ET MALWARE BACKCONFIG CnC Downloader Activity

Query · suricata

flow:established,to_server;
http.uri;
content:"/request/httpsrequest"; bsize:21; fast_pattern;
http.host;
pcre:"/^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$/";
http.header;
content:!"Referer";
Raw source ET MALWARE BACKCONFIG CnC Downloader Activity · Suricata
Esc
Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE BACKCONFIG CnC Downloader Activity";
    flow:established,to_server;
    http.uri;
    content:"/request/httpsrequest"; bsize:21; fast_pattern;
    http.host;
    pcre:"/^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$/";
    http.header;
    content:!"Referer";
    reference:url,unit42.paloaltonetworks.com/updated-backconfig-malware-targeting-government-and-military-organizations;
    classtype:trojan-activity;
    sid:2030165; rev:1;
    metadata:attack_target Client_Endpoint, created_at 2020_05_13, deployment Perimeter, malware_family APT_HANGOVER, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_05_13;
)

Detection rules belong to the projects that publish them and remain under their own licenses. This site indexes and links to them; it claims no rights in them.