Content

Renamer.c

Type
Trojan
SubType
-
Discovery Date
01/29/2003
Length
1616 bytes
Minimum DAT
4246 (02/05/2003)
Updated DAT
4246 (02/05/2003)
Minimum Engine
5.1.00
Description Added
01/29/2003
Description Modified
01/29/2003 9:22 AM (PT)
Risk Assessment
Corporate User
Low
Home User
Low

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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