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Overview

This is a trojan detection. Unlike viruses, trojans do not self-replicate. They are spread manually, often under the premise that they are beneficial or wanted. The most common installation methods involve system or security exploitation, and unsuspecting users manually executing unknown programs. Distribution channels include email, malicious or hacked web pages, Internet Relay Chat (IRC), peer-to-peer networks, etc.

Characteristics

This detection is for a trojan that renames several systemfiles, so that the system won't be able to boot the next time. The trojan does not change, add or delete any Registry keys.

Symptoms

After execution, the trojan renames the following files and terminates.

Files in systemroot:

Original filename	Modified filename
AUTOEXEC.BAT	AUTOEXEC.OLD
BOOT.INI	BOOT.OLD
CONFIG.SYS	CONFIG.OLD
IO.SYS	IO.OLD
MSDOS.SYS	MSDOS.OLD
NTDETECT.COM	NTDETECT.OLD
NTLDR	XPLDR

Files in %windir%

Original filename	Modified filename
SYSTEM.INI	ETHERNET.INI
WIN.INI	TCPIP.INI

The mentioned files above need to be renamed manually, if the trojan has been executed.

Method of Infection

Trojans do not self-replicate. They are spread manually, often under the premise that the executable is something beneficial. Distribution channels include IRC, peer-to-peer networks, newsgroup postings, email, etc.

Removal

All Users :
Script,Batch,Macro and non memory-resident:
Use current engine and DAT files for detection and removal.

PE,Trojan,Internet Worm and memory resident :
Use specified engine and DAT files for detection. To remove, boot to MS-DOS mode or use a boot diskette and use the command line scanner:

SCANPM /ADL /CLEAN /ALL

Additional Windows ME/XP removal considerations

Users should not trust file icons, particularly when receiving files from others via P2P clients, IRC, email or other mediums where users can share files.

AVERT Recommended Updates :

* Office2000 Updates

* Malformed Word Document Could Enable Macro to Run Automatically (Information/Patch )

* scriptlet.typelib/Eyedog vulnerability patch

* Outlook as an email attachment security update

* Exchange 5.5 post SP3 Information Store Patch 5.5.2652.42 - this patch corrects detection issues with GroupShield

For a list of attachments blocked by the Outlook patch and a general FAQ, visit this link .
Additionally, Network Administrators can configure this update using an available tool - visit this link for more information .

It is very common for macro viruses to disable options within Office applications for example in Word, the macro protection warning commonly is disabled. After cleaning macro viruses, ensure that your previously set options are again enabled.

Variants

Variants

N/A

All Information

Overview -

This is a trojan detection. Unlike viruses, trojans do not self-replicate. They are spread manually, often under the premise that they are beneficial or wanted. The most common installation methods involve system or security exploitation, and unsuspecting users manually executing unknown programs. Distribution channels include email, malicious or hacked web pages, Internet Relay Chat (IRC), peer-to-peer networks, etc.

Characteristics

Characteristics -

This detection is for a trojan that renames several systemfiles, so that the system won't be able to boot the next time. The trojan does not change, add or delete any Registry keys.

Symptoms

Symptoms -

After execution, the trojan renames the following files and terminates.

Files in systemroot:

Original filename	Modified filename
AUTOEXEC.BAT	AUTOEXEC.OLD
BOOT.INI	BOOT.OLD
CONFIG.SYS	CONFIG.OLD
IO.SYS	IO.OLD
MSDOS.SYS	MSDOS.OLD
NTDETECT.COM	NTDETECT.OLD
NTLDR	XPLDR

Files in %windir%

Original filename	Modified filename
SYSTEM.INI	ETHERNET.INI
WIN.INI	TCPIP.INI

The mentioned files above need to be renamed manually, if the trojan has been executed.

Method of Infection

Method of Infection -

Trojans do not self-replicate. They are spread manually, often under the premise that the executable is something beneficial. Distribution channels include IRC, peer-to-peer networks, newsgroup postings, email, etc.

Removal -

Removal -

All Users :
Script,Batch,Macro and non memory-resident:
Use current engine and DAT files for detection and removal.

PE,Trojan,Internet Worm and memory resident :
Use specified engine and DAT files for detection. To remove, boot to MS-DOS mode or use a boot diskette and use the command line scanner:

SCANPM /ADL /CLEAN /ALL

Additional Windows ME/XP removal considerations

Users should not trust file icons, particularly when receiving files from others via P2P clients, IRC, email or other mediums where users can share files.

AVERT Recommended Updates :

* Office2000 Updates

* Malformed Word Document Could Enable Macro to Run Automatically (Information/Patch )

* scriptlet.typelib/Eyedog vulnerability patch

* Outlook as an email attachment security update

* Exchange 5.5 post SP3 Information Store Patch 5.5.2652.42 - this patch corrects detection issues with GroupShield

For a list of attachments blocked by the Outlook patch and a general FAQ, visit this link .
Additionally, Network Administrators can configure this update using an available tool - visit this link for more information .

It is very common for macro viruses to disable options within Office applications for example in Word, the macro protection warning commonly is disabled. After cleaning macro viruses, ensure that your previously set options are again enabled.

Variants

Variants -

N/A