""ET TROJAN Win32/Eris Ransomware CnC Checkin""

SID: 2027802

Revision: 3

Class Type: trojan-activity

Metadata: affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2019_08_05, deployment Perimeter, former_category MALWARE, malware_family Eris, signature_severity Major, tag Ransomware, updated_at 2022_03_24, mitre_tactic_id TA0040, mitre_tactic_name Impact, mitre_technique_id T1486, mitre_technique_name Data_Encrypted_for_Impact

Reference:

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: "/api/v1/check"

  • Value: "Accept-Encoding|3a 20|gzip|0d 0a|"

  • Value: "|7b 22 75 69 64 22 3a 22|" Depth: 8

  • Value: "|22 7d|"

  • Value: !"Referer|3a|"

Within:

PCRE: "/^{\x22uid\x22\x3a\x22[a-f0-9]+\x22}$/Psi"

Special Options:

  • http_method

  • http_uri

  • fast_pattern

  • http_header

  • http_client_body

  • http_client_body

  • http_header

source