alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET CURRENT_EVENTS Possible AMSI Powershell Bypass Attempt"; flow:established,from_server; file_data; content:"<script"; nocase; content:"powershell"; nocase; distance:0; content:"System.Management.Automation.AmsiUtils"; fast_pattern; nocase; content:"amsiInitFailed"; nocase; content:"setvalue"; nocase; content:"$null"; nocase; distance:0; content:"$true"; nocase; distance:0; metadata: former_category CURRENT_EVENTS; classtype:trojan-activity; sid:2024537; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, deployment Perimeter, signature_severity Major, created_at 2017_08_11, updated_at 2017_08_11;)

Added 2017-08-11 17:37:22 UTC

Topic revision: r1 - 2017-08-11 - TWikiGuest
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