Versions (3)
Version DetailsCurrent
Rev: 5 • Apr 8, 2022, 12:00 PMET MALWARE Base64 Encoded Stealer Config from Server - APPDATA or USERPROFILE Environment Variable M2
alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE Base64 Encoded Stealer Config from Server - APPDATA or USERPROFILE Environment Variable M2"; flow:established,to_client; http.stat_code; content:"200"; http.response_body; content:"MHwxf"; startswith; fast_pattern; content:"f"; distance:7; within:1; base64_decode:bytes 250; base64_data; pcre:"/%(?:USERPROFILE|APPDATA)%/i"; reference:url,blog.malwarebytes.com/threat-intelligence/2022/04/colibri-loader-combines-task-scheduler-and-powershell-in-clever-persistence-technique; reference:md5,bb41fbddc48fc3548d55a6ad9c321832; reference:md5,1cde32d54a0f0f2ddad79d7df6a7419f; classtype:command-and-control; sid:2035882; rev:5; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2022_04_08, deployment Perimeter, deployment SSLDecrypt, performance_impact Low, confidence High, signature_severity Major, updated_at 2022_04_21;)
Apr 8, 2022, 12:00 PM
Apr 21, 2022, 12:00 PM
Sep 21, 2024, 3:00 AM
May 30, 2025, 12:04 AM
rules/emerging-malware.rules