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TROJ_DLOADER.YMNGG

March 07, 2015
 Modified by: Jaime Benigno Reyes
 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:

64,512 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

26 Feb 2015

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.

Other System Modifications

This Trojan adds the following registry keys:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
SystemCertificates\AuthRoot\Certificates\
2796BAE63F1801E277261BA0D77770028F20EEE4

Other Details

This Trojan connects to the following possibly malicious URL:

  • http://api-content.{BLOCKED}x.com:443
  • http://api.{BLOCKED}x.com:443
  • http://www.download.{BLOCKED}supdate.com/msdownload/update/v3/static/trustedr/en/2796BAE63F1801E277261BA0D77770028F20EEE4.crt
  • http://www.download.{BLOCKED}supdate.com/msdownload/update/v3/static/trustedr/en/authrootseq.txt
  • http://www.download.{BLOCKED}supdate.com/msdownload/update/v3/static/trustedr/en/authrootstl.cab

  SOLUTION

Minimum Scan Engine:

9.750

FIRST VSAPI PATTERN FILE:

11.504.04

FIRST VSAPI PATTERN DATE:

27 Feb 2015

VSAPI OPR PATTERN File:

11.505.00

VSAPI OPR PATTERN Date:

28 Feb 2015

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

Delete this registry key

[ 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_LOCAL_MACHINE\SOFTWARE\Microsoft\SystemCertificates\AuthRoot\Certificates
    • 2796BAE63F1801E277261BA0D77770028F20EEE4

Step 4

Scan your computer with your Trend Micro product to delete files detected as TROJ_DLOADER.YMNGG. 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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