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Threat Encyclopedia

TROJ_FAKEAV.EHM


ALIASES:

Rogue:Win32/Winwebsec (Microsoft); Generic BackDoor.abd (McAfee); Adware.CWSIEFeats (Symantec); Trojan-Ransom.Win32.Gimemo.aoel (Kaspersky); Lookslike.Win32.Cbeplay.p (v) (Sunbelt); Trojan horse Generic29.ANPS (AVG)

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:

611,328 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

07 May 2013

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:

  • %Application Data%\bee8695a139c2cb.exe

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

It creates the following folders:

  • %Start Menu%\Programs\New Folder (567)
  • %Desktop%\New Folder (552)
  • %Start Menu%\Programs\Win 8 Security System

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

Autostart Technique

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

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
bee8695a139c2cb.exe = "%Application Data%\bee8695a139c2cb.exe"

Other System Modifications

This Trojan modifies the following file(s):

  • %Application Data%\GDIPFONTCACHEV1.DAT

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

It deletes the following files:

  • %Application Data%\bee8695a139c2cb.exe:Zone.Identifier
  • %Start Menu%\Programs\Win 8 Security System\Uninstall Win 8 Security System.lnk
  • %Desktop%\Win 8 Security System.lnk
  • %Desktop%\Win 8 Security System Order Information Page.lnk
  • %User Temp%\ae3840d3.tmp

(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming on Windows Vista and 7.. %Start Menu% is the current user's Start Menu folder, which is usually C:\Windows\Start Menu or C:\Documents and Settings\{User name}\Start Menu on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming\Microsoft\Windows\Start Menu on Windows Vista and 7.. %Desktop% is the current user's desktop, which is usually C:\Documents and Settings\{User Name}\Desktop on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\Desktop 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.)

It adds the following registry entries:

HKEY_CURRENT_USER\Software\Microsoft\
Windows NT
BuildVersion = "0"

HKEY_CURRENT_USER\Software\Microsoft\
Windows NT
BuildNumber = "0"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Internet Settings
GlobalUserOffline = "0"

HKEY_CURRENT_USER\Software\Microsoft\
Windows NT
FrameworkDetails = "1"

It modifies the following registry entries:

HKEY_CURRENT_USER\Software\Microsoft\
GDIPlus
FontCachePath = "%Application Data%"

(Note: The default value data of the said registry entry is %User Profile%\Local Settings\Application Data.)

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
DirectDraw\MostRecentApplication
Name = "bee8695a139c2cb.exe"

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

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
DirectDraw\MostRecentApplication
ID = "5425311"

(Note: The default value data of the said registry entry is 41107b81.)

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Direct3D\MostRecentApplication
Name = "bee8695a139c2cb.exe"

(Note: The default value data of the said registry entry is vfp6.exe.)

Dropping Routine

This Trojan drops the following files:

  • %System%\drivers\9f0e.sys
  • %Start Menu%\Programs\Win 8 Security System\Launch Win 8 Security System.lnk
  • %Start Menu%\Programs\Win 8 Security System\Buy Win 8 Security System.lnk
  • %Desktop%\Buy Win 8 Security System.lnk
  • %User Temp%\VGX21.tmp
  • %User Temp%\VGX25.tmp
  • %User Temp%\VGX29.tmp
  • %User Temp%\VGX2D.tmp
  • %User Temp%\VGX31.tmp
  • %User Temp%\VGX35.tmp
  • %User Temp%\VGX39.tmp
  • %User Temp%\VGX3D.tmp

(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.. %Start Menu% is the current user's Start Menu folder, which is usually C:\Windows\Start Menu or C:\Documents and Settings\{User name}\Start Menu on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming\Microsoft\Windows\Start Menu on Windows Vista and 7.. %Desktop% is the current user's desktop, which is usually C:\Documents and Settings\{User Name}\Desktop on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\Desktop 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 Details

This Trojan connects to the following possibly malicious URL:

  • http://{BLOCKED}t.com/z.php?ver=9

This report is generated via an automated analysis system.

SOLUTION

Minimum Scan Engine:

9.300

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

Restart in Safe Mode

[ Learn More ]

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\Windows\CurrentVersion\Run
    • bee8695a139c2cb.exe = "%Application Data%\bee8695a139c2cb.exe"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows NT
    • BuildVersion = "0"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows NT
    • BuildNumber = "0"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings
    • GlobalUserOffline = "0"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows NT
    • FrameworkDetails = "1"

Step 4

Restore these modified registry values

[ Learn More ]

Important:Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this only if you know how to or you can seek your system administrator's help. You may also check out this Microsoft article first before modifying your computer's registry.


  • In HKEY_CURRENT_USER\Software\Microsoft\GDIPlus
    • From: FontCachePath = "%Application Data%"
      To: FontCachePath = ""%User Profile%\Local Settings\Application Data""
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\DirectDraw\MostRecentApplication
    • From: Name = "bee8695a139c2cb.exe"
      To: Name = ""iexplore.exe""
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\DirectDraw\MostRecentApplication
    • From: ID = "5425311"
      To: ID = ""41107b81""
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Direct3D\MostRecentApplication
    • From: Name = "bee8695a139c2cb.exe"
      To: Name = ""vfp6.exe""

Step 5

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.
  • %System%\drivers\9f0e.sys
  • %Start Menu%\Programs\Win 8 Security System\Launch Win 8 Security System.lnk
  • %Start Menu%\Programs\Win 8 Security System\Buy Win 8 Security System.lnk
  • %Desktop%\Buy Win 8 Security System.lnk
  • %User Temp%\VGX21.tmp
  • %User Temp%\VGX25.tmp
  • %User Temp%\VGX29.tmp
  • %User Temp%\VGX2D.tmp
  • %User Temp%\VGX31.tmp
  • %User Temp%\VGX35.tmp
  • %User Temp%\VGX39.tmp
  • %User Temp%\VGX3D.tmp

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.
  • %Start Menu%\Programs\New Folder (567)
  • %Desktop%\New Folder (552)
  • %Start Menu%\Programs\Win 8 Security System

Step 7

Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_FAKEAV.EHM. 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 deleted/modified files and/or registry entries from backup

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

    • %Application Data%\GDIPFONTCACHEV1.DAT

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.

  • %Application Data%\bee8695a139c2cb.exe:Zone.Identifier
  • %Start Menu%\Programs\Win 8 Security System\Uninstall Win 8 Security System.lnk
  • %Desktop%\Win 8 Security System.lnk
  • %Desktop%\Win 8 Security System Order Information Page.lnk
  • %User Temp%\ae3840d3.tmp


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