TROJ_INJECTO.AJM
Windows 2000, Windows XP, Windows Server 2003
Threat Type: Trojan
Destructiveness: No
Encrypted: No
In the wild: Yes
OVERVIEW
Downloaded from the Internet, Dropped by other malware
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
61,799 bytes
EXE
Yes
24 Aug 2012
Connects to URLs/IPs
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 Startup%\updates.exe
- %Application Data%\updates\updates.exe
(Note: %User Startup% is the current user's Startup folder, which is usually C:\Windows\Profiles\{user name}\Start Menu\Programs\Startup on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Start Menu\Programs\Startup on Windows NT, and C:\Documents and Settings\{User name}\Start Menu\Programs\Startup.. %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming on Windows Vista and 7.)
It creates the following folders:
- %Application Data%\updates
(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming on Windows Vista and 7.)
Autostart Technique
This Trojan adds the following registry entries to enable its automatic execution at every system startup:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
engel = "%Application Data%\updates\updates.exe"
Other System Modifications
This Trojan adds the following registry entries as part of its installation routine:
HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Main
DHCP = "1942370"
HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Main
DNS =
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
Associations
LowRiskFileTypes = ".exe"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Tracing\FWCFG
EnableFileTracing = 0
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Tracing\FWCFG
EnableConsoleTracing = 0
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Tracing\FWCFG
FileTracingMask = ffff0000
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Tracing\FWCFG
ConsoleTracingMask = ffff0000
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Tracing\FWCFG
MaxFileSize = 00100000
It modifies the following registry key(s)/entry(ies) as part of its installation routine:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Netlogon\Private
SocketAddressList = {Blank}
(Note: The default value data of the said registry entry is {User Defined}.)
It adds the following registry keys as part of its installation routine:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Tcpip\Parameters\
DNSRegisteredAdapters\{20A5AFB8-0B46-48F8-B005-BF2A8A82574A}
It creates the following registry entry(ies) to bypass Windows Firewall:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile
EnableFirewall = 0
NOTES:
This Trojan generates random domains and connects to generated domains on TCP ports 3128 and 6667 to send and receive information.
SOLUTION
9.200
9.346.05
24 Aug 2012
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
Terminate a malware/grayware process
*Note: If the detected process is not displayed in theWindows Task Manager, continue doing the next steps.
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_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- engel = "%Application Data%\updates\updates.exe"
- engel = "%Application Data%\updates\updates.exe"
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main
- DHCP = "1942370"
- DHCP = "1942370"
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main
- DNS
- DNS
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Associations
- LowRiskFileTypes = ".exe"
- LowRiskFileTypes = ".exe"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Tracing\FWCFG
- EnableFileTracing = 0
- EnableFileTracing = 0
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Tracing\FWCFG
- EnableConsoleTracing = 0
- EnableConsoleTracing = 0
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Tracing\FWCFG
- FileTracingMask = ffff0000
- FileTracingMask = ffff0000
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Tracing\FWCFG
- ConsoleTracingMask = ffff0000
- ConsoleTracingMask = ffff0000
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Tracing\FWCFG
- MaxFileSize = 00100000
- MaxFileSize = 00100000
- In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile
- EnableFirewall = 0
- EnableFirewall = 0
Step 4
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. Before you could do this, you must restart in Safe Mode. For instructions on how to do this, you may refer to this page If the preceding step requires you to restart in safe mode, you may proceed to edit the system registry.
- In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\DNSRegisteredAdapters
- {20A5AFB8-0B46-48F8-B005-BF2A8A82574A}
- {20A5AFB8-0B46-48F8-B005-BF2A8A82574A}
Step 5
Restore this modified 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\SYSTEM\CurrentControlSet\Services\Netlogon\Private
- From: SocketAddressList = {Blank}
To: SocketAddressList = {User Defined}
- From: SocketAddressList = {Blank}
Step 6
Search and delete these folders
- %Application Data%\updates
Step 7
Scan your computer with your Trend Micro product to delete files detected as TROJ_INJECTO.AJM. 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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