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TROJ_DROPPR.NVG

April 05, 2017
 ALIASES:

TrojanSpy:Win32/Skeeyah.A!rfn (Microsoft); Generic Trojan.o (McAfee); Trojan.Gen (Symantec); Trojan-Spy.MSIL.Omaneat.ciy (Kaspersky); Trojan.Win32.Generic!BT (Sunbelt); Trojan horse MSIL11.AIMZ (AVG)

 PLATFORM:

Windows

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

  • 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:

1,647,616 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

05 Apr 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 creates the following folders:

  • %User Profile%\Application Data\Monitor
  • %Program Files%\Client
  • %User Profile%\Monitor\Logs
  • %User Profile%\Monitor\Files
  • %User Profile%\Monitor\Guard
  • %User Profile%\Monitor\Screenshots

(Note: %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.. %Program Files% is the Program Files folder, where it usually is C:\Program Files on all Windows operating system versions; C:\Program Files (x86) for 32-bit applications running on Windows 64-bit operating systems.)

Other System Modifications

This Trojan deletes the following files:

  • {malware path and file name}:zone.identifier

It adds the following registry entries:

HKEY_CURRENT_USER\Software
DHlsDotLtsqCWGirASaPaw== = "qoiFRCdObQZUZVAJGudbWo7IgBGSWTrd1ygIwVeMy34="

HKEY_CURRENT_USER\Software
jkgnSznwKAfieDbL6hHZGw== = "WrMUjoGfpL6sHAnS6tnc3A=="

Dropping Routine

This Trojan drops the following files:

  • %User Profile%\Guard\1

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

Other Details

This Trojan connects to the following possibly malicious URL:

  • {BLOCKED}0
  • {BLOCKED}0.1

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine:

9.8

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

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
    • DHlsDotLtsqCWGirASaPaw== = "qoiFRCdObQZUZVAJGudbWo7IgBGSWTrd1ygIwVeMy34="
  • In HKEY_CURRENT_USER\Software
    • jkgnSznwKAfieDbL6hHZGw== = "WrMUjoGfpL6sHAnS6tnc3A=="

Step 3

Search and delete this file

[ Learn More ]
There may be some files that are hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the "More advanced options" option to include all hidden files and folders in the search result.
  • %User Profile%\Guard\1

Step 4

Search and delete these folders

[ 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.
  • %User Profile%\Application Data\Monitor
  • %Program Files%\Client
  • %User Profile%\Monitor\Logs
  • %User Profile%\Monitor\Files
  • %User Profile%\Monitor\Guard
  • %User Profile%\Monitor\Screenshots

Step 5

Scan your computer with your Trend Micro product to delete files detected as TROJ_DROPPR.NVG. 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.

Step 6

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.

  • {malware path and file name}:zone.identifier


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