Versions (4)
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Rev: 3 • Jul 31, 2018, 12:00 PMET MALWARE Win32/Bisonal RC4 Encrypted 8 Byte Static CnC Checkin
alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/Bisonal RC4 Encrypted 8 Byte Static CnC Checkin"; flow:established,to_server; urilen:<100; http.method; content:"POST"; http.request_body; content:"|81 b2 a8 97 7e a3 1b 91|"; depth:8; fast_pattern; endswith; http.header_names; content:!"Referer"; content:!"Accept"; reference:md5,CC71620DE7216B186DA2C9BA06703613; reference:url,researchcenter.paloaltonetworks.com/2018/07/unit42-bisonal-malware-used-attacks-russia-south-korea/; classtype:command-and-control; sid:2025923; rev:3; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2018_07_31, deployment Perimeter, malware_family Bisonal, performance_impact Low, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_09_16;)
Jul 31, 2018, 12:00 PM
Sep 16, 2020, 12:00 PM
Sep 21, 2024, 3:00 AM
Sep 29, 2025, 9:34 PM
rules/emerging-malware.rules