JP4778950B2 - コンピュータ・ネットワーク用のウイルス検出・除去装置 - Google Patents
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- JP4778950B2 JP4778950B2 JP2007327067A JP2007327067A JP4778950B2 JP 4778950 B2 JP4778950 B2 JP 4778950B2 JP 2007327067 A JP2007327067 A JP 2007327067A JP 2007327067 A JP2007327067 A JP 2007327067A JP 4778950 B2 JP4778950 B2 JP 4778950B2
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L63/00—Network architectures or network communication protocols for network security
- H04L63/14—Network architectures or network communication protocols for network security for detecting or protecting against malicious traffic
- H04L63/1441—Countermeasures against malicious traffic
- H04L63/145—Countermeasures against malicious traffic the attack involving the propagation of malware through the network, e.g. viruses, trojans or worms
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F21/00—Security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
- G06F21/50—Monitoring users, programs or devices to maintain the integrity of platforms, e.g. of processors, firmware or operating systems
- G06F21/55—Detecting local intrusion or implementing counter-measures
- G06F21/56—Computer malware detection or handling, e.g. anti-virus arrangements
- G06F21/562—Static detection
- G06F21/564—Static detection by virus signature recognition
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L51/00—User-to-user messaging in packet-switching networks, transmitted according to store-and-forward or real-time protocols, e.g. e-mail
- H04L51/21—Monitoring or handling of messages
- H04L51/212—Monitoring or handling of messages using filtering or selective blocking
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
- H04L9/40—Network security protocols
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L51/00—User-to-user messaging in packet-switching networks, transmitted according to store-and-forward or real-time protocols, e.g. e-mail
- H04L51/06—Message adaptation to terminal or network requirements
- H04L51/063—Content adaptation, e.g. replacement of unsuitable content
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Description
Claims (22)
- 第1のコンピュータと第2のコンピュータの間で転送されるメール・メッセージ中のウイルスを検出するためにコンピュータで実施される方法であって、
第1のコンピュータから、宛先アドレスを含むメール・メッセージをゲートウェイ・コンピュータで受信するステップと、
前記メール・メッセージを符号化部分について検査し、前記メール・メッセージが何らかの符号化部分を含むか否かを判定するステップと、
前記メール・メッセージが符号化部分を含む場合、前記メール・メッセージの符号化部分がウイルスを含むか否かを判定するステップと、
前記メール・メッセージの符号化部分がウイルスを含む場合、前記メール・メッセージに対し、所定の動作を実施するステップと、
前記メール・メッセージが何も符号化部分を含まない場合、ウイルス検出プロセスを実施することなく、前記メール・メッセージを前記宛先アドレスへ送信するステップと
からなるコンピュータで実施される方法。 - 第1のコンピュータと第2のコンピュータの間で転送されるメール・メッセージ中のウイルスを検出するためにコンピュータで実施される方法であって、
第1のコンピュータから、宛先アドレスを含むメール・メッセージをゲートウェイ・コンピュータで受信するステップと、
ウイルス検査プロセスを実施するためにSMTPプロキシサーバを実行するステップであって、前記ウイルス検査プロセスが、
前記メール・メッセージを符号化部分について検査し、前記メール・メッセージが符号化部分を含むか否かを判定するステップと、
前記メール・メッセージの符号化部分がウイルスを含むか否かを判定するステップと、
前記メール・メッセージの符号化部分がウイルスを含む場合、前記メール・メッセージに対し、所定の動作を実施するステップと、
前記メール・メッセージが何も符号化部分を含まない場合、ウイルス検出プロセスを実施することなく、前記メール・メッセージを前記宛先アドレスへ送信するステップとを含む、ウイルス検査プロセスを実施するためにSMTPプロキシサーバを実行するステップと
を含み、前記SMTPプロキシサーバは、前記ウイルス検査プロセスをアプリケーション・レベル以下で実施し、ウイルス検査処理が、アプリケーション・レベル層の動作に対して透過的で、かつ見えないものになるようにする、コンピュータで実施される方法。 - 前記メール・メッセージの符号化部分がウイルスを含むか否かを判定するステップは、
前記メール・メッセージの符号化部分を復号し、前記メール・メッセージの復号化部分を生成するステップと、
前記復号化部分のそれぞれについてウイルスを検査するステップと、
前記検査するステップで何らかのウイルスが発見されたか否かを調べるステップと
を含む、請求項1又は請求項2に記載のコンピュータで実施される方法。 - 前記メール・メッセージの符号化部分がウイルスを含むか否かを判定するステップは、前記メール・メッセージの符号化部分をそれぞれ個別の一時ファイルに格納することを含み、
前記符号化部分を復号するステップは、前記個別の一時ファイルに格納された前記符号化部分をそれぞれ個別に復号することを含む、請求項3に記載のコンピュータで実施される方法。 - 前記メール・メッセージが何らかの符号化部分を含むか否かを判定するステップは、uuencodeされた部分を探すことを含む、請求項3に記載のコンピュータで実施される方法。
- 前記検査するステップは、シグネチャ検査プロセスを使用して実施される、請求項3に記載のコンピュータで実施される方法。
- 前記メール・メッセージに対し、所定の動作を実施するステップは、
前記メール・メッセージを変更せずに転送するステップ、
前記メール・メッセージを転送しないステップ、
前記メール・メッセージを新たなファイル名を有するファイルとして格納し、該新たなファイル名のメール・メッセージを受信者に通知するステップ、及び
前記判定するステップの出力を前記メール・メッセージに書き込むことによって、変更されたメール・メッセージを生成し、該変更されたメール・メッセージを前記宛先アドレスへ転送するステップからなる一群の中からいずれか一つのステップを実施することを含む、請求項1又は請求項2に記載のコンピュータで実施される方法。 - 前記メール・メッセージに対し、所定の動作を実施するステップは、
前記メール・メッセージを変更せずに転送するステップ、
ウイルスの除去された前記符号化部分を含むメール・メッセージを転送するステップ、
ウイルスを含む前記メール・メッセージの符号化部分をリネームし、リネームされた部分をファイルとしてゲートウェイ・コンピュータ上の指定されたディレクトリに格納し、該リネームされたファイル、及びディレクトリを受信者に通知するステップ、及び
前記判定するステップの出力を、ウイルスを含む個々の符号化部分の代わりに、前記メール・メッセージに書き込み、変更されたメール・メッセージを生成し、該変更されたメール・メッセージを送信するステップからなる一群の中からいずれか一つのステップを実施することを含む、請求項1又は請求項2に記載のコンピュータで実施される方法。 - 前記ゲートウェイ・コンピュータは、SMTPプロキシサーバ、及びSMTPデーモンを含み、
前記コンピュータで実施される方法は、
前記SMTPプロキシサーバを第1のポートにバインドし、クライアントタスクと前記SMTPプロキシサーバとの間で前記メール・メッセージを伝送するためのチャネルを確立するステップと、
前記SMTPプロキシサーバとの通信のために、共有ライブラリ中のバインド関数を再定義することによって前記SMTPデーモンを第2のポートにバインドするステップと
を更に含む、請求項1に記載のコンピュータで実施される方法。 - 前記SMTPデーモンを第2のポートにバインドするステップは、前記SMTPデーモンが前記第1のポートへのバインドを試みる場合に、前記SMTPデーモンを強制的に前記第2のポートにバインドすることを含む、請求項9に記載のコンピュータで実施される方法。
- 前記メール・メッセージが何も符号化部分を含まない場合、前記メール・メッセージを前記SMTPプロキシサーバから前記SMTPデーモンへ転送するステップと、
サーバ・タスクとの通信のために、前記SMTPデーモンを第3のポートにバインドするステップと
を更に含む、請求項10に記載のコンピュータで実施される方法。 - 第1のコンピュータと第2のコンピュータの間で転送されるメール・メッセージ中のウイルスを検出するためのゲートウェイ・コンピュータ装置であって、
前記第1のコンピュータからメール・メッセージを受信するためのチャネルを確立するための第1のポートと、
前記第1のポートを介して、宛先アドレスを含むメール・メッセージを受信するSMTPプロキシサーバであって、前記メール・メッセージの符号化部分を検査することにより、前記メール・メッセージがウイルスを含むか否かを判定するとともに、前記メール・メッセージが何らかの符号化部分を含むか否かを判定するSMTPプロキシサーバと、
SMTPデーモンと、
前記SMTPプロキシサーバと前記SMTPデーモンとの間で通信を行うための第2のポートと、
前記第2のコンピュータへメール・メッセージを送信するための第3のポートであって、前記メール・メッセージがウイルスを含まない場合に、該第3のポートを介して前記SMTPデーモンが、前記メール・メッセージを前記宛先アドレスへ送信する、第3のポートと
を含み、前記SMTPプロキシサーバは、前記メール・メッセージが符号化部分を含む場合に、ウイルス検出プロセスを実施し、前記メール・メッセージが何も符号化部分を含まない場合に、ウイルス検出プロセスを実施することなく、前記メール・メッセージを前記SMTPデーモンへ送信する、ゲートウェイ・コンピュータ装置。 - 第1のコンピュータと第2のコンピュータの間で転送されるメール・メッセージ中のウイルスを検出するためのゲートウェイ・コンピュータ装置であって、
前記第1のコンピュータからメール・メッセージを受信するためのチャネルを確立するための第1のポートと、
前記第1のポートを介して、宛先アドレスを含むメール・メッセージを受信するSMTPプロキシサーバであって、前記メール・メッセージの符号化部分を検査することにより、前記メール・メッセージがウイルスを含むか否かを判定するとともに、前記メール・メッセージが何らかの符号化部分を含むか否かを判定するSMTPプロキシサーバと、
SMTPデーモンと、
前記SMTPプロキシサーバと前記SMTPデーモンとの間で通信を行うための第2のポートと、
前記第2のコンピュータへメール・メッセージを送信するための第3のポートであって、前記メール・メッセージがウイルスを含まない場合に、該第3のポートを介して前記SMTPデーモンが、前記メール・メッセージを前記宛先アドレスへ送信する、第3のポートと
を含み、前記SMTPプロキシサーバは、前記メール・メッセージの符号化部分の検査、及び前記メール・メッセージがウイルスを含むか否かの判定を、アプリケーション・レベル以下で実施し、ウイルス検査処理が、アプリケーション・レベル層の動作に対して透過的で、かつ見えないものになるようにする、ゲートウェイ・コンピュータ装置。 - 前記SMTPサーバは、前記メール・メッセージの符号化部分を復号し、前記メール・メッセージの復号化部分を生成し、該復号化部分のそれぞれについてウイルスを検査し、前記検査するステップで何らかのウイルスが発見されたか否かを調べ、前記メール・メッセージがウイルスを含む場合、前記メール・メッセージに対し、所定の動作を実施する、請求項12又は請求項13に記載のゲートウェイ・コンピュータ装置。
- 前記メール・メッセージの符号化部分をそれぞれ個別に復号できるように、前記メール・メッセージの符号化部分をそれぞれ格納するための個々のデータベースをさらに含む、請求項14に記載のゲートウェイ・コンピュータ装置。
- 前記SMTPプロキシサーバは、シグネチャ検査プロセスを使用して、前記復号化部分をそれぞれ検査する、請求項14に記載のゲートウェイ・コンピュータ装置。
- 前記SMTPプロキシサーバは、uuencodeされた部分を探すことによって、前記メール・メッセージが何らかの符号化部分を含むか否かを判定する、請求項12又は請求項13に記載のゲートウェイ・コンピュータ装置。
- 前記SMTPデーモンは、前記メール・メッセージが何も符号化部分を含まない場合に、前記メール・メッセージを前記宛先アドレスへ送信する、請求項12に記載のゲートウェイ・コンピュータ装置。
- 前記SMTPプロキシサーバは、共有ライブラリ中のバインド関数を再定義することによって、前記SMTPデーモンを前記第2のポートにバインドする、請求項12又は請求項13に記載のゲートウェイ・コンピュータ装置。
- 前記SMTPプロキシサーバは、前記SMTPデーモンが前記第1のポートへのバインドを試行する場合に、前記SMTPデーモンを強制的に前記第2のポートにバインドすることによって、前記SMTPデーモンを前記第2のポートにバインドする、請求項19に記載のゲートウェイ・コンピュータ装置。
- SMTPプロキシサーバを実行するステップをさらに含み、
前記SMTPプロキシサーバは、前記メール・メッセージを符号化部分について検査するステップ、前記メール・メッセージの符号化部分がウイルスを含むか否かを判定するステップ、及び前記所定の動作を実施するステップを、アプリケーション・レベル以下で実施し、ウイルス検査処理が、アプリケーション・レベル層の動作に対して透過的で、かつ見えないものになるようにする、請求項1に記載のコンピュータで実施される方法。 - 前記SMTPプロキシサーバは、前記ウイルス検査処理をアプリケーション・レベル以下で実施し、ウイルス検査処理が、アプリケーsyン・レベル層の動作に対して透過的で、かつ見えないものになるようにする、請求項12に記載のゲートウェイ・コンピュータ装置。
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US08/533,706 US5623600A (en) | 1995-09-26 | 1995-09-26 | Virus detection and removal apparatus for computer networks |
US08/533,706 | 1995-09-26 |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
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JP2004225912A Division JP2005011369A (ja) | 1995-09-26 | 2004-08-02 | コンピュータ・ネットワーク用のウイルス検出・除去装置 |
Publications (3)
Publication Number | Publication Date |
---|---|
JP2008171415A JP2008171415A (ja) | 2008-07-24 |
JP2008171415A5 JP2008171415A5 (ja) | 2008-09-04 |
JP4778950B2 true JP4778950B2 (ja) | 2011-09-21 |
Family
ID=24127119
Family Applications (3)
Application Number | Title | Priority Date | Filing Date |
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JP9506029A Pending JPH11513153A (ja) | 1995-09-26 | 1996-09-25 | コンピュータ・ネットワークの、ウイルス検出及び除去装置 |
JP2004225912A Pending JP2005011369A (ja) | 1995-09-26 | 2004-08-02 | コンピュータ・ネットワーク用のウイルス検出・除去装置 |
JP2007327067A Expired - Lifetime JP4778950B2 (ja) | 1995-09-26 | 2007-12-19 | コンピュータ・ネットワーク用のウイルス検出・除去装置 |
Family Applications Before (2)
Application Number | Title | Priority Date | Filing Date |
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JP9506029A Pending JPH11513153A (ja) | 1995-09-26 | 1996-09-25 | コンピュータ・ネットワークの、ウイルス検出及び除去装置 |
JP2004225912A Pending JP2005011369A (ja) | 1995-09-26 | 2004-08-02 | コンピュータ・ネットワーク用のウイルス検出・除去装置 |
Country Status (7)
Country | Link |
---|---|
US (1) | US5623600A (ja) |
EP (1) | EP0852762A1 (ja) |
JP (3) | JPH11513153A (ja) |
AU (1) | AU2001997A (ja) |
DE (1) | DE19680539T1 (ja) |
GB (1) | GB2309561A (ja) |
WO (1) | WO1997012321A1 (ja) |
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1995
- 1995-09-26 US US08/533,706 patent/US5623600A/en not_active Expired - Lifetime
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1996
- 1996-09-25 JP JP9506029A patent/JPH11513153A/ja active Pending
- 1996-09-25 GB GB9626395A patent/GB2309561A/en not_active Withdrawn
- 1996-09-25 DE DE19680539T patent/DE19680539T1/de not_active Withdrawn
- 1996-09-25 AU AU20019/97A patent/AU2001997A/en not_active Abandoned
- 1996-09-25 EP EP96933128A patent/EP0852762A1/en not_active Withdrawn
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JPH11513153A (ja) | 1999-11-09 |
JP2005011369A (ja) | 2005-01-13 |
GB2309561A (en) | 1997-07-30 |
GB9626395D0 (en) | 1997-02-05 |
JP2008171415A (ja) | 2008-07-24 |
AU2001997A (en) | 1997-04-17 |
EP0852762A1 (en) | 1998-07-15 |
DE19680539T1 (de) | 1997-12-11 |
US5623600A (en) | 1997-04-22 |
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