Suspicious MSExchangeMailboxReplication ASPX Write
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About the rule
Rule Type
Standard
Rule Description
Detects suspicious activity in which the MSExchangeMailboxReplication process writes .asp and .apsx files to disk, which could be a sign of ProxyShell exploitation
Severity
Trouble
Rule Requirement
Criteria
Action1: actionname = "File Created or Modified" AND PROCESSNAME endswith "\MSExchangeMailboxReplication.exe" AND (FILENAME endswith ".aspx,.asp" OR OBJECTNAME endswith ".aspx,.asp") select Action1.HOSTNAME,Action1.MESSAGE,Action1.USERNAME,Action1.DOMAIN,Action1.OBJECTNAME,Action1.FILENAME,Action1.PROCESSNAME
Detection
Execution Mode
realtime
Log Sources
Windows
Author
Florian Roth (Nextron Systems)
