Detection rules › Sigma
Potentially Suspicious Rundll32.EXE Execution of UDL File
Detects the execution of rundll32.exe with the oledb32.dll library to open a UDL file. Threat actors can abuse this technique as a phishing vector to capture authentication credentials or other sensitive data.
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Defense Evasion | T1218.011 System Binary Proxy Execution: Rundll32 |
| Command & Control | T1071 Application Layer Protocol |
Event coverage
| Provider | Event ID | Title |
|---|---|---|
| Sysmon | 1 | Process creation |
Stages and Predicates
Stage 1: all of selection_parent
ParentImage|endswith: '\explorer.exe'
Stage 2: all of selection_img
or:
Image|endswith: '\rundll32.exe'
OriginalFileName: RUNDLL32.EXE
Stage 3: all of selection_cli
CommandLine|endswith: .udl
CommandLine|contains: ',OpenDSLFile '
CommandLine|contains: '\\Users\\*\\Downloads\\'
CommandLine|contains: oledb32.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 | ends_with |
|
CommandLine | match |
|
Image | ends_with |
|
OriginalFileName | eq |
|
ParentImage | ends_with |
|