Malicious Mobile Code: Virus Protection for Windows by Roger A. Grimes

By Roger A. Grimes

Malicious cellular code is a brand new time period to explain every kind of undesirable courses: viruses, worms, Trojans, and rogue net content material. until eventually really lately, specialists nervous as a rule approximately desktop viruses that unfold basically via executable documents, no longer info documents, and positively no longer via electronic mail trade. The Melissa virus and the affection computer virus have proved the specialists improper, attacking home windows desktops whilst recipients do not anything greater than open an electronic mail. this day, writing courses is simpler than ever, and so is writing malicious code that may do damaging issues. the concept that an individual may well write malicious code and unfold it to 60 million pcs in a question of hours is not any longer a fantasy.The excellent news is that there are potent how you can thwart home windows malicious code assaults, and writer Roger Grimes maps them out in Malicious cellular Code: Virus safety for home windows. His establishing bankruptcy at the historical past of malicious code and the multi-million greenback anti-virus units the level for a entire rundown on cutting-edge viruses and the nuts and bolts of defending a procedure from them. He levels throughout the top how you can configure home windows for optimum security, what a DOS virus can and cannot do, what modern-day largest threats are, and different very important and often amazing details. for instance, what number of people comprehend that becoming a member of a talk dialogue can flip one's complete laptop procedure into an open book?Malicious cellular Code offers the techniques, suggestions, and tips to safe a approach opposed to assault. It covers:* present kingdom of the malicious code writing and cracker neighborhood * How malicious code works, what kinds there are, and what it will probably and can't do * universal anti-virus defenses, together with anti-virus software program * How malicious code impacts a few of the home windows working structures, and the way to acknowledge, get rid of, and stop them * Macro viruses affecting MS observe, MS Excel, and VBScript * Java applets and ActiveX controls * Enterprise-wide malicious code defense Hoaxes * the way forward for machine malicious cellular code and the way to wrestle itThese days, by way of holding either domestic desktops and corporate networks opposed to malicious code, the stakes are greater than ever. Malicious cellular Code is the basic consultant for securing a approach from catastrophic loss.

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Viruses often hide increases in infected file size by modifying what DOS returns to the user. It does this by monitoring the DOS interrupts that return memory and file information. For example, if a user types in the DIR command while the virus is in memory, the virus code will pass along the request to DOS. DOS collects the requested information and tries to return it to the user. The virus steps in and does the necessary calculations so that the telltale signs of its infection are hidden. 6 Armor An armored virus contains special programming routines meant to discourage antivirus researchers from tracing, disassembling, and analyzing them.

Contains interrupt code subroutines that allow the operating system or software to access hardware devices. For example, software can initiate an interrupt 13h (h indicates hexidecimal notation) to access the hard drive. 3. Lastly, contains the instructions to find and start the operating system boot process. The CPU always executes the first instruction located at the ROM address FFFF0. ROM chip manufacturers and CPU makers have agreed that the first instruction will always be located in the same memory address location.

Table 2-1 shows a small list of various DOS interrupts that are of special interest to the virus writer. Table 2-1. Common DOS interrupts used by viruses. Interrupt number Function Terminate Int 21h,31h and stay resident Create a Int 21h,3Ch file Open a Int 21h,3Dh file Close a Int 21h,3Eh file Write a Int 21h,40h file Delete a Int 21h,41h file Int 21h,4Eh Find a file Get/set Int 21h,43h file attributes Get/set Int 21h,57h file date In order to write a DOS virus, a programmer must understand the relationships between the ROM BIOS, DOS, and the other interrupts to call the appropriate mechanisms in his coding.

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