""ET TROJAN Kraken Stealer SMTP Data Exfiltration Attempt""

SID: 2045841

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_05_23, deployment Perimeter, malware_family Kraken_Stealer, performance_impact Low, confidence High, signature_severity Major, updated_at 2023_05_23

Reference:

  • md5

  • 5bc9ee4bec5e31f4ed64fefa92ef5f2b

Protocol: tcp

Source Network: $HOME_NET

Source Port: any

Destination Network: $EXTERNAL_NET

Destination Port: [25,465,587,691]

Flow: established,to_server

Contents:

  • Value: "Subject|3a 20 20|Recovered From|3a 20|"

  • Value: "Content-Type|3a 20|text/plain|3b 20|name|3d|RecoveredPassword.txt"

  • Value: "Content-Disposition|3a 20|attachment|0d 0a 0d 0a|"

  • Value: "IAB8AFMAeQBzAHQAZQBtACAASQBuAGYAbwB8AA0ACg"

Within:

PCRE:

Special Options:

  • fast_pattern

source