1type: trigger
2name: sigmahq/proc_creation_win_gpg4win_susp_location
3description: |
4  Detects usage of Gpg4win to encrypt/decrypt files located in potentially suspicious locations.
5filter: |
6  (evt.Meta.service == 'sysmon' && evt.Parsed.EventID == '1') && ((evt.Parsed.Image endsWith '\\gpg.exe' || evt.Parsed.Image endsWith '\\gpg2.exe' || evt.Parsed.Product == 'GNU Privacy Guard (GnuPG)' || evt.Parsed.Description == 'GnuPG’s OpenPGP tool') && evt.Parsed.CommandLine contains '-passphrase' && (evt.Parsed.CommandLine contains ':\\PerfLogs\\' || evt.Parsed.CommandLine contains ':\\Temp\\' || evt.Parsed.CommandLine contains ':\\Users\\Public\\' || evt.Parsed.CommandLine contains ':\\Windows\\Temp\\' || evt.Parsed.CommandLine contains '\\AppData\\Local\\Temp\\' || evt.Parsed.CommandLine contains '\\AppData\\Roaming\\'))
7blackhole: 2m
8#status: test
9labels:
10  service: windows
11  confidence: 1
12  spoofable: 0
13  classification:
14
15  label: "File Encryption/Decryption Via Gpg4win From Suspicious Locations"
16  behavior : "windows:audit"
17  remediation: false
18
19scope:
20  type: ParentProcessId
21  expression: evt.Parsed.ParentProcessId
22
23