Suspicious Curl.EXE Download
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About the rule
Rule Type
Standard
Rule Description
Detects a suspicious curl process start on Windows and outputs the requested document to a local file
Severity
Trouble
Rule Requirement
Criteria
Action1: actionname = "Process started" AND (PROCESSNAME endswith "\curl.exe" OR PRODUCT_NAME = "The curl executable") AND (COMMANDLINE contains "%AppData%,%Public%,%Temp%,%tmp%,\AppData\,\Desktop\,\Temp\,\Users\Public\,C:\PerfLogs\,C:\ProgramData\,C:\Windows\Temp" OR COMMANDLINE endswith ".dll,.gif,.jpeg,.jpg,.png,.temp,.tmp,.txt,.vbe,.vbs") AND (PARENTPROCESSNAME != "C:\Program Files\Git\usr\bin\sh.exe" OR PROCESSNAME != "C:\Program Files\Git\mingw64\bin\curl.exe" OR (COMMANDLINE notcontains "--silent --show-error --output " OR COMMANDLINE notcontains "gfw-httpget-" OR COMMANDLINE notcontains "AppData")) select Action1.HOSTNAME,Action1.MESSAGE,Action1.COMMANDLINE,Action1.FILE_NAME,Action1.PROCESSNAME,Action1.USERNAME,Action1.PARENTPROCESSNAME
Detection
Execution Mode
realtime
Log Sources
Windows
Author
Florian Roth (Nextron Systems), Nasreddine Bencherchali (Nextron Systems)
