alert http1 $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE PeepingTitle Backdoor Related Activity"; flow:established,to_server; http.method; content:"GET"; http.uri; pcre:"/\.(?:(cdr|zip|ppt|msf|jpeg|sql))$/"; http.user_agent; bsize:4; content:"calc"; fast_pattern; http.header_names; bsize:22; content:"|0d 0a|User-Agent|0d 0a|Host|0d 0a 0d 0a|"; reference:url,www.sentinelone.com/labs/operation-magalenha-long-running-campaign-pursues-portuguese-credentials-and-pii/; reference:md5,5ffe427533794819a0a949a7eb168201; classtype:trojan-activity; sid:2048312; rev:3; metadata:attack_target Client_Endpoint, created_at 2023_09_27, deployment Perimeter, deployment SSLDecrypt, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_04_03, reviewed_at 2023_09_27; target:src_ip;)