Suspicious Invoke-WebRequest Execution

 1title: Suspicious Invoke-WebRequest Execution
 2id: 5e3cc4d8-3e68-43db-8656-eaaeefdec9cc
 3related:
 4    - id: e218595b-bbe7-4ee5-8a96-f32a24ad3468
 5      type: derived
 6status: experimental
 7description: Detects a suspicious call to Invoke-WebRequest cmdlet where the and output is located in a suspicious location
 8references:
 9    - https://www.sentinelone.com/blog/living-off-windows-defender-lockbit-ransomware-sideloads-cobalt-strike-through-microsoft-security-tool/
10author: Nasreddine Bencherchali (Nextron Systems)
11date: 2022/08/02
12modified: 2024/02/23
13tags:
14    - attack.command_and_control
15    - attack.t1105
16logsource:
17    category: process_creation
18    product: windows
19detection:
20    selection_img:
21        - Image|endswith:
22              - '\powershell.exe'
23              - '\pwsh.exe'
24        - OriginalFileName:
25              - 'PowerShell.EXE'
26              - 'pwsh.dll'
27    selection_commands:
28        CommandLine|contains:
29            # These are all aliases of Invoke-WebRequest
30            - 'curl '
31            - 'Invoke-WebRequest'
32            - 'iwr '
33            - 'wget '
34    selection_flags:
35        CommandLine|contains:
36            - ' -ur'
37            - ' -o'
38    selection_susp_locations:
39        CommandLine|contains:
40            - '\AppData\'
41            - '\Desktop\'
42            - '\Temp\'
43            - '\Users\Public\'
44            - '%AppData%'
45            - '%Public%'
46            - '%Temp%'
47            - '%tmp%'
48            - ':\Windows\'
49    condition: all of selection_*
50falsepositives:
51    - Unknown
52level: high