""ET TROJAN SysJoker User-Agent Observed""

SID: 2049304

Revision: 1

Class Type: trojan-activity

Metadata: affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2023_11_27, deployment Perimeter, confidence Medium, signature_severity Major, updated_at 2023_11_27

Reference:

• Link

Protocol: tcp

Source Network: $HOME_NET

Source Port: any

Destination Network: $EXTERNAL_NET

Destination Port: $HTTP_PORTS

Flow: established,to_server

Contents:

• Value: "User-Agent|3a 20|Mozilla|2f|5|2e|0|20 28|X11|3b 20|CrOS|20|x86|5f|64|20|8172|2e|45|2e|0|29 20|AppleWebKit|2f|537|2e|36|20 28|KHTML|2c 20|like|20|Gecko|29 20|Chrome|2f|51|2e|0|2e|2704|2e|64|20|Safari|2f|537|2e|36|0d 0a|"

Within:

PCRE:

Special Options:

• http_header

source