TROJ_DLOADR.YJF
Trojan:Win32/Danginex (Microsoft); Downloader.a!kg (McAfee); Downloader (Symantec); PAK:UPX (Kaspersky); Trojan.Win32.Generic!BT (Sunbelt); Trojan.Generic.6927725 (FSecure)
Windows 2000, Windows XP, Windows Server 2003
![](/vinfo/imgFiles/legend.jpg)
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
134,404 bytes
EXE
Yes
07 Apr 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:
- %Program Files%\iStarNews
- %Program Files%\iStarNews\update
(Note: %Program Files% is the default Program Files folder, usually C:\Program Files.)
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
istarnews = "%Program Files%\iStarNews\istarnewsup.exe"
Other System Modifications
This Trojan adds the following registry keys:
HKEY_CURRENT_USER\SOFTWARE\istarnews
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
iStarNews_is1
It adds the following registry entries:
HKEY_CURRENT_USER\Software\istarnews
part = "bUMvOBF="
HKEY_CURRENT_USER\Software\istarnews
ver = "20101206.1"
HKEY_CURRENT_USER\Software\istarnews
today = "10/2/2011"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
iStarNews_is1
DisplayIcon = "%Program Files%\iStarNews\istarnewsdel.exe"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
iStarNews_is1
DisplayName = "Media Newssuppot Enter(t)"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
iStarNews_is1
DisplayVersion = "1.0"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
iStarNews_is1
UninstallString = "%Program Files%\iStarNews\istarnewsdel.exe"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
iStarNews_is1
URLInfoAbout = "http://{BLOCKED}starnews.net"
Dropping Routine
This Trojan drops the following files:
- %Program Files%\iStarNews\istarnewsup.exe
- %Program Files%\iStarNews\update\istarnewsdel.exe
- %Program Files%\iStarNews\update\istarnewsup.exe
- %Program Files%\iStarNews\update\istarnews.exe
- %Program Files%\iStarNews\isn.dat
(Note: %Program Files% is the default Program Files folder, usually C:\Program Files.)
Other Details
This Trojan connects to the following possibly malicious URL:
- http://{BLOCKED}starnews.net/program/istarnewsup.exe
- http://{BLOCKED}starnews.net/program/istarnewsdel.exe
- http://{BLOCKED}starnews.net/program/istarnews.exe
This report is generated via an automated analysis system.
SOLUTION
9.200
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
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
- istarnews
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall
- iStarNews_is1
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_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- istarnews = "%Program Files%\iStarNews\istarnewsup.exe"
- In HKEY_CURRENT_USER\Software\istarnews
- part = "bUMvOBF="
- In HKEY_CURRENT_USER\Software\istarnews
- ver = "20101206.1"
- In HKEY_CURRENT_USER\Software\istarnews
- today = "10/2/2011"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\iStarNews_is1
- DisplayIcon = "%Program Files%\iStarNews\istarnewsdel.exe"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\iStarNews_is1
- DisplayName = "Media Newssuppot Enter(t)"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\iStarNews_is1
- DisplayVersion = "1.0"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\iStarNews_is1
- UninstallString = "%Program Files%\iStarNews\istarnewsdel.exe"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\iStarNews_is1
- URLInfoAbout = "http://{BLOCKED}starnews.net"
Step 5
Search and delete these files
- %Program Files%\iStarNews\istarnewsup.exe
- %Program Files%\iStarNews\update\istarnewsdel.exe
- %Program Files%\iStarNews\update\istarnewsup.exe
- %Program Files%\iStarNews\update\istarnews.exe
- %Program Files%\iStarNews\isn.dat
Step 6
Search and delete these folders
- %Program Files%\iStarNews
- %Program Files%\iStarNews\update
Step 7
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_DLOADR.YJF. 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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