Fax Service DLL Search Order Hijack
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About the rule
Rule Type
Standard
Rule Description
The Fax service attempts to load ualapi.dll, which is non-existent. An attacker can then (side)load their own malicious DLL using this service.
Severity
Trouble
Rule Requirement
Criteria
Action1: actionname = "sa_imageloaded" AND (PROCESSNAME endswith "\fxssvc.exe" AND OBJECTNAME endswith "ualapi.dll") AND OBJECTNAME notstartswith "C:\Windows\WinSxS" select Action1.HOSTNAME,Action1.MESSAGE,Action1.PROCESSNAME,Action1.PRODUCT_NAME,Action1.OBJECTNAME
Detection
Execution Mode
realtime
Log Sources
Windows
Author
NVISO
