Analysis by: Alvin John Nieto
ALIASES:

Win32/Injector.BBCT trojan (ESET), Downloader-FYH!D6411771559B (Mcafee)

 PLATFORM:

Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)

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

  • 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: 106,344 bytes
File Type: EXE
Initial Samples Received Date: 04 Apr 2014

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 component file(s):

  • %AppDataLocal%\boutram.dll

(Note: %AppDataLocal% is the Local Application Data folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Local 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\
CurrentVersion\Run
boutram = "rundll32.exe "%AppDataLocal%\boutram.dll",boutram"

It creates the following registry entries to enable automatic execution of dropped component at every system startup:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrenVersion\Winlogon\
Notify\boutram
Impersonate = "1"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrenVersion\Winlogon\
Notify\boutram
Asynchronous = "1"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrenVersion\Winlogon\
Notify\boutram
MaxWait = "1"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrenVersion\Winlogon\
Notify\boutram
voajfkwo = "{values}"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrenVersion\Winlogon\
Notify\boutram
DllName = "%AppDataLocal%\boutram.dll"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrenVersion\Winlogon\
Notify\boutram
Startup = boutram

Other Details

This Trojan connects to the following possibly malicious URL:

  • http://{BLOCKED}a.{BLOCKED}pgrow.co.uk/
  • http://{BLOCKED}1.{BLOCKED}pgrow.co.uk/