Analysis by: Jennifer Gumban
 PLATFORM:

Windows

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

This Trojan may arrive bundled with malware packages as a malware component.

It steals certain information from the system and/or the user.

However, as of this writing, the said sites are inaccessible.

  TECHNICAL DETAILS

Tamaño del archivo 136,704 bytes
Tipo de archivo DLL
Residente en memoria Yes
Fecha de recepción de las muestras iniciales 28 Jan 2016
Carga útil Connects to URLs/IPs, Steals information, Downloads files

Arrival Details

This Trojan may arrive bundled with malware packages as a malware component.

Autostart Technique

This Trojan is a .DLL file that adds the following services:

  • Service Name: Dncp
  • Display Name: Dncp Client
  • Binary Path: %SystemRoot%\System32\svchost.exe -k netsvcs
  • Startup Type: SERVICE_AUTO_START
  • Account: LocalSystem

It is a .DLL file that adds the following services:

HKLM\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\SvcHost\
netsvcs
Dncp = ""

HKLM\SYSTEM\CurrentControlSet\
Services\Dncp\Parameters
ServiceDll = "{malware path}\McAltLib.dll"

Backdoor Routine

This Trojan connects to the following URL(s) to send and receive commands from a remote malicious user:

  • {BLOCKED}anbox.org:22

Information Theft

This Trojan steals the following information:

  • Username
  • Hostname
  • MAC Address
  • IP Address
  • CPU Information
  • IE User Agent

Other Details

Based on analysis of the codes, it has the following capabilities:

  • Steal information
  • Remote Control
  • Download malware

However, as of this writing, the said sites are inaccessible.

NOTES:

It uses the following exports to download further plugins from the remote server:

  • StartWorker
  • StopWorker
  • WorkerRun
  • DllEntryPoint

  SOLUTION

Motor de exploración mínimo 9.800
Primer archivo de patrones de VSAPI 12.302.06
Primera fecha de publicación de patrones de VSAPI 28 Jan 2016
Versión de patrones OPR de VSAPI 12.303.00
Fecha de publicación de patrones OPR de VSAPI 29 Jan 2016

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, and then 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\Windows NT\CurrentVersion\SvcHost\netsvcs
    • Dncp = ""
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Dncp\Parameters
    • ServiceDll = "{malware path}\McAltLib.dll"

Step 4

Disable this malware service

[ Learn More ]
  •  
    • Dncp

Step 5

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