""ET TROJAN Downloader Retrieving Malicious Powershell in DNS Response""

SID: 2030315

Revision: 2

Class Type: trojan-activity

Metadata: attack_target Client_Endpoint, created_at 2020_06_11, deployment Perimeter, performance_impact Low, signature_severity Major, updated_at 2020_06_11

Reference:

Protocol: udp

Source Network: any

Source Port: 53

Destination Network: $HOME_NET

Destination Port: any

Flow:

Contents:

  • Value: "|00 10 00 01|"

Offset: 2

  • Value: "-match '@(.*)@'){$str +="

  • Value: "[System.Text.Encoding]::UTF8.GetString([System.Convert]::FromBase64String($matches[1]))}"

Within:

PCRE:

Special Options:

source