computer viruses associated email attachments

... non-virally induced 5.1 RNA tumor viruses Although retroviruses have been associated with many animal tumors, to date, only one human retrovirus, HTLV-1, has been associated with human cancers The ... cellular tumor suppressor genes. Studies on the small DNA tumor viruses, which include the adenoviruses, polyomaviruses, and papillomaviruses, have been instrumental in elucidating the underlying ... roles of viruses in human cancer The search for additional human tumor viruses continued, and, despite several setbacks, the ultimate acknowledgment of the causal relationship between viruses

Ngày tải lên: 15/02/2014, 05:20

... active Macro viruses have not been parasitic, meaning they have not inserted vi-ral code into legitimate code, but have acted more like companion viruses.^^^ (Nothing prevents macro viruses from ... and consequently restoring these files may result in data loss There are also viruses called data diddlers, which are viruses whose payload slowly changes files ^^^ By the time a data diddler has ... Rather than customize disinfection to individual viruses, disinfection can be attempted based on assumptions about viral behavior For prepending viruses, or appenders that gain control by modi-fying

Ngày tải lên: 14/08/2014, 18:20

... described earlier • Phishing attacks send email which tricks recipients into visiting the at-tacker's web site and entering information For example, a phishing email might threaten to close a user's ... parts to a typical hoax email :^-^^ 1 The hook This is something that grabs the hoax recipient's attention 2 The threat Some dire warning about damage to the recipient's computer caused by the ... engineering: • Phony pop-up boxes, asking the user to re-enter their username and pass-word • Fake email about winning contests, directing users to an attacker's web site There, the user must create

Ngày tải lên: 14/08/2014, 18:20

... The computer at the perimeter forming the defense may be a general-purpose computer, or a special-purpose computer like a router In either case, there are several functions the perimeter computer ... network Trang 6computer at the network's perimeter The nature of this perimeter computer has been left deliberately vague; it can be a dedicated network router or a general-purpose computer, which ... computer dedicated to this task, then that computer is also referred to as a firewall.^ Firewall software can be run on a perimeter computer, a host computer, or both Each network packet in the

Ngày tải lên: 14/08/2014, 18:20

... infected computer later, with almost no chance of being caught A zombie network can be leveraged to send more effective spam: infected computers can be viewed as repositories of legitimate email ... saved email to learn a user's typical habits for email capitalization, misspellings, and signatures The malware can then automatically mimic those habits in spam sent to people the user normally emails; ... warfare is the use of computers to supplement or supplant con-ventional warfare Computers can play a variety of roles in this regard, ing acquiring information from an adversary's computers, planting

Ngày tải lên: 14/08/2014, 18:20

... mitigation, April 2004 [74] F Cohen Computer viruses: Theory and experiments Computers & Security, 6(1):22-35, 1987 [75] F B Cohen A Short Course on Computer Viruses Wiley, second edition, 1994 ... violating computer systems SANS Information Security Reading Room, 13 August 2001 [11] J P Anderson Computer security threat monitoring and surveillance, 15 April 1980 Trang 5[12] J P Anderson Computer ... (fooling the debugger), 1999 [58] S Cesare Unix viruses Undated, post-October 1998 [59] D A Chambers Method and apparatus for detection of computer viruses United States Patent #5,398,196, 14 March

Ngày tải lên: 14/08/2014, 18:20

... conundrums just disappear (The fiat creation of computer viruses philoso-6 The Giant Black Book of Computer Viruses 6 Please refer to my other book, Computer Viruses, Artificial Life and Evolution, for ... fascinating variety of live viruses toexperiment with on your own computer or check your antivirus software with? In this book you'lllearn the basics of viruses that reproduce through email, and then go ... information about computer viruses As I see it,there are three reasons for making this kind of information public: Trang 91 It can help people defend against malevolent viruses.2 Viruses are of

Ngày tải lên: 14/08/2014, 18:22

... hostprogram Many viruses are of this type, and it can have advantages in certain situations For example, on computers with slow disks, or when infecting files on floppy disks, viruses which put ... Memory Resident VirusMemory resident viruses differ from the direct-acting viruseswe’ve discussed so far in that when they are executed, they hidethemselves in the computer’s memory They may not infect ... themthen Historically, memory resident viruses have proven to be muchmore mobile than the direct-acting viruses we’ve studied so far All of the most prolific viruses which have escaped and run amok

Ngày tải lên: 14/08/2014, 18:22

... Trang 1An Introduction to Boot Sector VirusesThe boot sector virus can be the simplest or the most cated of all computer viruses On the one hand, the boot sector is always located ... by the computer This ROM code is written in assembly language and stored on chips (EPROMS) inside the computer Typically this code will perform several functions necessary to get the computer ... three chapters we will examine several different boot sector viruses This chapter will take a look at two of the simplest boot sector viruses just to introduce you to the boot sector The following

Ngày tải lên: 14/08/2014, 18:22

... boot sector viruses are not the only ties for DOS executables One could also infect SYS files Although infecting SYS files is perhaps not that important a vector for propagating viruses, simply ... exercise will be helpful in opening your mind up to the possibilities open to viruses And certainly there are more than a few viruses out there that do infect device drivers already. possibili-Let’s ... memory—much faster than opening and reading a file What kind of flag is appropriate though? Some viruses use a very simple flag, like advancing the date in the file’s date/time stamp by 100 years

Ngày tải lên: 14/08/2014, 18:22

... Book of Computer Viruses. .. 1 Ralf Burger, Computer Viruses and Data Protection, (Abacus, Grand Rapids, MI:1991) p 252 292 The Giant Black Book of Computer Viruses kilobytes ... on some Unix software, but he put his C code onto a 294 The Giant Black Book of Computer Viruses DOS disk and... so they can be called easily However, one of the file attributes ... the more modern idea of what a virus is Source Code Viruses 297 Many people credit Fred Cohen with being the inventor of viruses Certainly he was the first to put a coherent discussion

Ngày tải lên: 14/08/2014, 18:22

... experimenting with such techniques in the early 90’s Some of the first viruses which employed such tech- niques were the 1260 or V2P2 series of viruses Before long, a Bulgarian who called himself the Dark ... it is fairly safe to experiment with. Typically, polymorhic viruses have a few more hoops to jump through themselves than do ordinary viruses Firstly, the virus doesn’t have the liberty to perform ... processor is already in V86 mode it will just load as an ordinary DOS virus. Trang 27Polymorphic VirusesNow let’s discuss a completely different tactic for evading anti-virus software This approach

Ngày tải lên: 14/08/2014, 18:22

... justplain dangerous to disinfect an infected computer All of theseconsiderations apply to detecting and getting rid of viruses that arealready in a computer doing their work One subject we haven’t ... wanti-ays As we’ve discussed, scanners detect viruses before they areexecuted, whereas programs like behavior checkers and integritycheckers catch viruses while they are executing or after they ... scheme,which would reveal the original source of the infection.Defense Against Retaliating Viruses In conclusion, viruses which retaliate against anti-viral ware are rather easy to create They have

Ngày tải lên: 14/08/2014, 18:22

... hardware are not subject to such limitations For the most part, logic bombs incorporated into computerviruses use fairly simple trigger routines For example, they acti-vate on a certain date, after ... anything is wrong.Typical of the stealth attack is slow disk corruption, which is used in many computer viruses Typically, a virus that slowly corrupts a disk may sit in memoryand mis-direct a write ... it would be highly unlikely to stop a nuclear attack even if it did find its way into the right computer It might cause somedamage, but probably not the right damage at the right time To write

Ngày tải lên: 14/08/2014, 18:22

... Trang 6Study this search routine carefully It is important to un-derstand if you want to write computer viruses, and more generally, it is useful in a wide variety of programs of all kinds Of course, ... we will use the DOS search functions The people who wrote DOS knew that many programs (not just viruses) require the ability to look for files and operate on them if any of the required type are ... Next, because the Search Next expects the data from the last search call to be there Of course, the computer virus does not need to search through all of the COM files in a directory It must find

Ngày tải lên: 14/08/2014, 18:22

... named INTRUDER, is no toy It is very capable of finding its way into computers all around the world, and deceiving a very capable computer whiz The Structure of an EXE File An EXE file is not as ... giving it a whirl If you do though, be careful! Proceed at your own risk! It’s not like any other computer program you’ve ever run! Trang 6Case Number Two: A Sophisticated Executable Virus The simple

Ngày tải lên: 14/08/2014, 18:22

... advanced anti-detec-tion logic than previous viruses we’ve studied They are aimed not only at avoiding detection by the average user, who doesn’t know computers that well, but also at avoiding detection ... some appropriate action is performed on the floppy diskette by other programs In this way, the computer becomes an engine for producing infected floppy disks So what action on the floppy drive ... user armed with sophisticated software tools, including programs designed specifically to look for viruses The main part of the STEALTH virus is already hidden on disk in areas which the operating

Ngày tải lên: 14/08/2014, 18:22

... It is an extremely contagious virus which will infect your computer, and other computers, if you execute it Only the most sophisticated computer users should even contemplate assembling the following ... :100460008E1E0400FBEA0D000000B05CA2AF00BECF :10047000B00032D2B447CD21803EB00000750532C5 103 The Little Black Book of Computer Viruses Trang 3:1004A0004C803EFD0000743FFE0EFD00BFAF00BE5D :1004B000AA00E8BB004757E8760075235F32C0AA60 ... relocatables in the virus, ;these go in relocatable pointer table 105 The Little Black Book of Computer Viruses Trang 5;Intruder Virus code segment This gains control first, before the host As;this

Ngày tải lên: 14/08/2014, 18:22

... BOOT_ID: DW 0AA55H ;Boot sector ID word MAIN ENDS END START 121 The Little Black Book of Computer Viruses Trang 3Appendix D: The KILROY VirusWARNING: If you attempt to create a disk infected ... to it DOS_LOAD SEGMENT AT 0070H ASSUME CS:DOS_LOAD ORG 0 123 The Little Black Book of Computer Viruses Trang 5DOS_LOAD ENDSMAIN SEGMENT BYTE ASSUME CS:MAIN,DS:MAIN,SS:NOTHING ;This jump ... ;and go write the new sector MOV CX,1 MOV AX,301H INT 13H 125 The Little Black Book of Computer Viruses Trang 7 JMP SHORT LOOK_SYS ;ok, go look for system files SPREAD2: MOV AL,BYTE

Ngày tải lên: 14/08/2014, 18:22

... 80386 Trang 12Viruses, etc.Philip Fites, Peter Johnston, Martin Kratz, The Computer Virus Crisis 1989 (Van Nostrand Reinhold, New York) 1989, ISBN 0-442-28532-9 Colin Haynes, The Computer Virus ... ISBN 0-89588-696-0 Richard B Levin, The Computer Virus Handbook (Osborne/McGraw Hill, New York) 1990, ISBN 0-07-881647-5 John McAfee, Colin Haynes, Computer Viruses, Worms, Data Diddlers, Killer ... 0-312-03064-9 Steven Levey, Hackers, Heros of teh Computer Revolution (Bantam Doubleday, New York, New York) 1984, ISBN 0-440-13405-6 Ralf Burger, Computer Viruses and Data Protection (Abacus, Grand

Ngày tải lên: 14/08/2014, 18:22