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TROJ_LOADER.NHH

August 27, 2015
 Analysis by: Pearl Charlaine Espejo
 ALIASES:

Trojan:Win32/Skeeyah.A!bit (Microsoft); RDN/Generic PWS.y (McAfee); UDS:DangerousObject.Multi.Generic (Kaspersky); Troj/MSIL-DZM (Sophos)

 PLATFORM:

Windows

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Dropped by other malware


This Trojan arrives as a component bundled with malware/grayware packages. It may be dropped by other malware.

It requires its main component to successfully perform its intended routine. It is used to load and execute a file.

  TECHNICAL DETAILS

File Size:

14,336 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

19 Aug 2015

Arrival Details

This Trojan arrives as a component bundled with malware/grayware packages.

It may be dropped by the following malware:

Other Details

This Trojan requires its main component to successfully perform its intended routine.

It is used to load and execute the following file:

  • %Application Data%\Microsoft\Windows\dslsvc.exe - detected as TSPY_GOLROTED.YZAT

(Note: %Application Data% is the Application Data folder, where it usually is C:\Documents and Settings\{user name}\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Roaming on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)

NOTES:

It monitors the dslsvc.exe process. If the said process is terminated, it immediately loads and executes it.

  SOLUTION

Minimum Scan Engine:

9.750

FIRST VSAPI PATTERN FILE:

11.866.01

FIRST VSAPI PATTERN DATE:

19 Aug 2015

VSAPI OPR PATTERN File:

11.867.00

VSAPI OPR PATTERN Date:

20 Aug 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

Restart in Safe Mode

[ Learn More ]

Step 4

Remove malware/grayware files that dropped/downloaded TROJ_LOADER.NHH. (Note: Please skip this step if the threats listed below have already been removed.)

    • TSPY_GOLROTED.YZAT

Step 5

Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_LOADER.NHH. 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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