alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/Chekafe.A or Related Infection Checkin"; flow:established,to_server; http.uri; content:"isInst="; content:"lockcode="; content:"PcType="; content:"AvName="; content:"ProCount="; reference:url,www.microsoft.com/security/portal/Threat/Encyclopedia/Entry.aspx?Name=TrojanDownloader%3AWin32/Chekafe.A; classtype:command-and-control; sid:2011272; rev:6; metadata:created_at 2010_07_30, malware_family Win32_Chekafe_A, signature_severity Major, updated_at 2020_04_21;)