alert http1 $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Spark RAT CnC Checkin (POST)"; flow:established,to_server; http.method; content:"POST"; http.uri; content:"|2f|api|2f|client|2f|update|3f|arch|3d|"; startswith; fast_pattern; pcre:"/^(?:386|amd64)/R"; content:"&commit="; within:8; pcre:"/^(?:[a-z0-9]{40})/R"; content:"&os="; within:4; pcre:"/^(?:linux|windows)$/R"; http.host; pcre:"/^(?:[0-9]{1,3}\.){3}[0-9]{1,3}$/"; http.content_len; bsize:3; content:"384"; http.content_type; bsize:24; content:"application|2f|octet|2d|stream"; http.accept_enc; bsize:4; content:"gzip"; http.header; content:"|0d 0a|Secret|3a 20|"; pcre:"/^(?:[a-z0-9]{40})/R"; http.header_names; bsize:77; content:"|0d 0a|Host|0d 0a|User-Agent|0d 0a|Content-Length|0d 0a|Content-Type|0d 0a|Secret|0d 0a|Accept-Encoding|0d 0a 0d 0a|"; reference:md5,9bcae60b3c1a483b8c233b575aad3f41; reference:url,twitter.com/suyog41/status/1693563144617206147; classtype:trojan-activity; sid:2047681; rev:3; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, affected_product Linux, attack_target Client_Endpoint, created_at 2023_08_21, deployment Perimeter, malware_family SparkRAT, confidence High, signature_severity Critical, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_04_03, reviewed_at 2023_08_21;)