ET MALWARE Zberp/ZeusVM receiving config via image file (steganography)

Query · suricata

flow:from_server,established;
flowbits:isset,ET.Zberp;
file_data;
content:"|ff fe 3f 10 00 00|"; distance:0;
byte_test:4,>,100,4,relative,little;
byte_extract:4,4,config_len,relative,little;
content:!"|00|"; within:config_len;
pcre:"/^[^\x00]+(\xff\xd9)?$/R";

Rule dependencies

⚠ Higher-order rule. It fires on other rules' alerts, not on raw events, so it cannot fire on its own. Deploy the rules it depends on too.

Depends on

Raw source ET MALWARE Zberp/ZeusVM receiving config via image file (steganography) · Suricata
Esc
Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert http $EXTERNAL_NET any -> $HOME_NET any (
    msg:"ET MALWARE Zberp/ZeusVM receiving config via image file (steganography)";
    flow:from_server,established;
    flowbits:isset,ET.Zberp;
    file_data;
    content:"|ff fe 3f 10 00 00|"; distance:0;
    byte_test:4,>,100,4,relative,little;
    byte_extract:4,4,config_len,relative,little;
    content:!"|00|"; within:config_len;
    pcre:"/^[^\x00]+(\xff\xd9)?$/R";
    reference:md5,1e1f44f8a403c4ebc6943eb2dcf731ff;
    reference:url,securityintelligence.com/new-zberp-trojan-discovered-zeus-zbot-carberp/#.U5Xgpyh4l8u;
    reference:url,blog.malwarebytes.org/security-threat/2014/02/hiding-in-plain-sight-a-story-about-a-sneaky-banking-trojan/;
    classtype:trojan-activity;
    sid:2021382; rev:11;
    metadata:created_at 2015_07_06, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;
)

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