Chopper Webshell Process Pattern

 1title: Chopper Webshell Process Pattern
 2id: fa3c117a-bc0d-416e-a31b-0c0e80653efb
 3status: test
 4description: Detects patterns found in process executions cause by China Chopper like tiny (ASPX) webshells
 5references:
 6    - https://www.microsoft.com/security/blog/2022/09/30/analyzing-attacks-using-the-exchange-vulnerabilities-cve-2022-41040-and-cve-2022-41082/
 7author: Florian Roth (Nextron Systems), MSTI (query)
 8date: 2022-10-01
 9tags:
10    - attack.persistence
11    - attack.discovery
12    - attack.t1505.003
13    - attack.t1018
14    - attack.t1033
15    - attack.t1087
16logsource:
17    category: process_creation
18    product: windows
19detection:
20    selection_origin:
21        - Image|endswith: '\w3wp.exe'
22        - ParentImage|endswith: '\w3wp.exe'
23    selection_cmdline:
24        CommandLine|contains:
25            - '&ipconfig&echo'
26            - '&quser&echo'
27            - '&whoami&echo'
28            - '&c:&echo'
29            - '&cd&echo'
30            - '&dir&echo'
31            - '&echo [E]'
32            - '&echo [S]'
33    condition: all of selection_*
34falsepositives:
35    - Unknown
36level: high