Uncommon Outbound Kerberos Connection - Security

 1title: Uncommon Outbound Kerberos Connection - Security
 2id: eca91c7c-9214-47b9-b4c5-cb1d7e4f2350
 3related:
 4    - id: e54979bd-c5f9-4d6c-967b-a04b19ac4c74
 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.lateral-movement
16    - attack.credential-access
17    - attack.t1558.003
18logsource:
19    product: windows
20    service: security
21detection:
22    selection:
23        EventID: 5156
24        DestPort: 88
25    filter_main_lsass:
26        Application|startswith:
27            - '\device\harddiskvolume'
28            - 'C:'
29        Application|endswith: '\Windows\System32\lsass.exe'
30    filter_optional_chrome:
31        Application|startswith:
32            - '\device\harddiskvolume'
33            - 'C:'
34        Application|endswith:
35            - '\Program Files (x86)\Google\Chrome\Application\chrome.exe'
36            - '\Program Files\Google\Chrome\Application\chrome.exe'
37    filter_optional_firefox:
38        Application|startswith:
39            - '\device\harddiskvolume'
40            - 'C:'
41        Application|endswith:
42            - '\Program Files (x86)\Mozilla Firefox\firefox.exe'
43            - '\Program Files\Mozilla Firefox\firefox.exe'
44    filter_optional_tomcat:
45        Application|endswith: '\tomcat\bin\tomcat8.exe'
46    condition: selection and not 1 of filter_main_* and not 1 of filter_optional_*
47falsepositives:
48    - Web Browsers and third party application might generate similar activity. An initial baseline is required.
49level: medium