Analysis by: Mar Philip Elaurza
ALIASES:

Ransom:Win32/Exxroute (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 is capable of encrypting files in the affected system.

  TECHNICAL DETAILS

File Size: 343,040 bytes
File Type: DLL
Memory Resident: Yes
Initial Samples Received Date: 24 May 2016

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 files:

  • {malware path}\svchost.exe
  • %User Startup%\{random}.lnk
  • %User Startup%\{random}.bmp
  • %User Startup%\{random}.html
  • %All Users Profile%\Application Data\{random}.key
  • {folders containing encrypted files}\!Recovery_{random}.html
  • {folders containing encrypted files}\!Recovery_{random}.bmp
  • {folders containing encrypted files}\!Recovery_{random}.txt
  • %Start Menu%\!Recovery_{random}.html
  • %Start Menu%\!Recovery_{random}.bmp
  • %Start Menu%\!Recovery_{random}.txt

(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.. %All Users Profile% is the All Users folder, where it usually is C:\Documents and Settings\All Users on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\ProgramData 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.. %Start Menu% is the Start Menu folder, where it usually is C:\Documents and Settings\{user name}\Start Menu on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Roaming\Microsoft\Windows\Start Menu 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.)

Other Details

This Trojan renames encrypted files using the following names:

  • {original filename.file extension}.crypt

It is capable of encrypting files in the affected system.

NOTES:

  SOLUTION

Minimum Scan Engine: 9.800
FIRST VSAPI PATTERN FILE: 12.546.06
FIRST VSAPI PATTERN DATE: 24 May 2016
VSAPI OPR PATTERN File: 12.547.00
VSAPI OPR PATTERN Date: 25 May 2016

NOTES:

Trend customers:

    Keep your pattern and scan engine files updated. Trend Micro antivirus software can clean or remove most types of computer threats. Malware, though, such as Trojans, scripts, overwriting viruses and joke programs which are identified as uncleanable, should simply be deleted.

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  • Use HouseCall - the Trend Micro online threat scanner to check for malware that may already be on your PC.
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