""ET TROJAN Observed Koadic Header Structure""

SID: 2030341

Revision: 2

Class Type: trojan-activity

Metadata: affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2020_06_15, deployment Perimeter, malware_family Koadic, signature_severity Major, updated_at 2020_06_15

Reference:

  • md5

  • 1e1afc93c8092b2c7e49a6d3a451629f

Protocol: tcp

Source Network: $HOME_NET

Source Port: any

Destination Network: $EXTERNAL_NET

Destination Port: $HTTP_PORTS

Flow: established,to_server

Contents:

  • Value: "|0d 0a|encoder|3a 20|"

  • Value: "|0d 0a|shellchpc|3a 20|"

  • Value: !"Referer|3a|"

Within:

PCRE:

Special Options:

  • http_header

  • http_header

  • fast_pattern

  • http_header

source