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BKDR_HUPIGO.SMIB

June 20, 2013
 ALIASES:

Backdoor:Win32/Zegost.B (Microsoft); [0000902c.EXE]:BackDoor-CEP.gen.cn, [00006e00.EXE]:Generic Backdoor.uc (McAfee); Suspicious.MH690 (Symantec); Backdoor.Win32.Hupigon.dudu (Kaspersky); Trojan.Win32.Generic!BT (Sunbelt); Trojan.Dropper.Delf.BDF (FSecure)

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

 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.

  TECHNICAL DETAILS

File Size:

239,616 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

04 May 2012

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 creates the following folders:

  • %User Profile%\DRM\%SESSIONNAME%

Other System Modifications

This backdoor deletes the following files:

  • %User Profile%\%SESSIONNAME%\rmhgq.cc3
  • encoeesem
  • %User Profile%\locals~1\fqswekktuf
  • ppsnnctcbs
  • %Windows%\SoftwareDistribution\DataStore\Logs\edbtmp.log

(Note: %Windows% is the Windows folder, which is usually C:\Windows.)

It adds the following registry keys:

HKEY_LOCAL_MACHINE\sOFtwaRe\encoeesem

HKEY_LOCAL_MACHINE\sOFtwaRe\encoeesemm

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Comhidserv70

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Control\MediaResources\msvideo

It adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\encoeesem
seRVicemAIN = "NPGetResourceParent"

HKEY_LOCAL_MACHINE\SOFTWARE\encoeesem
seRVicedlL = "%User Profile%\%SESSIONNAME%\rmhgq.cc3"

HKEY_LOCAL_MACHINE\SOFTWARE\encoeesem
module = "%User Profile%\locals~1\fqswekktuf"

Dropping Routine

This backdoor drops the following files:

  • %User Temp%\MU.exe
  • %User Temp%\server.exe
  • %User Temp%\sxfryhnnln.dat
  • %User Profile%\locals~1\fqswekktuf

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.. %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.)

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine:

9.200

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

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\sOFtwaRe
    • encoeesem
  • In HKEY_LOCAL_MACHINE\sOFtwaRe
    • encoeesemm
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft
    • Comhidserv70
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\MediaResources
    • msvideo

Step 3

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\SOFTWARE\encoeesem
    • seRVicemAIN = "NPGetResourceParent"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\encoeesem
    • seRVicedlL = "%User Profile%\%SESSIONNAME%\rmhgq.cc3"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\encoeesem
    • module = "%User Profile%\locals~1\fqswekktuf"

Step 4

Search and delete these components

[ Learn More ]
There may be some components 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.
  • %User Temp%\MU.exe
  • %User Temp%\server.exe
  • %User Temp%\sxfryhnnln.dat
  • %User Profile%\locals~1\fqswekktuf

Step 5

Search and delete this folder

[ Learn More ]
Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden folders in the search result.
  • %User Profile%\DRM\%SESSIONNAME%

Step 6

Scan your computer with your Trend Micro product to delete files detected as BKDR_HUPIGO.SMIB. 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.

Step 7

Restore this file from backup only Microsoft-related files will be restored. If this malware/grayware also deleted files related to programs that are not from Microsoft, please reinstall those programs on you computer again.

  • %User Profile%\%SESSIONNAME%\rmhgq.cc3
  • encoeesem
  • %User Profile%\locals~1\fqswekktuf
  • ppsnnctcbs
  • %Windows%\SoftwareDistribution\DataStore\Logs\edbtmp.log


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