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WORM_HUPIGON.RJ

September 30, 2015
 Analysis by: RonJay Kristoffer Caragay
 ALIASES:

TrojanDropper:Win32/Delfsnif.A (Microsoft); Backdoor.Win32.Hupigon.ahur (Kaspersky); W32.Versie.A (Symantec); Backdoor.Win32.Hupigon (Ikarus); Backdoor.Hupigon.AXRD (BitDefender); W32/Hupigon.AFH!tr.bdr (Fortinet); a variant of Win32/Hupigon (ESET-NOD32); Win32:Hupigon-FB [Trj] (Avast); BDS/Hupigon.Gen (Avira); BackDoor.Hupigon5.AVQA (AVG)

 PLATFORM:

Windows

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

  • Threat Type: Worm

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Via physical/removable drives, Downloaded from the Internet, Dropped by other malware, Propagates via removable drives


This worm arrives via removable drives. It 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.

It executes commands from a remote malicious user, effectively compromising the affected system. It connects to a website to send and receive information.

It deletes the initially executed copy of itself.

  TECHNICAL DETAILS

File Size:

752,640 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

24 Sep 2015

Payload:

Collects system information, Steals information

Arrival Details

This worm arrives via removable drives.

It 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 worm drops the following copies of itself into the affected system:

  • %System%\_Server46.exe
  • %Program Files%\Common Files\Microsoft Shared\MSInfo\Server46.exe
  • {Drive Letter}:\Server46.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.)

It drops the following files:

  • %Program Files%\Common Files\Microsoft Shared\MSInfo\SgotoDel.bat ← used to delete initially executed copy - deleted afterwards
  • %Program Files%\Common Files\Microsoft Shared\MSInfo\Beizhu.TXT ← log file

(Note: %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.)

It adds the following processes:

  • calc.exe
  • IEXPLORE.EXE

It injects codes into the following process(es):

  • created calc.exe
  • created IEXPLORE.EXE

Autostart Technique

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

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\dserver
Type = "272"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\dserver
Start = "2"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\dserver
ImagePath = "%Program Files%\Common Files\Microsoft Shared\MSINFO\Server46.exe"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\dserver
DisplayName = "Logical Disk Manger"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\dserver
ObjectName = "LocalSystem"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\dserver
Description = "Detects and monitors new hard disk drives and sends disk volume"

It 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\dserver

Other System Modifications

This worm modifies the following registry entries:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
Explorer
NoDriveTypeAutoRun = "0"

(Note: The default value data of the said registry entry is FF.)

Propagation

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

  • {Drive Letter}:\Server46.exe

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

The said .INF file contains the following strings:

[AutoRun]
open=Server46.exe
shellexecute=Server46.exe
shell\Auto\command=Server46.exe

Backdoor Routine

This worm executes the following commands from a remote malicious user:

  • Logs keystroke
  • Capture Video
  • Record Audio
  • Snapshot
  • Manage Services
  • Download and Execute files
  • Create,Delete,Modify Files
  • Terminate Process
  • Perform Remote Shell
  • Shutdown System
  • Perform DDoS attack
  • Change Desktop wallpaper
  • Change Startpage or Homepage
  • Disable Remote Desktop
  • Delete npkcrypt.sys
  • Drops URL link in custom Favorites

It connects to the following websites to send and receive information:

  • http://www.{BLOCKED}e.com/ip.txt

As of this writing, the said sites are inaccessible.

Information Theft

This worm gathers the following data:

  • Computer Name
  • Network Adapters
  • CPU speed
  • Memory Size
  • OS version
  • Service Packs

Other Details

This worm deletes the initially executed copy of itself

  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

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

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. Before you could do this, you must restart in Safe Mode. For instructions on how to do this, you may refer to this page If the preceding step requires you to restart in safe mode, you may proceed to edit the system registry.

  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services
    • dserver

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.
  • %Program Files%\Common Files\Microsoft Shared\MSInfo\SgotoDel.bat
  • %Program Files%\Common Files\Microsoft Shared\MSInfo\Beizhu.TXT

Step 6

Search and delete AUTORUN.INF files created by WORM_HUPIGON.RJ that contain these strings

[ Learn More ]
[AutoRun]
open=Server46.exe
shellexecute=Server46.exe
shell\Auto\command=Server46.exe

Step 7

Restore this modified 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_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer
    • From: NoDriveTypeAutoRun = "0"
      To: NoDriveTypeAutoRun = FF

Step 8

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