Self Extracting Package Creation Via Iexpress.EXE From Potentially Suspicious Location
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About the rule
Rule Type
Standard
Rule Description
Detects the use of iexpress.exe to create binaries via Self Extraction Directive (SED) files located in potentially suspicious locations. This behavior has been observed in-the-wild by different threat actors.
Severity
Trouble
Rule Requirement
Criteria
Action1: actionname = "Process started" AND (PROCESSNAME endswith "\iexpress.exe" OR ORIGINALFILENAME = "IEXPRESS.exe") AND COMMANDLINE contains " -n , /n , –n , —n , ―n " AND COMMANDLINE contains ":\ProgramData\,:\Temp\,:\Windows\System32\Tasks\,:\Windows\Tasks\,:\Windows\Temp\,\AppData\Local\Temp" select Action1.HOSTNAME,Action1.MESSAGE,Action1.COMMANDLINE,Action1.FILE_NAME,Action1.PROCESSNAME,Action1.USERNAME,Action1.PARENTPROCESSNAME
Detection
Execution Mode
realtime
Log Sources
Windows
Author
Joseliyo Sanchez, @Joseliyo_Jstnk, Nasreddine Bencherchali (Nextron Systems)
