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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.Ī modified version of the virus called CIH.1106 was discovered in December 2002, but it is not considered a serious threat.
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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. Technically, however, it was possible to replace the BIOS chip, and methods for recovering hard disk data emerged later. Both of these payloads served to render the host computer inoperable, and for most ordinary users the virus essentially destroyed the PC. CIH filled the first 1024 KB of the host's boot drive with zeros and then attacked certain types of BIOS. ĬIH's dual payload was delivered for the first time on April 26, 1999, with most of the damage occurring in Asia. In July 1998, a demo version of the first-person shooter game SiN was infected by one of its mirror sites.
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On December 31, 1999, Yamaha shipped a software update to their CD-R400 drives that was infected with the virus. In July 1999, copies of remote administration tool Back Orifice 2000 given out for DEF CON 7 attendees were discovered by the organizers to have been infected with CIH. In March 1999, several thousand IBM Aptivas shipped with the CIH virus, just one month before the virus would trigger. This does not increase the file size and in that way helps the virus avoid detection. In contrast to this, CIH looks for gaps in the existing program code, where it then writes its own code.
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The name "Spacefiller" was introduced because most viruses write their code to the end of the infected file, with infected files being detectable because their file size increases.
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 creation date in 1998, to trigger exactly a year later) and the Chernobyl disaster, which happened in the Soviet Union on April 26, 1986. These events led to new computer crime legislation in Taiwan. Prosecutors in Taiwan could not charge Chen at the time because no victims came forward with a lawsuit.
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Chen stated that after the virus was spread across Tatung University by classmates, he apologized to the school and made an antivirus program available for public download the antivirus program was co-authored with Weng Shi-hao (翁世豪), a student at Tamkang University.
Ĭhen claimed to have written the virus as a challenge against bold claims of antiviral efficiency by antivirus software developers.
Sixty million computers were believed to be infected by the virus internationally, resulting in an estimated US$1 billion in commercial damages. The virus was created by Chen Ing-hau (陳盈豪, pinyin: Chén Yíngháo) who was a student at Tatung University in Taiwan. Its payload is highly destructive to vulnerable systems, overwriting critical information on infected system drives, and in some cases destroying the system BIOS. Antivirus intercept message on a Windows95 systemĬIH, also known as Chernobyl or Spacefiller, is a Microsoft Windows 9x computer virus which first emerged in 1998.
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