ALIASES:

Trojan:Win32/Dimnie.C (Microsoft); RDN/Generic.grp!in (McAfee); Trojan.Gen (Symantec); Trojan.MSIL.Crypt.hot (Kaspersky); Troj/Agent-AOBG (Sophos); Trojan.Win32.Generic!BT (Sunbelt); Trojan horse Crypt4.BIJO (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.

It deletes itself after execution.

  TECHNICAL DETAILS

File Size: 123,904 bytes
File Type: EXE
Memory Resident: Yes
Initial Samples Received Date: 07 Aug 2015

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.

Autostart Technique

This Trojan registers as a system service to ensure its automatic execution at every system startup by adding the following registry keys:

HKEY_LOCAL_MACHINE\System\CurrentControlSet\
Services\oibnvaer

HKEY_LOCAL_MACHINE\System\CurrentControlSet\
Services\oibnvaer\Parameters

Other System Modifications

This Trojan adds the following registry entries:

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\oibnvaer
ImagePath = "%SystemRoot%\System32\svchost.exe -k netsvcs"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\oibnvaer
ObjectName = "LocalSystem"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\oibnvaer
DisplayName = "oibnvaer"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\oibnvaer
Start = "2"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\oibnvaer
ErrorControl = "0"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\oibnvaer
Type = "2"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\oibnvaer
Description = "Provides Packet error Telephony ClipBook Networking."

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\oibnvaer\Parameters
ServiceDll = "%System%\qcjuihg.dll"

It modifies the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\SvcHost
netsvcs = "{random characters}"

(Note: The default value data of the said registry entry is {random values}.)

Dropping Routine

This Trojan drops the following files:

  • %System%\qcjuihg.dll

(Note: %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.)

Other Details

This Trojan connects to the following possibly malicious URL:

  • {BLOCKED}.138.4

It deletes itself after execution.

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine: 9.750

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

Restart in Safe Mode

[ Learn More ]

Step 3

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\System\CurrentControlSet\Services
    • oibnvaer
  • In HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\oibnvaer
    • Parameters

Step 4

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_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\oibnvaer
    • ImagePath = "%SystemRoot%\System32\svchost.exe -k netsvcs"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\oibnvaer
    • ObjectName = "LocalSystem"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\oibnvaer
    • DisplayName = "oibnvaer"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\oibnvaer
    • Start = "2"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\oibnvaer
    • ErrorControl = "0"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\oibnvaer
    • Type = "2"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\oibnvaer
    • Description = "Provides Packet error Telephony ClipBook Networking."
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\oibnvaer\Parameters
    • ServiceDll = "%System%\qcjuihg.dll"

Step 5

Restore these modified registry values

[ Learn More ]

Important:Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this only if you know how to or you can seek your system administrator's help. You may also check out this Microsoft article first before modifying your computer's registry.

  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\SvcHost
    • From: netsvcs = "{random characters}"
      To: netsvcs = ""{random values}""

Step 6

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.
  • %System%\qcjuihg.dll

Step 7

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