1type: trigger
2name: sigmahq/proc_creation_win_bitsadmin_download_susp_extensions
3description: |
4  Detects usage of bitsadmin downloading a file with a suspicious extension
5filter: |
6  (evt.Meta.service == 'sysmon' && evt.Parsed.EventID == '1') && ((evt.Parsed.Image endsWith '\\bitsadmin.exe' || evt.Parsed.OriginalFileName == 'bitsadmin.exe') && (evt.Parsed.CommandLine contains ' /transfer ' || evt.Parsed.CommandLine contains ' /create ' || evt.Parsed.CommandLine contains ' /addfile ') && (evt.Parsed.CommandLine contains '.7z' || evt.Parsed.CommandLine contains '.asax' || evt.Parsed.CommandLine contains '.ashx' || evt.Parsed.CommandLine contains '.asmx' || evt.Parsed.CommandLine contains '.asp' || evt.Parsed.CommandLine contains '.aspx' || evt.Parsed.CommandLine contains '.bat' || evt.Parsed.CommandLine contains '.cfm' || evt.Parsed.CommandLine contains '.cgi' || evt.Parsed.CommandLine contains '.chm' || evt.Parsed.CommandLine contains '.cmd' || evt.Parsed.CommandLine contains '.dll' || evt.Parsed.CommandLine contains '.gif' || evt.Parsed.CommandLine contains '.jpeg' || evt.Parsed.CommandLine contains '.jpg' || evt.Parsed.CommandLine contains '.jsp' || evt.Parsed.CommandLine contains '.jspx' || evt.Parsed.CommandLine contains '.log' || evt.Parsed.CommandLine contains '.png' || evt.Parsed.CommandLine contains '.ps1' || evt.Parsed.CommandLine contains '.psm1' || evt.Parsed.CommandLine contains '.rar' || evt.Parsed.CommandLine contains '.scf' || evt.Parsed.CommandLine contains '.sct' || evt.Parsed.CommandLine contains '.txt' || evt.Parsed.CommandLine contains '.vbe' || evt.Parsed.CommandLine contains '.vbs' || evt.Parsed.CommandLine contains '.war' || evt.Parsed.CommandLine contains '.wsf' || evt.Parsed.CommandLine contains '.wsh' || evt.Parsed.CommandLine contains '.xll' || evt.Parsed.CommandLine contains '.zip'))
7blackhole: 2m
8#status: test
9labels:
10  service: windows
11  confidence: 1
12  spoofable: 0
13  classification:
14   - attack.t1197
15   - attack.t1036.003
16
17  label: "File With Suspicious Extension Downloaded Via Bitsadmin"
18  behavior : "windows:audit"
19  remediation: false
20
21scope:
22  type: ParentProcessId
23  expression: evt.Parsed.ParentProcessId
24
25