WO1995033237A1 - Computer virus trap - Google Patents
Computer virus trap Download PDFInfo
- Publication number
- WO1995033237A1 WO1995033237A1 PCT/US1995/006659 US9506659W WO9533237A1 WO 1995033237 A1 WO1995033237 A1 WO 1995033237A1 US 9506659 W US9506659 W US 9506659W WO 9533237 A1 WO9533237 A1 WO 9533237A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- virus
- emulation
- computer system
- computer
- computer virus
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F9/00—Arrangements for program control, e.g. control units
- G06F9/06—Arrangements for program control, e.g. control units using stored programs, i.e. using an internal store of processing equipment to receive or retain programs
- G06F9/44—Arrangements for executing specific programs
- G06F9/455—Emulation; Interpretation; Software simulation, e.g. virtualisation or emulation of application or operating system execution engines
- G06F9/45533—Hypervisors; Virtual machine monitors
- G06F9/45558—Hypervisor-specific management and integration aspects
-
- 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
- G06F21/566—Dynamic detection, i.e. detection performed at run-time, e.g. emulation, suspicious activities
-
- 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
- G06F21/567—Computer malware detection or handling, e.g. anti-virus arrangements using dedicated hardware
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F9/00—Arrangements for program control, e.g. control units
- G06F9/06—Arrangements for program control, e.g. control units using stored programs, i.e. using an internal store of processing equipment to receive or retain programs
- G06F9/44—Arrangements for executing specific programs
- G06F9/455—Emulation; Interpretation; Software simulation, e.g. virtualisation or emulation of application or operating system execution engines
- G06F9/45533—Hypervisors; Virtual machine monitors
- G06F9/45558—Hypervisor-specific management and integration aspects
- G06F2009/45587—Isolation or security of virtual machine instances
Definitions
- the term computer virus is applied in common and legal usage to software, code, code blocks, code elements and code segments which perform certain functions in the digital computer environment. Code is intended to mean the digital instructions which the computer responds to. Non damaging or legitimate software, code, code blocks, code segments and code elements that serve a useful purpose would not be considered a virus.
- a virus can only cause trouble when it enters a system and finds a location on which to act. In a general sense, the virus must perform an intended function or a function the user or operator did not intend, expect, compensate for or otherwise protect against.
- Some examples of malicious virus activity are: changing names of files making it difficult for the user to access the files, moving a file to a new location, deleting files, interfering with working programs (i.e. causing all the words on a screen to fall to the bottom of the screen in a heap), replicating themselves and clogging up the system making it nonfunctional or waiting for a predetermined time period or after a certain number of toggle operations such as boot, access, cursor movements, mouse clicks, etc. before acting.
- More felonious type viruses are those that have been released to cause ruin or impairment of a system for the purposes of sabotage, espionage, financial gain or to impair a competing business.
- Some examples include: creating a trap door which allows access to an unauthorized user for any purpose such as espionage, dumping files or erasure, navigation programs which find routes into systems, password cracking programs, modifying the executable segment of legitimate programs and attaching themselves to a code block and travel to another site.
- BIOS Basic Input Output System
- OS Operating System
- a virus to act on a computer system. All computers go through a boot procedure in which the Basic Input Output System (BIOS) and/or other resident system tools perform a variety of startup tasks such as, finding drives, testing memory and the system, initiating system files, loading DOS or other Operating System (OS) and bringing up an initial startup program.
- the system performs certain housekeeping tasks such as establishing various links among other functions.
- a computer system of any utility is complex enough that someone writing a virus has a myriad of opportunities and possibilities in which to cause trouble and interfere with the proper operation of the system.
- the most common solution to the virus problem is to employ anti-virus software that scans, detects and eliminates viruses from computer systems. These programs work by searching a storage medium such as a hard disk drive or floppy diskette for known patterns of various viruses.
- the software can only scan for known viruses which have an identifiable pattern that can be detected using repetitive string searches. To protect against new viruses frequent upgrades must be distributed.
- the program for the program to detect a virus it must already have infected that computer. The virus might have done some damage or even replicated itself and spread before it is detected. Also, the program must be run often to provide effective protection against viruses especially on systems where programs and data are transferred frequently between computers via diskettes.
- CRC programs suffer from the fact that they are easy to identify and thus easily tricked into recreating a "signature" for an infected file. Further, Scanners & Monitors & CRC programs must be run on the PC in question. Often this is a time consuming chore. These programs usually must have full control of the PC to operate further inconveniencing the user because he must wait for the scanner to finish before he can begin his normal work. The other critical concept is that the anti-virus software is run on the PC in question. It is subject to the limitations and liabilities of the operating system and may already be rarining on .an infected PC without knowing it. The invention takes a unique approach by performing its logic outside of the PC, not inconveniencing the user and is more effective because the invention's hardware guarantees a clean uninfected start.
- the present invention utilizes this characteristic of viruses to create an impenetrable barrier through which a virus cannot escape.
- the use of a foreign operating system guarantees the invention a high degree of safety and impenetrability. While the inventors recognize that such invention can be built without the use of a foreign operating system, such a version of the invention would lack any creditable degree of security. In addition, without the use of a foreign operating system the invention itself risks contamination.
- a foreign operating system different from the one being protected is introduced into the data stream before the data arrives at the computer system to be protected. To illustrate: if a program written for DOS will not run as intended on a Macintosh neither will a virus.
- a foreign operating system in order to complete its operation must provide an emulation of the target computer operating system (disk drives, memory configuration, ports, etc.).
- the virus is therefor fooled into thinking it is resident on the target computer system it was intending to infect. It is here, while the virus is resident within the emulated target operating system, that the virus is encouraged to infect files, destroy data and wreak havoc. It is here that the invention diverges from all other strategies in virus- detection and prevention. All other strategies are defensive in nature: they mark files to detect unwarranted changes, they scan for unintended behavior in an attempt to prevent the virus from performing its damage. The present invention takes an offensive strategy by encouraging the virus to infect and destroy files.
- the most critical behavior of a virus that computer users to prevent is the virus ability to replicate. Once a virus has erased a file, made a hard drive inoperable, it is detected. Once the virus has done anything considered malicious, it usually is detected. At this point anti-virus software and hardware must be brought in and run to detect and clean files. Prior to its performing this malicious act, a virus must replicate. If it does not replicate, it cannot grow and stay alive. If it has the ability to replicate, it can travel from PC to floppy to PC to network, etc. It is this behavior of viruses to replicate that the present invention preys on. The virus is encouraged to act within this cross platform generated emulation so that it can be detected.
- a foreign operating system is chosen based on its ability to monitor and watch any emulations, and for being able to manipulate elements within the emulation (files, falsifying BIOS information, creating sham peripherals), and for the sheer speed and computational horsepower.
- the use of a foreign operating system can be likened to the use of lead walls and glass walls and mechamcal arms used by people manipulating radioactive materials in labs. While it is certainly possible to pick up radioactivity with one's bare hands, it is not highly recommended or is it safe. While the invention can be had without the use of a foreign operating system, it is not highly recommended nor is it safe.
- a primary object of the present invention is to provide a virus detection system to detect and eliminate viruses at their most basic level by simulating the host's environment by creating a virtual world to fool the virus into thinking it is resident on the host so as to allow disruptive behavior to be detected and the virus destroyed without harm to the host.
- Another object of the present invention is to provide a virus detection system able to detect and trap viruses at any level using in a way other than performing string searches through memory or files to detect viruses.
- Yet another object of the present invention is to provide a virus detection system able to detect as of yet unknown viruses thereby obviating the need for software updates to keep the detection device current.
- Still another object of the present invention is to niinimize the down time of the host computer system in the event a virus is detected.
- Still another object of the invention is to record at the user's discretion- the virus to another media for transferal to virus analysis groups.
- the object is to feed the virus to an internal analysis to compare against a know, previously acquired attempt, such as a trapdoor or file change, or industrial espionage or sabotage code, etc.
- Still another object is to record from which incoming source the virus came, i.e., modem, which digiboard channel, internet, CompuServe, LAN station/Userid, WAN line, etc.
- modem which digiboard channel, internet, CompuServe, LAN station/Userid, WAN line, etc.
- Another object is to alert system administration of the attack.
- Fig 1 is a high level functional block diagram of the preferred embodiment of the present invention.
- Fig. 2 is a functional block diagram of the preferred embodiment of the present invention.
- Fig. 3 is a functional block diagram showing the application of the present invention in a local area networking environment
- Fig. 4 is a functional block diagram showing the application of the present invention in a telecommunications networking environment
- Fig. 5 is a high level software logic diagram showing the operating steps of the present invention.
- Figs. 6A to 6C together comprise a high level flow chart of the operating steps of the present invention.
- the present invention creates a virtual world for a potential virus.
- An OS that emulates the system to be protected provides a friendly familiar environment for the virus.
- the virus is encouraged to act in this virtual world created for it.
- the results of the virus' disruptive behavior can be detected and consequently the virus can be flagged and eliminated or stored and further analyzed.
- This scheme is based on the assumptions that almost all viruses are executable in nature, no user would try to purposely communicate a destructive virus to another and that it is possible to identify executable instructions in an environment where the instruction cannot possibly operate.
- FIGS 1 and 2 Shown in Figures 1 and 2 are functional block diagrams of the virus trapping device 10.
- the Central Processing Unit (CPU) 12 can be any computing device (i.e. Intel, Motorola, Paramid, National Semincondutor or Texas Instruments microprocessor, multiple chip set CPUs, board level CPUs, etc.).
- the Transputer is particularly well suited because almost all PCs in use today employ CPUs other than the Transputer. A guide to the application and programming of the Transputer can be found in The Transputer Handbook, by Mark Hopkins, copyright 1989 INMOS Ltd. and The Transputer Databook, by Mark Hopkins, 3rd Edition copyright 1992 INMOS Ltd. Italy.
- EPROM 14 holds the operating software for the CPU 12.
- RAM 16 provides a temporary storage facility for the CPU 12 to execute the virus detection software.
- Link adapters 20 provide physical connections to interface the virus trapping device 10 to the outside world.
- the trap device 10 is not limited to two link adapters, any number could be implemented to handle a multitude of input data streams.
- the device 10 reads an mcoming data stream from one or more outside sources.
- An example of a communication link 24 are a Local Area Network (LAN) (i.e. Novell), Wide Area Network (WAN) (i.e. networked LANs), the telephone network (i.e. Modems), radio frequency (RF) type cellular network or some type of data storage device (i.e. floppy diskette, hard disk, tape, CD-ROM, magneto-optical, etc.).
- LAN Local Area Network
- WAN Wide Area Network
- RF radio frequency
- the communication link 24 provides an incoming data stream for the device 10 to operate on. Diskettes are commonly used to transfer data and programs from one computer to another, thus making it a common entry point into the system for viruses.
- An input/output (I/O) interface 18 provides a means for the virus trapping device 10 to communicate with the computer system being protected 28.
- the application of the virus trapping device 10 in a typical operating environment is shown in Figure 3.
- the file server 42 is the computer system to be protected.
- the virus trapping device 10 is placed in the data stream that connects the filer server 42 to other workstations 38.
- the hubs 40 serve to connect the workstations 38 into a LAN and the modems 36 serve to connect remote workstations 38 to the file server 42.
- all traffic to and from the file server 42 is monitored for viruses by the trap 10.
- Another application of the trapping device 10 is shown in Figure 4.
- data traffic passing through the telecommunications network 34 is protected from viruses.
- a user might have a mainframe file server 30 at a remote site connected to the telephone network 34.
- Nodes 32 located in the telephone company's central offices perform access and cross connect functions for customers' data traffic. To prevent the spread of a virus through the network, the trapping device 10 is placed in front of each node 32. Data traffic between workstations 38 connected to the telephone network 34 via modems 36 and the mainframe file server 30 is constantly checked for viruses because the traffic must pass through the virus trapping device 10.
- the trapping device 10 monitors the data stream that enters from the outside world, such as from the communications link 24. All data is treated as data whether it is actually data (i.e. data files) or instructions (i.e. executables) as it passes over the link 24. At this point the actual instructions have not been executed but rather they are in the process of being transmitted for execution. While in this state of transmission, emulation means 48, controlled by the CPU 12, provide a friendly environment for a potential virus. The data is put into the emulation chamber 48 where the virus is fooled into acting as if it were really present on the host system.
- any disruptive behavior the virus is capable of displaying take place in emulation chamber 48 such as replicating, attacking another program or destroying data.
- the virus has complete access to its environment.
- analysis and detection means 50 controlled by the CPU 12 catches the virus in the act of self replication and prevents it from infecting the host system.
- the virus cannot escape the emulation box 48 because the box exists in a foreign operating environment with no access to critical files, keyboard, screen, etc. Access to the real world is completely blocked.
- the emulation software is read from EPROM 14 and executed.
- a connection is established between the workstation 38 and the file server 30 (or 42).
- a connection session is created in the RAM 16 of the CPU 12. In like fashion, a session is created for each user.
- the trapping device 10 splits the data into two paths. One path connects directly to the protected computer system 28 without modification. Data over the other path is written into the emulation box or virtual world created for each user. The write is performed in this box just as it would have been performed on the file server 30, protected computer 28 or workstation 38. Changes in data and time are simulated to trigger time sensitive viruses, fooling then as to the actual data and time. If the environment changes, it is checked to determine whether simply data was written or whether executable code was written.
- CRC Cyclic Redundancy Check
- IRQ Interrupt Request table
- the first step is to determine whether the IRQ table was modified.
- the second step is to determine if another program was written to.
- Many programs attach themselves to IRQs (i.e. network shell programs, mouse drivers, some print drivers, communication and fax drivers). However, none of these programs will try to write code to other executables. No legitimate program will attempt direct changes to the File Allocation Table (FAT) or other internal OS disk area. They typically pass their changes (or writes) through standard well behaved DOS interrupts (INTs) (i.e. INT 21). Or, for example, in the case of file repair programs (i.e. Norton Utilities) which do at times write directly to the FAT, they will also not grab IRQs. It is the combination of grabbing one or more IRQs and attempting changes to either the FAT or executables that allows virus activity to be detected.
- INTs DOS interrupts
- IRQs are prioritized and have different dedicated purposes.
- IRQ 0 is the system clock
- IRQ 1 is the keyboard, etc.
- a virus must grab the highest priority IRQ because if it had a lower IRQ, then a conventional anti-virus program can get in at a higher priority and make the virus more vulnerable to detection.
- Many viruses grab several IRQs, allowing a virus to be detected by its 'signature'.
- most programs except viruses return to DOS about 95% or more of the memory they used for execution upon exiting or receiving an unload instruction.
- the following activities monitored in the virtual environment created in the emulation box, can be used to detect viruses: attachment to IRQs, which IRQs have been attached, whether multiple IRQs have been attached, changes to the FAT, changes to executables, changes to the environment, changes to memory and any Terminate and Stay Resident (TSR) activity after the unload command has been issued and the program should have terminated.
- TSR Terminate and Stay Resident
- response/alarm means 52 can execute any number of user definable optional commands such as messaging or beeping a system admimstrat ' or, notifying the sender and receiver of the file or program, deleting the file, writing to a specially prepared floppy drive, calling a pager with a virus message or shutting down a network segment.
- a logic flow diagram showing the operating steps the trap device 10 performs is shown in Figures 6 A to 6C.
- FIG. 5 A high level logic diagram of the software is shown in Figure 5.
- the input data stream is generated by commumcation links 24.
- Link adapters 20 convert the data input stream from a hardware and software protocol specific to the particular communication link (i.e. X.25, Novell IPX/SPX, Microsoft NetBEUI, etc.) to a common protocol understandable by the CPU 12.
- the data packets are disassembled into a data stream having a common data format the CPU 12 is able to understand.
- the data is then processed and analyzed for the presence of virus activity. Following processing, data packets are re-assembled and converted to its original hardware and software protocol by the I/O Interface 18 before being output to the protected computer system 28.
- the trap device 10 passes data directly through to the host system in addition to simultaneously processing it. This is to reduce the processing delays associated with sending large data files to the host system and having the trap device 10 process this data before the host receives it.
- the entire contents of a large file except for the final write command or the file close command is transmitted to the host. If no virus is detected, the write or close command is issued. If a virus is detected, the write or close is never issued and the response/alarm means 52 takes appropriate action.
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE69511556T DE69511556D1 (en) | 1994-06-01 | 1995-05-30 | COMPUTER VIRUS TRAP |
JP8501048A JPH10501354A (en) | 1994-06-01 | 1995-05-30 | Computer virus trap device |
EP95922114A EP0769170B1 (en) | 1994-06-01 | 1995-05-30 | Computer virus trap |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US25262294A | 1994-06-01 | 1994-06-01 | |
US08/252,622 | 1994-06-01 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1995033237A1 true WO1995033237A1 (en) | 1995-12-07 |
Family
ID=22956818
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US1995/006659 WO1995033237A1 (en) | 1994-06-01 | 1995-05-30 | Computer virus trap |
Country Status (7)
Country | Link |
---|---|
US (1) | US5842002A (en) |
EP (1) | EP0769170B1 (en) |
JP (1) | JPH10501354A (en) |
AT (1) | ATE183592T1 (en) |
CA (1) | CA2191205A1 (en) |
DE (1) | DE69511556D1 (en) |
WO (1) | WO1995033237A1 (en) |
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US8316439B2 (en) | 2006-05-19 | 2012-11-20 | Iyuko Services L.L.C. | Anti-virus and firewall system |
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Also Published As
Publication number | Publication date |
---|---|
JPH10501354A (en) | 1998-02-03 |
EP0769170B1 (en) | 1999-08-18 |
DE69511556D1 (en) | 1999-09-23 |
EP0769170A4 (en) | 1997-07-30 |
US5842002A (en) | 1998-11-24 |
ATE183592T1 (en) | 1999-09-15 |
CA2191205A1 (en) | 1995-12-07 |
EP0769170A1 (en) | 1997-04-23 |
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