TROJ_ADLOAD.KA
[2.nsis]:Downloader-CBG, [4.nsis]:Generic StartPage!da (McAfee); Downloader (Symantec); ARC:NSIS, [$INSTDIR\info_yx5.exe]:Trojan-Downloader.Win32.Adload.noq, [$SYSDIR\Servicx.exe]:Trojan.W (Kaspersky); Trojan.Win32.Generic.pak!cobra (Sunbelt); Trojan.Generic.IS.436127 (FSecure)
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
620,232 bytes
EXE
No
22 Oct 2012
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%\DOCUME~1
- %System Root%\DOCUME~1\ADMINI~1
- %User Profile%\LOCALS~1
- %User Temp%\nsu2.tmp
(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.. %User Profile% is the current user's profile folder, which is usually C:\Windows\Profiles\{user name} on Windows 98 and ME, C:\WINNT\Profiles\{user name} on Windows NT, and C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003.. %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003.)
Other System Modifications
This Trojan deletes the following files:
- %User Temp%\nsu1.tmp
- %User Temp%\nsu2.tmp
(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003.)
It adds the following registry keys:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
System
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Advanced INF Setup\strLink
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Advanced INF Setup\appTitle
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Advanced INF Setup\proRunNum
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Advanced INF Setup\proFirstTime
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Advanced INF Setup\proLastTime
HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Main\Software\
Microsoft\Internet Explorer\Main
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{871C5380-42A0-1069-A2EA-08002B30309D}\shell\
open
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{871C5380-42A0-1069-A2EA-08002B30309D}\shell\
open\Command
It adds the following registry entries:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
System
Shell = "%Windows%\Explorer.exe %System%\tlntsvi_2681.exe"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Advanced INF Setup
strLink = "yx5"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Advanced INF Setup
appTitle = "yx5"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Advanced INF Setup
proRunNum = "1"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Advanced INF Setup
proFirstTime = "{random values}"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Advanced INF Setup
proLastTime = "{random values}"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Advanced INF Setup
pageID = "0"
HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Main\Software\
Microsoft\Internet Explorer\Main
Start Page = "http://www.{BLOCKED}5.com/?yx5"
It modifies the following registry entries:
HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Main
Start Page = "http://www.{BLOCKED}5.com/?yx5"
(Note: The default value data of the said registry entry is http://www.microsoft.com/isapi/redir.dll?prd=ie&pver=6&ar=msnhome.)
It deletes the following registry keys:
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{871C5380-42A0-1069-A2EA-08002B30309D}\shell\
OpenHomePage\Command
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{871C5380-42A0-1069-A2EA-08002B30309D}\shell\
OpenHomePage
Dropping Routine
This Trojan drops the following files:
- %User Temp%\nsu2.tmp\System.dll
- %User Temp%\info_yx5.exe
- %System%\tlntsvi.exe
- %User Temp%\nsu2.tmp\SimpleSC.dll
- %System%\Servicx.exe
- %System%\com\comadmine.dll
- %User Temp%\nsu2.tmp\nsRandom.dll
- %User Temp%\nsu2.tmp\InetLoad.dll
- %Desktop%\Internet Explorer.lnk
- %User Profile%\Quick Launch\Launch Internet Explorer Browser.lnk
- %User Profile%\Quick Launch\Æô¶¯ Internet Explorer ä¯ÀÀÆ÷.lnk
(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003.. %System% is the Windows system folder, which is usually C:\Windows\System on Windows 98 and ME, C:\WINNT\System32 on Windows NT and 2000, or C:\Windows\System32 on Windows XP and Server 2003.. %Desktop% is the current user's desktop, which is usually C:\Windows\Profiles\{user name}\Desktop on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Desktop on Windows NT, and C:\Documents and Settings\{User Name}\Desktop on Windows 2000, XP, and Server 2003.. %User Profile% is the current user's profile folder, which is usually C:\Windows\Profiles\{user name} on Windows 98 and ME, C:\WINNT\Profiles\{user name} on Windows NT, and C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003.)
This report is generated via an automated analysis system.
SOLUTION
9.300
Step 1
For Windows XP and Windows Server 2003 users, before doing any scans, please make sure you disable System Restore to allow full scanning of your computer.
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_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies
- System
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Advanced INF Setup
- strLink
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Advanced INF Setup
- appTitle
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Advanced INF Setup
- proRunNum
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Advanced INF Setup
- proFirstTime
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Advanced INF Setup
- proLastTime
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Software\Microsoft\Internet Explorer
- Main
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{871C5380-42A0-1069-A2EA-08002B30309D}\shell
- open
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{871C5380-42A0-1069-A2EA-08002B30309D}\shell\open
- Command
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\Policies\System
- Shell = "%Windows%\Explorer.exe %System%\tlntsvi_2681.exe"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Advanced INF Setup
- strLink = "yx5"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Advanced INF Setup
- appTitle = "yx5"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Advanced INF Setup
- proRunNum = "1"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Advanced INF Setup
- proFirstTime = "{random values}"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Advanced INF Setup
- proLastTime = "{random values}"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Advanced INF Setup
- pageID = "0"
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main\Software\Microsoft\Internet Explorer\Main
- Start Page = "http://www.{BLOCKED}5.com/?yx5"
Step 4
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_CURRENT_USER\Software\Microsoft\Internet Explorer\Main
- From: Start Page = "http://www.{BLOCKED}5.com/?yx5"
To: Start Page = ""http://www.microsoft.com/isapi/redir.dll?prd=ie&pver=6&ar=msnhome""
- From: Start Page = "http://www.{BLOCKED}5.com/?yx5"
Step 5
Search and delete these files
- %User Temp%\nsu2.tmp\System.dll
- %User Temp%\info_yx5.exe
- %System%\tlntsvi.exe
- %User Temp%\nsu2.tmp\SimpleSC.dll
- %System%\Servicx.exe
- %System%\com\comadmine.dll
- %User Temp%\nsu2.tmp\nsRandom.dll
- %User Temp%\nsu2.tmp\InetLoad.dll
- %Desktop%\Internet Explorer.lnk
- %User Profile%\Quick Launch\Launch Internet Explorer Browser.lnk
- %User Profile%\Quick Launch\Æô¶¯ Internet Explorer ä¯ÀÀÆ÷.lnk
Step 6
Search and delete these folders
- %System Root%\DOCUME~1
- %System Root%\DOCUME~1\ADMINI~1
- %User Profile%\LOCALS~1
- %User Temp%\nsu2.tmp
Step 7
Scan your computer with your Trend Micro product to delete files detected as TROJ_ADLOAD.KA. 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 Temp%\nsu1.tmp
- %User Temp%\nsu2.tmp
Step 9
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\Classes\CLSID\{871C5380-42A0-1069-A2EA-08002B30309D}\shell\OpenHomePage
- Command
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{871C5380-42A0-1069-A2EA-08002B30309D}\shell
- OpenHomePage
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