Uncommon Outbound Kerberos Connection

 1title: Uncommon Outbound Kerberos Connection
 2id: e54979bd-c5f9-4d6c-967b-a04b19ac4c74
 3related:
 4    - id: eca91c7c-9214-47b9-b4c5-cb1d7e4f2350
 5      type: similar
 6status: test
 7description: |
 8        Detects uncommon outbound network activity via Kerberos default port indicating possible lateral movement or first stage PrivEsc via delegation.
 9references:
10    - https://github.com/GhostPack/Rubeus
11author: Ilyas Ochkov, oscd.community
12date: 2019-10-24
13modified: 2024-03-15
14tags:
15    - attack.defense-evasion
16    - attack.credential-access
17    - attack.t1558
18    - attack.lateral-movement
19    - attack.t1550.003
20logsource:
21    category: network_connection
22    product: windows
23detection:
24    selection:
25        DestinationPort: 88
26        Initiated: 'true'
27    filter_main_lsass:
28        Image: 'C:\Windows\System32\lsass.exe'
29    filter_optional_chrome:
30        Image:
31            - 'C:\Program Files (x86)\Google\Chrome\Application\chrome.exe'
32            - 'C:\Program Files\Google\Chrome\Application\chrome.exe'
33    filter_optional_firefox:
34        Image:
35            - 'C:\Program Files (x86)\Mozilla Firefox\firefox.exe'
36            - 'C:\Program Files\Mozilla Firefox\firefox.exe'
37    filter_optional_tomcat:
38        Image|endswith: '\tomcat\bin\tomcat8.exe'
39    condition: selection and not 1 of filter_main_* and not 1 of filter_optional_*
40falsepositives:
41    - Web Browsers and third party application might generate similar activity. An initial baseline is required.
42level: medium