Analysis by: Rheniel Rhay Ramos
ALIASES:

TR/AD.ClipBanker.wujvp (Avira); Trojan.MSIL.Agent.DIC (Bitdefender); Trojan.MSIL.Agent.adrvz (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: 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 creates folders where it drops its files.

It deletes the initially executed copy of itself.

  TECHNICAL DETAILS

File Size: 9,728 bytes
File Type: EXE
Memory Resident: No
Initial Samples Received Date: 25 May 2016
Payload: Drops files

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%\Dibifu_8\go.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
ScdBcd = "%Application Data%\Dibifu_8\go.exe"

Other Details

This Trojan does the following:

  • It replaces any copied Bitcoin wallet address in the clipboard with the following hardcoded address:
    • {BLOCKED}dp2CV3QV5nUEsqSg1ygegLmqRygj
  • It uses the Regular Expression [13][a-km-zA-HJ-NP-Z1-9]{25,34} to validate the copied Bitcoin address wherein:
    • The first character should be 1 or 3
    • The second up to the last character should be a letter or number except for l, I, O, or 0
    • The address should contain 26 to 35 characters

It deletes the initially executed copy of itself

  SOLUTION

Minimum Scan Engine: 9.850
FIRST VSAPI PATTERN FILE: 14.142.08
FIRST VSAPI PATTERN DATE: 21 Mar 2018
VSAPI OPR PATTERN File: 14.143.00
VSAPI OPR PATTERN Date: 22 Mar 2018

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

Identify and terminate files detected as TROJ_BTCCLIP.A

[ Learn More ]
  1. Windows Task Manager may not display all running processes. In this case, please use a third-party process viewer, preferably Process Explorer, to terminate the malware/grayware/spyware file. You may download the said tool here.
  2. If the detected file is displayed in either Windows Task Manager or Process Explorer but you cannot delete it, restart your computer in safe mode. To do this, refer to this link for the complete steps.
  3. If the detected file is not displayed in either Windows Task Manager or Process Explorer, continue doing the next steps.

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\Microsoft\Windows\CurrentVersion\Run
    • ScdBcd = "%Application Data%\Dibifu_8\go.exe"

Step 5

Search and delete this folder

[ Learn More ]
Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden folders in the search result.
  • %Application Data%\Dibifu_8

Step 6

Scan your computer with your Trend Micro product to delete files detected as TROJ_BTCCLIP.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 the following Trend Micro Support pages for more information:


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