""ET TROJAN MSIL/Hidden-Tear Variant Ransomware CnC Checkin""

SID: 2024204

Revision: 1

Class Type: trojan-activity

Metadata: affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2017_04_12, deployment Perimeter, malware_family Ransomware, malware_family Hidden_Tear, signature_severity Major, tag Ransomware, updated_at 2017_04_12, mitre_tactic_id TA0040, mitre_tactic_name Impact, mitre_technique_id T1486, mitre_technique_name Data_Encrypted_for_Impact

Reference:

• md5

• b991a99335b01bed8da4401fee1f2d45

Protocol: tcp

Source Network: $HOME_NET

Source Port: any

Destination Network: $EXTERNAL_NET

Destination Port: $HTTP_PORTS

Flow: established,to_server

Contents:

• Value: ".php?rid=ClsgIFVzZXItSUQgIF0gID"

• Value: "Ransom|3a 20|Client|0d 0a|"

• Value: !"User-Agent|3a|"

• Value: !"Referer|3a|"

Within:

PCRE: "/.php\?rid=(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{4})$/Ui"

Special Options:

• http_uri

• fast_pattern

• http_header

• http_header

• http_header

source