""ET TROJAN Koadic CnC Exfiltration (POST)""

SID: 2052621

Revision: 1

Class Type: trojan-activity

Metadata: affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, tls_state plaintext, created_at 2024_05_15, deployment Perimeter, malware_family Koadic, confidence High, signature_severity Critical, tag RAT, updated_at 2024_05_15

Reference:

Protocol: tcp

Source Network: $HOME_NET

Source Port: any

Destination Network: $EXTERNAL_NET

Destination Port: 1024:

Flow: established,to_server

Contents:

  • Value: "POST"

  • Value: "|2f|"

  • Value: "User-Agent|3a 20|Mozilla|2f|5|2e|0|20 28|compatible|3b 20|MSIE|20|8|2e|0|3b 20|Windows|20|NT|20|5|2e|1|3b 20|Trident|2f|4|2e|0|3b 20 2e|NET|20|CLR|20|1|2e|1|2e|4322|3b 20 2e|NET|20|CLR|20|2|2e|0|2e|50727|29 0d 0a|"

  • Value: "session=" Depth: 8

  • Value: "|0d 0a|Cookie|3a 20|session="

Within:

PCRE: "/^session\x3d[a-z0-9]{32}$/C"

Special Options:

  • http_method

  • http_uri

  • http_header

  • http_cookie

  • fast_pattern

source