PE_CEKAR.SM2
Virus:Win32/Cekar.B (Microsoft); W32/MumaWow.d!inf (McAfee); W32.Mumawow.F!inf (Symantec); Trojan-Dropper.Win32.Agent.fhup (Kaspersky); Virus.Win32.Cekar.gen (v) (Sunbelt); Win32.Worm.Cekar.I (FSecure)
Windows 2000, Windows XP, Windows Server 2003

Threat Type: File infector
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
This file infector 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
Arrival Details
This file infector 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 file infector creates the following folders:
- %Windows%\Fonts\syn00-50-56-8E-00-E6
- %Windows%\Fonts\syn00-50-56-8E-00-E6\system
- %User Profile%\Microsoft\Dr Watson
(Note: %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.)
Other System Modifications
This file infector adds the following registry keys:
HKEY_LOCAL_MACHINE\SOFTWARE\GoogleBA
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
Logo_1.exe
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
Logo1_.exe
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
Navapw32.exe
It adds the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\GoogleBA
setup = "yes"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
Logo_1.exe
Debugger = "net"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
Logo1_.exe
Debugger = "net"
It modifies the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
DrWatson
NumberOfCrashes = "1"
(Note: The default value data of the said registry entry is 0.)
It deletes the following registry keys:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
PCHealth\ErrorReporting\DW
Dropping Routine
This file infector drops the following files:
- ani.ani
- %User Profile%\Dr Watson\drwtsn32.log
- %User Profile%\Dr Watson\user.dmp
- %Windows%\Fonts\syn00-50-56-8E-00-E6\system\smss.exe
(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.. %Windows% is the Windows folder, which is usually C:\Windows.)
This report is generated via an automated analysis system.
SOLUTION
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_LOCAL_MACHINE\SOFTWARE
- GoogleBA
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options
- Logo_1.exe
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options
- Logo1_.exe
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options
- Navapw32.exe
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_LOCAL_MACHINE\SOFTWARE\GoogleBA
- setup = "yes"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\Logo_1.exe
- Debugger = "net"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\Logo1_.exe
- Debugger = "net"
Step 4
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\SOFTWARE\Microsoft\DrWatson
- From: NumberOfCrashes = "1"
To: NumberOfCrashes = "0"
- From: NumberOfCrashes = "1"
Step 5
Search and delete these folders
- %Windows%\Fonts\syn00-50-56-8E-00-E6
- %Windows%\Fonts\syn00-50-56-8E-00-E6\system
- %User Profile%\Microsoft\Dr Watson
Step 6
Search and delete these components
- ani.ani
- %User Profile%\Dr Watson\drwtsn32.log
- %User Profile%\Dr Watson\user.dmp
- %Windows%\Fonts\syn00-50-56-8E-00-E6\system\smss.exe
Step 7
Scan your computer with your Trend Micro product to clean files detected as PE_CEKAR.SM2. 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 8
Restore these deleted registry keys/values from backup
*Note: Only Microsoft-related keys/values will be restored. If the malware/grayware also deleted registry keys/values related to programs that are not from Microsoft, please reinstall those programs on your computer.
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\PCHealth\ErrorReporting
- DW
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