{"id":"fa3c117a-bc0d-416e-a31b-0c0e80653efb","title":"Chopper Webshell Process Pattern","description":"Detects patterns found in process executions cause by China Chopper like tiny (ASPX) webshells","author":"Florian Roth (Nextron Systems), MSTI (query)","status":"test","level":"high","date":"2022-10-01","modified":"","tags":["attack.persistence","attack.discovery","attack.t1505.003","attack.t1018","attack.t1033","attack.t1087"],"technique_ids":["T1018","T1033","T1087","T1505.003"],"logsource":{"category":"process_creation","product":"windows"},"falsepositives":["Unknown"],"references":["https://www.microsoft.com/security/blog/2022/09/30/analyzing-attacks-using-the-exchange-vulnerabilities-cve-2022-41040-and-cve-2022-41082/"],"source_path":"rules/windows/process_creation/proc_creation_win_webshell_chopper.yml","source_sha256":"bd83b28a410589b85ce907907a56adb48b973b2f6372a27c24c1be58464afc19","source_url":"https://github.com/anpa1200/sigma/blob/b249e9683190cffdcaf188ccbfb90bf4759844e1/rules/windows/process_creation/proc_creation_win_webshell_chopper.yml","license":"Detection Rule License 1.1","license_url":"https://github.com/SigmaHQ/Detection-Rule-License/blob/main/LICENSE.Detection.Rules.md","yaml":"title: Chopper Webshell Process Pattern\nid: fa3c117a-bc0d-416e-a31b-0c0e80653efb\nstatus: test\ndescription: Detects patterns found in process executions cause by China Chopper like tiny (ASPX) webshells\nreferences:\n    - https://www.microsoft.com/security/blog/2022/09/30/analyzing-attacks-using-the-exchange-vulnerabilities-cve-2022-41040-and-cve-2022-41082/\nauthor: Florian Roth (Nextron Systems), MSTI (query)\ndate: 2022-10-01\ntags:\n    - attack.persistence\n    - attack.discovery\n    - attack.t1505.003\n    - attack.t1018\n    - attack.t1033\n    - attack.t1087\nlogsource:\n    category: process_creation\n    product: windows\ndetection:\n    selection_origin:\n        - Image|endswith: '\\w3wp.exe'\n        - ParentImage|endswith: '\\w3wp.exe'\n    selection_cmdline:\n        CommandLine|contains:\n            - '&ipconfig&echo'\n            - '&quser&echo'\n            - '&whoami&echo'\n            - '&c:&echo'\n            - '&cd&echo'\n            - '&dir&echo'\n            - '&echo [E]'\n            - '&echo [S]'\n    condition: all of selection_*\nfalsepositives:\n    - Unknown\nlevel: high\n","validation":"yaml_parsed_not_backend_compiled_or_live_validated","techniques":[{"key":"enterprise/T1018","id":"T1018","name":"Remote System Discovery","page":"techniques/enterprise/T1018/"},{"key":"enterprise/T1033","id":"T1033","name":"System Owner/User Discovery","page":"techniques/enterprise/T1033/"},{"key":"enterprise/T1087","id":"T1087","name":"Account Discovery","page":"techniques/enterprise/T1087/"},{"key":"enterprise/T1505.003","id":"T1505.003","name":"Web Shell","page":"techniques/enterprise/T1505.003/"}],"data_path":"data/detection-rules/fa3c117a-bc0d-416e-a31b-0c0e80653efb.json","kind":"sigma"}