Detection rules › Sigma
NtdllPipe Like Activity Execution
Detects command that type the content of ntdll.dll to a different file or a pipe in order to evade AV / EDR detection. As seen being used in the POC NtdllPipe
Event coverage
| Provider | Event ID | Title |
|---|---|---|
| Sysmon | 1 | Process creation |
| Security-Auditing | 4688 | A new process has been created. |
Stages and Predicates
Stage 1: selection
or:
CommandLine|contains: '\\ntdll.dll > \\\\.\\pipe\\'
CommandLine|contains: 'type %systemroot%\system32\ntdll.dll'
CommandLine|contains: 'type %windir%\system32\ntdll.dll'
CommandLine|contains: 'type c:\windows\system32\ntdll.dll'
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 |
|---|---|---|
CommandLine | match |
|