TSPY_BOOTKOR.AF
Windows 2000, Windows XP, Windows Server 2003
Threat Type: Spyware
Destructiveness: No
Encrypted: Yes
In the wild: Yes
OVERVIEW
Downloaded from the Internet
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.
It creates an event. It deletes itself after execution.
TECHNICAL DETAILS
952,288 bytes
EXE, DLL
Yes
10 Aug 2012
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 component file(s):
- %System%\gbp.ini
- %System%\golfinfo.ini
- %System%\{random filename1}.dll - also detected as TSPY_BOOTKOR.AF
- %System%\{random filename2}.exe - also detected as TSPY_BOOTKOR.AF
- %System%\{random filename1}.exe - also detected as TSPY_BOOTKOR.AF
(Note: %System% is the Windows system folder, which is usually C:\Windows\System on Windows 98 and ME, C:\WINNT\System32 on Windows NT and 2000, or C:\Windows\System32 on Windows XP and Server 2003.)
Autostart Technique
This spyware creates the following service using its DLL component:
- ServiceName={random}
- Binary Path="%SystemRoot%\System32\svchost.exe -k {random}"
Other System Modifications
This spyware modifies the following registry entries:
HKEY_USERS\.DEFAULT\Software\
Microsoft\Windows\CurrentVersion\
Explorer\Shell Folders
Cookies = "C:\Documents and Settings\LocalService\Cookies"
(Note: The default value data of the said registry entry is "C:\Documents and Settings\NetworkService\Cookies".)
HKEY_USERS\.DEFAULT\Software\
Microsoft\Windows\CurrentVersion\
Explorer\Shell Folders
Cache = "C:\Documents and Settings\LocalService\Local Settings\Temporary Internet Files"
(Note: The default value data of the said registry entry is "C:\Documents and Settings\NetworkService\Local Settings\Temporary Internet Files".)
It also creates the following registry entry(ies) as part of its installation routine:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\SvcHost
{random2} = "{random1}"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Enum\Root\LEGACY_{random1}
NextInstance = dword:00000001
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Enum\Root\LEGACY_{random1}\
0000
Service = "{random1}"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Enum\Root\LEGACY_{random1}\
0000
Legacy = dword:00000001
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Enum\Root\LEGACY_{random1}\
0000
ConfigFlags = dword:00000000
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Enum\Root\LEGACY_{random1}\
0000
Class = "LegacyDriver"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Enum\Root\LEGACY_{random1}\
0000
ClassGUID = "{8ECC055D-047F-11D1-A537-0000F8753ED1}"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Enum\Root\LEGACY_{random1}\
0000
DeviceDesc = "{random3}"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Enum\Root\LEGACY_{random1}\
0000\Control
ActiveService = "{random1}"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\{random1}
ImagePath = "%System%\svchost.exe -k {random2}"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\{random1}
DisplayName = "{random3}"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\{random1}\Parameters
ServiceDll = "%System%\{random filename1}.dll"
Information Theft
This spyware sends the gathered information to the following site/s using credentials from its configuration file:
- {BLOCKED}.{BLOCKED}.75.28
- {BLOCKED}.{BLOCKED}.109.4
Other Details
Based on analysis of the codes, it has the following capabilities:
- Collect system information and send to the specified remote servers.
- Update its copy.
- Capture Screenshots when the process PMCLIENT.EXE is found.
It checks for the presence of the following process(es):
- PMCLIENT.EXE
It creates the following event(s):
- "CupidIsInstalling"
It deletes itself after execution.
SOLUTION
9.200
9.302.09
04 Aug 2012
Step 1
For Windows XP and Windows Server 2003 users, before doing any scans, please make sure you disable System Restore to allow full scanning of your computer.
Step 2
Scan your computer with your Trend Micro product and note files detected as TSPY_BOOTKOR.AF
Step 3
Restart in Safe Mode
Step 4
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\Windows NT\CurrentVersion\SvcHost
- {random2} = "{random1}"
- {random2} = "{random1}"
- In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services
- {random1}
- {random1}
- In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Enum\Root
- LEGACY_{random1}
- LEGACY_{random1}
Step 5
Restore this modified registry value
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_USERS\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders
- From: Cookies = "C:\\Documents and Settings\\LocalService\\Cookies"
To: Cookies = "C:\\Documents and Settings\\NetworkService\\Cookies"
- From: Cookies = "C:\\Documents and Settings\\LocalService\\Cookies"
- In HKEY_USERS\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders
- From: Cache = "C:\\Documents and Settings\\LocalService\\Local Settings\\Temporary Internet Files"
To: Cache = "C:\\Documents and Settings\\NetworkService\\Local Settings\\Temporary Internet Files"
- From: Cache = "C:\\Documents and Settings\\LocalService\\Local Settings\\Temporary Internet Files"
Step 6
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TSPY_BOOTKOR.AF. 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.
Did this description help? Tell us how we did.