BKDR_HUPIGON.ARQ

August 09, 2017
 Analysis by: Michael Jay Villanueva
 ALIASES:

TrojanDropper:Win32/Hupigon.gen!A (Microsoft); Backdoor.Win32.Hupigon.aai (Kaspersky); Backdoor.Graybird (Symantec)

 PLATFORM:

Windows

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

  • 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 the initially executed copy of itself.

  TECHNICAL DETAILS

File Size:

301,056 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

07 Jun 2017

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:

  • %Program Files%\Internet Explorer\Connection Wizard\msicw.exe

(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 drops and executes the following files:

  • %Windows%\uninstal.bat

(Note: %Windows% is the Windows folder, where it usually is C:\Windows 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\srservice
Description = ±¾µØÖ´ÐÐϵͳ»¹Ô­¹¦ÄÜ¡£ Ҫֹͣ·þÎñ£¬Çë´Ó¡°ÎҵĵçÄÔ¡±µÄÊôÐÔÖеÄϵͳ»¹Ô­Ñ¡Ï¹Ø±Õϵͳ»¹Ô­

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\srservice
DisplayName = System local Service

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\srservice
ErrorControl = 0

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\srservice
ImagePath = “%Program Files%\Internet Explorer\Connection Wizard\msicw.exe”

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\srservice
ObjectName = LocalSystem

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\srservice
Start = 2

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\srservice
Type = 110

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\srservice

Other Details

This Backdoor deletes the initially executed copy of itself