CredUI.DLL Loaded By Uncommon Process
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About the rule
Rule Type
Standard
Rule Description
Detects loading of "credui.dll" and related DLLs by an uncommon process. Attackers might leverage this DLL for potential use of "CredUIPromptForCredentials" or "CredUnPackAuthenticationBufferW".
Severity
Trouble
Rule Requirement
Criteria
Action1: actionname = "sa_imageloaded" AND (OBJECTNAME endswith "\credui.dll,\wincredui.dll" OR ORIGINALFILENAME = "credui.dll,wincredui.dll") AND (PROCESSNAME notstartswith "C:\Program Files (x86)\,C:\Program Files\,C:\Windows\System32\,C:\Windows\SysWOW64" AND PROCESSNAME != "C:\Windows\explorer.exe,C:\Windows\ImmersiveControlPanel\SystemSettings.exe,C:\Windows\regedit.exe") AND (PROCESSNAME notendswith "\opera_autoupdate.exe" AND PROCESSNAME notendswith "\procexp64.exe,\procexp.exe" AND (PROCESSNAME notstartswith "C:\Users" OR PROCESSNAME notcontains "\AppData\Local\Microsoft\Teams" OR PROCESSNAME notendswith "\Teams.exe") AND (PROCESSNAME notstartswith "C:\Users" OR PROCESSNAME notcontains "\AppData\Local\Microsoft\OneDrive")) select Action1.HOSTNAME,Action1.MESSAGE,Action1.PROCESSNAME,Action1.PRODUCT_NAME,Action1.OBJECTNAME
Detection
Execution Mode
realtime
Log Sources
Windows
Author
Roberto Rodriguez (Cyb3rWard0g), OTR (Open Threat Research)
