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Backdoor.Win32.HUPIGON.AC

April 05, 2019
 Modified by: Kiyoshi Obuchi
 ALIASES:

Backdoor:Win32/Hupigon.CK (Microsoft); Backdoor.Win32.Hupigon.evc (Kaspersky)

 PLATFORM:

Windows

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

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW


This Backdoor 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:

388,096 bytes

File Type:

EXE

Initial Samples Received Date:

05 Apr 2019

Arrival Details

This Backdoor 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 Backdoor drops the following copies of itself into the affected system:

  • %System%\RpcSs.exe
  • %Program Files%\cOmmON filES\MiCRoSoFT shAReD\MSInfo\_RpcSs.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 default Program Files folder, usually C:\Program Files in Windows 2000, Server 2003, and XP (32-bit), Vista (32-bit), 7 (32-bit), and 8 (32-bit), or C:\Program Files (x86) in Windows XP (64-bit), Vista (64-bit), 7 (64-bit), and 8 (64-bit).)

It adds the following processes:

  • %System%\RpcSs.exe
  • %System%\D3l3t.bat
  • %System%\mmc.exe
  • %System%\svchost.exe

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

Autostart Technique

This Backdoor 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\RpcService
DisplayName = "Remote Procedure Call (RPC) Service"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\RpcService
ImagePath = "%System%\RpcSs.exe"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\RpcService
Start = "SERVICE_AUTO_START"

Dropping Routine

This Backdoor drops the following files:

  • %System%\D3l3t.bat

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

Other Details

This Backdoor deletes itself after execution.

  SOLUTION

Minimum Scan Engine:

9.850

FIRST VSAPI PATTERN FILE:

14.914.09

FIRST VSAPI PATTERN DATE:

03 Apr 2019

VSAPI OPR PATTERN File:

14.915.00

VSAPI OPR PATTERN Date:

04 Apr 2019

Step 1

Before doing any scans, Windows 7, Windows 8, Windows 8.1, and Windows 10 users must disable System Restore to allow full scanning of their computers.

Step 2

Identify and terminate files detected as Backdoor.Win32.HUPIGON.AC

[ Learn More ]
  1. Windows Task Manager may not display all running processes. In this case, please use a third-party process viewer, preferably Process Explorer, to terminate the malware/grayware/spyware file. You may download the said tool here.
  2. If the detected file is displayed in either Windows Task Manager or Process Explorer but you cannot delete it, restart your computer in safe mode. To do this, refer to this link for the complete steps.
  3. If the detected file is not displayed in either Windows Task Manager or Process Explorer, continue doing the next steps.

Step 3

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%\D3l3t.bat

Step 4

Scan your computer with your Trend Micro product to delete files detected as Backdoor.Win32.HUPIGON.AC. 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 the following Trend Micro Support pages for more information:


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