alert tcp $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE Win32/Sharik C2 Incoming Traffic"; flow:established,from_server; dsize:18; content:"|0d 00 07 01 00 81 7c e4 04 c0 d4 01 00 19 c0 c2 04 00|"; fast_pattern; reference:md5,f9f30307ca22d092c02701c108aa6402; classtype:command-and-control; sid:2018615; rev:2; metadata:created_at 2014_06_30, malware_family Win32_Sharik, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_10_08;)