""ET TROJAN BlueShtorm Infostealer Data Exfiltration""

SID: 2036610

Revision: 4

Class Type: trojan-activity

Metadata: attack_target Client_Endpoint, created_at 2022_05_17, deployment Perimeter, malware_family BlueShtorm_Stealer, performance_impact Low, signature_severity Major, updated_at 2023_08_22, reviewed_at 2023_08_21

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: "/upload.php"

  • Value: "filename|3d 22|Log.zip|22 0d 0a|"

  • Value: "PK|03 04|"

  • Value: "System Info.txt"

Within:

PCRE: "/^Content-Type\x3a\x20[^\r\n]+\r\nHost\x3a\x20[^\r\n]+\r\nContent-Length\x3a\x20[^\r\n]+\r\nExpect\x3a\x20[^\r\n]+\r\nConnection\x3a\x20[^\r\n]+[\r\n]+$/H"

Special Options:

  • http_method

  • http_uri

  • http_client_body

  • fast_pattern

  • http_client_body

  • http_client_body

source