Detection rules › Sigma
Potential Mpclient.DLL Sideloading Via OfflineScannerShell.EXE Execution
Detects execution of Windows Defender "OfflineScannerShell.exe" from its non standard directory. The "OfflineScannerShell.exe" binary is vulnerable to DLL side loading and will load any DLL named "mpclient.dll" from the current working directory.
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Defense Evasion | T1218 System Binary Proxy Execution |
Event coverage
| Provider | Event ID | Title |
|---|---|---|
| Sysmon | 1 | Process creation |
Stages and Predicates
Stage 1: selection
or:
Image|endswith: '\OfflineScannerShell.exe'
OriginalFileName: OfflineScannerShell.exe
Stage 2: not 1 of filter_main_*
or:
CurrentDirectory: ''
CurrentDirectory: 'C:\Program Files\Windows Defender\Offline\'
CurrentDirectory: null
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 |
|---|---|---|
CurrentDirectory | eq |
|
Image | ends_with |
|
OriginalFileName | eq |
|