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.privilege-escalation
13    - attack.defense-evasion
14    - attack.t1055
15    - detection.emerging-threats
16logsource:
17    category: process_creation
18    product: windows
19detection:
20    selection:
21        ParentImage|endswith:
22            - '\chrome.exe'
23            - '\firefox.exe'
24            - '\msedge.exe'
25        Image|endswith: '\rundll32.exe'
26        CommandLine|endswith: '\rundll32.exe'
27    condition: selection
28falsepositives:
29    - Unlikely
30level: high