PE_HEZHI.B


 ALIASES:

Virus:Win32/Hezhi.D (Microsoft); W32/Hezhi.a (McAfee); W32.Hezhi (Symantec); Virus.Win32.Hezhi (Kaspersky); Virus.Win32.Hezhi.a (v) (Sunbelt); Win32/Bolzano.2122 (AVG)

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

 OVERALL RISK RATING:
 REPORTED INFECTION:

  • Threat Type: File infector

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW


This file infector arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

It disables Task Manager, Registry Editor, and Folder Options.

  TECHNICAL DETAILS

File Size:

50,688 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

11 Oct 2013

Arrival Details

This file infector arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Other System Modifications

This file infector adds the following registry entries:

HKEY_CLASSES_ROOT
.grp = "MSProgramGroup"

HKEY_CLASSES_ROOT
MSProgramGroup = "Microsoft Program Group"

HKEY_CLASSES_ROOT
MSProgramGroup\Shell\Open\Command = "{malware path and file name} %1"

It modifies the following registry entries:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\GrpConv
Log = "Init Application."

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

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\GrpConv
Log = "dros: ..."

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

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\GrpConv
Log = "dros: Renames."

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

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\GrpConv
Log = "dros: Copies."

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

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\GrpConv
Log = "dros: Deletes."

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

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\GrpConv
Log = "dros: Done."

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

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\GrpConv
Log = "Uninit Application."

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

It creates the following registry entry(ies) to disable Task Manager, Registry Tools and Folder Options:

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

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

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

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

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

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

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine:

9.300

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

Enable Registry Editor, Task Manager, and Folder options

[ Learn More ]
By doing this step, you also enable other applications/programs disabled by this malware/grayware/spyware.

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_CLASSES_ROOT
    • .grp = "MSProgramGroup"
  • In HKEY_CLASSES_ROOT
    • MSProgramGroup = "Microsoft Program Group"
  • In HKEY_CLASSES_ROOT
    • MSProgramGroup\Shell\Open\Command = "{malware path and file name} %1"

Step 4

Restore these modified registry values

[ Learn More ]

Important:Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this only if you know how to or you can seek your system administrator's help. You may also check out this Microsoft article first before modifying your computer's registry.

  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\GrpConv
    • From: Log = "Init Application."
      To: Log = ""Uninit Application.""
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\GrpConv
    • From: Log = "dros: ..."
      To: Log = ""Uninit Application.""
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\GrpConv
    • From: Log = "dros: Renames."
      To: Log = ""Uninit Application.""
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\GrpConv
    • From: Log = "dros: Copies."
      To: Log = ""Uninit Application.""
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\GrpConv
    • From: Log = "dros: Deletes."
      To: Log = ""Uninit Application.""
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\GrpConv
    • From: Log = "dros: Done."
      To: Log = ""Uninit Application.""
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\GrpConv
    • From: Log = "Uninit Application."
      To: Log = ""Uninit Application.""

Step 5

Scan your computer with your Trend Micro product to clean files detected as PE_HEZHI.B. 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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