Detection rules › Sigma
Suspicious Rundll32 Execution With Image Extension
Detects the execution of Rundll32.exe with DLL files masquerading as image files
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 |
Stages and Predicates
Stage 1: all of selection_img
or:
Image|endswith: '\rundll32.exe'
OriginalFileName: RUNDLL32.exe
Stage 2: all of selection_cli
or:
CommandLine|contains: .bmp
CommandLine|contains: .cr2
CommandLine|contains: .eps
CommandLine|contains: .gif
CommandLine|contains: .ico
CommandLine|contains: .jpeg
CommandLine|contains: .jpg
CommandLine|contains: .nef
CommandLine|contains: .orf
CommandLine|contains: .png
CommandLine|contains: .raw
CommandLine|contains: .sr2
CommandLine|contains: .tif
CommandLine|contains: .tiff
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 |
|
Image | ends_with |
|
OriginalFileName | eq |
|