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TSPY_EMOTET.KH

May 15, 2017
 Analysis by: Johnlery Triunfante
 ALIASES:

Trojan:Win32/Emotet.K (Microsoft); Trojan-Banker.Win32.Emotet.vmy (KASPERSKY)

 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 as an attachment to email messages spammed by other malware/grayware or malicious users. It arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

However, as of this writing, the said sites are inaccessible. It deletes itself after execution.

  TECHNICAL DETAILS

File Size:

220,672 bytes

File Type:

EXE

Initial Samples Received Date:

12 May 2017

Arrival Details

This Trojan Spy arrives as an attachment to email messages spammed by other malware/grayware or malicious users.

It 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 copies of itself into the affected system and executes them:

  • %AppDataLocal%\{random}\{random}.exe

(Note: %AppDataLocal% is the Application Data folder found in Local Settings, where it is usually C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local 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.)

It creates the following folders:

  • %AppDataLocal%\{random}

(Note: %AppDataLocal% is the Application Data folder found in Local Settings, where it is usually C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local 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 Spy drops the following file(s) in the Windows User Startup folder to enable its automatic execution at every system startup:

  • %User Startup%\{random}.lnk -> targets the dropped copy of the malware

(Note: %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.)

Other Details

This Trojan Spy connects to the following possibly malicious URL:

  • http://{BLOCKED}.{BLOCKED}.142.107:443/
  • http://{BLOCKED}.{BLOCKED}.18.170:443/
  • http://{BLOCKED}.{BLOCKED}.78.94:443/
  • http://{BLOCKED}.{BLOCKED}.24.211:443/
  • http://{BLOCKED}.{BLOCKED}.186.178:8080/
  • http://{BLOCKED}.{BLOCKED}.77.193:8080/
  • http://{BLOCKED}.{BLOCKED}.145.252:8080/
  • http://{BLOCKED}.{BLOCKED}.172.45:8080/
  • http://{BLOCKED}.{BLOCKED}.83.86:8080/
  • http://{BLOCKED}.{BLOCKED}.231.207:8080/
  • http://{BLOCKED}.{BLOCKED}.215.16:8080/
  • http://{BLOCKED}.{BLOCKED}.36.193:8080/
  • http://{BLOCKED}.{BLOCKED}.124.163:8080/
  • http://{BLOCKED}.{BLOCKED}.54.93:8080/

However, as of this writing, the said sites are inaccessible.

It deletes itself after execution.