PE_TUFIK.C
Virus:Win32/Tufik.A (Microsoft); W32/Tufik.worm.gen (McAfee); W32.IRCBot (Symantec); Virus.Win32.Tufik.13945 (Kaspersky); Virus.Win32.Tufik.13945 (v) (Sunbelt); Trojan horse SHeur4.AVLG (AVG)
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
219,136 bytes
EXE
Yes
21 May 2013
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 drops the following copies of itself into the affected system:
- %User Profile%\Application Data\odjebiav2.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.)
Autostart Technique
This file infector adds the following registry entries to enable its automatic execution at every system startup:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
MS Svasta Pomalo v2 = "%User Profile%\Application Data\odjebiav2.exe"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
MS Svasta Pomalo v2 = "%User Profile%\Application Data\odjebiav2.exe"
Other System Modifications
This file infector modifies the following registry entries:
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Control\Session Manager\SFC
ProgramFilesDir = "%Program Files%"
(Note: The default value data of the said registry entry is %Program Files%.)
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Control\Session Manager\SFC
CommonFilesDir = "%Program Files%\Common Files"
(Note: The default value data of the said registry entry is %Program Files%\Common Files.)
Dropping Routine
This file infector drops the following files:
- %System Root%\explorer.exe
(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)
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
Restart in Safe Mode
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\Microsoft\Windows\CurrentVersion\Run
- MS Svasta Pomalo v2 = "%User Profile%\Application Data\odjebiav2.exe"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- MS Svasta Pomalo v2 = "%User Profile%\Application Data\odjebiav2.exe"
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\SYSTEM\ControlSet001\Control\Session Manager\SFC
- From: ProgramFilesDir = "%Program Files%"
To: ProgramFilesDir = ""%Program Files%""
- From: ProgramFilesDir = "%Program Files%"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\Session Manager\SFC
- From: CommonFilesDir = "%Program Files%\Common Files"
To: CommonFilesDir = ""%Program Files%\Common Files""
- From: CommonFilesDir = "%Program Files%\Common Files"
Step 5
Search and delete this file
- %System Root%\explorer.exe
Step 6
Restart in normal mode and scan your computer with your Trend Micro product for files detected as PE_TUFIK.C. 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.
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