Load Of RstrtMgr.DLL By An Uncommon Process
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About the rule
Rule Type
Standard
Rule Description
Detects the load of RstrtMgr DLL (Restart Manager) by an uncommon process. This library has been used during ransomware campaigns to kill processes that would prevent file encryption by locking them (e.g. Conti ransomware, Cactus ransomware). It has also recently been seen used by the BiBi wiper for Windows. It could also be used for anti-analysis purposes by shut downing specific processes.
Severity
Attention
Rule Requirement
Criteria
Action1: actionname = "sa_imageloaded" AND (OBJECTNAME endswith "\RstrtMgr.dll" OR ORIGINALFILENAME = "RstrtMgr.dll") AND (PROCESSNAME notcontains ":\$WINDOWS.~BT\,:\$WinREAgent\,:\Program Files (x86)\,:\Program Files\,:\ProgramData\,:\Windows\explorer.exe,:\Windows\SoftwareDistribution\,:\Windows\SysNative\,:\Windows\System32\,:\Windows\SysWOW64\,:\Windows\WinSxS\,:\WUDownloadCache" AND ((PROCESSNAME notcontains ":\Users" OR PROCESSNAME notcontains "\AppData\Local\Temp\is-" OR PROCESSNAME notcontains ".tmp") OR PROCESSNAME notendswith ".tmp") AND PROCESSNAME notcontains ":\Windows\Temp") select Action1.HOSTNAME,Action1.MESSAGE,Action1.PROCESSNAME,Action1.PRODUCT_NAME,Action1.OBJECTNAME
Detection
Execution Mode
realtime
Log Sources
Windows
Author
Luc Génaux
