Detection rules › Sigma
Uncommon Outbound Kerberos Connection
Detects uncommon outbound network activity via Kerberos default port indicating possible lateral movement or first stage PrivEsc via delegation.
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Defense Evasion | T1550.003 Use Alternate Authentication Material: Pass the Ticket |
| Credential Access | T1558 Steal or Forge Kerberos Tickets |
| Lateral Movement | T1550.003 Use Alternate Authentication Material: Pass the Ticket |
Event coverage
| Provider | Event ID | Title |
|---|---|---|
| Sysmon | 3 | Network connection |
Stages and Predicates
Stage 1: selection
DestinationPort: 88
Initiated: true
Stage 2: not 1 of filter_main_lsass
Image: 'C:\Windows\System32\lsass.exe'
Stage 3: not 1 of filter_optional_*
or:
Image|endswith: '\tomcat\bin\tomcat8.exe'
Image: 'C:\Program Files (x86)\Google\Chrome\Application\chrome.exe'
Image: 'C:\Program Files (x86)\Mozilla Firefox\firefox.exe'
Image: 'C:\Program Files\Google\Chrome\Application\chrome.exe'
Image: 'C:\Program Files\Mozilla Firefox\firefox.exe'
Indicators
Each row is a field, operator, and value that the rule matches. The corpus column counts how many other rules in the catalog look for the same combination: high numbers point to widely-used, community-vetted indicators. Blank or 1 shows that the indicator is specific to this rule.
| Field | Kind | Values |
|---|---|---|
DestinationPort | eq |
|
Image | ends_with |
|
Image | eq |
|
Initiated | eq |
|