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RANSOM_BANKTEAR.A

November 02, 2016
 Analysis by: John Kevin Sanchez
 ALIASES:

Trojan:Win32/Dynamer!ac (Microsoft), Ransomware-FTD!38E1F6B7BF01 (McAfee), Trojan-Ransom.Win32.Crypren.acyc (Kaspersky)

 PLATFORM:

Windows

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Downloaded from the Internet, Dropped by other malware


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 connects to certain websites to send and receive information. However, as of this writing, the said sites are inaccessible. It is capable of encrypting files in the affected system.

  TECHNICAL DETAILS

File Size:

4,498,432 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

05 Aug 2016

Payload:

Encrypts files, Connects to URLs/IPs

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:

  • %User Profile%\Documents\WindowsUpdate.locked - contains the password and a ransomnote

(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 Details

This Trojan connects to the following website to send and receive information:

  • http://{BLOCKED}.{BLOCKED}.182.35/Ransom/ransom.php?DGCMP={machine name}&DGMAC={MAC address}&DGPASS={password}

It renames encrypted files using the following names:

  • {original filename}.locked

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

It is capable of encrypting files in the affected system.

NOTES:

This ransomware encrypts all files.

This ransomware displays the following:

  SOLUTION

Minimum Scan Engine:

9.800

FIRST VSAPI PATTERN FILE:

12.696.01

FIRST VSAPI PATTERN DATE:

05 Aug 2016

VSAPI OPR PATTERN File:

12.697.00

VSAPI OPR PATTERN Date:

06 Aug 2016

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

Search and delete these files

[ 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%\Documents\WindowsUpdate.locked

Step 5

Restart in normal mode and scan your computer with your Trend Micro product for files detected as RANSOM_BANKTEAR.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.

Step 6

Restore encrypted files from backup.


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