Query: detect Detects "svchost.exe" spawning "rundll32.exe" with command arguments like C:\windows\system32\davclnt.dll,DavSetCookie. in logs
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 execution of a shell (powershell, bash, wsl...) via Visual Studio Code tunnel. Attackers can abuse this func. Logsource: windows / process_creation. Rule: title: Visual Studio Code Tunnel Shell Execution id: f4a623c2-4ef5-4c33-b811-0642f702c9f1 status: test description: Detects the execution of a shell (powershell, bash, wsl...) via Visual Studio Code tunnel. Attackers can abuse this functionality to establish a C2 channel and execute arbitrary commands on the system. references: - https://ipfyx.fr/post/visual-studio-code-tunnel/ - https://badoption.eu/blog/2023/01/31/code_c2.html - https://code.visualstudio.com/docs/remote/tunnels author: Nasreddine Bencherchali (Nextron Systems) date: 2023-10-25 tags: - attack.command-and-control - attack.t1071.001 logsource: category: process_creation product: windows detection: selection_parent: ParentImage|contains: \servers\Stable- ParentImage|endswith: \server\node.exe ParentCommandLine|contains: .vscode-server selection_child_1: Image|endswith: - \powershell.exe - \pwsh.exe CommandLine|contains: \terminal\browser\media\shellIntegration.ps1 selection_child_2: Image|endswith: - \wsl.exe - \bash.exe condition: selection_parent and 1 of selection_child_* falsepositives: - Legitimate use of Visual Studio Code tunnel and running code from there level: medium