Analysis by: Alvin John Nieto
ALIASES:

Trojan.Win32.Badur.hbhr (Kaspersky), Win32/TrojanDownloader.Delf.AIC.trojan (ESET)

 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: 248,320 bytes
File Type: EXE
Initial Samples Received Date: 22 Mar 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 file(s)/component(s):

  • %Application Data%\Flash\Launch.bat
  • %Application Data%\Flash\libgmp-3.dll
  • %Application Data%\Flash\msvcp120.dll
  • %Application Data%\Flash\msvcr120.dll
  • %Application Data%\Flash\RapidPrime.exe
  • %User Temp%\CNB_0275.exe
  • %User Temp%\setup.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.. %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 creates the following folders:

  • %Application Data%\Flash

(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.)

Autostart Technique

This Trojan drops the following file(s) in the Windows User Startup folder to enable its automatic execution at every system startup:

  • %User Startup%\flashsec.lnk
  • %User Startup%\flashupdate.lnk

(Note: %User Startup% is the current user's Startup folder, which is usually C:\Windows\Profiles\{user name}\Start Menu\Programs\Startup on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Start Menu\Programs\Startup on Windows NT, and C:\Documents and Settings\{User name}\Start Menu\Programs\Startup.)

Download Routine

This Trojan connects to the following URL(s) to download its component file(s):

  • http://{BLOCKED}.{BLOCKED}.248.85/sgminer.exe
  • http://{BLOCKED}.{BLOCKED}.248.85/firstsg.vbs
  • http://{BLOCKED}.{BLOCKED}.248.85/updatesg.vbs
  • http://{BLOCKED}.{BLOCKED}.248.85/flashsec.exe
  • http://{BLOCKED}.{BLOCKED}.248.85/startsec.vbs
  • http://{BLOCKED}.{BLOCKED}.248.85/updatesec.vbs
  • http://{BLOCKED}.{BLOCKED}.248.85/alien_clicker.exe
  • http://{BLOCKED}.{BLOCKED}.248.85/startcl.vbs
  • http://{BLOCKED}.{BLOCKED}.248.85/updatecl.vbs
  • http://{BLOCKED}.{BLOCKED}.248.85/info.txt
  • http://{BLOCKED}54hhdf.com/report.log

It saves the files it downloads using the following names:

  • %Application Data%\Flash\firstsg.vbs
  • %Application Data%\Flash\flashcl.exe
  • %Application Data%\Flash\flashsec.exe
  • %Application Data%\Flash\info.txt
  • %Application Data%\Flash\sgminer.exe
  • %Application Data%\Flash\startcl.vbs
  • %Application Data%\Flash\startsec.vbs
  • %Application Data%\Flash\updatecl.vbs
  • %Application Data%\Flash\updatesec.vbs
  • %Application Data%\Flash\updatesg.vbs

(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.)