TROJ_PAM_0000040678.T3


 ALIASES:

Program:Win32/Pameseg (Microsoft); ARC:NSIS, PAK:[htmlayout.dll]:UPX, [winzipninfo]:Hoax.NSIS.ArchSMS.i, [winzipninfo]:Hoax.NSIS.ArchSM (Kaspersky); Trojan.Win32.Generic.pak!cobra (Sunbelt); Trojan.Generic.6670872 (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:

13,300,576 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

20 Jul 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%\Documents and Settings\Wilbert
  • %User Profile%\Application Data\zipustartfree
  • %System Root%\DOCUME~1
  • %System Root%\DOCUME~1\Wilbert
  • %User Profile%\LOCALS~1
  • %User Temp%\nse3.tmp
  • %User Profile%\Application Data\TEMP

(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:\Windows\Profiles\{user name} on Windows 98 and ME, C:\WINNT\Profiles\{user name} on Windows NT, and C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003.. %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.)

Autostart Technique

This Trojan adds the following registry entries to enable its automatic execution at every system startup:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
winxgz = "%User Profile%\zipustartfree\zipustartfree.exe autostart "

Other System Modifications

This Trojan deletes the following files:

  • %User Temp%\nsi1.tmp
  • %User Temp%\nse3.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.)

It adds the following registry keys:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
SystemCertificates\ROOT\Certificates\
F9E4357AE7F729BFBFB8693E65B41ADCA3507F71

HKEY_CURRENT_USER\Software\winxgz

HKEY_LOCAL_MACHINE\Software\Licenses

HKEY_CLASSES_ROOT\CLSID\{7E0F3F10-7B69-8C21-EE01-70DABCF57934}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{7E0F3F10-7B69-8C21-EE01-70DABCF57934}\Implemented Categories

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{7E0F3F10-7B69-8C21-EE01-70DABCF57934}\Implemented Categories\
{0DE86A57-2BAA-11CF-A229-00AA003D7352}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{7E0F3F10-7B69-8C21-EE01-70DABCF57934}\Implemented Categories\
{7DD95801-9882-11CF-9FA9-00AA006C42C4}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{7E0F3F10-7B69-8C21-EE01-70DABCF57934}\Implemented Categories\
{7DD95802-9882-11CF-9FA9-00AA006C42C4}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{7E0F3F10-7B69-8C21-EE01-70DABCF57934}\InprocServer32

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{7E0F3F10-7B69-8C21-EE01-70DABCF57934}\ProgID

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{7E0F3F10-7B69-8C21-EE01-70DABCF57934}\Programmable

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{7E0F3F10-7B69-8C21-EE01-70DABCF57934}\TypeLib

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{7E0F3F10-7B69-8C21-EE01-70DABCF57934}\VersionIndependentProgID

It adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
SystemCertificates\ROOT\Certificates\
F9E4357AE7F729BFBFB8693E65B41ADCA3507F71
Blob = "{random values}"

HKEY_CURRENT_USER\Software\winxgz
Installer File = "{malware path and file name}"

HKEY_LOCAL_MACHINE\SOFTWARE\Licenses
{K7C0DB872A3F777C0} = "{random values}"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{7E0F3F10-7B69-8C21-EE01-70DABCF57934}\InprocServer32
ThreadingModel = "Apartment"

HKEY_LOCAL_MACHINE\SOFTWARE\Licenses
{I72A1C76714CAA996} = "{random values}"

HKEY_CURRENT_USER\Software\winxgz
fs = "1327267778"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
WBEM\WDM
%System%\advapi32.dll[MofResourceName] = "{random characters}"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
WBEM\WDM
%System%\DRIVERS\ACPI.sys[ACPIMOFResource] = "{random characters}"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
WBEM\WDM
%System%\DRIVERS\mssmbios.sys[MofResource] = "{random characters}"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
WBEM\WDM
%System%\DRIVERS\intelppm.sys[PROCESSORWMI] = "{random characters}"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
WBEM\WDM
%System%\DRIVERS\ipnat.sys[IPNATMofResource] = "{random characters}"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
WBEM\WDM
%System%\Drivers\HTTP.sys[UlMofResource] = "{random characters}"

It modifies the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
RFC1156Agent\CurrentVersion\Parameters
TrapPollTimeMilliSecs = "3a98"

(Note: The default value data of the said registry entry is 3a98.)

It deletes the following registry keys:

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{7E0F3F10-7B69-8C21-EE01-70DABCF57934}\Version

Dropping Routine

This Trojan drops the following files:

  • %User Temp%\nsn2.tmp
  • %User Profile%\zipustartfree\MyriadWebPro-Condensed.ttf
  • %User Profile%\zipustartfree\css.css
  • %User Profile%\zipustartfree\dir.png
  • %User Profile%\zipustartfree\dot.gif
  • %User Profile%\zipustartfree\foot.png
  • %User Profile%\zipustartfree\htmlayout.dll
  • %User Profile%\zipustartfree\logo.png
  • %User Profile%\zipustartfree\logo2.png
  • %User Profile%\zipustartfree\logo2m.png
  • %User Profile%\zipustartfree\ogurchennikov59287
  • %User Profile%\zipustartfree\omarbanan782
  • %User Profile%\zipustartfree\rules.css
  • %User Profile%\zipustartfree\sb-h-scroll-next.png
  • %User Profile%\zipustartfree\sb-h-scroll-prev.png
  • %User Profile%\zipustartfree\sb-scroll-back.png
  • %User Profile%\zipustartfree\sb-scroll-base.png
  • %User Profile%\zipustartfree\sb-scroll-slider.png
  • %User Profile%\zipustartfree\sb-v-scroll-next.png
  • %User Profile%\zipustartfree\sb-v-scroll-prev.png
  • %User Profile%\zipustartfree\scroll.css
  • %User Profile%\zipustartfree\sert.cer
  • %User Profile%\zipustartfree\winzipninfo
  • %User Profile%\zipustartfree\yamurilkin298
  • %User Temp%\nse3.tmp\System.dll
  • %User Temp%\nse3.tmp\ogurchennikov59287.marg.puh
  • %User Temp%\nse3.tmp\Release.dll
  • ogurchennikov59287.marg
  • %User Temp%\nse3.tmp\yamurilkin298.marg.puh
  • yamurilkin298.marg
  • %User Temp%\nse3.tmp\omarbanan782.marg.puh
  • omarbanan782.marg
  • %User Profile%\Application Data\TEMP:BF14D50A

(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.. %User Profile% is the current user's profile folder, which is usually C:\Windows\Profiles\{user name} on Windows 98 and ME, C:\WINNT\Profiles\{user name} on Windows NT, and C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003.)

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

Restart in Safe Mode

[ Learn More ]

Step 3

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_LOCAL_MACHINE\SOFTWARE\Microsoft\SystemCertificates\ROOT\Certificates
    • F9E4357AE7F729BFBFB8693E65B41ADCA3507F71
  • In HKEY_CURRENT_USER\Software
    • winxgz
  • In HKEY_LOCAL_MACHINE\Software
    • Licenses
  • In HKEY_CLASSES_ROOT\CLSID
    • {7E0F3F10-7B69-8C21-EE01-70DABCF57934}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{7E0F3F10-7B69-8C21-EE01-70DABCF57934}
    • Implemented Categories
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{7E0F3F10-7B69-8C21-EE01-70DABCF57934}\Implemented Categories
    • {0DE86A57-2BAA-11CF-A229-00AA003D7352}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{7E0F3F10-7B69-8C21-EE01-70DABCF57934}\Implemented Categories
    • {7DD95801-9882-11CF-9FA9-00AA006C42C4}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{7E0F3F10-7B69-8C21-EE01-70DABCF57934}\Implemented Categories
    • {7DD95802-9882-11CF-9FA9-00AA006C42C4}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{7E0F3F10-7B69-8C21-EE01-70DABCF57934}
    • InprocServer32
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{7E0F3F10-7B69-8C21-EE01-70DABCF57934}
    • ProgID
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{7E0F3F10-7B69-8C21-EE01-70DABCF57934}
    • Programmable
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{7E0F3F10-7B69-8C21-EE01-70DABCF57934}
    • TypeLib
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{7E0F3F10-7B69-8C21-EE01-70DABCF57934}
    • VersionIndependentProgID

Step 4

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_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
    • winxgz = "%User Profile%\zipustartfree\zipustartfree.exe autostart "
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\SystemCertificates\ROOT\Certificates\F9E4357AE7F729BFBFB8693E65B41ADCA3507F71
    • Blob = "{random values}"
  • In HKEY_CURRENT_USER\Software\winxgz
    • Installer File = "{malware path and file name}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Licenses
    • {K7C0DB872A3F777C0} = "{random values}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{7E0F3F10-7B69-8C21-EE01-70DABCF57934}\InprocServer32
    • ThreadingModel = "Apartment"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Licenses
    • {I72A1C76714CAA996} = "{random values}"
  • In HKEY_CURRENT_USER\Software\winxgz
    • fs = "1327267778"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\WBEM\WDM
    • %System%\advapi32.dll[MofResourceName] = "{random characters}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\WBEM\WDM
    • %System%\DRIVERS\ACPI.sys[ACPIMOFResource] = "{random characters}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\WBEM\WDM
    • %System%\DRIVERS\mssmbios.sys[MofResource] = "{random characters}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\WBEM\WDM
    • %System%\DRIVERS\intelppm.sys[PROCESSORWMI] = "{random characters}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\WBEM\WDM
    • %System%\DRIVERS\ipnat.sys[IPNATMofResource] = "{random characters}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\WBEM\WDM
    • %System%\Drivers\HTTP.sys[UlMofResource] = "{random characters}"

Step 5

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\RFC1156Agent\CurrentVersion\Parameters
    • From: TrapPollTimeMilliSecs = "3a98"
      To: TrapPollTimeMilliSecs = ""3a98""

Step 6

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.
  • %User Temp%\nsn2.tmp
  • %User Profile%\zipustartfree\MyriadWebPro-Condensed.ttf
  • %User Profile%\zipustartfree\css.css
  • %User Profile%\zipustartfree\dir.png
  • %User Profile%\zipustartfree\dot.gif
  • %User Profile%\zipustartfree\foot.png
  • %User Profile%\zipustartfree\htmlayout.dll
  • %User Profile%\zipustartfree\logo.png
  • %User Profile%\zipustartfree\logo2.png
  • %User Profile%\zipustartfree\logo2m.png
  • %User Profile%\zipustartfree\ogurchennikov59287
  • %User Profile%\zipustartfree\omarbanan782
  • %User Profile%\zipustartfree\rules.css
  • %User Profile%\zipustartfree\sb-h-scroll-next.png
  • %User Profile%\zipustartfree\sb-h-scroll-prev.png
  • %User Profile%\zipustartfree\sb-scroll-back.png
  • %User Profile%\zipustartfree\sb-scroll-base.png
  • %User Profile%\zipustartfree\sb-scroll-slider.png
  • %User Profile%\zipustartfree\sb-v-scroll-next.png
  • %User Profile%\zipustartfree\sb-v-scroll-prev.png
  • %User Profile%\zipustartfree\scroll.css
  • %User Profile%\zipustartfree\sert.cer
  • %User Profile%\zipustartfree\winzipninfo
  • %User Profile%\zipustartfree\yamurilkin298
  • %User Temp%\nse3.tmp\System.dll
  • %User Temp%\nse3.tmp\ogurchennikov59287.marg.puh
  • %User Temp%\nse3.tmp\Release.dll
  • ogurchennikov59287.marg
  • %User Temp%\nse3.tmp\yamurilkin298.marg.puh
  • yamurilkin298.marg
  • %User Temp%\nse3.tmp\omarbanan782.marg.puh
  • omarbanan782.marg
  • %User Profile%\Application Data\TEMP:BF14D50A

Step 7

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%\Documents and Settings\Wilbert
  • %User Profile%\Application Data\zipustartfree
  • %System Root%\DOCUME~1
  • %System Root%\DOCUME~1\Wilbert
  • %User Profile%\LOCALS~1
  • %User Temp%\nse3.tmp
  • %User Profile%\Application Data\TEMP

Step 8

Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_PAM_0000040678.T3. 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 9

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%\nsi1.tmp
  • %User Temp%\nse3.tmp

Step 10

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_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{7E0F3F10-7B69-8C21-EE01-70DABCF57934}
    • Version


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