TROJ_CUTOLOMO.A
Windows 2000, Windows XP, Windows Server 2003
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
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 creates the following folders:
- %System Root%\IntelNewz
- %System Root%\IntelNewz\47603
(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)
Autostart Technique
This Trojan adds the following registry entries to enable its automatic execution at every system startup:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
netupdateAdb = "%User Profile%\Application Data\Smart Player Installer.exe "
Other System Modifications
This Trojan deletes the following files:
- %User Profile%\Application Data\Smart Player Installer.exe
- %Program Files%\Google\Update\GoogleUpdate.exe
- %Program Files% (x86)\Google\Update\GoogleUpdate.exe
- %System%\Tasks\GoogleUpdateTaskMachineCore
- %System%\Tasks\GoogleUpdateTaskMachineUA
(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.. %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000, Server 2003, and XP (32-bit), Vista (32-bit), and 7 (32-bit), or C:\Program Files (x86) in Windows XP (64-bit), Vista (64-bit), and 7 (64-bit).. %System% is the Windows system folder, which is usually C:\Windows\System32.)
It adds the following registry keys:
HKEY_CURRENT_USER\Software\Reader
It adds the following registry entries:
HKEY_CURRENT_USER\Software\Reader
RandomString = "47603"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\policies\
system
EnableLUA = "0"
HKEY_CURRENT_USER\Software\Reader
doUpdate = "1"
Dropping Routine
This Trojan drops the following files:
- %User Profile%\Application Data\LinkList.txt
- %System Root%\IntelNewz\47603\background.js
- %System Root%\IntelNewz\47603\icon.png
- %System Root%\IntelNewz\47603\jquery-1.9.1.min.js
- %System Root%\IntelNewz\47603\manifest.json
- %System Root%\IntelNewz\47603\script.js
(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.. %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)
Other Details
This Trojan connects to the following possibly malicious URL:
- http://www.{BLOCKED}f.biz/ask.txt
- http://www.{BLOCKED}f.biz/ajax/background.js
- http://www.{BLOCKED}f.biz/ajax/icon.png
- http://www.{BLOCKED}f.biz/ajax/jquery-1.9.1.min.js
- http://www.{BLOCKED}f.biz/ajax/manifest.json
- http://www.{BLOCKED}f.biz/ajax/script.js
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
Restart in Safe Mode
Step 3
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
- Reader
Step 4
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
- netupdateAdb = "%User Profile%\Application Data\Smart Player Installer.exe "
- In HKEY_CURRENT_USER\Software\Reader
- RandomString = "47603"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\system
- EnableLUA = "0"
- In HKEY_CURRENT_USER\Software\Reader
- doUpdate = "1"
Step 5
Search and delete these components
- %User Profile%\Application Data\LinkList.txt
- %System Root%\IntelNewz\47603\background.js
- %System Root%\IntelNewz\47603\icon.png
- %System Root%\IntelNewz\47603\jquery-1.9.1.min.js
- %System Root%\IntelNewz\47603\manifest.json
- %System Root%\IntelNewz\47603\script.js
Step 6
Search and delete these folders
- %System Root%\IntelNewz
- %System Root%\IntelNewz\47603
Step 7
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_CUTOLOMO.A. 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 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.
- %User Profile%\Application Data\Smart Player Installer.exe
- %Program Files%\Google\Update\GoogleUpdate.exe
- %Program Files% (x86)\Google\Update\GoogleUpdate.exe
- %System%\Tasks\GoogleUpdateTaskMachineCore
- %System%\Tasks\GoogleUpdateTaskMachineUA
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