Worm:Win32/Brontok.AS@mm

Posted: January 14, 2013

Threat Metric

The Threat Meter is a malware assessment that SpywareRemove.com's research team is able to give every identifiable malware threat. Our Threat Meter includes several criteria based off of specific malware threats to value their severity, reach and volume. The Threat Meter is able to give you a numerical breakdown of each threat's initial Threat Level, Detection Count, Volume Count, Trend Path and Percentage Impact. The overall ranking of each threat in the Threat Meter is a basic breakdown of how all threats are ranked within our own extensive malware database. The scoring for each specific malware threat can be easily compared to other emerging threats to draw a contrast in its particular severity. The Threat Meter is a useful tool in the endeavor of seeking a solution to remove a threat or pursue additional analytical research for all types of computer users.

The following fields listed on the Threat Meter containing a specific value, are explained in detail below:

Threat Level: The threat level scale goes from 1 to 10 where 10 is the highest level of severity and 1 is the lowest level of severity. Each specific level is relative to the threat's consistent assessed behaviors collected from SpyHunter's risk assessment model.

Detection Count: The collective number of confirmed and suspected cases of a particular malware threat. The detection count is calculated from infected PCs retrieved from diagnostic and scan log reports generated by SpyHunter.

Volume Count: Similar to the detection count, the Volume Count is specifically based on the number of confirmed and suspected threats infecting systems on a daily basis. High volume counts usually represent a popular threat but may or may not have infected a large number of systems. High detection count threats could lay dormant and have a low volume count. Criteria for Volume Count is relative to a daily detection count.

Trend Path: The Trend Path, utilizing an up arrow, down arrow or equal symbol, represents the level of recent movement of a particular threat. Up arrows represent an increase, down arrows represent a decline and the equal symbol represent no change to a threat's recent movement.

% Impact (Last 7 Days): This demonstrates a 7-day period change in the frequency of a malware threat infecting PCs. The percentage impact correlates directly to the current Trend Path to determine a rise or decline in the percentage.

Threat Level:	5/10
Infected PCs:	96

First Seen:	August 27, 2012
Last Seen:	July 7, 2020
OS(es) Affected:	Windows

Worm:Win32/Brontok.AS@mm is a mass-mailing email worm that changes certain computer settings, such as display of hidden files. Worm:Win32/Brontok.AS@mm also disables registry editing. Worm:Win32/Brontok.AS@mm circulates by sending a copy of itself, as an email attachment, to contacts existing on your computer. Worm:Win32/Brontok.AS@mm is also able to copy itself to USB, removable drives and shared folders. When installed on the compromised PC, Worm:Win32/Brontok.AS@mm makes system changes by dropping numerous potentially malicious files and making registry modifications. While being run, Worm:Win32/Brontok.AS@mm opens a Windows Explorer window to the "My Documents" folder. Worm:Win32/Brontok.AS@mm uses the Windows "new folder" icon for its copies. This may cause the file to occur as if it were a new folder rather than an executable file, attracting PC users into accidentally running Worm:Win32/Brontok.AS@mm. Worm:Win32/Brontok.AS@mm modifies the registry entries to assure that its copy runs automatically every time you start Windows.

Aliases

Win32/Brontok.worm.42579 [AhnLab-V3]Heuristic.BehavesLike.Win32.Suspicious-BAY.K [McAfee-GW-Edition]Worm/Brontok.QA [AntiVir]Worm.Win32.Brontok.CV [Comodo]W32/Brontok.CM@mm [F-Prot]W32/Brontok.N@mm [Fortinet]Win32/Brontok.worm.45568.E [AhnLab-V3]Win32/Robknot.CA [eTrust-Vet]Heuristic.LooksLike.Win32.Suspicious.F [McAfee-GW-Edition]TR/Crypt.CFI.Gen [AntiVir]Worm.Win32.Brontok.CS [Comodo]W32/Brontok-N [Sophos]Backdoor.Generic.199005 [BitDefender]Worm.Brontok.AI [ClamAV]Win32:Brontok-CE [Avast]
More aliases (71)

Technical Details

File System Modifications

Tutorials: If you wish to learn how to remove malware components manually, you can read the tutorials on how to find malware, kill unwanted processes, remove malicious DLLs and delete other harmful files. Always be sure to back up your PC before making any changes.

The following files were created in the system:

C:\autoexec.bat

File name: C:\autoexec.bat
File type: Batch file
Mime Type: unknown/bat
Group: Malware file

%APPDATA%\bronnpath0.txt

File name: %APPDATA%\bronnpath0.txt
Mime Type: unknown/txt
Group: Malware file

%APPDATA%\bronfoldnetdomlist.txt

File name: %APPDATA%\bronfoldnetdomlist.txt
Mime Type: unknown/txt
Group: Malware file

%APPDATA%\bronnetdomlist.bat

File name: %APPDATA%\bronnetdomlist.bat
File type: Batch file
Mime Type: unknown/bat
Group: Malware file

%APPDATA%\br7911on.exe

File name: %APPDATA%\br7911on.exe
File type: Executable File
Mime Type: unknown/exe
Group: Malware file

%APPDATA%\Bron.tok-9-10

File name: %APPDATA%\Bron.tok-9-10
Mime Type: unknown/tok-9-10
Group: Malware file

%APPDATA%\csrss.exe

File name: %APPDATA%\csrss.exe
File type: Executable File
Mime Type: unknown/exe
Group: Malware file

%APPDATA%\inetinfo.exe

File name: %APPDATA%\inetinfo.exe
File type: Executable File
Mime Type: unknown/exe
Group: Malware file

%APPDATA%\Kosong.Bron.Tok.txt

File name: %APPDATA%\Kosong.Bron.Tok.txt
Mime Type: unknown/txt
Group: Malware file

%APPDATA%\lsass.exe

File name: %APPDATA%\lsass.exe
File type: Executable File
Mime Type: unknown/exe
Group: Malware file

%APPDATA%\loc.mail.bron.tok

File name: %APPDATA%\loc.mail.bron.tok
Mime Type: unknown/tok
Group: Malware file

%APPDATA%\Ok-SendMail-Bron-tok

File name: %APPDATA%\Ok-SendMail-Bron-tok
Group: Malware file

%APPDATA%\svchost.exe

File name: %APPDATA%\svchost.exe
File type: Executable File
Mime Type: unknown/exe
Group: Malware file

%APPDATA%\smss.exe

File name: %APPDATA%\smss.exe
File type: Executable File
Mime Type: unknown/exe
Group: Malware file

%APPDATA%\services.exe

File name: %APPDATA%\services.exe
File type: Executable File
Mime Type: unknown/exe
Group: Malware file

%APPDATA%\winlogon.exe

File name: %APPDATA%\winlogon.exe
File type: Executable File
Mime Type: unknown/exe
Group: Malware file

%USERPROFILE%\Templates\Brengkolang.com

File name: %USERPROFILE%\Templates\Brengkolang.com
File type: Command, executable file
Mime Type: unknown/com
Group: Malware file

%USERPROFILE%\Templates\WowTumpeh.com

File name: %USERPROFILE%\Templates\WowTumpeh.com
File type: Command, executable file
Mime Type: unknown/com
Group: Malware file

%USERPROFILE%\Templates\14004-nendangbro.com

File name: %USERPROFILE%\Templates\14004-nendangbro.com
File type: Command, executable file
Mime Type: unknown/com
Group: Malware file

%USERPROFILE%\My Documents\My Pictures\about.Brontok.A.html - contains the body of the email it sends out

File name: %USERPROFILE%\My Documents\My Pictures\about.Brontok.A.html - contains the body of the email it sends out
Mime Type: unknown/html - contains the body of the email it sends out
Group: Malware file

%USERPROFILE%\Start Menu\Programs\Startup\empty.pif

File name: %USERPROFILE%\Start Menu\Programs\Startup\empty.pif
Mime Type: unknown/pif
Group: Malware file

%windir%\eksplorasi.pif

File name: %windir%\eksplorasi.pif
Mime Type: unknown/pif
Group: Malware file

%windir%\eksplorasi.exe

File name: %windir%\eksplorasi.exe
File type: Executable File
Mime Type: unknown/exe
Group: Malware file

%windir%\berasjatah.exe

File name: %windir%\berasjatah.exe
File type: Executable File
Mime Type: unknown/exe
Group: Malware file

%windir%\sembako-dezjlph.exe

File name: %windir%\sembako-dezjlph.exe
File type: Executable File
Mime Type: unknown/exe
Group: Malware file

%windir%\sembako-dfzjlog.exe

File name: %windir%\sembako-dfzjlog.exe
File type: Executable File
Mime Type: unknown/exe
Group: Malware file

%windir%\sembako-cmzjlji.exe

File name: %windir%\sembako-cmzjlji.exe
File type: Executable File
Mime Type: unknown/exe
Group: Malware file

%windir%\sembako-cnzjlpi.exe

File name: %windir%\sembako-cnzjlpi.exe
File type: Executable File
Mime Type: unknown/exe
Group: Malware file

%windir%\sembako-cmzjkji.exe

File name: %windir%\sembako-cmzjkji.exe
File type: Executable File
Mime Type: unknown/exe
Group: Malware file

%windir%\sembako-cmzjlii.exe

File name: %windir%\sembako-cmzjlii.exe
File type: Executable File
Mime Type: unknown/exe
Group: Malware file

%windir%\shellnew\bbm-somljimc.exe

File name: %windir%\shellnew\bbm-somljimc.exe
File type: Executable File
Mime Type: unknown/exe
Group: Malware file

%windir%\shellnew\bbm-toslphed.exe

File name: %windir%\shellnew\bbm-toslphed.exe
File type: Executable File
Mime Type: unknown/exe
Group: Malware file

%windir%\shellnew\bbm-qotlpinc.exe

File name: %windir%\shellnew\bbm-qotlpinc.exe
File type: Executable File
Mime Type: unknown/exe
Group: Malware file

%windir%\shellnew\bbm-rpqlogfd.exe

File name: %windir%\shellnew\bbm-rpqlogfd.exe
File type: Executable File
Mime Type: unknown/exe
Group: Malware file

%windir%\shellnew\bbm-vrqliimc.exe

File name: %windir%\shellnew\bbm-vrqliimc.exe
File type: Executable File
Mime Type: unknown/exe
Group: Malware file

%windir%\shellnew\bbm-xomljimc.exe

File name: %windir%\shellnew\bbm-xomljimc.exe
File type: Executable File
Mime Type: unknown/exe
Group: Malware file

%windir%\shellnew\bbm-trqliimc.exe

File name: %windir%\shellnew\bbm-trqliimc.exe
File type: Executable File
Mime Type: unknown/exe
Group: Malware file

%windir%\shellnew\bbm-vqslphed.exe

File name: %windir%\shellnew\bbm-vqslphed.exe
File type: Executable File
Mime Type: unknown/exe
Group: Malware file

%windir%\shellnew\bbm-zomljimc.exe

File name: %windir%\shellnew\bbm-zomljimc.exe
File type: Executable File
Mime Type: unknown/exe
Group: Malware file

%windir%\shellnew\bbm-xtvkjimc.exe

File name: %windir%\shellnew\bbm-xtvkjimc.exe
File type: Executable File
Mime Type: unknown/exe
Group: Malware file

%windir%\shellnew\bbm-yomljimc.exe

File name: %windir%\shellnew\bbm-yomljimc.exe
File type: Executable File
Mime Type: unknown/exe
Group: Malware file

%windir%\shellnew\sempalong.exe

File name: %windir%\shellnew\sempalong.exe
File type: Executable File
Mime Type: unknown/exe
Group: Malware file

%windir%\system32\cmd-bro-olx.exe

File name: %windir%\system32\cmd-bro-olx.exe
File type: Executable File
Mime Type: unknown/exe
Group: Malware file

%windir%\system32\cmd-bro-plx.exe

File name: %windir%\system32\cmd-bro-plx.exe
File type: Executable File
Mime Type: unknown/exe
Group: Malware file

%windir%\system32\cmd-bro-ilx.exe

File name: %windir%\system32\cmd-bro-ilx.exe
File type: Executable File
Mime Type: unknown/exe
Group: Malware file

%windir%\system32\cmd-bro-jkx.exe

File name: %windir%\system32\cmd-bro-jkx.exe
File type: Executable File
Mime Type: unknown/exe
Group: Malware file

%windir%\system32\cmd-bro-jlx.exe

File name: %windir%\system32\cmd-bro-jlx.exe
File type: Executable File
Mime Type: unknown/exe
Group: Malware file

%windir%\system32\drivers\etc\hosts-denied by-%UserName%.com

File name: %windir%\system32\drivers\etc\hosts-denied by-%UserName%.com
File type: Command, executable file
Mime Type: unknown/com
Group: Malware file

%windir%\system32\%UserName%'s Setting.scr

File name: %windir%\system32\%UserName%'s Setting.scr
Mime Type: unknown/scr
Group: Malware file

%windir%\system32\dxblcw.exe

File name: %windir%\system32\dxblcw.exe
File type: Executable File
Mime Type: unknown/exe
Group: Malware file

%windir%\system32\dxblbk.exe

File name: %windir%\system32\dxblbk.exe
File type: Executable File
Mime Type: unknown/exe
Group: Malware file

%windir%\system32\dxblbt.exe

File name: %windir%\system32\dxblbt.exe
File type: Executable File
Mime Type: unknown/exe
Group: Malware file

%windir%\system32\dxblai.exe

File name: %windir%\system32\dxblai.exe
File type: Executable File
Mime Type: unknown/exe
Group: Malware file

%windir%\system32\dxblap.exe

File name: %windir%\system32\dxblap.exe
File type: Executable File
Mime Type: unknown/exe
Group: Malware file

Registry Modifications

The following newly produced Registry Values are:

HKEY..\..\{Value}HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run "Tok-Cirrhatus" = "%APPDATA%\smss.exe"HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SafeBoot "AlternateShell" = "cmd-bro-olx.exe"HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run "Bron-Spizaetus" = "%windir%\shellnew\sempalong.exe"HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run "Tok-Cirrhatus-3444" = "%APPDATA%\br7911on.exe"HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon "Shell" = "explorer.exe "%windir%\berasjatah.exe"""HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\ZoneMap "ProxyBypass" = "1"HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\System "DisableRegistryTools" = "1"HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer "NoFolderOptions" = "1"