TROJ_DLOADR.USBC30AVC
TrojanDownloader:Win32/Fosniw.C (Microsoft); Trojan.Gen (Symantec); Trojan.Win32.Scar.eahs (Kaspersky); Trojan-Downloader.Win32.Fosniw.c (v) (Sunbelt); Gen:Trojan.Heur.JP.pm0@aOvypfiG (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
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.
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
1f131d0f1e010258130e13 = "%User Profile%\Application Data\yhwt.exe"
Other System Modifications
This Trojan deletes the following files:
- %User Profile%\Application Data\yhwt.exe
- %Windows%\fonts\msgothic.ttf
- %Windows%\fonts\msuigoth.ttf
- %Windows%\fonts\MSMINCHO.TTF
- %Windows%\fonts\Gulim.ttf
- %Windows%\fonts\Gulimche.ttf
- %Windows%\fonts\Dotum.ttf
- %Windows%\fonts\Batang.ttf
- %Windows%\fonts\Gungsuh.ttf
- %Windows%\fonts\Simsun.ttf
- %Windows%\fonts\nsimsun.ttf
- %Windows%\fonts\MingLiU.ttf
- %Windows%\fonts\pmingliu.ttf
- %System%\SET2.tmp
- %System%\kbd101b.dll
- %System%\SET4.tmp
- %System%\kbd101c.dll
- %System%\SET6.tmp
- %System%\kbd103.dll
- %System%\SET8.tmp
- %System%\kbd106.dll
- %System%\SETA.tmp
- %System%\kbdjpn.dll
- %System%\SETC.tmp
- %System%\kbdkor.dll
(Note: %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.. %Windows% is the Windows folder, which is usually C:\Windows or C:\WINNT.. %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.)
It adds the following registry keys:
HKEY_CURRENT_USER\Software\673731e967b1
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
yhwt
HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\International\CpMRU
It adds the following registry entries:
HKEY_CURRENT_USER\Software\673731e967b1
idt = "201204271228"
HKEY_CURRENT_USER\Software\673731e967b1
ver = "1.0.0.6"
HKEY_CURRENT_USER\Software\673731e967b1
Location = "1f131d0f1e010258130e13"
HKEY_CURRENT_USER\Software\673731e967b1
pid = "trb1"
HKEY_CURRENT_USER\Software\673731e967b1
prj = "4"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
yhwt
DisplayName = "Windows IEK yhwt Uninstall"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
yhwt
UninstallString = "%User Profile%\Application Data\yhwt.exe uninstall"
HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\International\CpMRU
Enable = "1"
HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\International\CpMRU
Size = "a"
HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\International\CpMRU
InitHits = "64"
HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\International\CpMRU
Factor = "14"
HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\International
W2KLpk = "1"
HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\International
W2KLpk = "0"
Dropping Routine
This Trojan drops the following files:
- %System%\SET1.tmp
- %System%\SET3.tmp
- %System%\SET5.tmp
- %System%\SET7.tmp
- %System%\SET9.tmp
- %System%\SETB.tmp
- %System%\SET2.tmp
- %System%\SET4.tmp
- %System%\SET6.tmp
- %System%\SET8.tmp
- %System%\SETA.tmp
- %System%\SETC.tmp
(Note: %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.)
This report is generated via an automated analysis system.
SOLUTION
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
- 673731e967b1
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall
- yhwt
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\International
- CpMRU
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
- 1f131d0f1e010258130e13 = "%User Profile%\Application Data\yhwt.exe"
- In HKEY_CURRENT_USER\Software\673731e967b1
- idt = "201204271228"
- In HKEY_CURRENT_USER\Software\673731e967b1
- ver = "1.0.0.6"
- In HKEY_CURRENT_USER\Software\673731e967b1
- Location = "1f131d0f1e010258130e13"
- In HKEY_CURRENT_USER\Software\673731e967b1
- pid = "trb1"
- In HKEY_CURRENT_USER\Software\673731e967b1
- prj = "4"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\yhwt
- DisplayName = "Windows IEK yhwt Uninstall"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\yhwt
- UninstallString = "%User Profile%\Application Data\yhwt.exe uninstall"
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\International\CpMRU
- Enable = "1"
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\International\CpMRU
- Size = "a"
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\International\CpMRU
- InitHits = "64"
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\International\CpMRU
- Factor = "14"
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\International
- W2KLpk = "1"
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\International
- W2KLpk = "0"
Step 5
Search and delete these files
- %System%\SET1.tmp
- %System%\SET3.tmp
- %System%\SET5.tmp
- %System%\SET7.tmp
- %System%\SET9.tmp
- %System%\SETB.tmp
- %System%\SET2.tmp
- %System%\SET4.tmp
- %System%\SET6.tmp
- %System%\SET8.tmp
- %System%\SETA.tmp
- %System%\SETC.tmp
Step 6
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_DLOADR.USBC30AVC. 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 7
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\yhwt.exe
- %Windows%\fonts\msgothic.ttf
- %Windows%\fonts\msuigoth.ttf
- %Windows%\fonts\MSMINCHO.TTF
- %Windows%\fonts\Gulim.ttf
- %Windows%\fonts\Gulimche.ttf
- %Windows%\fonts\Dotum.ttf
- %Windows%\fonts\Batang.ttf
- %Windows%\fonts\Gungsuh.ttf
- %Windows%\fonts\Simsun.ttf
- %Windows%\fonts\nsimsun.ttf
- %Windows%\fonts\MingLiU.ttf
- %Windows%\fonts\pmingliu.ttf
- %System%\SET2.tmp
- %System%\kbd101b.dll
- %System%\SET4.tmp
- %System%\kbd101c.dll
- %System%\SET6.tmp
- %System%\kbd103.dll
- %System%\SET8.tmp
- %System%\kbd106.dll
- %System%\SETA.tmp
- %System%\kbdjpn.dll
- %System%\SETC.tmp
- %System%\kbdkor.dll
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