alert tcp $HOME_NET !80 -> $EXTERNAL_NET [!5721,!5938] (msg:"ET MALWARE Backdoor family PCRat/Gh0st CnC traffic"; flow:established,to_server; stream_size:server,<,5; dsize:>11; content:"|78 9c|"; offset:8; byte_jump:4,-10,relative,little,from_beginning,post_offset -1; isdataat:!2,relative; content:!"PWHDR"; depth:5; reference:url,www.securelist.com/en/descriptions/10155706/Trojan-GameThief.Win32.Magania.eogz; reference:url,www.microsoft.com/security/portal/Threat/Encyclopedia/Entry.aspx?Name=Backdoor%3AWin32%2FPcClient.ZR&ThreatID=-2147325231; reference:url,labs.alienvault.com/labs/index.php/2012/new-macontrol-variant-targeting-uyghur-users-the-windows-version-using-gh0st-rat/; reference:url,blogs.rsa.com/will-gragido/lions-at-the-watering-hole-the-voho-affair/; reference:url,www.norman.com/about_norman/press_center/news_archive/2012/the_many_faces_of_gh0st_rat/en; classtype:command-and-control; sid:2016922; rev:15; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2013_04_23, deployment Perimeter, malware_family Gh0st, malware_family PCRAT, confidence Medium, signature_severity Critical, tag PCRAT, tag Gh0st, tag RAT, updated_at 2021_09_09;)