Detections
Explore public detection logic contributed by the community across SIEM and rule languages.
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The analytic detects the loading of `msi.dll` by a binary not located in `system32`, `syswow64`, `winsxs`, or `windows` directories. This is identified using Sysmon EventCode 7, which logs DLL loads, and filters out legitimate system paths. This activity is significant as it may indicate exploitation of CVE-2021-41379 or DLL side-loading attacks, both of which can lead to unauthorized system modifications. If confirmed malicious, this could allow an attacker to execute arbitrary code, escalate privileges, or persist within the environment.
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 a Proof-of-Concept (PoC) tool designed to exploit the Local Privilege Escalation (LPE) vulnerability CVE-2021-41379. The rule specifically looks for MsiInstaller Event ID 1033 with the data containing 'test pkg', which is indicative of the PoC's activity.
Detects signs of the exploitation of Local Privilege Escalation (LPE) vulnerability CVE-2021-41379. This specific rule identifies the creation of an 'elevation_service.exe' file by 'msiexec.exe' within the Microsoft Edge application directory, which is a known indicator of this exploit.