MediumSigmaHQ Nasreddine Bencherchali (Nextron Systems)

Suspicious IIS URL GlobalRules Rewrite Via AppCmd

Detects usage of "appcmd" to create new global URL rewrite rules. This behaviour has been observed being used by threat actors to add new rules so they can access their webshells.

Detection logic

Detection requirements

Log source product: windows
Log source category: process_creation

Known benign triggers

Legitimate usage of appcmd to add new URL rewrite rules

References

Links the source published beside this detection. Reference is the link the source wrote, unmodified. Class is decided by this catalogue from the host and path, not stated by the source. Cited by counts published detections citing the same resource, including this one, and the sources beneath it count the repositories this catalogue ingests, which is not the same as independent research.
Reference	Class	Cited by
learn.microsoft.com/en-us/answers/questions/739120/how-to-add-re-write-global-rule-with-action-type-r	Product documentation	Only this detection cites it
twitter.com/malmoeb/status/1616702107242971144	Social post	Only this detection cites it

Detection rules

Suspicious IIS URL GlobalRules Rewrite Via AppCmd

Detection logic

Detection requirements

Known benign triggers

MITRE ATT&CK mappings

References

From the source

Licence

Authorship

Detection rules