Name :	Virus:W32/IndoVirus.A
Category:	Malware
Type:	Trojan
Platform:	W32

IndoVirus.A creates multiple copies of itself on all available drives.

IndoVirus.A attempts to disguise its executable file(s) as Windows folders. It changes the attributes of the original root folders to "hidden" and makes copies of its file using those folder names. It displays a folder-like icon and adjusts the Folder Options/View to "Do not show hidden files and folders" and sets "Hide extensions for known file types".

The result of this disguise are multiple files using folder-like icons lying in wait for the computer user to click on them.

Automatic Disinfection

Usually standalone malware (backdoors, worms, trojans, etc.) is automatically removed by F-Secure Anti-Virus (FSAV) starting from version 5.40. Malware files get automatically renamed by FSAV, so they can not be started any more. In some rare cases, when automatic disinfection is not possible, a user can select disinfection action by him/herself to make FSAV rename or delete an infected file. In some special cases it is recommended to use specific disinfection tools provided by F-Secure. They can be downloaded from our ftp site:

ftp://ftp.f-secure.com/anti-virus/tools/

F-Secure Anti-Virus can be purchased from our web shop or from our authorized distributors. A trial version F-Secure Anti-Virus, limited to 30 days, can be downloaded from our website:

http://www.f-secure.com/download-purchase/

All the latest versions of FSAV can download anti-virus database updates automatically. However, these updates can be also downloaded and installed manually from our web or ftp sites:

http://www.f-secure.com/download-purchase/updates.shtml


Manual Disinfection

To manually disinfect standalone malware (backdoors, worms, trojans, etc.) it is usually enough to delete all infected files from a computer and to restart it. Active malware files are usually locked by operating system so different disinfection approaches are required for different operating systems.
Please note that manual disinfection is a risky process, so it is recommended only for advanced users.

If Windows 95, 98 and ME operating system is used, it is recommended to restart a computer from a bootable system diskette and to delete an infected file from the command prompt. For example, if a malicious file named ABC.EXE is located in Windows folder, it is usually enough to type the following command at the command prompt:

DEL C:\WINDOWS\ABC.EXE

and press Enter. After that an infected file will be gone. If Windows NT, 2000 or XP is used, a malicious file has to be renamed with a different extension (for example .VIR) and then a system has to be restarted. After restart a renamed malicious file will no longer be active and it can be easily deleted manually.


Malware Disinfection Tools

F-Secure provides disinfection tools for certain malware. These tools can be downloaded from this webpage:

http://www.f-secure.com/download-purchase/tools.shtml

ftp://ftp.f-secure.com/anti-virus/tools/


Windows System Restore Issues

If Windows ME or XP is used, it is recommended to disable System Restore features of these operating systems to prevent a computer from re-infection by an already removed malware. The fact is that System Restore feature of these operating systems might save an infected file into the special folder and copy it back to a hard drive it every time it has been renamed or deleted by F-Secure Anti-Virus or by a user. Instructions on how to disable System Restore features are here:

Windows ME:
http://www.f-secure.com/v-descs/sfc_dis.shtml

Windows XP:
http://www.f-secure.com/v-descs/sfc_dis1.shtml

It is recommended to re-enable System Restore after disinfection in order to restore stable system configuration, if any crash or incompatibility issue occurs in the future.


Failed Disinfection

In some cases F-Secure Anti-Virus might not disinfect a system automatically. In this case, please visit our Support pages:

http://support.f-secure.com/enu/home/virusproblem/howtoclean/

Installation to the System

Upon execution, the virus drops a copy of itself with a random name to the Windows and Windows System directories:


It also drops the following files, which are copies of the virus:


The malware uses a folder icon for its executable file, it drops a copy of itself using the name of all existing folders into the root directory of all drives in an infected machine and then it hides the original folders by adjusting their attributes. So, this malware pretends to be a valid folder on a hard drive.

The virus modifies the Registry so that a user can not change Windows Explorer's option to "Show all hidden files or folders". To check for this modification, it is enough to open Windows Explorer, click on Tools menu, and choose Folder Options. Then click on View tab. The "Show all hidden files or folders" option is not available after the infection. The following Registry entries are modified:


Autostart

The virus creates the following startup Registry entries for its files:


Payload

The virus disables the Windows Task Manager and modifies the following Registry entries: