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BKDR_HUPIGON.MPE

April 26, 2016
 Analysis by: Jeanne Jocson
 ALIASES:

Backdoor.Win32.Hupigon.axor (Kaspersky), Backdoor.Hupigon.AXRD (BitDefender)

 PLATFORM:

Windows

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

  • 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 drops an AUTORUN.INF file to automatically execute the copies it drops when a user accesses the drives of an affected system.

However, as of this writing, the said sites are inaccessible. It deletes the initially executed copy of itself.

  TECHNICAL DETAILS

File Size:

655,872 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

28 Nov 2012

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 drops a copy of itself in the following folders using different file names:

  • %System%\_svrhost.exe
  • %Program Files%\Common Files\Microsoft Shared\MSINFO\svrhost.exe

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

Autostart Technique

This Trojan adds and runs the following services:

  • svrhost

Other System Modifications

This Trojan adds the following registry keys:

HKLM\SYSTEM\CurrentControlSet\
services\svrhost

It adds the following registry entries:

HKLM\SYSTEM\CurrentControlSet\
services\svrhost
Description = "Windows WorkGroup"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
services\svrhost
(Default) = ""

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
services\svrhost
Description = "Windows WorkGroup"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
services\svrhost
DisplayName = "Windows WorkGroup"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
services\svrhost
ErrorControl = "0"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
services\svrhost
ImagePath = "%Program Files%\Common Files\microsoft shared\MSInfo\svrhost.exe"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
services\svrhost
ObjectName = "LocalSystem"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
services\svrhost
Start = "2"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
services\svrhost
Type = "272"

Propagation

This Trojan drops the following copy of itself in all physical and removable drives:

  • {Drive Letter}:\svrhost.exe

It drops an AUTORUN.INF file to automatically execute the copies it drops when a user accesses the drives of an affected system.

Other Details

This Trojan connects to the following possibly malicious URL:

  • http://quiniao.{BLOCKED}p.net

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

It deletes the initially executed copy of itself

  SOLUTION

Minimum Scan Engine:

9.800

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

Disable this malware service

[ Learn More ]
  • svrhost

Step 4

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
    • svrhost

Step 5

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.
  • {Drive Letter}:\AutoRun.inf

Step 6

Scan your computer with your Trend Micro product to delete files detected as BKDR_HUPIGON.MPE. 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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