SigmaHQ Detections
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Detects a CodePage modification using the "mode.com" utility. This behavior has been used by threat actors behind Dharma ransomware.
This rule detects attempts to bypass User Account Control (UAC) using the Microsoft Connection Manager Profile Installer (CMSTP) by abusing specific autoelevate-capable COM objects. The detection logic looks for processes where 'DllHost.exe' is the parent process, the parent command line contains specific COM Process IDs associated with CMSTP or related components, and the process is running with 'High' or 'System' integrity levels. This technique is often used by adversaries to elevate privileges without user interaction.
Detects the execution of 'wsreset.exe' with elevated privileges (High or System integrity levels). This behavior is indicative of a User Account Control (UAC) bypass attempt, as 'wsreset.exe' is a legitimate Windows utility that can be abused to elevate privileges without a UAC prompt.
Detects the "iexpress.exe" utility creating self-extracting packages. Attackers are known to leverage "iexpress" to compile packages on the fly via ".sed" files. This rule specifically looks for iexpress.exe either launching makecab.exe or iexpress.exe itself being launched with the '/n' command line argument, which is indicative of creating a new self-extracting package.
Detects when all rules have been deleted from the Windows Defender Firewall configuration. This action can be performed by an attacker to bypass network controls and facilitate command and control, lateral movement, or data exfiltration.
Detects the creation of Self Extraction Directive (.sed) files in suspicious locations. These files are used by the 'iexpress.exe' utility to create self-extracting packages. Adversaries have been observed abusing this utility to create PE files with embedded .sed entries, often as a defense evasion technique.
Detects executions of WScript.exe or CScript.exe that are running scripts with common extensions (e.g., .js, .vbs) from suspicious temporary or public user directories. This behavior is often associated with dropper scripts used in initial access or malware delivery.
Detects the execution of Accesschk.exe, a Sysinternals utility used for auditing permissions. Adversaries often abuse this tool to discover privileges and access rights on a system, which can aid in privilege escalation or further discovery within the environment.
This rule detects attempts to escalate privileges by modifying Windows service configurations using 'sc.exe' from a non-administrative context (Medium integrity level). Specifically, it looks for modifications to a service's 'binPath' (ImagePath) or 'FailureCommand', which could allow an attacker to execute arbitrary code with elevated privileges when the service starts or fails.
This rule detects attempts to bypass User Account Control (UAC) using the 'ComputerDefaults.exe' utility, specifically when it is executed with elevated integrity levels (High or System) and not as a child process of common system directories like 'System32' or 'Program Files'. This behavior is characteristic of UAC bypass tools such as UACMe (method 59).
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