Injected Browser Process Spawning Rundll32 - GuLoader Activity

 1title: Injected Browser Process Spawning Rundll32 - GuLoader Activity
 2id: 89e1490f-1a3e-452a-bbb8-b68a5f58072f
 3status: test
 4description: |
 5    Detects the execution of installed GuLoader malware on the host.
 6    GuLoader is initiating network connections via the rundll32.exe process that is spawned via a browser parent(injected) process.    
 7references:
 8    - Internal Research
 9author: '@kostastsale'
10date: 2023-08-07
11tags:
12    - attack.defense-evasion
13    - attack.t1055
14    - detection.emerging-threats
15logsource:
16    category: process_creation
17    product: windows
18detection:
19    selection:
20        ParentImage|endswith:
21            - '\chrome.exe'
22            - '\firefox.exe'
23            - '\msedge.exe'
24        Image|endswith: '\rundll32.exe'
25        CommandLine|endswith: '\rundll32.exe'
26    condition: selection
27falsepositives:
28    - Unlikely
29level: high