Detection rules › Sigma
Potential DLL Sideloading Using Coregen.exe
Detect usage of the "coregen.exe" (Microsoft CoreCLR Native Image Generator) binary to sideload arbitrary DLLs.
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Privilege Escalation | T1055 Process Injection |
| Defense Evasion | T1055 Process Injection, T1218 System Binary Proxy Execution |
Event coverage
| Provider | Event ID | Title |
|---|---|---|
| Sysmon | 7 | Image loaded |
Stages and Predicates
Stage 1: selection
Image|endswith: '\coregen.exe'
Stage 2: not 1 of filter_main_legit_paths
or:
ImageLoaded|startswith: 'C:\Program Files (x86)\Microsoft Silverlight\'
ImageLoaded|startswith: 'C:\Program Files\Microsoft Silverlight\'
ImageLoaded|startswith: 'C:\Windows\SysWOW64\'
ImageLoaded|startswith: 'C:\Windows\System32\'
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 |
|---|---|---|
Image | ends_with |
|
ImageLoaded | starts_with |
|