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1. (WO1999013402) COMPUTER NETWORK MALICIOUS CODE SCANNER

Pub. No.:    WO/1999/013402    International Application No.:    PCT/US1998/015807
Publication Date: Mar 18, 1999 International Filing Date: Aug 14, 1998
IPC: G06F 1/00
G06F 21/00
H04L 29/06
Applicants: TREND MICRO, INC.
Inventors: JI, Shuang
Title: COMPUTER NETWORK MALICIOUS CODE SCANNER
Abstract:
A network scanner (26) for security checking of application programs (e.g. Java applets or Active X controls) received over the Internet or an Intranet (10) has both static (pre-run time) and dynamic (run time) scanning. Static scanning at the HTTP proxy server (32) identifies suspicious instructions and instruments them e.g. a pre-and post-filter instruction sequence or otherwise. The instrumented applet is then transferred to the client (14) (web browser (22)) together with security monitoring code. During run time at the client (14), the instrumented instructions are thereby monitored for security policy violations, and execution of an instruction is prevented in the event of such a violation.