TSPY_KRYPTOVOR.A

April 23, 2015
 Analysis by: Miguel Carlo Ang
 ALIASES:

Win32:Ransom-AVW [Trj](Avast);TR/Dropper.A.37700(Avira);Artemis!00E3B69B18BF(McAfee)

 PLATFORM:

Windows

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

  • Threat Type: Spyware

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This spyware 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:

844,800 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

15 Apr 2015

Arrival Details

This spyware 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 spyware drops the following files:

  • %User Profile%\resume.pdf (normal pdf)
  • %User Profile%\CertMgr.exe (delete afterward)
  • %User Profile%\sert.cer(delete afterward)
  • %User Profile%\Rar.exe (delete afterward)
  • %User Profile%\temporary.rar
  • %User Profile%\AdobeSystem.exe (ransomware component)

(Note: %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.)

Other System Modifications

This spyware adds the following registry entries:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\RunOnce
AdobeUpdate = ""%User Profile%\AdobeSystem.exe""

HKEY_CURRENT_USER\Software\Adobe
Installed = "True"

Other Details

This spyware connects to the following possibly malicious URL:

  • http://{BLOCKED}royal.org/css/salomon.rar
  • http://{BLOCKED}royal.org/loader.php

  SOLUTION

Minimum Scan Engine:

9.750

FIRST VSAPI PATTERN FILE:

11.614.06

FIRST VSAPI PATTERN DATE:

12 Feb 2015

VSAPI OPR PATTERN File:

11.615.00

VSAPI OPR PATTERN Date:

13 Feb 2015

Step 1

Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.

Step 2

Note that not all files, folders, and registry keys and entries are installed on your computer during this malware's/spyware's/grayware's execution. This may be due to incomplete installation or other operating system conditions. If you do not find the same files/folders/registry information, please proceed to the next step.

Step 3

Restart in Safe Mode

[ Learn More ]

Step 4

Delete this registry value

[ Learn More ]

Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.

  • In HKEY_CURRENT_USER\Software\Adobe
    • Installed = "True"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\RunOnce
    • AdobeUpdate = ""%User Profile%\AdobeSystem.exe""

Step 5

Search and delete this file

[ Learn More ]
There may be some files that are hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the "More advanced options" option to include all hidden files and folders in the search result.
  • %User Profile%\resume.pdf
  • %User Profile%\CertMgr.exe
  • %User Profile%\sert.cer
  • %User Profile%\Rar.exe
  • %User Profile%\temporary.rar
  • %User Profile%\AdobeSystem.exe

Step 6

Restart in normal mode and scan your computer with your Trend Micro product for files detected as TSPY_KRYPTOVOR.A. If the detected files have already been cleaned, deleted, or quarantined by your Trend Micro product, no further step is required. You may opt to simply delete the quarantined files. Please check this Knowledge Base page for more information.


Did this description help? Tell us how we did.