alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE ELF/Miner Loader Activity M2 (GET)"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/.sherifu/"; startswith; fast_pattern; pcre:"/^\.(?:93joshua|purrple|black)$/"; http.user_agent; content:"curl/"; startswith; http.header_names; content:!"Referer"; reference:url,www.bitdefender.com/blog/labs/how-we-tracked-a-threat-group-running-an-active-cryptojacking-campaign; classtype:trojan-activity; sid:2033368; rev:1; metadata:affected_product Linux, attack_target Linux_Unix, created_at 2021_07_21, deployment Perimeter, malware_family ELF_Miner, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_07_21;)