TROJ_EMOTET.WJTR

March 03, 2015
 Analysis by: David John Agni
 ALIASES:

Trojan:Win32/Emotet.C (Microsoft)

 PLATFORM:

Windows

 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.

It deletes itself after execution.

  TECHNICAL DETAILS

File Size:

285,184 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

12 Feb 2015

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 copies of itself into the affected system and executes them:

  • %Application Data%\Identities\{Random Filename}.exe

(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.)

Autostart Technique

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

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
{Random Filename}.exe = "%Application Data%\Identities\{Random Filename}.exe"

Other System Modifications

This Trojan adds the following registry keys as part of its installation routine:

HKEY_CURRENT_USER\Software\Netscape\
5.0
{Random String} =

Other Details

This Trojan connects to the following possibly malicious URL:

  • http://{BLOCKED}gwxfuvoawd.eu/{Random String}/8580748f/
  • http://{BLOCKED}icaekgvdsc.eu/{Random String}/8580748f/
  • http://{BLOCKED}wghsceshpyc.eu/{Random String}/8580748f/
  • http://{BLOCKED}tobguhrvse.eu/{Random String}/8580748f/
  • http://{BLOCKED}ttwdrgfydlr.eu/{Random String}/8580748f/
  • http://{BLOCKED}tbgrwxalqlu.eu/{Random String}/8580748f/
  • http://{BLOCKED}trkypraqhto.eu/{Random String}/8580748f/
  • http://{BLOCKED}tbotiwxfxqu.eu/{Random String}/8580748f/

It deletes itself after execution.