alert http1 $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Donot Group Downloader Activity (GET)"; flow:established,to_server; urilen:>20; http.method; content:"GET"; http.header_names; bsize:30; content:"|0d 0a|Accept|0d 0a|User-Agent|0d 0a|Host|0d 0a 0d 0a|"; http.accept; content:"|5c 5c 15 54 12|"; fast_pattern; endswith; reference:md5,8f2829a963c3b6f247ac77e0bf992bf1; classtype:trojan-activity; sid:2044208; rev:3; metadata:attack_target Client_Endpoint, created_at 2023_02_15, deployment Perimeter, deployment SSLDecrypt, malware_family DonotGroup, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_04_03; target:src_ip;)