TROJ_DROPPR.NVG
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)
Windows
![](/vinfo/imgFiles/legend.jpg)
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
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
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
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
- %User Profile%\Guard\1
Step 4
Search and delete these 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
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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