SigmaHQ Detections
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Detects the installation of a DNS plugin DLL via ServerLevelPluginDll parameter in the registry using dnscmd.exe, which can be used to execute code in the context of the DNS server (restart required). This technique can be used for privilege escalation or persistence.
This rule detects the suspicious execution of 'explorer.exe' with the '/NOUACCHECK' command-line flag. This flag can be used to bypass User Account Control (UAC) checks for all subprocesses launched by the newly started explorer.exe instance, potentially allowing an attacker to elevate privileges or execute malicious code without user interaction. The rule filters out legitimate instances where 'explorer.exe' is launched by the Windows Task Scheduler service ('svchost.exe -k netsvcs -p -s Schedule').
Detects usage of HollowReaper, a process hollowing shellcode launcher used for stealth payload execution through process hollowing. It replaces the memory of a legitimate process with custom shellcode, allowing the attacker to execute payloads under the guise of trusted binaries.
Detects the execution of PktMon.exe, a legitimate Windows utility that can be used to capture network packets. Adversaries may abuse this tool for network sniffing to gather information about the environment, including potential credentials or network configurations.
Detects suspicious DACL modifications via the "Set-Service" cmdlet using the "SecurityDescriptorSddl" flag (Only available with PowerShell 7) that can be used to hide services or make them unstopable.
Detects the execution of 'register-cimprovider.exe' with command-line arguments indicating an attempt to register a DLL. This technique can be used by adversaries to achieve persistence, privilege escalation, or defense evasion by loading malicious DLLs through a legitimate Windows binary.
Detects the execution of ScreenConnect, a legitimate remote access tool, when it is used to establish a remote access session. The rule specifically looks for command-line arguments indicative of a guest connection to a ScreenConnect session.
Detects suspicious modifications to a Windows service's Discretionary Access Control List (DACL) using 'sc.exe' to deny access to critical trustees. This technique can be used by adversaries to hide services, make them unstoppable, or achieve persistence and privilege escalation by preventing legitimate users or administrators from managing the service.
Detects the creation of a scheduled task where the task name (`/TN`) is a GUID-like string. This behavior is often observed in malware or advanced persistent threats to maintain persistence or execute malicious code, as using GUIDs can help obfuscate the task's purpose or make it less conspicuous among legitimate tasks.
Detects the addition of users to the local 'Remote Desktop Users' group using either the 'net localgroup' command or the 'Add-LocalGroupMember' PowerShell cmdlet. This activity can indicate an adversary attempting to establish persistence or facilitate lateral movement via Remote Desktop Protocol.
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