Backdoor.Win32.NETWIRED.FAJ
RDN/Generic BackDoor (McAfee); HEUR:Backdoor.Win32.NetWiredRC.gen (Kaspersky); Trojan.Win32.Generic!BT (Sunbelt)
Windows
Threat Type: Backdoor
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
This Backdoor 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 Backdoor 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 Backdoor creates the following folders:
- %User Temp%\shipped\vbscript
- %User Temp%\generic\em
- %System Root%\Users
- %User Temp%\generic
- %User Temp%\shipped
- %User Temp%\_images
- %User Profile%\AppData
(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(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local\Temp on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).. %System Root% is the Windows root folder, where it usually is C:\ on all Windows operating system versions.. %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name} on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)
Other System Modifications
This Backdoor modifies the following file(s):
- %Windows%\win.ini
(Note: %Windows% is the Windows folder, where it usually is C:\Windows on all Windows operating system versions.)
Dropping Routine
This Backdoor drops the following files:
- %User Temp%\_images\iconv.m4
- %User Temp%\_images\vsslnui.dll
- %User Temp%\shipped\vbscript\am.ctb
- %User Temp%\generic\em\x-minolta-mrw.xml
- %User Temp%\generic\em\libX11-xcb.so.1
- %User Temp%\shipped\vbscript\240-8,8.gif
- %User Temp%\_images\freq.h
- %User Temp%\shipped\vbscript\mathml+xml.xml
- %User Temp%\shipped\vbscript\RapiConfig.exe
- %User Temp%\_images\iso88592.pyc
- %User Temp%\shipped\vbscript\SecUtil.exe
- %User Temp%\independence.dll
- %User Temp%\shipped\vbscript\dexplore.exe
- %User Temp%\generic\em\makecert.exe
- %User Temp%\_images\bnx2x-e1-7.2.51.0
- %User Temp%\Dioptre
- %User Temp%\_images\htmlTable.xml
- %User Temp%\_images\Component-Cube04-Orange.svg
- %User Temp%\_images\libusb-1.0-0amd64.list
- %User Temp%\generic\em\Parse-DebianChangelog-Pod.mo
- %User Temp%\_images\8.opends60.dll
- %User Temp%\shipped\vbscript\enukbexcel2003.hxc
- %User Temp%\shipped\vbscript\sqladd10alinks.hxk
- %User Temp%\_images\combar.gif
- %User Temp%\_images\pos0.gif
- %User Temp%\shipped\vbscript\pagepanenosel.xml
- %User Temp%\_images\lregdll.dll
(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(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local\Temp on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)
This report is generated via an automated analysis system.
SOLUTION
Step 1
Before doing any scans, Windows 7, Windows 8, Windows 8.1, and Windows 10 users must disable System Restore to allow full scanning of their computers.
Step 2
Search and delete these components
- %User Temp%\_images\iconv.m4
- %User Temp%\_images\vsslnui.dll
- %User Temp%\shipped\vbscript\am.ctb
- %User Temp%\generic\em\x-minolta-mrw.xml
- %User Temp%\generic\em\libX11-xcb.so.1
- %User Temp%\shipped\vbscript\240-8,8.gif
- %User Temp%\_images\freq.h
- %User Temp%\shipped\vbscript\mathml+xml.xml
- %User Temp%\shipped\vbscript\RapiConfig.exe
- %User Temp%\_images\iso88592.pyc
- %User Temp%\shipped\vbscript\SecUtil.exe
- %User Temp%\independence.dll
- %User Temp%\shipped\vbscript\dexplore.exe
- %User Temp%\generic\em\makecert.exe
- %User Temp%\_images\bnx2x-e1-7.2.51.0
- %User Temp%\Dioptre
- %User Temp%\_images\htmlTable.xml
- %User Temp%\_images\Component-Cube04-Orange.svg
- %User Temp%\_images\libusb-1.0-0amd64.list
- %User Temp%\generic\em\Parse-DebianChangelog-Pod.mo
- %User Temp%\_images\8.opends60.dll
- %User Temp%\shipped\vbscript\enukbexcel2003.hxc
- %User Temp%\shipped\vbscript\sqladd10alinks.hxk
- %User Temp%\_images\combar.gif
- %User Temp%\_images\pos0.gif
- %User Temp%\shipped\vbscript\pagepanenosel.xml
- %User Temp%\_images\lregdll.dll
Step 3
Search and delete these folders
- %User Temp%\shipped\vbscript
- %User Temp%\generic\em
- %System Root%\Users
- %User Temp%\generic
- %User Temp%\shipped
- %User Temp%\_images
- %User Profile%\AppData
Step 4
Scan your computer with your Trend Micro product to delete files detected as Backdoor.Win32.NETWIRED.FAJ. 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 the following Trend Micro Support pages for more information:
Step 5
Restore deleted/modified files and/or registry entries from backup
*Note: Only Microsoft-related files/keys/values will be restored. If this malware/grayware also deleted registry keys/values related to programs that are not from Microsoft, please reinstall those programs on your computer.
- %Windows%\win.ini
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