alert tcp $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE SystemBC Powershell bot registration"; flow:established,to_server; dsize:100; content:"|00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f 10 11 12 13 14 15 16 17 18 19 1a 1b 1c 1d 1e 1f 20 21 22 23 24 25 26 27 28 29 2a 2b 2c 2d 2e 2f 30 31|"; offset:0; depth:50; reference:md5,d1fb59de13a2394622c84aca8d963071; reference:url,medium.com/walmartglobaltech/systembc-powershell-version-68c9aad0f85c; classtype:command-and-control; sid:2035399; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2022_03_07, deployment Perimeter, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_03_07;)