Query: detection rule: Detects "svchost.exe" spawning "rundll32.exe" with command arguments like C:\windows\system32\davclnt.dll,DavSetCookie.
Matching passage: Sigma rule: Detects "svchost.exe" spawning "rundll32.exe" with command arguments like C:\windows\system32\davclnt.dll,DavSetCookie.. Logsource: windows / process_creation. Rule: title: Suspicious WebDav Client Execution Via Rundll32.EXE id: 982e9f2d-1a85-4d5b-aea4-31f5e97c6555 status: test description: 'Detects "svchost.exe" spawning "rundll32.exe" with command arguments like C:\windows\system32\davclnt.dll,DavSetCookie. This could be an indicator of exfiltration or use of WebDav to launch code (hosted on WebDav Server) or potentially a sign of exploitation of CVE-2023-23397 ' references: - https://twitter.com/aceresponder/status/1636116096506818562 - https://www.mdsec.co.uk/2023/03/exploiting-cve-2023-23397-microsoft-outlook-elevation-of-privilege-vulnerability/ - https://www.pwndefend.com/2023/03/15/the-long-game-persistent-hash-theft/ - https://www.microsoft.com/en-us/security/blog/wp-content/uploads/2023/03/Figure-7-sample-webdav-process-create-event.png - https://www.microsoft.com/en-us/security/blog/2023/03/24/guidance-for-investigating-attacks-using-cve-2023-23397/ author: Nasreddine Bencherchali (Nextron Systems), Florian Roth (Nextron Systems) date: 2023-03-16 modified: 2023-09-18 tags: - attack.exfiltration - attack.t1048.003 - cve.2023-23397 logsource: category: process_creation product: windows detection: selection: ParentImage|endswith: \svchost.exe ParentCommandLine|contains: -s WebClient Image|endswith: \rundll32.exe CommandLine|contains: C:\windows\system32\davclnt.dll,DavSetCookie CommandLine|re: ://\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3} filter_local_ips: CommandLine|contains: - ://10. - ://192.168. - ://172.16. - ://172.17. - ://172.18. - ://172.19. - ://172.20. - ://172.21. - ://172.22. - ://172.23. - ://172.24. - ://172.25. - ://172.26. - ://172.27. - ://172.28. - ://172.29. - ://172.30. - ://172.31. - ://127. - ://169.254. condition: selection and not 1 of filter_* falsepositives: - Unknown level: high
Near-miss passage: Sigma rule: Detects the use of the Microsoft signed script "CL_mutexverifiers" to proxy the execution of additional PowerShell scrip. Logsource: windows / process_creation. Rule: title: Potential Script Proxy Execution Via CL_Mutexverifiers.ps1 id: 1e0e1a81-e79b-44bc-935b-ddb9c8006b3d status: test description: Detects the use of the Microsoft signed script "CL_mutexverifiers" to proxy the execution of additional PowerShell script commands references: - https://lolbas-project.github.io/lolbas/Scripts/CL_mutexverifiers/ author: Nasreddine Bencherchali (Nextron Systems), oscd.community, Natalia Shornikova, frack113 date: 2022-05-21 modified: 2023-08-17 tags: - attack.stealth - attack.t1216 logsource: category: process_creation product: windows detection: selection_pwsh: ParentImage|endswith: - \powershell.exe - \pwsh.exe Image|endswith: \powershell.exe CommandLine|contains: ' -nologo -windowstyle minimized -file ' selection_temp: CommandLine|contains: - \AppData\Local\Temp\ - \Windows\Temp\ condition: all of selection_* falsepositives: - Unknown level: medium