alert tcp $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/Kumquat Loader Activity (Connect)"; flow:established,to_server; flowbits:set,ET.kumquat; flowbits:noalert; content:"MQIsdp|03|"; fast_pattern; offset:4; depth:7; content:"|00 26|"; distance:3; within:2; pcre:"/^{(?:[0-9a-f]{8})-(?:[0-9a-f]{4})-(?:[0-9a-f]{4})-(?:[0-9a-f]{4})-(?:[0-9a-f]{12})}$/R"; reference:md5,5e68e2c7b87e0c23904987e694f5b1ee; reference:md5,bff4ce3dbda522e92970c5d1d0471e63; classtype:trojan-activity; sid:2044066; rev:2; metadata:attack_target Client_Endpoint, created_at 2023_02_02, deployment Perimeter, malware_family Kumquat, confidence High, signature_severity Major, tag TA416, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_10_11, reviewed_at 2024_04_09; target:src_ip;)