Suspicious Obfuscated PowerShell Code
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About the rule
Rule Type
Standard
Rule Description
Detects suspicious UTF16 and base64 encoded and often obfuscated PowerShell code often used in command lines
Severity
Trouble
Rule Requirement
Criteria
Action1: actionname = "Process started" AND COMMANDLINE contains "IAAtAGIAeABvAHIAIAAwAHgA,AALQBiAHgAbwByACAAMAB4A,gAC0AYgB4AG8AcgAgADAAeA,AC4ASQBuAHYAbwBrAGUAKAApACAAfAAg,AuAEkAbgB2AG8AawBlACgAKQAgAHwAI,ALgBJAG4AdgBvAGsAZQAoACkAIAB8AC,AHsAMQB9AHsAMAB9ACIAIAAtAGYAI,B7ADEAfQB7ADAAfQAiACAALQBmAC,AewAxAH0AewAwAH0AIgAgAC0AZgAg,AHsAMAB9AHsAMwB9ACIAIAAtAGYAI,B7ADAAfQB7ADMAfQAiACAALQBmAC,AewAwAH0AewAzAH0AIgAgAC0AZgAg,AHsAMgB9AHsAMAB9ACIAIAAtAGYAI,B7ADIAfQB7ADAAfQAiACAALQBmAC,AewAyAH0AewAwAH0AIgAgAC0AZgAg,AHsAMQB9AHsAMAB9ACcAIAAtAGYAI,B7ADEAfQB7ADAAfQAnACAALQBmAC,AewAxAH0AewAwAH0AJwAgAC0AZgAg,AHsAMAB9AHsAMwB9ACcAIAAtAGYAI,B7ADAAfQB7ADMAfQAnACAALQBmAC,AewAwAH0AewAzAH0AJwAgAC0AZgAg,AHsAMgB9AHsAMAB9ACcAIAAtAGYAI,B7ADIAfQB7ADAAfQAnACAALQBmAC,AewAyAH0AewAwAH0AJwAgAC0AZgAg" 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)
