1type: trigger
2name: sigmahq/proc_creation_win_aspnet_compiler_susp_paths
3description: |
4  Detects execution of "aspnet_compiler.exe" with potentially suspicious paths for compilation.
5filter: |
6  (evt.Meta.service == 'sysmon' && evt.Parsed.EventID == '1') && ((evt.Parsed.Image contains 'C:\\Windows\\Microsoft.NET\\Framework\\' || evt.Parsed.Image contains 'C:\\Windows\\Microsoft.NET\\Framework64\\') && evt.Parsed.Image endsWith '\\aspnet_compiler.exe' && (evt.Parsed.CommandLine contains '\\Users\\Public\\' || evt.Parsed.CommandLine contains '\\AppData\\Local\\Temp\\' || evt.Parsed.CommandLine contains '\\AppData\\Local\\Roaming\\' || evt.Parsed.CommandLine contains ':\\Temp\\' || evt.Parsed.CommandLine contains ':\\Windows\\Temp\\' || evt.Parsed.CommandLine contains ':\\Windows\\System32\\Tasks\\' || evt.Parsed.CommandLine contains ':\\Windows\\Tasks\\'))
7blackhole: 2m
8#status: test
9labels:
10  service: windows
11  confidence: 1
12  spoofable: 0
13  classification:
14   - attack.t1127
15
16  label: "Potentially Suspicious ASP.NET Compilation Via AspNetCompiler"
17  behavior : "windows:audit"
18  remediation: false
19
20scope:
21  type: ParentProcessId
22  expression: evt.Parsed.ParentProcessId
23
24