Indirect Command Execution From Script File Via Bash.EXE
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In this page
About the rule
Rule Type
Standard
Rule Description
Detects execution of Microsoft bash launcher without any flags to execute the content of a bash script directly. This can be used to potentially bypass defenses and execute Linux or Windows-based binaries directly via bash.
Severity
Trouble
Rule Requirement
Criteria
Action1: actionname = "Process started" AND (PROCESSNAME endswith ":\Windows\System32\bash.exe,:\Windows\SysWOW64\bash.exe" OR ORIGINALFILENAME = "Bash.exe") AND (COMMANDLINE notcontains "bash.exe -,bash -" AND isExist(COMMANDLINE) AND COMMANDLINE != "" AND COMMANDLINE != "bash.exe,bash") select Action1.HOSTNAME,Action1.MESSAGE,Action1.COMMANDLINE,Action1.FILE_NAME,Action1.PROCESSNAME,Action1.USERNAME,Action1.PARENTPROCESSNAME
Detection
Execution Mode
realtime
Log Sources
Windows
Author
Nasreddine Bencherchali (Nextron Systems)
