TROJ_AGENT_036685.TOMB

October 13, 2012

ALIASES:

Virus:Win32/Autorun.NE (Microsoft); W32/Virut.n.gen (McAfee); Spyware.Keylogger, W32.Virut.CF (Symantec); Virus.Win32.Virut.ce (Kaspersky); Virus.Win32.Virut.ce (v) (Sunbelt); Trojan.Generic.3842741 (FSecure)

PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

OVERALL RISK RATING:

DAMAGE POTENTIAL:

DISTRIBUTION POTENTIAL:

REPORTED INFECTION:

Threat Type: Trojan
Destructiveness: No
Encrypted:
In the wild: Yes

OVERVIEW

This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

TECHNICAL DETAILS

File Size: 522,738 bytes

File Type: EXE

Memory Resident: Yes

Initial Samples Received Date: 30 Jun 2012

Arrival Details

This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Installation

This Trojan drops the following copies of itself into the affected system:

%System Root%\AutoRun.exe

(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)

Autostart Technique

This Trojan modifies the following registry entries to ensure it automatic execution at every system startup:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Winlogon
Shell = "Explorer.exe HelpMe.exe"

(Note: The default value data of the said registry entry is Explorer.exe.)

Other System Modifications

This Trojan deletes the following files:

%System Root%\AUTOEXEC.BAT
%System Root%\AUTORUN.INF
%System Root%\boot.ini
%System Root%\CONFIG.SYS
%Desktop%.ini
%User Profile%\Address Book\Administrator.wab
%User Profile%\Address Book\Administrator.wab~
%User Profile%\Internet Explorer\brndlog.bak
%User Profile%\Internet Explorer\brndlog.txt
%Desktop%.htt
%User Profile%\Quick Launch\Launch Internet Explorer Browser.lnk
%User Profile%\Quick Launch\Show Desktop.scf
%User Profile%\Themes\Custom.theme
%User Profile%\Cookies\index.dat
%Favorites%\Links\Customize Links.url
%Favorites%\Links\Free Hotmail.url
%Favorites%\Links\Windows Marketplace.url
%Favorites%\Links\Windows Media.url
%Favorites%\Links\Windows.url
%Favorites%\MSN.com.url
%Favorites%\Radio Station Guide.url
%Application Data%\IconCache.db
%Application Data%\Identities\{341F68BA-C841-4200-A7B4-3D5CFF202166}\Microsoft\Outlook Express\Folders.dbx
%Application Data%\Identities\{341F68BA-C841-4200-A7B4-3D5CFF202166}\Microsoft\Outlook Express\Inbox.dbx
%Application Data%\Identities\{341F68BA-C841-4200-A7B4-3D5CFF202166}\Microsoft\Outlook Express\Offline.dbx
%Application Data%\Identities\{341F68BA-C841-4200-A7B4-3D5CFF202166}\Microsoft\Outlook Express\Outbox.dbx
%Application Data%\Microsoft\Internet Explorer\MSIMGSIZ.DAT
%Application Data%\Microsoft\Media Player\CurrentDatabase_59R.wmdb

It modifies the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Explorer\
Advanced\Folder\Hidden\
SHOWALL
CheckedValue = "0"

(Note: The default value data of the said registry entry is 1.)

Dropping Routine

This Trojan drops the following files:

%System%\HelpMe.exe
%User Temp%\?wpl version=1.0?smil head meta name=Generator content=Microsoft Windows Media Player -- 9.0.0.2773/ titleFavorites -- Listen to at night/title /head body seq
%System Root%\AUTOEXEC.BAT.exe
%System Root%\AUTORUN.INF.exe
%System Root%\boot.ini.exe
%System Root%\CONFIG.SYS.exe
%Desktop%.ini.exe
%User Profile%\Address Book\Administrator.wab.exe
%User Profile%\Address Book\Administrator.wab~.exe
%User Startup%\Soft.lnk
%User Profile%\Internet Explorer\brndlog.bak.exe
%User Profile%\Internet Explorer\brndlog.txt.exe
%Desktop%.htt.exe
%User Profile%\Quick Launch\Launch Internet Explorer Browser.lnk.exe
%User Profile%\Quick Launch\Show Desktop.scf.exe
%User Profile%\Themes\Custom.theme.exe
%User Profile%\Cookies\index.dat.exe
%Favorites%\Links\Customize Links.url.exe
%Favorites%\Links\Free Hotmail.url.exe
%Favorites%\Links\Windows Marketplace.url.exe
%Favorites%\Links\Windows Media.url.exe
%Favorites%\Links\Windows.url.exe
%Favorites%\MSN.com.url.exe
%Favorites%\Radio Station Guide.url.exe
%Application Data%\IconCache.db.exe
%Application Data%\Identities\{341F68BA-C841-4200-A7B4-3D5CFF202166}\Microsoft\Outlook Express\Folders.dbx.exe
%Application Data%\Identities\{341F68BA-C841-4200-A7B4-3D5CFF202166}\Microsoft\Outlook Express\Inbox.dbx.exe
%Application Data%\Identities\{341F68BA-C841-4200-A7B4-3D5CFF202166}\Microsoft\Outlook Express\Offline.dbx.exe
%Application Data%\Identities\{341F68BA-C841-4200-A7B4-3D5CFF202166}\Microsoft\Outlook Express\Outbox.dbx.exe
%Application Data%\Microsoft\Internet Explorer\MSIMGSIZ.DAT.exe
%Application Data%\Microsoft\Media Player\CurrentDatabase_59R.wmdb.exe
%System Root%\AutoRun.exe

This report is generated via an automated analysis system.

SOLUTION

Minimum Scan Engine: 9.200

Step 1

For Windows XP and Windows Server 2003 users, before doing any scans, please make sure you disable System Restore to allow full scanning of your computer.

Step 2

Identify and delete files detected as TROJ_AGENT_036685.TOMB using either the Startup Disk or Recovery Console

[ Learn More ]

Step 3

Restore this modified registry value

[ Learn More ]

Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.

In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced\Folder\Hidden\SHOWALL
- From: CheckedValue = "0"
  To: CheckedValue = ""1""

In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon
- From: Shell = "Explorer.exe HelpMe.exe"
  To: Shell = ""Explorer.exe""

Step 4

Search and delete these files

[ Learn More ]

There may be some component files that are hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the "More advanced options" option to include all hidden files and folders in the search result.

%System%\HelpMe.exe
%User Temp%\?wpl version=1.0?smil head meta name=Generator content=Microsoft Windows Media Player -- 9.0.0.2773/ titleFavorites -- Listen to at night/title /head body seq
%System Root%\AUTOEXEC.BAT.exe
%System Root%\AUTORUN.INF.exe
%System Root%\boot.ini.exe
%System Root%\CONFIG.SYS.exe
%Desktop%.ini.exe
%User Profile%\Address Book\Administrator.wab.exe
%User Profile%\Address Book\Administrator.wab~.exe
%User Startup%\Soft.lnk
%User Profile%\Internet Explorer\brndlog.bak.exe
%User Profile%\Internet Explorer\brndlog.txt.exe
%Desktop%.htt.exe
%User Profile%\Quick Launch\Launch Internet Explorer Browser.lnk.exe
%User Profile%\Quick Launch\Show Desktop.scf.exe
%User Profile%\Themes\Custom.theme.exe
%User Profile%\Cookies\index.dat.exe
%Favorites%\Links\Customize Links.url.exe
%Favorites%\Links\Free Hotmail.url.exe
%Favorites%\Links\Windows Marketplace.url.exe
%Favorites%\Links\Windows Media.url.exe
%Favorites%\Links\Windows.url.exe
%Favorites%\MSN.com.url.exe
%Favorites%\Radio Station Guide.url.exe
%Application Data%\IconCache.db.exe
%Application Data%\Identities\{341F68BA-C841-4200-A7B4-3D5CFF202166}\Microsoft\Outlook Express\Folders.dbx.exe
%Application Data%\Identities\{341F68BA-C841-4200-A7B4-3D5CFF202166}\Microsoft\Outlook Express\Inbox.dbx.exe
%Application Data%\Identities\{341F68BA-C841-4200-A7B4-3D5CFF202166}\Microsoft\Outlook Express\Offline.dbx.exe
%Application Data%\Identities\{341F68BA-C841-4200-A7B4-3D5CFF202166}\Microsoft\Outlook Express\Outbox.dbx.exe
%Application Data%\Microsoft\Internet Explorer\MSIMGSIZ.DAT.exe
%Application Data%\Microsoft\Media Player\CurrentDatabase_59R.wmdb.exe
%System Root%\AutoRun.exe

To delete malware/grayware component files:

Search for the following files:

%System%\HelpMe.exe
%User Temp%\?wpl version=1.0?smil head meta name=Generator content=Microsoft Windows Media Player -- 9.0.0.2773/ titleFavorites -- Listen to at night/title /head body seq
%System Root%\AUTOEXEC.BAT.exe
%System Root%\AUTORUN.INF.exe
%System Root%\boot.ini.exe
%System Root%\CONFIG.SYS.exe
%Desktop%.ini.exe
%User Profile%\Address Book\Administrator.wab.exe
%User Profile%\Address Book\Administrator.wab~.exe
%User Startup%\Soft.lnk
%User Profile%\Internet Explorer\brndlog.bak.exe
%User Profile%\Internet Explorer\brndlog.txt.exe
%Desktop%.htt.exe
%User Profile%\Quick Launch\Launch Internet Explorer Browser.lnk.exe
%User Profile%\Quick Launch\Show Desktop.scf.exe
%User Profile%\Themes\Custom.theme.exe
%User Profile%\Cookies\index.dat.exe
%Favorites%\Links\Customize Links.url.exe
%Favorites%\Links\Free Hotmail.url.exe
%Favorites%\Links\Windows Marketplace.url.exe
%Favorites%\Links\Windows Media.url.exe
%Favorites%\Links\Windows.url.exe
%Favorites%\MSN.com.url.exe
%Favorites%\Radio Station Guide.url.exe
%Application Data%\IconCache.db.exe
%Application Data%\Identities\{341F68BA-C841-4200-A7B4-3D5CFF202166}\Microsoft\Outlook Express\Folders.dbx.exe
%Application Data%\Identities\{341F68BA-C841-4200-A7B4-3D5CFF202166}\Microsoft\Outlook Express\Inbox.dbx.exe
%Application Data%\Identities\{341F68BA-C841-4200-A7B4-3D5CFF202166}\Microsoft\Outlook Express\Offline.dbx.exe
%Application Data%\Identities\{341F68BA-C841-4200-A7B4-3D5CFF202166}\Microsoft\Outlook Express\Outbox.dbx.exe
%Application Data%\Microsoft\Internet Explorer\MSIMGSIZ.DAT.exe
%Application Data%\Microsoft\Media Player\CurrentDatabase_59R.wmdb.exe
%System Root%\AutoRun.exe

Note: To do a search for the following files, right-click Start then click Search... or Find..., depending on the version of Windows you are running. For each file to be deleted, type its file name in the Named input box. In the Look In drop-down list, select My Computer, then press Enter.
Once located, select the file then press SHIFT+DELETE to permanently delete the file.
Repeat the said steps for all files listed.

Step 5

Scan your computer with your Trend Micro product to delete files detected as TROJ_AGENT_036685.TOMB. If the detected files have already been cleaned, deleted, or quarantined by your Trend Micro product, no further step is required. You may opt to simply delete the quarantined files. Please check this Knowledge Base page for more information.

Step 6

Restore this file from backup only Microsoft-related files will be restored. If this malware/grayware also deleted files related to programs that are not from Microsoft, please reinstall those programs on you computer again.

%System Root%\AUTOEXEC.BAT
%System Root%\AUTORUN.INF
%System Root%\boot.ini
%System Root%\CONFIG.SYS
%Desktop%.ini
%User Profile%\Address Book\Administrator.wab
%User Profile%\Address Book\Administrator.wab~
%User Profile%\Internet Explorer\brndlog.bak
%User Profile%\Internet Explorer\brndlog.txt
%Desktop%.htt
%User Profile%\Quick Launch\Launch Internet Explorer Browser.lnk
%User Profile%\Quick Launch\Show Desktop.scf
%User Profile%\Themes\Custom.theme
%User Profile%\Cookies\index.dat
%Favorites%\Links\Customize Links.url
%Favorites%\Links\Free Hotmail.url
%Favorites%\Links\Windows Marketplace.url
%Favorites%\Links\Windows Media.url
%Favorites%\Links\Windows.url
%Favorites%\MSN.com.url
%Favorites%\Radio Station Guide.url
%Application Data%\IconCache.db
%Application Data%\Identities\{341F68BA-C841-4200-A7B4-3D5CFF202166}\Microsoft\Outlook Express\Folders.dbx
%Application Data%\Identities\{341F68BA-C841-4200-A7B4-3D5CFF202166}\Microsoft\Outlook Express\Inbox.dbx
%Application Data%\Identities\{341F68BA-C841-4200-A7B4-3D5CFF202166}\Microsoft\Outlook Express\Offline.dbx
%Application Data%\Identities\{341F68BA-C841-4200-A7B4-3D5CFF202166}\Microsoft\Outlook Express\Outbox.dbx
%Application Data%\Microsoft\Internet Explorer\MSIMGSIZ.DAT
%Application Data%\Microsoft\Media Player\CurrentDatabase_59R.wmdb

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