping bloodhound data, certificate dumping, and DNS dumping, combined with arguments for cache filenames or output directories.
This rule detects the execution of the PingCastle utility, a legitimate Active Directory security assessment tool, when its executable name has been changed. Adversaries often rename legitimate tools to evade detection. The detection logic relies on identifying specific original file names within the PE metadata (OriginalFileName) and/or recognizing characteristic command-line arguments used by PingCastle, such as those related to scanner functions or health checks. The rule specifically filters out executions where the image path matches the original PingCastle executable names, focusing on instances where the binary has been renamed.
Detects system discovery activity carried out by Pikabot, such as network, user information, and domain groups. The malware Pikabot has been observed using this technique as part of its C2-botnet registration with a short collection time frame (less than 1 minute). The rule specifically looks for `ipconfig.exe /all`, `netstat.exe -aon`, and `whoami.exe /all` commands executed by processes whose grandparent image ends with `rundll32.exe` or parent image ends with `SearchFilterHost.exe` or `SearchProtocolHost.exe`.
Detects the use of the WMI command-line (WMIC) utility to identify and display various system information, including OS, CPU, GPU, disk drive names, memory capacity, display resolution, baseboard, BIOS, and GPU driver products/versions. This activity is often performed by adversaries during the discovery phase to understand the compromised environment.
This rule detects a specific User Account Control (UAC) bypass technique that leverages the Disk Cleanup utility (cleanmgr.exe) in conjunction with scheduled tasks. The detection logic looks for a process creation event where 'cleanmgr.exe' is executed with the '/autoclean /d C:' arguments, and its parent process is 'svchost.exe -k netsvcs -p -s Schedule', indicating it was launched by the Task Scheduler service. Furthermore, the rule specifies that the integrity level of the 'cleanmgr.exe' process must be 'High' or 'System', which is indicative of an elevated process, thus confirming a successful UAC bypass. This technique is associated with UACMe method 34.
This rule detects a specific User Account Control (UAC) bypass technique often associated with UACMe (specifically method 22). It triggers when 'werfault.exe' is spawned with high or system integrity levels, and its parent process is 'consent.exe'. This indicates an attempt to elevate privileges by exploiting a vulnerability in how consent.exe handles process creation, leading to an auto-elevated werfault.exe.
Detects potential Command and Control (C2) communication activity associated with the Peach Sandstorm APT group. The rule specifically looks for HTTP GET requests to '/api/Core/Command/Init' or '/api/Core/Command/Restart' endpoints, which are indicators of this group's C2 infrastructure.
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