Bio Sponge

CIH (computer virus)

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(Redirected from CIH virus)
CIH, also known as Chernobyl or Spacefiller, is a computer virus written by Chen Ing Hau (??? / Chan YingHao) of Taiwan. It is considered to be one of the most harmful widely circulated viruses, overwriting critical information on infected system drives, and more importantly, in some cases corrupting the system BIOS.
The name “Chernobyl Virus” was coined some time after the virus was already well-known as CIH, and refers to the complete coincidence of the payload trigger date in some variants of the virus (actually the virus writer’s birthday) and the Chernobyl accident, which happened in the Ukrainian SSR on April 26, 1986.
History
In September 1998, Yamaha shipped a firmware update to their CD-R400 Drives that were infected with the virus. In October 1998, a demo version of the Activision game SiN was infected by one of its mirror sites. In March 1999, several thousand IBM Aptivas shipped with the CIH virus, just one month before the virus would trigger.
CIH’s dual payload was delivered for the first time on April 26, 1999, with most of the damage occurring in Asia. CIH filled the first 1024 KB of the host’s boot drive with zeros and then attacked certain types of BIOS. Both of these payloads served to render the host computer inoperable, and for laymen the virus essentially destroyed the PC. Technically, however, it was possible to replace the BIOS chip, and methods for recovering hard disk data emerged later.
Today, CIH is not as widespread as it once was, due to awareness of the threat and the fact it only affects older Windows 9x (95, 98, Me) operating systems.
The virus made another comeback in 2001 when a variant of the LoveLetter Worm in a VBS file that contained a dropper routine for the CIH virus was circulated around the internet, under the guise of a nude picture of Jennifer Lopez.
A modified version of the virus called CIH.1106 was discovered in December 2002, but it is not considered a serious threat.
CIH is considered a threat only if it infects programs used by mass-mailing computer worms, such as Klez, or if the Anjulie Worm comes into play.[clarification needed]
Virus specifics
CIH spreads under the Portable Executable file format under Windows 95, Windows 98, and Windows ME. CIH does not spread under Windows NT, Windows 2000, Windows XP or Windows Vista. Non Microsoft operating systems are not affected. CIH infects Portable Executable files by splitting the bulk of its code into small slivers inserted into the inter-section gaps commonly seen in PE files, and writing a small re-assembly routine and table of its own code segments’ locations into unused space in the tail of the PE header. This earned CIH another name, “Spacefiller”. The size of the virus is around 1 kilobyte, but due to its novel multiple-cavity infection method, infected files do not grow at all. It uses methods of jumping from processor ring 3 to 0 to hook system calls.
The payload, which is considered extremely dangerous, first involves the virus overwriting the first megabyte (1024KB) of the hard drive with zeroes, beginning at sector 0. This deletes the contents of the partition table, and may cause the machine to hang.
The second payload tries to write to the Flash BIOS. Due to what may be an unintended feature of this code, BIOSes that can be successfully written to by the virus have critical boot-time code replaced with junk. This routine only works on some machines. Much emphasis has been put on machines with motherboards based on the Intel 430TX chipset, but by far the most important variable in CIH’s success in writing to a machine’s BIOS is the type of Flash ROM chip in the machine. Different Flash ROM chips (or chip families) have different write-enable routines specific to those chips. CIH makes no attempt to test for the Flash ROM type in its victim machines, and has only one write-enable sequence.
For the first payload, any information that the virus has overwritten with zeros is lost. If the first partition is FAT32, and over about one gigabyte, all that will get overwritten is the MBR, the partition table, the boot sector of the first partition and the first copy of the FAT of the first partition. The MBR and boot sector can simply be replaced with copies of the standard versions, the partition table can be rebuilt by scanning over the entire drive and the first copy of the FAT can be restored from the second copy. This means a complete recovery with no loss of user data can be performed automatically by a tool like Fix CIH.
If the first partition is not FAT32 or is…(and so on) To get More information , you can visit some products about patio teak furniture, rattan arm chair, . The T611 fabric sofa products should be show more here!

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