""ET TROJAN Subterranean Crimson Rat - AssignID Command""

SID: 2035070

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 2022_02_03, deployment Perimeter, malware_family Subterranean_Crimson, signature_severity Major, tag RAT, updated_at 2022_02_03

Reference:

• Link

Protocol: tcp

Source Network: $EXTERNAL_NET

Source Port: any

Destination Network: $HOME_NET

Destination Port: any

Flow: established,to_client

Contents:

• Value: "crimson.universal.containers.Message"

• Value: "CLIENT_assignID"

• Value: "|00|"

Within: 4

PCRE: "/^.\d{1,2}.\d+.\d+/R"

Special Options:

• nocase

• fast_pattern

source