TROJ_PAKES_0000007.TOMA
PWS:Win32/Zbot.A (Microsoft); PWS-Zbot.gen.cz (McAfee); Trojan Horse (Symantec); Packed.Win32.Katusha.o (Kaspersky); Trojan.Generic.3015794 (FSecure)
Windows 2000, Windows XP, Windows Server 2003
![](/vinfo/imgFiles/legend.jpg)
Threat Type: Trojan
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
This Trojan 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
193,536 bytes
EXE
No
04 Jan 2012
Arrival Details
This Trojan 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 Trojan drops the following copies of itself into the affected system:
- %System%\wsnpoema.exe
(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 creates the following folders:
- %System Root%\Documents and Settings
- %System Root%\Documents and Settings\All Users
- %User Profile%\Application Data
- %User Profile%\Application Data\Microsoft
- %User Profile%\Microsoft\Network
- %User Profile%\Network\Connections
- %User Profile%\Connections\Pbk
- %System%\wsnpoema
(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.. %User Profile% is the current user's profile folder, which is usually C:\Windows\Profiles\{user name} on Windows 98 and ME, C:\WINNT\Profiles\{user name} on Windows NT, and C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003.. %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 System Modifications
This Trojan deletes the following files:
- %System%\wsnpoema.exe
(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 entries:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Winlogon
userinit = "%System%\userinit.exe,%System%\wsnpoema.exe,"
HKEY_CURRENT_USER\Software\Microsoft\
Windows NT\CurrentVersion\Network
UID = "BRIAN-372130D4B_00008F5F"
HKEY_CURRENT_USER\Software\Microsoft\
Windows NT\CurrentVersion\Network
UID = "BRIAN-372130D4B_0000B12F"
HKEY_CURRENT_USER\Software\Microsoft\
Windows NT\CurrentVersion\Network
UID = "BRIAN-372130D4B_0000CDA0"
HKEY_CURRENT_USER\Software\Microsoft\
Windows NT\CurrentVersion\Network
UID = "BRIAN-372130D4B_0000DF25"
Dropping Routine
This Trojan drops the following files:
- %User Profile%\Pbk\rasphone.pbk
(Note: %User Profile% is the current user's profile folder, which is usually C:\Windows\Profiles\{user name} on Windows 98 and ME, C:\WINNT\Profiles\{user name} on Windows NT, and C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003.)
Other Details
This Trojan connects to the following possibly malicious URL:
- http://{BLOCKED}kleinstuffz.com/calvinklein2/cfg.bin
This report is generated via an automated analysis system.
SOLUTION
9.200
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 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_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon
- userinit="%System%\userinit.exe,%System%\wsnpoema.exe,"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows NT\CurrentVersion\Network
- UID="BRIAN-372130D4B_00008F5F"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows NT\CurrentVersion\Network
- UID="BRIAN-372130D4B_0000B12F"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows NT\CurrentVersion\Network
- UID="BRIAN-372130D4B_0000CDA0"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows NT\CurrentVersion\Network
- UID="BRIAN-372130D4B_0000DF25"
Step 3
Search and delete these folders
- %System Root%\Documents and Settings
- %System Root%\Documents and Settings\All Users
- %User Profile%\Application Data
- %User Profile%\Application Data\Microsoft
- %User Profile%\Microsoft\Network
- %User Profile%\Network\Connections
- %User Profile%\Connections\Pbk
- %System%\wsnpoema
Step 4
Search and delete this file
Step 5
Scan your computer with your Trend Micro product to delete files detected as TROJ_PAKES_0000007.TOMA. 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%\wsnpoema.exe
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