Trojan.Win32.ARCBOMB.FSB

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.

File Size:

1,735,458 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

17 Apr 2020

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 adds the following processes:

%User Profile%\h7336i5356\jkikj.exe reabcurqnv.huh
"%Windows%\Microsoft.NET\Framework\v2.0.50727\vbc.exe" /stext "%User Temp%\tmp1AB0.tmp"
"%Windows%\Microsoft.NET\Framework\v2.0.50727\vbc.exe" /stext "%User Temp%\tmp3D4E.tmp"
%System%\lsass.exe

(Note: %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).. %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% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.)

It creates the following folders:

%User Profile%\temp
%System Root%\Users
%User Profile%\h7336i5356

(Note: %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).. %System Root% is the Windows root folder, where it usually is C:\ on all Windows operating system versions.)

Other System Modifications

This Trojan adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\Windows\CurrentVersion\
Run
winlogon.exe = "%User Profile%\H7336I~1\jkikj.exe %User Profile%\H7336I~1\REABCU~1.HUH"

Dropping Routine

This Trojan drops the following files:

%User Temp%\RegSvcs.exe
%User Profile%\h7336i5356\uxqachvd.cpl
%User Profile%\h7336i5356\bpqaw.mp3
%User Profile%\h7336i5356\clhxtpo.cpl
%User Profile%\h7336i5356\ausqawilc.pdf
%User Profile%\h7336i5356\iurroreu.ppt
%User Profile%\h7336i5356\vhspamewq.bmp
%User Profile%\h7336i5356\mwniwcurkp.dat
%User Profile%\h7336i5356\soocrmfl.jpg
%Application Data%\Mozilla\Firefox\Profiles\lj5mikyj.default\key4.db
%User Profile%\h7336i5356\glkdc.exe
%User Profile%\h7336i5356\reabcurqnv.huh
%User Profile%\h7336i5356\sswapgx.cpl
%User Profile%\h7336i5356\rjsjgskw.xls
%User Profile%\h7336i5356\wpoiaeujh.vbs
%User Temp%\{GUID}
%User Profile%\temp\mwniwcurkp.dat
%User Profile%\h7336i5356\fvkqul.ppt
%User Profile%\h7336i5356\sthbxtc.log
%User Profile%\h7336i5356\ehsf.jpg
%User Profile%\h7336i5356\ddvla.bin
%User Profile%\h7336i5356\ofeecidg.dat
%User Profile%\h7336i5356\vpfcm.docx
%User Profile%\h7336i5356\jitoqgdfit.txt
%User Profile%\h7336i5356\jkikj.exe
%User Profile%\h7336i5356\gchpm.dll
%User Profile%\h7336i5356\ibrhflt.txt
%User Profile%\h7336i5356\mvcwpuuw.ico
%User Profile%\h7336i5356\gicwvbadsa.mp3

(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).. %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).. %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Roaming 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.

Minimum Scan Engine:

9.850

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

Identify and terminate files detected as Trojan.Win32.ARCBOMB.FSB

[ Learn More ]

Windows Task Manager may not display all running processes. In this case, please use a third-party process viewer, preferably Process Explorer, to terminate the malware/grayware/spyware file. You may download the said tool here.
If the detected file is displayed in either Windows Task Manager or Process Explorer but you cannot delete it, restart your computer in safe mode. To do this, refer to this link for the complete steps.
If the detected file is not displayed in either Windows Task Manager or Process Explorer, continue doing the next steps.

Step 3

Delete this registry value

[ Learn More ]

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\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Run
- winlogon.exe = "%User Profile%\H7336I~1\jkikj.exe %User Profile%\H7336I~1\REABCU~1.HUH"

Step 4

Search and delete these components

[ Learn More ]

There may be some components that are hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the "More advanced options" option to include all hidden files and folders in the search result.

%User Temp%\RegSvcs.exe
%User Profile%\h7336i5356\uxqachvd.cpl
%User Profile%\h7336i5356\bpqaw.mp3
%User Profile%\h7336i5356\clhxtpo.cpl
%User Profile%\h7336i5356\ausqawilc.pdf
%User Profile%\h7336i5356\iurroreu.ppt
%User Profile%\h7336i5356\vhspamewq.bmp
%User Profile%\h7336i5356\mwniwcurkp.dat
%User Profile%\h7336i5356\soocrmfl.jpg
%Application Data%\Mozilla\Firefox\Profiles\lj5mikyj.default\key4.db
%User Profile%\h7336i5356\glkdc.exe
%User Profile%\h7336i5356\reabcurqnv.huh
%User Profile%\h7336i5356\sswapgx.cpl
%User Profile%\h7336i5356\rjsjgskw.xls
%User Profile%\h7336i5356\wpoiaeujh.vbs
%User Temp%\{GUID}
%User Profile%\temp\mwniwcurkp.dat
%User Profile%\h7336i5356\fvkqul.ppt
%User Profile%\h7336i5356\sthbxtc.log
%User Profile%\h7336i5356\ehsf.jpg
%User Profile%\h7336i5356\ddvla.bin
%User Profile%\h7336i5356\ofeecidg.dat
%User Profile%\h7336i5356\vpfcm.docx
%User Profile%\h7336i5356\jitoqgdfit.txt
%User Profile%\h7336i5356\jkikj.exe
%User Profile%\h7336i5356\gchpm.dll
%User Profile%\h7336i5356\ibrhflt.txt
%User Profile%\h7336i5356\mvcwpuuw.ico
%User Profile%\h7336i5356\gicwvbadsa.mp3

Step 5

Search and delete these folders

[ Learn More ]

Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden folders in the search result.

%User Profile%\temp
%System Root%\Users
%User Profile%\h7336i5356

Step 6

Scan your computer with your Trend Micro product to delete files detected as Trojan.Win32.ARCBOMB.FSB. 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:

Did this description help? Tell us how we did.

OVERVIEW

TECHNICAL DETAILS

SOLUTION

Resources

Support

About Trend

Country Headquarters