""ET TROJAN APT33/CharmingKitten Encrypted Payload Inbound""

SID: 2026578

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 2018_11_05, deployment Perimeter, performance_impact Low, signature_severity Major, tag APT33, tag CharmingKitten, updated_at 2018_11_05

Reference:

• md5

• 9881bccf12fd8ae71a03247d2ad61a06

Protocol: tcp

Source Network: $EXTERNAL_NET

Source Port: $HTTP_PORTS

Destination Network: $HOME_NET

Destination Port: any

Flow: established,from_server

Contents:

• Value: "200"

• Value: "|0d 0a|CacheControl|3a 20|"

Within:

PCRE: "/^(?:[A-Z0-9+\/]{4})*(?:[A-Z0-9+\/]{2}==|[A-Z0-9+\/]{3}=|[A-Z0-9+\/]{4})$/i"

Special Options:

• http_stat_code

• http_header

• fast_pattern

• file_data

source