""ET TROJAN Win32/keyzetsu Stealer Variant Exfil via Telegram (Response)""

SID: 2044693

Revision: 1

Class Type: trojan-activity

Metadata: attack_target Client_Endpoint, created_at 2023_03_20, deployment Perimeter, deployment SSLDecrypt, performance_impact Low, confidence High, signature_severity Major, updated_at 2023_03_20

Reference:

Protocol: tcp

Source Network: $EXTERNAL_NET

Source Port: $HTTP_PORTS

Destination Network: $HOME_NET

Destination Port: any

Flow: established,to_client

Contents:

  • Value: "|7b 22 6f 6b 22 3a 74 72 75 65 2c 22 72 65 73 75 6c 74 22 3a|" Depth: 20

  • Value: "|2c 22 75 73 65 72 6e 61 6d 65 22 3a 22 64 61 6d 61 68|"

  • Value: "|5f 62 6f 74 22 7d 2c 22 63 68 61 74 22 3a 7b 22 69 64 22 3a|"

Within: 20

PCRE:

Special Options:

  • file_data

  • fast_pattern

source