""ET TROJAN Linux/B1txor20 Backdoor Connectivity Check""

SID: 2035526

Revision: 2

Class Type: trojan-activity

Metadata: affected_product Linux, attack_target Client_Endpoint, created_at 2022_03_18, deployment Perimeter, deployment Internal, malware_family B1txor20, performance_impact Low, signature_severity Major, updated_at 2022_03_18

Reference:

• Link

Protocol: udp

Source Network: $HOME_NET

Source Port: any

Destination Network: any

Destination Port: 53

Flow:

Contents:

• Value: "|01|" Depth: 1 Offset: 2

• Value: "|00 01 00 00 00 00 00|"

• Value: "|06 67 6f 6f 67 6c 65 03 63 6f 6d 00 00 00 00 01|"

Within: 16

PCRE:

Special Options:

• fast_pattern

source