alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET CURRENT_EVENTS Inbound PowerShell? Saving Base64 Decoded Payload to Temp M1 2018-11-29"; flow:established,from_server; content:"200"; http_stat_code; file_data; content:"|3a 3a|FromBase64String|28|"; nocase; content:"Set-Content"; distance:0; nocase; content:"C|3a 5c|Windows|5c|Temp"; distance:0; nocase; fast_pattern; content:"-Encoding"; distance:0; nocase; content:"|0a 0a 0a|"; pcre:"/^(?P\$[a-z0-9]{1,15})\s*=\s*\[System\.Text\.Encoding\]::ASCII\.GetString\(\[System\.Convert\]::FromBase64String\((?P=js)\)\)\s*Set-Content\s*(?:-Path\s*C:\\Windows\\Temp\\[a-z0-9]{1,15}\.[a-z0-9]{2,4}\s*|-Value\s*(?P=js)\s*|-Encoding\s*ASCII){3}/Ri"; metadata: former_category CURRENT_EVENTS; reference:url,www.clearskysec.com/muddywater-operations-in-lebanon-and-oman/; classtype:trojan-activity; sid:2026675; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, deployment Perimeter, tag PowerShell?, tag Obfuscated, signature_severity Major, created_at 2018_11_29, performance_impact Low, updated_at 2018_11_29;)

Added 2018-11-29 18:26:31 UTC


Topic revision: r1 - 2018-11-29 - TWikiGuest
 
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