TROJ_PASTA.PAGA

July 11, 2015
 ALIASES:

Trojan:Win32/Startpage.KR (Microsoft); [0007ac14.EXE]:RDN/Generic.bfr!ib (McAfee); Trojan.ADH (Symantec); Trojan.Win32.Phires.js (Kaspersky); Trojan.Win32.Generic!BT (Sunbelt); Trojan horse SHeur3.AITG (AVG)

 PLATFORM:

Windows

 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.

It deletes itself after execution.

  TECHNICAL DETAILS

File Size:

240,653 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

11 Jul 2015

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:

  • %Program Files%\Common Files\TaoBao

(Note: %Program Files% is the Program Files folder, where it usually is C:\Program Files on all Windows operating system versions; C:\Program Files (x86) for 32-bit applications running on Windows 64-bit operating systems.)

Other System Modifications

This Trojan deletes the following files:

  • %User Temp%\$$RAR1~1.TMP
  • %User Temp%\$RAR10~1.TMP
  • %Windows%\REGSOU~1.EXE
  • %Desktop%.ini
  • %User Profile%\QUICKL~1\Launch Internet Explorer Browser.lnk

(Note: %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.. %Windows% is the Windows folder, where it usually is C:\Windows on all Windows operating system versions.. %Desktop% is the desktop folder, where it usually is C:\Documents and Settings\{user name}\Desktop in Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\Desktop in Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.. %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.)

It adds the following registry keys:

HKEY_CLASSES_ROOT\.ur1

HKEY_CLASSES_ROOT\.ur1\PersistentHandler

HKEY_CLASSES_ROOT\.ur1\ShellEx

HKEY_CLASSES_ROOT\.ur1\ShellEx\
{000214EE-0000-0000-C000-000000000046}

HKEY_CLASSES_ROOT\.ur1\ShellEx\
{000214F9-0000-0000-C000-000000000046}

HKEY_CLASSES_ROOT\.ur1\ShellEx\
{00021500-0000-0000-C000-000000000046}

HKEY_CLASSES_ROOT\.ur1\ShellEx\
{CABB0DA0-DA57-11CF-9974-0020AFD79762}

HKEY_CLASSES_ROOT\.ur1\ShellEx\
{FBF23B80-E3F0-101B-8488-00AA003E56F8}

HKEY_CLASSES_ROOT\.1nk

HKEY_CLASSES_ROOT\.1nk\ShellEx

HKEY_CLASSES_ROOT\.1nk\ShellEx\
{000214EE-0000-0000-C000-000000000046}

HKEY_CLASSES_ROOT\.1nk\ShellEx\
{000214F9-0000-0000-C000-000000000046}

HKEY_CLASSES_ROOT\.1nk\ShellEx\
{00021500-0000-0000-C000-000000000046}

HKEY_CLASSES_ROOT\.1nk\ShellEx\
{BB2E617C-0920-11d1-9A0B-00C04FC2D6C1}

HKEY_CLASSES_ROOT\.1nk\ShellNew

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
DontShowMeThisDialogAgain

It adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
.1nk\ShellNew
Command = "rundll32.exe appwiz.cpl,NewLinkHere %1"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
DontShowMeThisDialogAgain
CompatWarningForwwwwwww.exe = "no"

It deletes the following registry keys:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
RunMRU

Dropping Routine

This Trojan drops the following files:

  • %Windows%\regsougoupy.exe
  • %Windows%\RtkSYUdp.exe
  • %Program Files%\Common Files\TaoBao\ÌÔ±¦.ico
  • %User Temp%\$rar10987.tmp
  • %User Temp%\$rar10943.tmp
  • %User Temp%\ÍøÖ·Ö®¼Ò.tmp
  • %Program Files%\Common Files\TaoBao\ÌÔ±¦.tmp
  • %User Temp%\hhhhhhh.tmp
  • %User Temp%\$$RAR110987.tmp
  • %User Temp%\wwwwwww.tmp
  • %Program Files%\Internet Explorer\SIGNUP\wwwwwww.exe

Other Details

This Trojan connects to the following possibly malicious URL:

  • {BLOCKED}0.1
  • {BLOCKED}6.189.29

It deletes itself after execution.

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine:

9.750

Step 1

Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.

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
    • .ur1
  • In HKEY_CLASSES_ROOT\.ur1
    • PersistentHandler
  • In HKEY_CLASSES_ROOT\.ur1
    • ShellEx
  • In HKEY_CLASSES_ROOT\.ur1\ShellEx
    • {000214EE-0000-0000-C000-000000000046}
  • In HKEY_CLASSES_ROOT\.ur1\ShellEx
    • {000214F9-0000-0000-C000-000000000046}
  • In HKEY_CLASSES_ROOT\.ur1\ShellEx
    • {00021500-0000-0000-C000-000000000046}
  • In HKEY_CLASSES_ROOT\.ur1\ShellEx
    • {CABB0DA0-DA57-11CF-9974-0020AFD79762}
  • In HKEY_CLASSES_ROOT\.ur1\ShellEx
    • {FBF23B80-E3F0-101B-8488-00AA003E56F8}
  • In HKEY_CLASSES_ROOT
    • .1nk
  • In HKEY_CLASSES_ROOT\.1nk
    • ShellEx
  • In HKEY_CLASSES_ROOT\.1nk\ShellEx
    • {000214EE-0000-0000-C000-000000000046}
  • In HKEY_CLASSES_ROOT\.1nk\ShellEx
    • {000214F9-0000-0000-C000-000000000046}
  • In HKEY_CLASSES_ROOT\.1nk\ShellEx
    • {00021500-0000-0000-C000-000000000046}
  • In HKEY_CLASSES_ROOT\.1nk\ShellEx
    • {BB2E617C-0920-11d1-9A0B-00C04FC2D6C1}
  • In HKEY_CLASSES_ROOT\.1nk
    • ShellNew
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer
    • DontShowMeThisDialogAgain

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_LOCAL_MACHINE\SOFTWARE\Classes\.1nk\ShellNew
    • Command = "rundll32.exe appwiz.cpl,NewLinkHere %1"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\DontShowMeThisDialogAgain
    • CompatWarningForwwwwwww.exe = "no"

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.
  • %Windows%\regsougoupy.exe
  • %Windows%\RtkSYUdp.exe
  • %Program Files%\Common Files\TaoBao\ÌÔ±¦.ico
  • %User Temp%\$rar10987.tmp
  • %User Temp%\$rar10943.tmp
  • %User Temp%\ÍøÖ·Ö®¼Ò.tmp
  • %Program Files%\Common Files\TaoBao\ÌÔ±¦.tmp
  • %User Temp%\hhhhhhh.tmp
  • %User Temp%\RAR110987.tmp
  • %User Temp%\wwwwwww.tmp
  • %Program Files%\Internet Explorer\SIGNUP\wwwwwww.exe
RAR110987.tmp
  • %User Temp%\wwwwwww.tmp
  • %Program Files%\Internet Explorer\SIGNUP\wwwwwww.exe
    •
  • In the Look In drop-down list, select My Computer then press Enter.
  • Once located, select the file then press SHIFT+DELETE to delete it.
    *Note: The file name input box title varies depending on the Windows version (e.g. Search for files or folders named or All or part of the file name.).

    • • For Windows Vista, Windows 7, Windows Server 2008, Windows 8, Windows 8.1, and Windows Server 2012:

    1. Open a Windows Explorer window.
      • For Windows Vista, 7, and Server 2008 users, click Start>Computer.
      • For Windows 8, 8.1, and Server 2012 users, right-click on the lower left corner of the screen,then click File Explorer.
    2. In the Search Computer/This PC input box, type:
      • %Windows%\regsougoupy.exe
      • %Windows%\RtkSYUdp.exe
      • %Program Files%\Common Files\TaoBao\ÌÔ±¦.ico
      • %User Temp%\$rar10987.tmp
      • %User Temp%\$rar10943.tmp
      • %User Temp%\ÍøÖ·Ö®¼Ò.tmp
      • %Program Files%\Common Files\TaoBao\ÌÔ±¦.tmp
      • %User Temp%\hhhhhhh.tmp
      • %User Temp%\RAR110987.tmp
      • %User Temp%\wwwwwww.tmp
      • %Program Files%\Internet Explorer\SIGNUP\wwwwwww.exe
    3. Once located, select the file then press SHIFT+DELETE to delete it.
      *Note: Read the following Microsoft page if these steps do not work on Windows 7.

    Step 5

    Search and delete this folder

    [ 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.
    • %Program Files%\Common Files\TaoBao

    Step 6

    Scan your computer with your Trend Micro product to delete files detected as TROJ_PASTA.PAGA. 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%\RAR1~1.TMP
    • %User Temp%\$RAR10~1.TMP
    • %Windows%\REGSOU~1.EXE
    • %Desktop%.ini
    • %User Profile%\QUICKL~1\Launch Internet Explorer Browser.lnk

    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\Windows\CurrentVersion\Explorer
      • RunMRU


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