TSPY_TEPFER.ASL
PWS:Win32/Fareit.gen!C (Microsoft); PWS-Zbot.gen.ad (McAfee); Trojan Horse (Symantec); Trojan-PSW.Win32.Tepfer.hztn (Kaspersky); Trojan.Win32.Zbocheman.fb (v) (Sunbelt); Trojan horse PSW.Generic11.BSW (AVG)
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.
It deletes itself after execution.
TECHNICAL DETAILS
97,280 bytes
EXE
No
11 May 2013
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 creates the following folders:
- %User Profile%\Application Data\Nyri
(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.)
Other System Modifications
This spyware adds the following registry keys:
HKEY_CURRENT_USER\Software\WinRAR
HKEY_CURRENT_USER\Software\Microsoft\
Okseyd
HKEY_LOCAL_MACHINE\Software\Google\
Chrome\Extensions
It adds the following registry entries:
HKEY_CURRENT_USER\Software\WinRAR
HWID = "{random values}"
HKEY_CURRENT_USER\Software\WinRAR
Client Hash = "{random values}"
HKEY_CURRENT_USER\Software\WinRAR
1FDA774E3DA42B8517F40D91B95569A7 = "{random values}"
HKEY_CURRENT_USER\Software\WinRAR
BE451704D4347D4DA9FCA065BD53F3DB = "{random values}"
HKEY_CURRENT_USER\Software\Microsoft\
Okseyd
32321h4i = "hwgsVewaefoDjoUy?_CHAR(0x05)_?"
Dropping Routine
This spyware drops the following files:
- %User Temp%\41515.exe
- %User Temp%\47531.exe
- %User Profile%\Application Data\Nyri
- %User Profile%\Nyri\lodev.exe
- %Application Data%\iwekji.qec
- %User Profile%\Application Data\mayui.dll
(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.. %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming on Windows Vista and 7.)
Other Details
This spyware connects to the following possibly malicious URL:
- http://{BLOCKED}.131.158/{random path}
It deletes itself after execution.
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
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_CURRENT_USER\Software
- WinRAR
- In HKEY_CURRENT_USER\Software\Microsoft
- Okseyd
- In HKEY_LOCAL_MACHINE\Software\Google\Chrome
- Extensions
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_CURRENT_USER\Software\WinRAR
- HWID = "{random values}"
- In HKEY_CURRENT_USER\Software\WinRAR
- Client Hash = "{random values}"
- In HKEY_CURRENT_USER\Software\WinRAR
- 1FDA774E3DA42B8517F40D91B95569A7 = "{random values}"
- In HKEY_CURRENT_USER\Software\WinRAR
- BE451704D4347D4DA9FCA065BD53F3DB = "{random values}"
- In HKEY_CURRENT_USER\Software\Microsoft\Okseyd
- 32321h4i = "hwgsVewaefoDjoUy?_CHAR(0x05)_?"
Step 4
Search and delete these components
- %User Temp%\41515.exe
- %User Temp%\47531.exe
- %User Profile%\Application Data\Nyri
- %User Profile%\Nyri\lodev.exe
- %Application Data%\iwekji.qec
- %User Profile%\Application Data\mayui.dll
Step 5
Search and delete this folder
- %User Profile%\Application Data\Nyri
Step 6
Scan your computer with your Trend Micro product to delete files detected as TSPY_TEPFER.ASL. 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.