TSPY_DELF.ESH
ALIASES:
TrojanDropper:Win32/Small (Microsoft); [00001304.EXE]:BackDoor-DLH (McAfee); Backdoor.Pcclient (Symantec); Trojan-Dropper.Win32.Agent.bbq (Kaspersky); BehavesLike.Win32.Malware.spi (mx-v) (Sunbelt); Trojan.Spy.Delf.NPB (FSecure)
PLATFORM:
Windows 2000, Windows XP, Windows Server 2003
OVERALL RISK RATING:
REPORTED INFECTION:
SYSTEM IMPACT RATING:
INFORMATION EXPOSURE:
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.
It deletes itself after execution.
TECHNICAL DETAILS
File Size:
134,656 bytes
File Type:
EXE
Memory Resident:
No
Initial Samples Received Date:
03 Nov 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.
Other System Modifications
This spyware deletes the following files:
- %System%\trkwkssw.dll
- %System%\trkwksswsw.dll
- %System%\trkwksswswsw.dll
- %System%\trkwksswswswsw.dll
- %System%\trkwksswswswswsw.dll
- %System%\trkwksswswswswswsw.dll
- %System%\trkwksswswswswswswsw.dll
- %System%\trkwksswswswswswswswsw.dll
- %System%\trkwksswswswswswswswswsw.dll
- %System%\trkwksswswswswswswswswswsw.dll
- %System%\trkwksswswswswswswswswswswsw.dll
- %System%\trkwksswswswswswswswswswswswsw.dll
- %System%\trkwksswswswswswswswswswswswswsw.dll
- %System%\trkwksswswswswswswswswswswswswswsw.dll
- %System%\trkwksswswswswswswswswswswswswswswsw.dll
- %System%\trkwksswswswswswswswswswswswswswswswsw.dll
- %System%\trkwksswswswswswswswswswswswswswswswswsw.dll
- %System%\trkwksswswswswswswswswswswswswswswswswswsw.dll
- %System%\trkwksswswswswswswswswswswswswswswswswswswsw.dll
- %System%\trkwksswswswswswswswswswswswswswswswswswswswsw.dll
- %System%\trkwksswswswswswswswswswswswswswswswswswswswswsw.dll
- %System%\trkwksswswswswswswswswswswswswswswswswswswswswswsw.dll
- %System%\trkwksswswswswswswswswswswswswswswswswswswswswswswsw.dll
- %System%\trkwksswswswswswswswswswswswswswswswswswswswswswswswsw.dll
- %System%\trkwksswswswswswswswswswswswswswswswswswswswswswswswswsw.dll
- %System%\trkwksswswswswswswswswswswswswswswswswswswswswswswswswswsw.dll
- %System%\trkwksswswswswswswswswswswswswswswswswswswswswswswswswswswsw.dll
- %System%\trkwksswswswswswswswswswswswswswswswswswswswswswswswswswswswsw.dll
- %System%\trkwksswswswswswswswswswswswswswswswswswswswswswswswswswswswswsw.dll
- %System%\trkwksswswswswswswswswswswswswswswswswswswswswswswswswswswswswswsw.dll
- %System%\trkwksswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswsw.dll
- %System%\trkwksswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswsw.dll
- %System%\trkwksswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswsw.dll
- %System%\trkwksswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswsw.dll
- %System%\trkwksswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswsw.dll
- %System%\trkwksswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswsw.dll
- %System%\trkwksswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswsw.dll
- %System%\trkwksswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswsw.dll
- %System%\trkwksswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswsw.dll
- %System%\trkwksswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswsw.dll
- %System%\trkwksswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswsw.dll
- %System%\trkwksswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswsw.dll
- %System%\trkwksswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswsw.dll
- %System%\trkwksswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswsw.dll
- %System%\trkwksswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswsw.dll
- %System%\trkwksswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswsw.dll
- %System%\trkwksswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswsw.dll
- %System%\trkwksswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswsw.dll
- %System%\trkwksswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswsw.dll
- %System%\trkwksswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswsw.dll
- %System%\trkwksswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswsw.dll
- %System%\trkwksswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswsw.dll
- %System%\trkwksswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswsw.dll
- %System%\trkwksswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswsw.dll
- %System%\trkwksswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswsw.dll
- %System%\trkwksswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswsw.dll
- %System%\trkwksswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswsw.dll
- %System%\trkwksswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswsw.dll
- %System%\trkwksswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswsw.dll
- %System%\trkwksswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswsw.dll
- %System%\trkwksswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswsw.dll
- %System%\trkwksswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswsw.dll
- %System%\trkwksswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswsw.dll
- %System%\trkwksswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswsw.dll
- %System%\trkwksswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswsw.dll
- %System%\trkwksswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswsw.dll
- %System%\trkwksswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswsw.dll
- %System%\trkwksswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswsw.dll
- %System%\Swz2.bat
(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.)
It adds the following registry keys:
HKEY_LOCAL_MACHINE\Software\Microsoft\
Windows NT\CurrentVersion\Winlogon\
Notify\TrkWks
It adds the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Winlogon\
Notify\TrkWks
Asynchronous = "1"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Winlogon\
Notify\TrkWks
Impersonate = "0"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Winlogon\
Notify\TrkWks
DllName = "%System%\trkwkssw.dll"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Winlogon\
Notify\TrkWks
Startup = "IESetup"
Dropping Routine
This spyware drops the following files:
- %System%\Swz97.dll
- %System%\Swz2.bat
- %System%\trkwkssw.dll
(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.)
Other Details
This spyware deletes itself after execution.
This report is generated via an automated analysis system.
SOLUTION
Minimum Scan Engine:
9.300
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
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\Microsoft\Windows NT\CurrentVersion\Winlogon\Notify
- TrkWks
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\Microsoft\Windows NT\CurrentVersion\Winlogon\Notify\TrkWks
- Asynchronous = "1"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Notify\TrkWks
- Impersonate = "0"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Notify\TrkWks
- DllName = "%System%\trkwkssw.dll"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Notify\TrkWks
- Startup = "IESetup"
Step 4
Search and delete these files
[ Learn More ]
There may be some component files 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. - %System%\Swz97.dll
- %System%\Swz2.bat
- %System%\trkwkssw.dll
Step 5
Scan your computer with your Trend Micro product to delete files detected as TSPY_DELF.ESH. 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 6
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.
- %System%\trkwkssw.dll
- %System%\trkwksswsw.dll
- %System%\trkwksswswsw.dll
- %System%\trkwksswswswsw.dll
- %System%\trkwksswswswswsw.dll
- %System%\trkwksswswswswswsw.dll
- %System%\trkwksswswswswswswsw.dll
- %System%\trkwksswswswswswswswsw.dll
- %System%\trkwksswswswswswswswswsw.dll
- %System%\trkwksswswswswswswswswswsw.dll
- %System%\trkwksswswswswswswswswswswsw.dll
- %System%\trkwksswswswswswswswswswswswsw.dll
- %System%\trkwksswswswswswswswswswswswswsw.dll
- %System%\trkwksswswswswswswswswswswswswswsw.dll
- %System%\trkwksswswswswswswswswswswswswswswsw.dll
- %System%\trkwksswswswswswswswswswswswswswswswsw.dll
- %System%\trkwksswswswswswswswswswswswswswswswswsw.dll
- %System%\trkwksswswswswswswswswswswswswswswswswswsw.dll
- %System%\trkwksswswswswswswswswswswswswswswswswswswsw.dll
- %System%\trkwksswswswswswswswswswswswswswswswswswswswsw.dll
- %System%\trkwksswswswswswswswswswswswswswswswswswswswswsw.dll
- %System%\trkwksswswswswswswswswswswswswswswswswswswswswswsw.dll
- %System%\trkwksswswswswswswswswswswswswswswswswswswswswswswsw.dll
- %System%\trkwksswswswswswswswswswswswswswswswswswswswswswswswsw.dll
- %System%\trkwksswswswswswswswswswswswswswswswswswswswswswswswswsw.dll
- %System%\trkwksswswswswswswswswswswswswswswswswswswswswswswswswswsw.dll
- %System%\trkwksswswswswswswswswswswswswswswswswswswswswswswswswswswsw.dll
- %System%\trkwksswswswswswswswswswswswswswswswswswswswswswswswswswswswsw.dll
- %System%\trkwksswswswswswswswswswswswswswswswswswswswswswswswswswswswswsw.dll
- %System%\trkwksswswswswswswswswswswswswswswswswswswswswswswswswswswswswswsw.dll
- %System%\trkwksswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswsw.dll
- %System%\trkwksswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswsw.dll
- %System%\trkwksswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswsw.dll
- %System%\trkwksswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswsw.dll
- %System%\trkwksswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswsw.dll
- %System%\trkwksswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswsw.dll
- %System%\trkwksswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswsw.dll
- %System%\trkwksswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswsw.dll
- %System%\trkwksswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswsw.dll
- %System%\trkwksswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswsw.dll
- %System%\trkwksswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswsw.dll
- %System%\trkwksswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswsw.dll
- %System%\trkwksswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswsw.dll
- %System%\trkwksswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswsw.dll
- %System%\trkwksswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswsw.dll
- %System%\trkwksswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswsw.dll
- %System%\trkwksswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswsw.dll
- %System%\trkwksswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswsw.dll
- %System%\trkwksswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswsw.dll
- %System%\trkwksswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswsw.dll
- %System%\trkwksswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswsw.dll
- %System%\trkwksswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswsw.dll
- %System%\trkwksswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswsw.dll
- %System%\trkwksswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswsw.dll
- %System%\trkwksswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswsw.dll
- %System%\trkwksswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswsw.dll
- %System%\trkwksswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswsw.dll
- %System%\trkwksswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswsw.dll
- %System%\trkwksswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswsw.dll
- %System%\trkwksswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswsw.dll
- %System%\trkwksswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswsw.dll
- %System%\trkwksswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswsw.dll
- %System%\trkwksswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswsw.dll
- %System%\trkwksswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswsw.dll
- %System%\trkwksswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswsw.dll
- %System%\trkwksswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswsw.dll
- %System%\trkwksswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswsw.dll
- %System%\trkwksswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswswsw.dll
- %System%\Swz2.bat
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