TROJ_AGKT.SMUS5


 ALIASES:

TrojanDownloader:Win32/Small.WY (Microsoft); Generic Dropper!dxw (McAfee); Trojan.Gen (Symantec); PAK:PE_Patch.PECompact, PAK:PecBundle, PAK:PECompact, Trojan-Dropper.Win32.Agent.exvc (Kaspersky); Trojan.Win32.Generic.pak!cobra (Sunbelt); Trojan.Fakealert.26180 (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.

It deletes itself after execution.

  TECHNICAL DETAILS

File Size:

75,794 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

05 Mar 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:

  • %Program Files%\FreeRapid
  • %User Profile%\Application Data\PIPI
  • %System Root%\zwok
  • %Windows%\LastGood
  • %Windows%\LastGood\INF
  • %Program Files%\FREERA~1\tmp
  • %Program Files%\FREERA~1\tmp\a.{971C5380-92A0-5A69-B3EE-C3002B33309E}

(Note: %Program Files% is the default Program Files folder, usually C:\Program Files.. %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.. %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.. %Windows% is the Windows folder, which is usually C:\Windows or C:\WINNT.)

Other System Modifications

This Trojan deletes the following files:

  • %User Profile%\Application Data\2.tmp
  • %System Root%\359679~1.AQQ
  • %System Root%\AFC9FE~1.BAT
  • %User Temp%\inl3.tmp
  • %User Temp%\setup_kankan.exe
  • %User Temp%\360moheInstall.exe
  • %Windows%\fonts\msgothic.ttf
  • %Windows%\fonts\msuigoth.ttf
  • %Windows%\fonts\MSMINCHO.TTF
  • %Windows%\fonts\Gulim.ttf
  • %Windows%\fonts\Gulimche.ttf
  • %Windows%\fonts\Dotum.ttf
  • %Windows%\fonts\Batang.ttf
  • %Windows%\fonts\Gungsuh.ttf
  • %Windows%\fonts\Simsun.ttf
  • %Windows%\fonts\nsimsun.ttf
  • %Windows%\fonts\MingLiU.ttf
  • %Windows%\fonts\pmingliu.ttf
  • %Windows%\INF\oem12.inf

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

It adds the following registry keys:

HKEY_LOCAL_MACHINE\SOFTWARE\WinRAR

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
SystemCertificates\ROOT\Certificates\
68A12DE4422589E97E1C6396FE17B5024FE0547A

HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\International\CpMRU

HKEY_CURRENT_USER\Software\tmp

HKEY_CLASSES_ROOT\CLSID\{971C5380-92A0-5A69-B3EE-C3002B33309E}

HKEY_CLASSES_ROOT\CLSID\{971C5380-92A0-5A69-B3EE-C3002B33309E}\
Shell\open(&H)\Command

It adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\WinRAR
zmzzmzwbd12 = "zmzzmzwbd12"

HKEY_LOCAL_MACHINE\SOFTWARE\WinRAR
uid = "849ba482ba41d6e4991acd3de3b2aaee"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
SystemCertificates\ROOT\Certificates\
68A12DE4422589E97E1C6396FE17B5024FE0547A
Blob = "{random values}"

HKEY_LOCAL_MACHINE\SOFTWARE\WinRAR
hp = "{random values}"

HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\International\CpMRU
Enable = "1"

HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\International\CpMRU
Size = "a"

HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\International\CpMRU
InitHits = "64"

HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\International\CpMRU
Factor = "14"

HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\International
W2KLpk = "1"

HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\International
W2KLpk = "0"

HKEY_CURRENT_USER\Software\tmp
key = "http://www.{BLOCKED}3.com/?r"

HKEY_CLASSES_ROOT
.grp = "MSProgramGroup"

HKEY_CLASSES_ROOT
MSProgramGroup = "Microsoft Program Group"

HKEY_CLASSES_ROOT
MSProgramGroup\Shell\Open\Command = "%System%\grpconv.exe %1"

It modifies the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Internet Explorer\Main
Start Page = "http://www.{BLOCKED}3.com/?r"

(Note: The default value data of the said registry entry is http://www.microsoft.com/isapi/redir.dll?prd={SUB_PRD}&clcid={SUB_CLSID}&pver={SUB_PVER}&ar=home.)

HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Main
Start Page = "http://www.{BLOCKED}3.com/?r"

(Note: The default value data of the said registry entry is http://www.microsoft.com/isapi/redir.dll?prd=ie&pver=6&ar=msnhome.)

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\GrpConv
Log = "Init Application."

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

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\GrpConv
Log = "bdg: ..."

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

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\GrpConv
Log = "bdg: Done."

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

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\GrpConv
Log = "dros: ..."

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

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\GrpConv
Log = "dros: Renames."

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

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\GrpConv
Log = "dros: Copies."

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

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\GrpConv
Log = "dros: Deletes."

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

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\GrpConv
Log = "dros: Done."

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

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\GrpConv
Log = "Uninit Application."

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

Dropping Routine

This Trojan drops the following files:

  • %User Temp%\winrar_config.tmp
  • %Program Files%\FreeRapid\resd.bin
  • %User Profile%\PIPI\bagua.ico
  • %User Profile%\PIPI\kankan.ico
  • %User Profile%\PIPI\meinv.ico
  • %User Profile%\PIPI\taobao.ico
  • %User Profile%\PIPI\1000tuan.ico
  • %Program Files%\FreeRapid\1.bat
  • %Program Files%\FreeRapid\2.bat
  • %Program Files%\FreeRapid\4.bat
  • %User Profile%\Application Data\sampe.tmp
  • %System Root%\zwok\zxok.bat
  • %User Profile%\Application Data\smap.tmp
  • %Windows%\Comres.dll
  • afc9fe2f418b00a0.bat
  • %User Temp%\wl0910198.exe
  • %User Temp%\FunshionInstall.exe
  • %User Temp%\GLB6.tmp
  • %Program Files%\INTERN~1\ieframe.dll

(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.. %Program Files% is the default Program Files folder, usually C:\Program Files.. %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.. %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.. %Windows% is the Windows folder, which is usually C:\Windows or C:\WINNT.)

Other Details

This Trojan connects to the following possibly malicious URL:

  • http://kp.{BLOCKED}n.net/badboy.mp3
  • http://jump3.{BLOCKED}8.com:27889/report3.ashx?{random characters}
  • http://bofangqi.{BLOCKED}g.cn/jm_setup_qvod.exe
  • http://mohe.{BLOCKED}g.cn:8012/360mohesetup.exe
  • http://down3.{BLOCKED}k.com.cn/wl0910198.exe

It deletes itself after execution.

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

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
    • WinRAR
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\SystemCertificates\ROOT\Certificates
    • 68A12DE4422589E97E1C6396FE17B5024FE0547A
  • In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\International
    • CpMRU
  • In HKEY_CURRENT_USER\Software
    • tmp
  • In HKEY_CLASSES_ROOT\CLSID
    • {971C5380-92A0-5A69-B3EE-C3002B33309E}
  • In HKEY_CLASSES_ROOT\CLSID\{971C5380-92A0-5A69-B3EE-C3002B33309E}\Shell\open(&H)
    • Command

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\WinRAR
    • zmzzmzwbd12 = "zmzzmzwbd12"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\WinRAR
    • uid = "849ba482ba41d6e4991acd3de3b2aaee"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\SystemCertificates\ROOT\Certificates\68A12DE4422589E97E1C6396FE17B5024FE0547A
    • Blob = "{random values}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\WinRAR
    • hp = "{random values}"
  • In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\International\CpMRU
    • Enable = "1"
  • In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\International\CpMRU
    • Size = "a"
  • In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\International\CpMRU
    • InitHits = "64"
  • In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\International\CpMRU
    • Factor = "14"
  • In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\International
    • W2KLpk = "1"
  • In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\International
    • W2KLpk = "0"
  • In HKEY_CURRENT_USER\Software\tmp
    • key = "http://www.{BLOCKED}3.com/?r"
  • In HKEY_CLASSES_ROOT
    • .grp = "MSProgramGroup"
  • In HKEY_CLASSES_ROOT
    • MSProgramGroup = "Microsoft Program Group"
  • In HKEY_CLASSES_ROOT
    • MSProgramGroup\Shell\Open\Command = "%System%\grpconv.exe %1"

Step 4

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\Internet Explorer\Main
    • From: Start Page = "http://www.{BLOCKED}3.com/?r"
      To: Start Page = ""http://www.microsoft.com/isapi/redir.dll?prd={SUB_PRD}&clcid={SUB_CLSID}&pver={SUB_PVER}&ar=home""
  • In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main
    • From: Start Page = "http://www.{BLOCKED}3.com/?r"
      To: Start Page = ""http://www.microsoft.com/isapi/redir.dll?prd=ie&pver=6&ar=msnhome""
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\GrpConv
    • From: Log = "Init Application."
      To: Log = ""Uninit Application.""
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\GrpConv
    • From: Log = "bdg: ..."
      To: Log = ""Uninit Application.""
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\GrpConv
    • From: Log = "bdg: Done."
      To: Log = ""Uninit Application.""
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\GrpConv
    • From: Log = "dros: ..."
      To: Log = ""Uninit Application.""
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\GrpConv
    • From: Log = "dros: Renames."
      To: Log = ""Uninit Application.""
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\GrpConv
    • From: Log = "dros: Copies."
      To: Log = ""Uninit Application.""
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\GrpConv
    • From: Log = "dros: Deletes."
      To: Log = ""Uninit Application.""
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\GrpConv
    • From: Log = "dros: Done."
      To: Log = ""Uninit Application.""
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\GrpConv
    • From: Log = "Uninit Application."
      To: Log = ""Uninit Application.""

Step 5

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%\winrar_config.tmp
  • %Program Files%\FreeRapid\resd.bin
  • %User Profile%\PIPI\bagua.ico
  • %User Profile%\PIPI\kankan.ico
  • %User Profile%\PIPI\meinv.ico
  • %User Profile%\PIPI\taobao.ico
  • %User Profile%\PIPI\1000tuan.ico
  • %Program Files%\FreeRapid\1.bat
  • %Program Files%\FreeRapid\2.bat
  • %Program Files%\FreeRapid\4.bat
  • %User Profile%\Application Data\sampe.tmp
  • %System Root%\zwok\zxok.bat
  • %User Profile%\Application Data\smap.tmp
  • %Windows%\Comres.dll
  • afc9fe2f418b00a0.bat
  • %User Temp%\wl0910198.exe
  • %User Temp%\FunshionInstall.exe
  • %User Temp%\GLB6.tmp
  • %Program Files%\INTERN~1\ieframe.dll

Step 6

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.
  • %Program Files%\FreeRapid
  • %User Profile%\Application Data\PIPI
  • %System Root%\zwok
  • %Windows%\LastGood
  • %Windows%\LastGood\INF
  • %Program Files%\FREERA~1\tmp
  • %Program Files%\FREERA~1\tmp\a.{971C5380-92A0-5A69-B3EE-C3002B33309E}

Step 7

Scan your computer with your Trend Micro product to delete files detected as TROJ_AGKT.SMUS5. 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 8

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 Profile%\Application Data\2.tmp
  • %System Root%\359679~1.AQQ
  • %System Root%\AFC9FE~1.BAT
  • %User Temp%\inl3.tmp
  • %User Temp%\setup_kankan.exe
  • %User Temp%\360moheInstall.exe
  • %Windows%\fonts\msgothic.ttf
  • %Windows%\fonts\msuigoth.ttf
  • %Windows%\fonts\MSMINCHO.TTF
  • %Windows%\fonts\Gulim.ttf
  • %Windows%\fonts\Gulimche.ttf
  • %Windows%\fonts\Dotum.ttf
  • %Windows%\fonts\Batang.ttf
  • %Windows%\fonts\Gungsuh.ttf
  • %Windows%\fonts\Simsun.ttf
  • %Windows%\fonts\nsimsun.ttf
  • %Windows%\fonts\MingLiU.ttf
  • %Windows%\fonts\pmingliu.ttf
  • %Windows%\INF\oem12.inf


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