alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Gamaredon APT Related Maldoc Activity (GET)"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/sour/"; fast_pattern; content:".kdp"; endswith; http.user_agent; content:"|3b 20|ms-office|3b 20|"; http.header_names; to_lowercase; content:!"|0d 0a|referer|0d 0a|"; reference:md5,bb1c8ad9f422a39ce6329e93dc060438; reference:url,unit42.paloaltonetworks.com/gamaredon-primitive-bear-ukraine-update-2021/; classtype:trojan-activity; sid:2035169; rev:4; metadata:attack_target Client_Endpoint, created_at 2022_02_09, deployment Perimeter, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_04_26;)