TROJ_INJECTO.YYE
Trojan:Win32/Peaac.gen!A (Microsoft); Ransom-FLR!AF0E1589FD73 (McAfee); Trojan.Gen (Symantec); P2P-Worm.Win32.Palevo.hoqq (Kaspersky); Troj/Agent-AIEA (Sophos); Trojan.Win32.Cutwail.zz (v) (Sunbelt); Trojan horse SHeur4.BZIV (AVG)
Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)
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 drops the following copies of itself into the affected system:
- %User Profile%\Update\MSupdate.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.)
It creates the following folders:
- %User Profile%\Application Data\Update
- %System Root%\RECYCLER
(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.)
Autostart Technique
This Trojan adds the following registry entries to enable its automatic execution at every system startup:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Winlogon
Taskman = "%User Profile%\Update\MSupdate.exe"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
Windows Update Manager = "%User Profile%\Update\MSupdate.exe"
Other System Modifications
This Trojan deletes the following files:
- %User Profile%\Update\MSupdate.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.)
It adds the following registry entries:
HKEY_CURRENT_USER\Software\Microsoft\
Windows NT\CurrentVersion\Winlogon
Shell = "explorer.exe,%User Profile%\Update\MSupdate.exe"
Other Details
This Trojan connects to the following possibly malicious URL:
- {BLOCKED}.139.4
- {BLOCKED}.232.199
- {BLOCKED}.162.131
- {BLOCKED}.140.103
- {BLOCKED}106.232
- {BLOCKED}106.226
- {BLOCKED}.7.2
- {BLOCKED}0
- {BLOCKED}.93.234
- {BLOCKED}.171.103
- {BLOCKED}3.4.47
- {BLOCKED}8.93.133
- {BLOCKED}.54.77
- {BLOCKED}.118.37
- {BLOCKED}66.85
- {BLOCKED}8.14.11
- {BLOCKED}236.79
- {BLOCKED}.216.25
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
Identify and delete files detected as TROJ_INJECTO.YYE using either the Startup Disk or Recovery Console
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 NT\CurrentVersion\Winlogon
- Taskman = "%User Profile%\Update\MSupdate.exe"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- Windows Update Manager = "%User Profile%\Update\MSupdate.exe"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows NT\CurrentVersion\Winlogon
- Shell = "explorer.exe,%User Profile%\Update\MSupdate.exe"
Step 4
Search and delete these folders
- %User Profile%\Application Data\Update
- %System Root%\RECYCLER
Step 5
Scan your computer with your Trend Micro product to delete files detected as TROJ_INJECTO.YYE. 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.
- %User Profile%\Update\MSupdate.exe
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