Malicious DLL Injection via Mavinject Process Creation
- Product
- windows
- Category
- process_creation
- Author
- HuntRule
- Published
- 2026-09-15
- Updated
- 2026-09-15
ATT&CK techniques
Priv Esc → Defense EvasionRecon
Resource Dev
Initial Access
Execution
Persistence
Defense Evasion
Cred Access
Discovery
Lateral Movement
Collection
C2
Exfiltration
Impact
What it detects
This rule detects mavinject being used with the INJECTRUNNING option to inject a DLL into a running process, the injection primitive abused in the SHIM Me What You Got technique. Outside of App-V, this signed living-off-the-land binary is rarely used, making the injection flag a strong malicious indicator.
Reporting behind it
- deepinstinct.comhttps://www.deepinstinct.com/blog/SHIM-Me-What-You-Got:-Manipulating-Shim-and-Office-for-Code-Injection
- attack.mitre.orghttps://attack.mitre.org/techniques/T1055/001/
- deepinstinct.comhttps://www.deepinstinct.com/ja/blog/SHIM-Me-What-You-Got:-Manipulating-Shim-and-Office-for-Code-Injection
Detection content is published as a reviewed draft. Tune thresholds and exclusions against your own telemetry before enabling this rule for alerting.
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