""ET POLICY Suspicious User-Agent Containing .exe""

SID: 2013224

Revision: 15

Class Type: trojan-activity

Metadata: affected_product Any, attack_target Client_Endpoint, created_at 2011_07_07, deployment Perimeter, signature_severity Informational, tag User_Agent, updated_at 2016_12_29

Reference:

Protocol: tcp

Source Network: $HOME_NET

Source Port: any

Destination Network: $EXTERNAL_NET

Destination Port: $HTTP_PORTS

Flow: to_server,established

Contents:

  • Value: ".exe|0d 0a|"

  • Value: !"|5C|Citrix|5C|ICA Client|5C|"

  • Value: !"vsee.exe|0d 0a|"

  • Value: !"CTX_"

  • Value: !"gfi.com|0d 0a|"

  • Value: !"pandasoftware.com"

  • Value: !"lnssatt.exe"

Within:

PCRE: "/User-Agent\x3a[^\n]+.exe/iH"

Special Options:

  • http_header

  • nocase

  • nocase

  • http_header

  • nocase

  • http_header

  • http_uri

  • http_header

  • http_header

  • http_header

source