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TROJ_DLLHIJACK.C

March 28, 2016
 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

File Size:

136,704 bytes

File Type:

DLL

Memory Resident:

Yes

Initial Samples Received Date:

28 Jan 2016

Payload:

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

Minimum Scan Engine:

9.800

FIRST VSAPI PATTERN FILE:

12.302.06

FIRST VSAPI PATTERN DATE:

28 Jan 2016

VSAPI OPR PATTERN File:

12.303.00

VSAPI OPR PATTERN Date:

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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