""ET TROJAN Ransomware Locky CnC Beacon 21 May""

SID: 2022952

Revision: 1

Class Type: trojan-activity

Metadata: attack_target Client_Endpoint, created_at 2016_07_06, deployment Perimeter, signature_severity Major, tag Locky, tag c2, updated_at 2016_07_06, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel

Reference:

• md5

• 6f8987e28fed878d08858a943e7c6e7c

Protocol: tcp

Source Network: $HOME_NET

Source Port: any

Destination Network: $EXTERNAL_NET

Destination Port: $HTTP_PORTS

Flow: established,to_server

Contents:

• Value: "POST"

• Value: "/_dispatch.php"

• Value: "www-form-urlencoded|0d 0a|"

• Value: "|0d 0a|x-requested-with|3a 20|XMLHttpRequest|0d 0a|"

Within:

PCRE: "/^[0-9a-zA-Z=%-]{0,48}(?:%[A-F0-9]{2}){4}/Psi"

Special Options:

• http_method

• fast_pattern

• http_header

• http_header

source