PE_HEZHI.B
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)
Windows 2000, Windows XP, Windows Server 2003
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
50,688 bytes
EXE
No
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
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
Step 3
Delete this registry value
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
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.""
- From: Log = "Init Application."
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\GrpConv
- From: Log = "dros: ..."
To: Log = ""Uninit Application.""
- From: Log = "dros: ..."
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\GrpConv
- From: Log = "dros: Renames."
To: Log = ""Uninit Application.""
- From: Log = "dros: Renames."
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\GrpConv
- From: Log = "dros: Copies."
To: Log = ""Uninit Application.""
- From: Log = "dros: Copies."
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\GrpConv
- From: Log = "dros: Deletes."
To: Log = ""Uninit Application.""
- From: Log = "dros: Deletes."
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\GrpConv
- From: Log = "dros: Done."
To: Log = ""Uninit Application.""
- From: Log = "dros: Done."
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\GrpConv
- From: Log = "Uninit Application."
To: Log = ""Uninit Application.""
- From: 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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