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Trojan.Win32.FAKEFOLDR.AMM

December 16, 2019
 Analysis by: Carl Maverick Pascual
 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


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 does not have any propagation routine.

It does not have any backdoor routine.

It does not have any information-stealing capability.

  TECHNICAL DETAILS

File Size:

95,967 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

13 Dec 2019

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:

  • %ProgramData%\V29ybQ.jpg -> Detected as Worm.VBS.RUNNER.A
  • %ProgramData%\f16e678e0faed084c70405f14d47bc38\37a6259cc0c1dae299a7866489dff0bd.HTML -> Component html file
  • %ProgramData%\f16e678e0faed084c70405f14d47bc38\321c3cf486ed509164edec1e1981fec8.js -> Detected as TrojanSpy.JS.FAKECHRO.A
  • %ProgramData%\f16e678e0faed084c70405f14d47bc38\baec6461b0d69dde1b861aefbe375d8a.png -> Component image file
  • %ProgramData%\f16e678e0faed084c70405f14d47bc38\manifest.json -> Loads TrojanSpy.JS.FAKECHRO.A
  • %ProgramData%\Y2hyb21l.jpg -> Detected as TrojanSpy.Win32.FAKECHRO.A

(Note: %ProgramData% is a version of the Program Files folder where any user on a multi-user computer can make changes to programs. This contains application data for all users. This is usually C:\ProgramData on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit), or C:\Documents and Settings\All Users on Windows Server 2003(32-bit), 2000(32-bit), XP.)

It adds the following processes:

  • %System%\attrib.exe +s +h %ProgramData%\Y2hyb21l.jpg
  • %System%\attrib.exe +s +h %ProgramData%\Wallpaper.jpg
  • wscript.exe /e:vbscript.encode C:\ProgramData\V29vbQ.jpg pyld
  • explorer.exe /e, {current directory}

(Note: %ProgramData% is a version of the Program Files folder where any user on a multi-user computer can make changes to programs. This contains application data for all users. This is usually C:\ProgramData on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit), or C:\Documents and Settings\All Users on Windows Server 2003(32-bit), 2000(32-bit), XP.)

It creates the following folders:

  • %ProgramData%\f16e678e0faed084c70405f14d47bc38

(Note: %ProgramData% is a version of the Program Files folder where any user on a multi-user computer can make changes to programs. This contains application data for all users. This is usually C:\ProgramData on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit), or C:\Documents and Settings\All Users on Windows Server 2003(32-bit), 2000(32-bit), XP.)

Propagation

This Trojan does not have any propagation routine.

Backdoor Routine

This Trojan does not have any backdoor routine.

Information Theft

This Trojan does not have any information-stealing capability.

Other Details

This Trojan does not exploit any vulnerability.

  SOLUTION

Minimum Scan Engine:

9.850

FIRST VSAPI PATTERN FILE:

15.556.04

FIRST VSAPI PATTERN DATE:

13 Dec 2019

VSAPI OPR PATTERN File:

15.557.00

VSAPI OPR PATTERN Date:

14 Dec 2019

Step 1

Before doing any scans, Windows 7, Windows 8, Windows 8.1, and Windows 10 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 Trojan.Win32.FAKEFOLDR.AMM

[ 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

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.
  • %ProgramData%\f16e678e0faed084c70405f14d47bc38

Step 5

Scan your computer with your Trend Micro product to delete files detected as Trojan.Win32.FAKEFOLDR.AMM. 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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