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- *********************************************
- *** Reports collected and collated by ***
- *** PC-Virus Index ***
- *** with full acknowledgements ***
- *** to the authors ***
- *********************************************
-
-
- BRAIN and variants including CHAOS.
-
- BRAIN was first reported in 1987 but a copyright notice (sic)
- suggests that it was published in 1986. Despite the copyright
- notice and, consistent with normal software practice, other hands
- have since tinkered with the code and several versions with fairly
- minor modifications, mainly in the embedded text, have been
- reported.
-
- In its original form, it only infected 5.25" - 360 KB diskettes.
- CHAOS is a variant that infects Hard Disks.
-
- DAMAGE is minimal in its original version:
-
- a) it overwrites the original Boot Sector on the diskette (the
- first 512 bytes) and places some of its own code in this
- location from where it can intercept all calls to boot. It
- also leaves room on the diskette for the system files.
-
- b) it creates 3 bad clusters (6 sectors = 3 KB) in the File
- Allocation Table (FAT). It uses the first sector of these Bad
- Clusters to store the code that it has displaced from the Boot
- Sector and the other five sectors to store the remainder of its
- own code. Its total length is around 2.25 KB but it requires
- 0.5 KB of work area. When loaded into memory it occupies 7 KB.
-
- c) With the original version, a Volume Label (c) BRAIN is
- attached to diskettes and any existing label will be
- overwritten. Another version attaches the label (c) Ashar. The
- label only appears when more than two files are placed in the
- directory.
-
- d) Unconfirmed reports advise that there is a version which
- scrambles the FAT.
-
- BRAIN hides from Disk Sector Editors (eg Norton) by redirecting them
- to the original Boot Sector that has been relocated into a Bad
- Cluster.
-
- With the original version a text message is included but not
- displayed:
-
- ' Welcome to the Dungeon '
- ' (c) 1986 Basit & Amjad (pvt) Lt'
- 'd. BRAIN COMPUTER SERVICES..730 NI'
- 'ZAM BLOCK ALLAMA IQBAL TOWN LAHOR'
- 'E-PAKISTAN..PHONE :430791,443248,280530. '
- ' Beware of this VIRUS.....Contact us for vaccin'
- 'ation............... $#@%$@!! '
-
- ---------------------- more -----------------------
-
- Version 2: (aka Ashar)
-
- This virus consists of a boot sector and three clusters (6 sectors)
- marked as bad in the FAT. The first of these sectors contains the
- original boot sector, and the rest contain the rest of the virus.
- It only infects 360K floppies. It creates a label on an infected
- disk of ' (c) ashar '. Unlike the first version, this one does not
- leave room for the system files.
-
- ------------------- more -----------------
-
- === Computer Virus Catalog 1.2: SHOE-B v9.0 (July 10, 1989) ==========
-
- Entry.................. SHOE-B v9.0
- Alias(es).............. ---
- Strain................. Brain/Pakistani
- Detected: when......... November 1988
- where........ Houston University
- Classification......... System (Boot sector) virus
- Length of Virus........ approx. 3k (not all is actually used)
- ---------------------- Preconditions----------------------------------
-
- Operating System(s).... MS-DOS
- Version/Release........ Should work with all versions
- Computer models........ IBM-PC's and compatibles
- ------------------------ Attributes-----------------------------------
-
- Easy identification.... The volume label of the infected disk will
- read: "(c) Brain"
-
- Type of infection...... The virus installs itself in high memory after
- booting with an infected disk. It captures all
- read and write calls to the disk, checks for
- infection and, if not yet present, infects the
- disk. Infection occurs by flagging five blocks
- as bad, copying itself and the original boot
- sector into those five blocks, and replacing
- the boot sector with its own. The virus
- identifies itself by checking the boot sector
- for the word 1234h at position 0004h in the
- boot sector.
-
- Infection trigger...... Counter: will attempt to infect initially
- after 31 read/write calls, subsequently after
- every fourth call.
-
- Media affected......... Only floppy disks; Hard disks not infected.
-
- Interrupts hooked...... Int 13h functions 2,3 (read,write).
-
- Damage................. Destroys five blocks (as well as the boot
- sector) upon infection, otherwise nothing.
-
- Damage trigger......... ---
-
- Particularities........ The virus looks whether attempts are made to
- read the boot sector; in this case, the virus
- transfers the original boot sector. The virus
- can therefore not be identified with utilities
- such as PC-TOOLS or NORTON UTILITIES.
-
- An infected boot sector contains the following
- typical text:
-
- "Welcome to the Dungeon (c) 1986 Basit &
- Amjads (pvt) Ltd VIRUS_SHOE RECORD v9.0
- Dedicated to the dynamic memories of millions
- of virus who are no longer with us today -
- Thanks GOODNESS!! BEWARE OF THE er..VIRUS:
- \this program is catching program follows
- after these messeges..... $#%$!! ";
-
- this text is never displayed.
-
- Similarities........... Similar to all viruses of Pakistani/Brain
- strain.
-
- ----------------------- Agents ------------------------------
-
- Countermeasures........ ----
-
- Countermeasures successful ---
-
- Standard Means......... The DOS command "SYS n:" (where n is the drive
- of the infected disk) will disinfect the disk
- IF AND ONLY IF you have booted from a clean
- disk. You will have to use utilities such as
- PC-TOOLS to recover the "bad" sectors.
-
- --------------------- Acknowledgements--------------------------------
-
- Location............... VTC Hamburg, FRG
- Classification by...... Morton Swimmer
- Documentation by....... Morton Swimmer
- Date................... June 29, 1989
- Information source..... PC VIRUS LISTING (Jim Goodwin)
-
-
- ===================== End of SHOE-B v9.0 Virus ======================
-
-
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