alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET USER_AGENTS Observed DPRK Related APT User-Agent (dafom)"; flow:established,to_server; http.user_agent; content:"dafom"; bsize:5; fast_pattern; reference:url,www.cisa.gov/uscert/ncas/current-activity/2022/04/18/north-korean-state-sponsored-apt-targets-blockchain-companies; classtype:bad-unknown; sid:2036260; rev:1; metadata:attack_target Client_Endpoint, created_at 2022_04_19, deployment Perimeter, deployment SSLDecrypt, confidence High, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_04_19;)