""ET TROJAN MSIL/Agent.DNL Server Response Task (whoami)""

SID: 2033744

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 2021_08_19, deployment Perimeter, signature_severity Major, updated_at 2021_08_19

Reference:

Protocol: tcp

Source Network: $EXTERNAL_NET

Source Port: $HTTP_PORTS

Destination Network: $HOME_NET

Destination Port: any

Flow: established,to_client

Contents:

  • Value: "Content-Type|3a 20|application/json|3b|"

  • Value: "Date|3a 20|"

  • Value: "Content-Length|3a 20|22|0d 0a|"

  • Value: !"User-Agent|3a 20|"

  • Value: "|7b 22|command|22 3a 22|d2hvYW1p|22 7d|" Depth: 22

Within:

PCRE: "/^Content-Type\x3a\x20[^\r\n]+\r\nDate\x3a\x20[^\r\n]+\r\nContent-Length\x3a\x20[^\r\n]+[\r\n]+$/H"

Special Options:

  • http_header

  • http_header

  • http_header

  • http_header

  • file_data

  • fast_pattern

source