BKDR_ANDROM.NG

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.

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:

• %Program Files%\Common Files\Microsoft Webupdater.{2227A280-3AEA-1069-A2DE-08002B30309D}\bfvjkphyr.exe

(Note: %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000, Server 2003, and XP (32-bit), Vista (32-bit), and 7 (32-bit), or C:\Program Files (x86) in Windows XP (64-bit), Vista (64-bit), and 7 (64-bit).)

It creates the following folders:

• %System Root%\DOCUME~1
• %System Root%\DOCUME~1\Wilbert
• %User Profile%\LOCALS~1
• %User Profile%\Application Data\{FE6D023A-33D7-4E36-8578-1C97DBC49D94}
• %Program Files%\Common Files\Microsoft Webupdater.{2227A280-3AEA-1069-A2DE-08002B30309D}

(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:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.. %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000, Server 2003, and XP (32-bit), Vista (32-bit), and 7 (32-bit), or C:\Program Files (x86) in Windows XP (64-bit), Vista (64-bit), and 7 (64-bit).)

Other System Modifications

This backdoor modifies the following file(s):

• %User Profile%\Application Data\Microsoft

(Note: %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 deletes the following files:

• %User Temp%\nsy1.tmp
• %Program Files%\Common Files\Microsoft Webupdater.{2227A280-3AEA-1069-A2DE-08002B30309D}\bfvjkphyr.exe:Zone.Identifier
• %User Temp%\nst13.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, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.. %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000, Server 2003, and XP (32-bit), Vista (32-bit), and 7 (32-bit), or C:\Program Files (x86) in Windows XP (64-bit), Vista (64-bit), and 7 (64-bit).)

It adds the following registry keys:

HKEY_CURRENT_USER\Software\Win7zip

HKEY_CURRENT_USER\Software\Classes\
CLSID\{10A43487-AFC3-C248-BE7D-D23035E2713C}\1FE004EA\
CG1

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
bfvjkphyr.exe

HKEY_LOCAL_MACHINE\Software\Win7zip

HKEY_CURRENT_USER\Software\Classes\
CLSID\{10A43487-AFC3-C248-BE7D-D23035E2713C}\1FE004EA\
CS1

HKEY_CURRENT_USER\Software\Classes\
CLSID\{10A43487-AFC3-C248-BE7D-D23035E2713C}\1FE004EA\
CW1

It adds the following registry entries:

HKEY_CURRENT_USER\Software\Win7zip
Uuid = "{random values}"

HKEY_LOCAL_MACHINE\SOFTWARE\Win7zip
Uuid = "{random values}"

It deletes the following registry keys:

HKEY_CURRENT_USER\CLSID\{10A43487-AFC3-C248-BE7D-D23035E2713C}\
1FE004EA\CW1

Dropping Routine

This backdoor drops the following files:

• %User Temp%\Naxunenige.diq
• %User Temp%\Zeceqocanu.dll
• %User Temp%\Gediwihatabo.exe
• %User Temp%\zahufiwapoh.dll
• %User Temp%\Muyemipezeze.dll
• %User Temp%\nupujulobez.dll
• %User Profile%\Microsoft\Crypto
• %User Profile%\Crypto\RSA
• %User Profile%\RSA\S-1-5-21-1645522239-1292428093-682003330-1003
• %Program Files%\Common Files\Microsoft Webupdater.{2227A280-3AEA-1069-A2DE-08002B30309D}\00016f9d.txt

(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, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.. %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.. %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000, Server 2003, and XP (32-bit), Vista (32-bit), and 7 (32-bit), or C:\Program Files (x86) in Windows XP (64-bit), Vista (64-bit), and 7 (64-bit).)

This report is generated via an automated analysis system.