Suspicious File Download From IP Via Wget.EXE

 1title: Suspicious File Download From IP Via Wget.EXE
 2id: 17f0c0a8-8bd5-4ee0-8c5f-a342c0199f35
 3status: test
 4description: Detects potentially suspicious file downloads directly from IP addresses using Wget.exe
 5references:
 6    - https://www.gnu.org/software/wget/manual/wget.html
 7author: Nasreddine Bencherchali (Nextron Systems)
 8date: 2023-07-27
 9tags:
10    - attack.execution
11logsource:
12    category: process_creation
13    product: windows
14detection:
15    selection_img:
16        - Image|endswith: '\wget.exe'
17        - OriginalFileName: 'wget.exe'
18    selection_ip:
19        CommandLine|re: '://[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}'
20    selection_http:
21        CommandLine|contains: 'http'
22    selection_flag:
23        - CommandLine|re: '\s-O\s'
24        - CommandLine|contains: '--output-document'
25    selection_ext:
26        CommandLine|endswith:
27            # Note you can transform this into a "contains" to increase coverage but you would need to take care of some FP.
28            - '.ps1'
29            - ".ps1'"
30            - '.ps1"'
31            - '.dat'
32            - ".dat'"
33            - '.dat"'
34            - '.msi'
35            - ".msi'"
36            - '.msi"'
37            - '.bat'
38            - ".bat'"
39            - '.bat"'
40            - '.exe'
41            - ".exe'"
42            - '.exe"'
43            - '.vbs'
44            - ".vbs'"
45            - '.vbs"'
46            - '.vbe'
47            - ".vbe'"
48            - '.vbe"'
49            - '.hta'
50            - ".hta'"
51            - '.hta"'
52            - '.dll'
53            - ".dll'"
54            - '.dll"'
55            - '.psm1'
56            - ".psm1'"
57            - '.psm1"'
58    condition: all of selection_*
59falsepositives:
60    - Unknown
61level: high