TSPY_CHISBURG.BO
Windows 2000, Windows XP, Windows Server 2003
![](/vinfo/imgFiles/legend.jpg)
Threat Type: Spyware
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
This spyware 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
2,995,712 bytes
EXE
Yes
08 Feb 2014
Arrival Details
This spyware 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 spyware drops the following copies of itself into the affected system:
- %User Temp%\Win Update\Win Update.exe
(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.)
It creates the following folders:
- %User Temp%\Win Update
- %User Temp%\Security
- %User Temp%\Window Update
- %User Profile%\Microsoft\Backups
- %User Temp%\Windows Updates
(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.)
Autostart Technique
This spyware adds the following registry entries to enable its automatic execution at every system startup:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
Win Update = "%User Temp%\Win Update\Win Update.exe"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
Security = "%User Temp%\Security\Security.exe"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
Window Update = "%User Temp%\Window Update\Window Update.exe"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
Windows Updates = "%User Temp%\Windows Updates\Windows Updates.exe"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
System = "%User Temp%\loa.exe"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
System = "%User Temp%\loa.exe"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Active Setup\Installed Components\828e61d4-90ca-43e6-896f-0fc0c1215dba
stubpath = "%User Temp%\loa.exe"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
System = "%User Profile%\Application Data\loa.exe"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
System = "%User Profile%\Application Data\loa.exe"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Active Setup\Installed Components\dde41878-be7c-4ce6-8b4c-348272989387
stubpath = "%User Profile%\Application Data\loa.exe"
Other System Modifications
This spyware modifies the following file(s):
- %User Profile%\Application Data\Microsoft
(Note: %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.)
It deletes the following files:
- {malware path and file name}:zone.identifier
- %User Temp%\se.exe:Zone.Identifier
- %User Temp%\monn.exe:Zone.Identifier
- %User Startup%\monn.exe:Zone.Identifier
- %User Temp%\logmail.txt
- %User Temp%\mo.exe:Zone.Identifier
- %Windows%\Microsoft.NET\Framework\v2.0.50727\config\security.config.cch.1160.61921
- %Windows%\Microsoft.NET\Framework\v2.0.50727\config\enterprisesec.config.cch.1160.61921
- %User Profile%\v2.0.50727.42\security.config.cch.1160.62718
- %User Temp%\uP6n4AERHH.ini
- %User Temp%\4gXsKxqihU.ini
(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 Startup% is the current user's Startup folder, which is usually C:\Windows\Profiles\{user name}\Start Menu\Programs\Startup on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Start Menu\Programs\Startup on Windows NT, and C:\Documents and Settings\{User name}\Start Menu\Programs\Startup.. %Windows% is the Windows folder, which is usually C:\Windows.. %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.)
It adds the following registry keys:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
ESENT\Process\mo
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
ESENT\Process\mo\
DEBUG
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Active Setup\Installed Components\828e61d4-90ca-43e6-896f-0fc0c1215dba
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Active Setup\Installed Components\dde41878-be7c-4ce6-8b4c-348272989387
It modifies the following registry entries:
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\Eventlog\Application\
ESENT
EventMessageFile = "%System%\ESENT.dll"
(Note: The default value data of the said registry entry is {random values}.)
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\Eventlog\Application\
ESENT
CategoryMessageFile = "%System%\ESENT.dll"
(Note: The default value data of the said registry entry is {random values}.)
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\Eventlog\Application\
ESENT
CategoryCount = "1"
(Note: The default value data of the said registry entry is 10.)
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\Eventlog\Application\
ESENT
TypesSupported = "7"
(Note: The default value data of the said registry entry is 7.)
Dropping Routine
This spyware drops the following files:
- %User Temp%\se.exe
- %User Temp%\monn.exe
- %User Temp%\mo.exe
- %User Temp%\loa.exe
- %User Profile%\Microsoft\Crypto
- %User Profile%\Crypto\RSA
- %User Profile%\RSA\S-1-5-21-1645522239-1292428093-682003330-1003
- %User Profile%\Application Data\pid.txt
- %User Profile%\Application Data\pidloc.txt
- %User Temp%\logff.txt
- %User Temp%\Security\Security.exe
- %User Temp%\Window Update\Window Update.exe
- %User Temp%\Windows Updates\Windows Updates.exe
- %User Startup%\monn.exe
(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.. %User Startup% is the current user's Startup folder, which is usually C:\Windows\Profiles\{user name}\Start Menu\Programs\Startup on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Start Menu\Programs\Startup on Windows NT, and C:\Documents and Settings\{User name}\Start Menu\Programs\Startup.)
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
Restart in Safe Mode
Step 3
Delete this registry key
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\Microsoft\ESENT\Process
- mo
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\ESENT\Process\mo
- DEBUG
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Active Setup\Installed Components
- 828e61d4-90ca-43e6-896f-0fc0c1215dba
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Active Setup\Installed Components
- dde41878-be7c-4ce6-8b4c-348272989387
Step 4
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_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- Win Update = "%User Temp%\Win Update\Win Update.exe"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- Security = "%User Temp%\Security\Security.exe"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- Window Update = "%User Temp%\Window Update\Window Update.exe"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- Windows Updates = "%User Temp%\Windows Updates\Windows Updates.exe"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- System = "%User Temp%\loa.exe"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
- System = "%User Temp%\loa.exe"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Active Setup\Installed Components\828e61d4-90ca-43e6-896f-0fc0c1215dba
- stubpath = "%User Temp%\loa.exe"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- System = "%User Profile%\Application Data\loa.exe"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
- System = "%User Profile%\Application Data\loa.exe"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Active Setup\Installed Components\dde41878-be7c-4ce6-8b4c-348272989387
- stubpath = "%User Profile%\Application Data\loa.exe"
Step 5
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_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\Eventlog\Application\ESENT
- From: EventMessageFile = "%System%\ESENT.dll"
To: EventMessageFile = ""{random values}""
- From: EventMessageFile = "%System%\ESENT.dll"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\Eventlog\Application\ESENT
- From: CategoryMessageFile = "%System%\ESENT.dll"
To: CategoryMessageFile = ""{random values}""
- From: CategoryMessageFile = "%System%\ESENT.dll"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\Eventlog\Application\ESENT
- From: CategoryCount = "1"
To: CategoryCount = ""10""
- From: CategoryCount = "1"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\Eventlog\Application\ESENT
- From: TypesSupported = "7"
To: TypesSupported = ""7""
- From: TypesSupported = "7"
Step 6
Search and delete these components
- %User Temp%\se.exe
- %User Temp%\monn.exe
- %User Temp%\mo.exe
- %User Temp%\loa.exe
- %User Profile%\Microsoft\Crypto
- %User Profile%\Crypto\RSA
- %User Profile%\RSA\S-1-5-21-1645522239-1292428093-682003330-1003
- %User Profile%\Application Data\pid.txt
- %User Profile%\Application Data\pidloc.txt
- %User Temp%\logff.txt
- %User Temp%\Security\Security.exe
- %User Temp%\Window Update\Window Update.exe
- %User Temp%\Windows Updates\Windows Updates.exe
- %User Startup%\monn.exe
Step 7
Search and delete these folders
- %User Temp%\Win Update
- %User Temp%\Security
- %User Temp%\Window Update
- %User Profile%\Microsoft\Backups
- %User Temp%\Windows Updates
Step 8
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TSPY_CHISBURG.BO. 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 9
Restore deleted/modified files and/or registry entries from backup
*Note: Only Microsoft-related files/keys/values will be restored. If this malware/grayware also deleted registry keys/values related to programs that are not from Microsoft, please reinstall those programs on your computer.
- %User Profile%\Application Data\Microsoft
Step 10
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.
- {malware path and file name}:zone.identifier
- %User Temp%\se.exe:Zone.Identifier
- %User Temp%\monn.exe:Zone.Identifier
- %User Startup%\monn.exe:Zone.Identifier
- %User Temp%\logmail.txt
- %User Temp%\mo.exe:Zone.Identifier
- %Windows%\Microsoft.NET\Framework\v2.0.50727\config\security.config.cch.1160.61921
- %Windows%\Microsoft.NET\Framework\v2.0.50727\config\enterprisesec.config.cch.1160.61921
- %User Profile%\v2.0.50727.42\security.config.cch.1160.62718
- %User Temp%\uP6n4AERHH.ini
- %User Temp%\4gXsKxqihU.ini
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