Analysis by: Augusto II Remillano
ALIASES:

Gen:Variant.Application.Bundler.Softonic.1 (BitDefender), PUA.Softonic (Norton)

 PLATFORM:

Windows

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

  • Threat Type: Potentially Unwanted Application

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This Potentially Unwanted Application arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites. It may be manually installed by a user.

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

  TECHNICAL DETAILS

File Size: 401,720 bytes
File Type: EXE
Memory Resident: Yes
Initial Samples Received Date: 30 Nov 2018

Arrival Details

This Potentially Unwanted Application arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

It may be manually installed by a user.

Other System Modifications

This Potentially Unwanted Application deletes the following files:

  • %User Temp%\sdjarfile.txt

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista, 7, and 8.)

Other Details

This Potentially Unwanted Application connects to the following possibly malicious URL:

  • http://pdforsell.{BLOCKED}ic.jp/universaldownloader-prefetch

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

  SOLUTION

Minimum Scan Engine: 9.850
SSAPI PATTERN File: 2.127.00
SSAPI PATTERN Date: 29 Nov 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

Scan your computer with your Trend Micro product to delete files detected as PUA.Win32.SoftonicDownloader.AA. 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:

Step 3

Restore this file from backup only Microsoft-related files will be restored. If this malware/grayware also deleted files related to programs that are not from Microsoft, please reinstall those programs on you computer again.  

  • %User Temp%\sdjarfile.txt


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