alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET TROJAN Win32/Ketrican CnC? Activity"; flow:to_server,established; content:"POST"; http_method; content:".aspx?a1="; http_uri; fast_pattern; pcre:"/^[a-f0-9]{8}$/UR"; content:"AA"; depth:2; http_client_body; pcre:"/^(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{4})$/P"; http_content_len; content:"88"; metadata: former_category TROJAN; reference:url,www.welivesecurity.com/wp-content/uploads/2019/07/ESET_Okrum_and_Ketrican.pdf; reference:md5,e46d8f510c09f09e2e6b958b84190d8b; reference:md5,03a2f5ea0cea83e77770a4018c4469ab; classtype:trojan-activity; sid:2027728; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, deployment Perimeter, deployment SSLDecrypt, tag Ketrican, signature_severity Major, created_at 2019_07_18, updated_at 2019_07_18;)

Added 2019-07-19 18:58:54 UTC


Topic revision: r1 - 2019-07-19 - TWikiGuest
 
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