Analysis by: Johnlery Triunfante
ALIASES:

Trojan-Dropper.RAR.Agent.aq (Kaspersky); Trojan:BAT/Rescon.A!bit (Microsoft)

 PLATFORM:

Windows

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

  • Threat Type: Trojan Spy

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This Trojan Spy 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: 840,993 bytes
File Type: EXE
Initial Samples Received Date: 03 Apr 2017

Arrival Details

This Trojan Spy 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 Spy drops the following files:

  • %Application Data%\gjDeqV
  • %Application Data%\qw7vw\__tmp_rar_sfx_access_check_{random numbers}
  • %Application Data%\qw7vw\i4se5.exe
  • %Application Data%\qw7vw\x
  • %ProgramData%\{computer name}_{date}.png
  • %User Profile%\qw7vw\__tmp_rar_sfx_access_check_{random numbers}
  • %User Profile%\qw7vw\file.exe
  • %User Profile%\qw7vw\oz5l2.vbs
  • %User Startup%\gjDeqV.vbs
  • %System Root%\gjDeqVgjDeqV
  • %System Root%\gjDeqVgjDeqV\gjDeqV.exe
  • %System Root%\gjDeqVgjDeqV\gjDeqV.vbs
  • %System Root%\gjDeqVgjDeqV\x

(Note: %Application Data% is the Application Data folder, where it usually is C:\Documents and Settings\{user name}\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Roaming on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.. %ProgramData% is the Program Data folder, where it usually is C:\Program Files in Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\ProgramData in Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.. %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.. %User Startup% is the current user's Startup folder, which is usually C:\Documents and Settings\{user}\Start Menu\Programs\Startup on Windows 2000 and XP, and C:\Documents and Settings\{User name}\Start Menu\Programs\Startup on Windows Vista, 7, and 8.. %System Root% is the Windows root folder, where it usually is C:\ on all Windows operating system versions.)

Autostart Technique

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

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
{random hex value} = %ProgramData%\Important.exe

Dropping Routine

This Trojan Spy drops the following files:

  • %ProgramData%\Browsers.txt
  • %ProgramData%\Important.exe
  • %ProgramData%\Mails.txt
  • %ProgramData%\newloki1.exe

(Note: %ProgramData% is the Program Data folder, where it usually is C:\Program Files in Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\ProgramData in Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)

Other Details

This Trojan Spy connects to the following possibly malicious URL:

  • http://www.{BLOCKED}l.us/key1/html/post.php?type=notification&machinename={computer name}&machinetime={time}
  • http://www.{BLOCKED}l.us/key1/html/image/upload.php
  • http://www.{BLOCKED}l.us/key1/html/post.php?type=keystrokes&machinename={computer name}&windowtitle={window title}&keystrokestyped={value}&machinetime={time}