Hii,
This is a virus detection. Viruses are programs that self-replicate recursively, meaning that infected systems spread the virus to other systems, which then propagate the virus further.
While many viruses contain a destructive payload, it's quite common for viruses to do nothing more than spread from one system to another.
Aliases
* Happy Birthday Joshi
Characteristics
Char acter istics -
Joshi is a memory resident, Master Boot Record (MBR)/Boot Sector virus. Joshi does not cause any damage to the system.
This virus may be recognized on infected systems by powering off the system and then booting from a known-clean, write-protected DOS diskette. Using a sector editor or viewer to look at the boot sector of suspect diskettes, if the first two bytes of the boot sector are hex EB 1F, then the diskette is infected.
The EB 1F is a jump instruction to the rest of the viral code. The remainder of the virus is stored on track 40, sectors1 through 5 on 360K 5.25 inch diskettes. For 1.2M 5.25 inch diskettes, the viral code is located at track 80, sectors 1 through 5. It will also be located on the last track of 3.5 inch diskettes.
Additional Comments:
The Joshi virus was isolated in India in June 1990. At the time it was isolated, it was reported to be widespread in India as well as portions of the continent of Africa. Joshi is a memory resident boot sector infector of diskettes and the hard disk master boot sector (partition table).
After a system has been booted from a Joshi-infected diskette, the virus will be resident in memory.
Joshi takes up approximately 6K of system memory, and infected systems will show that total system memory is 6K less than is installed if the DOS CHKDSK program is run.
Joshi has some similarities to two other boot sector infectors. Like the Stoned virus, it infects the master boot sector of hard disks.
Similar to the Brain virus's method of redirecting all attempts to read the boot sector to the original boot sector, Joshi does this with the master boot sector. On January 5th of any year, the Joshi virus activates.
At that time, the virus will hang the system while displaying the message: "type Happy Birthday Joshi" If the system user then types "Happy Birthday Joshi", the system will again be usable. This virus may be recognized on infected systems by powering off the system and then booting from a known-clean, write-protected DOS diskette.
Using a sector editor or viewer to look at the boot sector of suspect diskettes, if the first two bytes of the boot sector are hex EB 1F, then the disk is infected. The EB 1F is a jump instruction to the rest of the viral code.
The remainder of the virus is stored on track 40, sectors 1 through 5 on 360K 5.25 inch Diskettes. For 1.2M 5.25 inch diskettes, the viral code is located at track 80, sectors 1 through 5. It will also be located on the last track of 3.5" diskettes.
To determine if a system's hard disk is infected, you must look at the hard disk's master boot sector. If the first two bytes of the master boot sector are EB 1F hex, then the hard disk is infected.
The remainder of the virus can be found at cylinder 0, side 0, sectors 2 through 6. The original master boot sector will be located at cylinder 0, side 0, sector 9.
The Joshi virus can be manually removed from an infected system by first powering off the system, and then booting from a known-clean, write-protected master DOS diskette.
Answered by
Ajay Pal
, an ibibo Master,
at
7:42 AM on June 24, 2008
