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BKDR_BERBEW.G

June 18, 2013
 ALIASES:

Backdoor:Win32/Berbew.G (Microsoft); BackDoor-AXJ.gen (McAfee); Backdoor.Berbew.G (Symantec); Trojan-Proxy.Win32.Qukart.gen (Kaspersky); BehavesLike.Win32.Malware.ssc (mx-v) (Sunbelt); Could be a Trojan horse BackDoor.Padodor.gen (AVG)

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW


This backdoor 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:

46,080 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

07 May 2013

Arrival Details

This backdoor 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 backdoor drops the following copies of itself into the affected system:

  • %System%\Ffgdnc32.exe

(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.)

Other System Modifications

This backdoor adds the following registry keys:

HKEY_CLASSES_ROOT\CLSID\{79FEACFF-FFCE-815E-A900-316290B5B738}\
InProcServer32

HKEY_USERS\.DEFAULT\SOFTWARE\
Microsoft\Windows\CurrentVersion\
Explorer\BrowseNewProcess

It adds the following registry entries:

HKEY_CURRENT_USER\Software\Microsoft
QueenKarton = "c"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{79FEACFF-FFCE-815E-A900-316290B5B738}\InProcServer32
ThreadingModel = "Apartment"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\ShellServiceObjectDelayLoad
Web Event Logger = "{79FEACFF-FFCE-815E-A900-316290B5B738}"

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

It modifies the following registry entries:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Internet Settings\
Zones\0
1601 = "0"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Internet Settings\
Zones\1
1601 = "0"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Internet Settings\
Zones\2
1601 = "0"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Internet Settings\
Zones\3
1601 = "0"

(Note: The default value data of the said registry entry is 1.)

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Internet Settings\
Zones\4
1601 = "0"

(Note: The default value data of the said registry entry is 1.)

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
BrowseNewProcess
BrowseNewProcess = "yes"

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

Dropping Routine

This backdoor drops the following files:

  • %System%\Ffgdnc32.exe
  • %System%\Ghoiemjd.dll
  • %User Temp%\kgdonkfa.htm
  • %User Temp%\hnpnimif.htm
  • %User Temp%\cmgfiofj.htm
  • %User Temp%\llpiaema.htm
  • %User Temp%\epgagaam.htm
  • %User Temp%\ngnfiidl.htm
  • %User Temp%\ghinijfa.htm
  • %User Temp%\pgpdkqpk.htm
  • %User Temp%\hidcdepk.htm
  • %User Temp%\bpckmljp.htm
  • %User Temp%\khdbnghg.htm
  • %User Temp%\egidalfa.htm
  • %User Temp%\nhemalhf.htm
  • %User Temp%\gjllenoa.htm
  • %User Temp%\pkhedoaf.htm
  • %User Temp%\ikaddmol.htm
  • %User Temp%\bengkijh.htm
  • %User Temp%\kpkobaif.htm
  • %User Temp%\eidhlcgd.htm

(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.. %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.)

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

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\{79FEACFF-FFCE-815E-A900-316290B5B738}
    • InProcServer32
  • In HKEY_USERS\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer
    • BrowseNewProcess

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
    • QueenKarton = "c"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{79FEACFF-FFCE-815E-A900-316290B5B738}\InProcServer32
    • ThreadingModel = "Apartment"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\ShellServiceObjectDelayLoad
    • Web Event Logger = "{79FEACFF-FFCE-815E-A900-316290B5B738}"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings
    • GlobalUserOffline = "0"

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\Windows\CurrentVersion\Internet Settings\Zones\0
    • 1601 = "0"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\1
    • 1601 = "0"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\2
    • 1601 = "0"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\3
    • From: 1601 = "0"
      To: 1601 = ""1""
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\4
    • From: 1601 = "0"
      To: 1601 = ""1""
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\BrowseNewProcess
    • From: BrowseNewProcess = "yes"
      To: BrowseNewProcess = ""yes""

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%\Ffgdnc32.exe
  • %System%\Ghoiemjd.dll
  • %User Temp%\kgdonkfa.htm
  • %User Temp%\hnpnimif.htm
  • %User Temp%\cmgfiofj.htm
  • %User Temp%\llpiaema.htm
  • %User Temp%\epgagaam.htm
  • %User Temp%\ngnfiidl.htm
  • %User Temp%\ghinijfa.htm
  • %User Temp%\pgpdkqpk.htm
  • %User Temp%\hidcdepk.htm
  • %User Temp%\bpckmljp.htm
  • %User Temp%\khdbnghg.htm
  • %User Temp%\egidalfa.htm
  • %User Temp%\nhemalhf.htm
  • %User Temp%\gjllenoa.htm
  • %User Temp%\pkhedoaf.htm
  • %User Temp%\ikaddmol.htm
  • %User Temp%\bengkijh.htm
  • %User Temp%\kpkobaif.htm
  • %User Temp%\eidhlcgd.htm

Step 6

Scan your computer with your Trend Micro product to delete files detected as BKDR_BERBEW.G. 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.


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