Malicious IIS Native Module Installation via Appcmd IsapiCachesModule (via process_creation)
- Product
- windows
- Category
- process_creation
- Author
- HuntRule
- Published
- 2026-06-25
- Updated
- 2026-08-28
ATT&CK techniques
PersistenceRecon
Resource Dev
Initial Access
Execution
Persistence
Priv Esc
Defense Evasion
Cred Access
Discovery
Lateral Movement
Collection
C2
Exfiltration
Impact
What it detects
This rule detects appcmd.exe installing a native IIS module named IsapiCachesModule backed by a caches.dll image as used by the Larva-25003 IIS malware. Registering a malicious native module allows the actor to intercept and manipulate all HTTP traffic on the server.
Reporting behind it
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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