""ET TROJAN Win32/TA402 CnC User-Agent""

SID: 2049153

Revision: 1

Class Type: trojan-activity

Metadata: attack_target Client_and_Server, created_at 2023_08_16, deployment Perimeter, deployment SSLDecrypt, performance_impact Low, confidence High, signature_severity Critical, tag TA402, updated_at 2023_11_13, reviewed_at 2023_08_16, former_sid 2855109

Reference:

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|Windows|20|NT|20|10|2e|0|3b 20|Win64|3b 20|x64|3b 20|rv|3a|"

• Value: "|29 20|Gecko|2f|"

• Value: "Firefox|2f|3|2e|15|0d 0a|"

Within: 13

PCRE: "/^User-Agent\x3a\x20Mozilla\x2f5\x2e0\x20\x28Windows\x20NT\x2010\x2e0\x3b\x20Win64\x3b\x20x64\x3b\x20rv\x3a\d{2,3}\x2e\d{1,3}\x2e\d{4}\x2e\d{2,3}\x29\x20Gecko\x2f\d{2,3}\x2e\d{1,3}\x2e\d{4}\x2e\d{2,3}\x20Firefox\x2f3\x2e15[\r\n]+$/Hm"

Special Options:

• fast_pattern

source