Detection rules › Sigma
Suspicious Rundll32 Activity Invoking Sys File
Detects suspicious process related to rundll32 based on command line that includes a *.sys file as seen being used by UNC2452
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Defense Evasion | T1218.011 System Binary Proxy Execution: Rundll32 |
Event coverage
| Provider | Event ID | Title |
|---|---|---|
| Sysmon | 1 | Process creation |
| Security-Auditing | 4688 | A new process has been created. |
Stages and Predicates
Stage 1: all of selection1
CommandLine|contains: rundll32.exe
Stage 2: all of selection2
or:
CommandLine|contains: '.sys '
CommandLine|contains: '.sys,'
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 |
|
Neighbors
Stricter alternatives (narrower than this rule)
The rules below may be useful if you find the current rule is too noisy / lacks specificity.
- Suspicious Rundll32 Invoking Inline VBScript (adds 3 filters)
- HackTool - F-Secure C3 Load by Rundll32 (adds 2 filters)