SigmaHQ Detections
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Detects suspicious child processes of Excel which could be an indicator of lateral movement leveraging the "ActivateMicrosoftApp" Excel DCOM object.
Detects the execution of "whoami.exe" by privileged accounts that are often abused by threat actors
Detects the execution of "whoami.exe" with the "/FO" flag to choose CSV as output format or with redirection options to export the results to a file for later use.
Detects the creation of a specific file path commonly used in Proof-of-Concept (PoC) exploits for the Print Spooler vulnerability CVE-2021-1675, also known as PrintNightmare. This file path is typically created when an attacker successfully exploits the vulnerability to achieve remote code execution or privilege escalation.
Detects the use of a scanner by zerosum0x0 that discovers targets vulnerable to CVE-2019-0708 RDP RCE, also known as BlueKeep. The detection specifically looks for failed RDP login attempts (EventID 4625) with a TargetUserName of 'AAAAAAA', which is a known signature of this scanner.
Detects events of driver load errors in print service logs that could be a sign of successful exploitation attempts of print spooler vulnerability CVE-2021-1675, also known as PrintNightmare. The rule specifically looks for EventID 808 with ErrorCode 0x45A or 0x7e, combined with keywords indicating a plug-in module load failure and common DLL names used in PrintNightmare Proof-of-Concept exploits.
Detects suspicious DLL loads by the Windows Print Spooler service from its backup driver folders. This behavior is indicative of exploitation attempts related to vulnerabilities like PrintNightmare (CVE-2021-1675, CVE-2021-34527) where an attacker can force the spooler service to load arbitrary DLLs, leading to privilege escalation or remote code execution.
Detects specific process creation patterns associated with UNC2452 (SolarWinds Compromise) activity, as identified by Microsoft Defender ATP queries. This includes the use of 7-Zip for archiving, wscript.exe executing VBS scripts, and rundll32.exe for DLL execution, often involving specific command-line arguments and parent-child relationships.
This rule detects suspicious errors related to the Remote Desktop Protocol (RDP) that could indicate an attempt to exploit CVE-2019-0708, also known as BlueKeep. It specifically looks for Event IDs 56 or 50 generated by the 'TermDD' provider, which are associated with RDP session errors that can occur during exploitation attempts.
This rule detects attempts to exploit the PrintNightmare vulnerability (CVE-2021-1675) by monitoring for DLL deletions within the Windows Spooler Service driver folder. Specifically, it looks for `spoolsv.exe` deleting files in `C:\Windows\System32\spool\drivers\x64\3\`, which is a common indicator of this exploit.
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