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TROJ_AGENT_004558.TOMB

November 27, 2012
 ALIASES:

Trojan:Win32/BHO (Microsoft); Trojan-Dropper.Win32.NSIS.ys (Kaspersky); Trojan.Win32.Generic!BT (Sunbelt); Gen:Variant.Zusy.2885 (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:

118,775 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

27 Nov 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 creates the following folders:

  • %System Root%\DOCUME~1
  • %System Root%\DOCUME~1\ADMINI~1
  • %User Profile%\LOCALS~1
  • %User Temp%\nsq2.tmp

(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.. %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.. %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.)

Other System Modifications

This Trojan deletes the following files:

  • %User Temp%\nsq1.tmp
  • %User Temp%\nsq2.tmp

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.)

It adds the following registry keys:

HKEY_CLASSES_ROOT\CLSID\{54271926-2012-1195-951B-9EA34E34E8CC}

HKEY_CLASSES_ROOT\CLSID\{54271926-2012-1195-951B-9EA34E34E8CC}\
InprocServer32

HKEY_CLASSES_ROOT\CLSID\{54271926-2012-1195-951B-9EA34E34E8CC}\
ProgID

HKEY_CLASSES_ROOT\CLSID\{54271926-2012-1195-951B-9EA34E34E8CC}\
Programmable

HKEY_CLASSES_ROOT\CLSID\{54271926-2012-1195-951B-9EA34E34E8CC}\
TypeLib

HKEY_CLASSES_ROOT\CLSID\{54271926-2012-1195-951B-9EA34E34E8CC}\
VersionIndependentProgID

HKEY_CURRENT_USER\Software\Classes\
PROTOCOLS\Name-Space Handler\http\
{54271926-2012-1195-951B-9EA34E34E8CC}

HKEY_CURRENT_USER\Software\Classes\
PROTOCOLS\Name-Space Handler\about\
{54271926-2012-1195-951B-9EA34E34E8CC}

HKEY_LOCAL_MACHINE\Software\UniNode2610

It adds the following registry entries:

HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Main
Enable Browser Extensions = "No"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{54271926-2012-1195-951B-9EA34E34E8CC}
AppID = "{73A7FFA7-AA3A-49E5-A777-713B7DB78E9C}"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{54271926-2012-1195-951B-9EA34E34E8CC}\InprocServer32
ThreadingModel = "Apartment"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{54271926-2012-1195-951B-9EA34E34E8CC}\Programmable
1 = "1"

HKEY_CURRENT_USER\PROTOCOLS\Name-Space Handler\
http\{54271926-2012-1195-951B-9EA34E34E8CC}
CLSID = "{54271926-2012-1195-951B-9EA34E34E8CC}"

HKEY_CURRENT_USER\PROTOCOLS\Name-Space Handler\
about\{54271926-2012-1195-951B-9EA34E34E8CC}
CLSID = "{54271926-2012-1195-951B-9EA34E34E8CC}"

It deletes the following registry keys:

HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\URLSearchHooks

Dropping Routine

This Trojan drops the following files:

  • %User Temp%\nsq2.tmp\System.dll
  • %User Temp%\nsq2.tmp\JNsisExt.dll
  • %Program Files%\Internet Explorer\5427191126.dat

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.. %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000, Server 2003, and XP (32-bit), Vista (32-bit), and 7 (32-bit), or C:\Program Files (x86) in Windows XP (64-bit), Vista (64-bit), and 7 (64-bit).)

Other Details

This Trojan connects to the following possibly malicious URL:

  • http://www.{BLOCKED}8.com/ips8.asp

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine:

9.300

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

Delete this registry key

[ 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_CLASSES_ROOT\CLSID
    • {54271926-2012-1195-951B-9EA34E34E8CC}
  • In HKEY_CLASSES_ROOT\CLSID\{54271926-2012-1195-951B-9EA34E34E8CC}
    • InprocServer32
  • In HKEY_CLASSES_ROOT\CLSID\{54271926-2012-1195-951B-9EA34E34E8CC}
    • ProgID
  • In HKEY_CLASSES_ROOT\CLSID\{54271926-2012-1195-951B-9EA34E34E8CC}
    • Programmable
  • In HKEY_CLASSES_ROOT\CLSID\{54271926-2012-1195-951B-9EA34E34E8CC}
    • TypeLib
  • In HKEY_CLASSES_ROOT\CLSID\{54271926-2012-1195-951B-9EA34E34E8CC}
    • VersionIndependentProgID
  • In HKEY_CURRENT_USER\Software\Classes\PROTOCOLS\Name-Space Handler\http
    • {54271926-2012-1195-951B-9EA34E34E8CC}
  • In HKEY_CURRENT_USER\Software\Classes\PROTOCOLS\Name-Space Handler\about
    • {54271926-2012-1195-951B-9EA34E34E8CC}
  • In HKEY_LOCAL_MACHINE\Software
    • UniNode2610

Step 3

Delete this 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_CURRENT_USER\Software\Microsoft\Internet Explorer\Main
    • Enable Browser Extensions = "No"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{54271926-2012-1195-951B-9EA34E34E8CC}
    • AppID = "{73A7FFA7-AA3A-49E5-A777-713B7DB78E9C}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{54271926-2012-1195-951B-9EA34E34E8CC}\InprocServer32
    • ThreadingModel = "Apartment"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{54271926-2012-1195-951B-9EA34E34E8CC}\Programmable
    • 1 = "1"
  • In HKEY_CURRENT_USER\PROTOCOLS\Name-Space Handler\http\{54271926-2012-1195-951B-9EA34E34E8CC}
    • CLSID = "{54271926-2012-1195-951B-9EA34E34E8CC}"
  • In HKEY_CURRENT_USER\PROTOCOLS\Name-Space Handler\about\{54271926-2012-1195-951B-9EA34E34E8CC}
    • CLSID = "{54271926-2012-1195-951B-9EA34E34E8CC}"

Step 4

Search and delete these components

[ Learn More ]
There may be some components 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.
  • %User Temp%\nsq2.tmp\System.dll
  • %User Temp%\nsq2.tmp\JNsisExt.dll
  • %Program Files%\Internet Explorer\5427191126.dat

Step 5

Search and delete these folders

[ Learn More ]
Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden folders in the search result.
  • %System Root%\DOCUME~1
  • %System Root%\DOCUME~1\ADMINI~1
  • %User Profile%\LOCALS~1
  • %User Temp%\nsq2.tmp

Step 6

Scan your computer with your Trend Micro product to delete files detected as TROJ_AGENT_004558.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 7

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.

  • %User Temp%\nsq1.tmp
  • %User Temp%\nsq2.tmp

Step 8

Restore these deleted registry keys/values from backup

*Note: Only Microsoft-related keys/values will be restored. If the malware/grayware also deleted registry keys/values related to programs that are not from Microsoft, please reinstall those programs on your computer.

  • In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer
    • URLSearchHooks


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