""ET TROJAN PurpleFox Backdoor/Rootkit Download Request M2""

SID: 2034871

Revision: 2

Class Type: trojan-activity

Metadata: attack_target Client_Endpoint, created_at 2022_01_07, deployment Perimeter, malware_family PurpleFox, performance_impact Moderate, signature_severity Major, updated_at 2022_01_07

Reference:

• md5

• 465dae978a41d566c7fabc9f5808487c

Protocol: tcp

Source Network: $HOME_NET

Source Port: any

Destination Network: $EXTERNAL_NET

Destination Port: !80

Flow: established,to_server

Contents:

• Value: "GET /" Depth: 5

• Value: ".zip?="

• Value: "|0d 0a|Accept|3a 20 2a 2f 2a 0d 0a|"

• Value: "|0d 0a|Accept-Encoding|3a 20|gzip|2c 20|deflate|0d 0a|User-Agent|3a 20|"

• Value: "|0d 0a|Host|3a 20|"

• Value: "Connection|3a 20|Keep-Alive|0d 0a|"

Within: 24

PCRE: "/^[0-9]{1,3}.[0-9]{1,3}.[0-9]{1,3}.[0-9]{1,3}\x3a\d{1,5}\x0d\x0a/R"

Special Options:

• fast_pattern

source