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TROJ_CRYPT.YYSJU

March 17, 2017
 Analysis by: Joselyn Canuela
 ALIASES:

Trojan-PSW.Win32.Fareit.cmuh (Kaspersky), Trojan:Win32/Skeeyah.A!rfn (Microsoft), Downloader.Generic14.BMKW (AVG)

 PLATFORM:

Windows

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW


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.

  TECHNICAL DETAILS

File Size:

153,088 bytes

File Type:

EXE

Initial Samples Received Date:

06 Mar 2017

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 adds the following processes:

  • explorer.exe

  SOLUTION

Minimum Scan Engine:

9.850

FIRST VSAPI PATTERN FILE:

13.266.06

FIRST VSAPI PATTERN DATE:

09 Mar 2017

VSAPI OPR PATTERN File:

13.267.00

VSAPI OPR PATTERN Date:

10 Mar 2017

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 normal mode and scan your computer with your Trend Micro product for files detected as TROJ_CRYPT.YYSJU. 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.


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