""ET TROJAN Buer Loader Update Request""

SID: 2029077

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 2019_11_12, deployment Perimeter, malware_family BuerLoader, signature_severity Major, updated_at 2019_11_12

Reference:

  • md5

  • a8819db1fa758fd9f1d501dbb50f454f

Protocol: tcp

Source Network: $HOME_NET

Source Port: any

Destination Network: $EXTERNAL_NET

Destination Port: $HTTP_PORTS

Flow: established,to_server

Contents:

  • Value: "GET"

  • Value: "/api/update/" Depth: 12

  • Value: "User-Agent|3a 20|Mozilla/5.0 (Windows NT 10.0|3b 20|Win64|3b 20|x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/60.0.3112.113 Safari/537.36"

  • Value: !"Accept"

  • Value: !"Referer"

Within:

PCRE: "/^\/api\/update\/(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{4})$/U"

Special Options:

  • http_method

  • http_uri

  • http_header

  • http_header

  • http_header

source