WORM_BRONTOK.BA
Windows 2000, Windows XP, Windows Server 2003
Threat Type: Worm
Destructiveness: No
Encrypted: No
In the wild: Yes
OVERVIEW
This worm arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
It modifies the affected system's HOSTS files. This prevents users from accessing certain websites.
TECHNICAL DETAILS
Arrival Details
This worm 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 worm drops the following files:
- %System Root%\Baca Bro !!!.txt
- %System%\s4563\c.bron.tok.txt
- %System%\s4563\domlist.txt
(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.. %System% is the Windows system folder, which is usually C:\Windows\System32.)
It drops the following copies of itself into the affected system:
- %Application Data%\dv684780x\yesbron.com
- %Application Data%\jalak-93847815-bali.com
- %System%\c_38082k.com
- %System%\s4563\smss.exe
- %System%\s4563\csrss.exe
- %System%\s4563\lsass.exe
- %System%\s4563\m4227.exe
- %System%\s4563\services.exe
- %System%\s4563\winlogon.exe
- %System%\s4563\zh59847884y.exe
- %Windows%\j6380822.exe
- %Windows%\o4380827.exe
- %Windows%\_default38082.pif
- %Windows%\wi9426\qm4227.exe
It creates the following folders:
- %Application Data%\dv684780x
- %System%\s4563
- %System%\s4563\Spread.Mail.Bro
- %System%\s4563\Spread.Sent.Bro
- %Windows%\wi9426
(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming on Windows Vista and 7.. %System% is the Windows system folder, which is usually C:\Windows\System32.. %Windows% is the Windows folder, which is usually C:\Windows.)
Autostart Technique
This worm adds the following registry entries to enable its automatic execution at every system startup:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
Explorer\run
f1332win = "%Application Data%\dv684780x\yesbron.com"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
f1332win = "%System%\s4563\zh59847884y.exe"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\policies\
Explorer\run
A6108r = "%Windows%\_default38082.pif"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
A6108r = "%Windows%\j6380822.exe"
It modifies the following registry entries to ensure it automatic execution at every system startup:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Winlogon
Shell = "Explorer.exe "%Windows%\o4380827.exe""
(Note: The default value data of the said registry entry is Explorer.exe.)
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Winlogon
Userinit = "%System%\userinit.exe,%Windows%\j6380822.exe"
(Note: The default value data of the said registry entry is %System%\userinit.exe,.)
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Control\SafeBoot
AlternateShell = "c_38082k.com"
(Note: The default value data of the said registry entry is cmd.exe.)
Other System Modifications
This worm adds the following registry entries:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
System
DisableRegistryTools = "1"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Schedule
AtTaskMaxHours = "48"
It adds the following registry keys as part of its installation routine:
HKEY_CURRENT_USER\Software\Brontok
It modifies the following registry entries:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
Advanced
Hidden = "0"
(Note: The default value data of the said registry entry is 1.)
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
Advanced
HideFileExt = "1"
(Note: The default value data of the said registry entry is 0.)
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
Advanced
ShowSuperHidden = "0"
(Note: The default value data of the said registry entry is 1.)
HOSTS File Modification
This worm adds the following strings to the Windows HOSTS file:
- #JowoBot-CrackHost
- 127.0.0.22 mcafee.com
- 127.0.0.22 www.mcafee.com
- 127.0.0.22 mcafee.net
- 127.0.0.22 www.mcafee.net
- 127.0.0.22 mcafee.org
- 127.0.0.22 www.mcafee.org
- 127.0.0.22 mcafeesecurity.com
- 127.0.0.22 www.mcafeesecurity.com
- 127.0.0.22 mcafeesecurity.net
- 127.0.0.22 www.mcafeesecurity.net
- 127.0.0.22 mcafeesecurity.org
- 127.0.0.22 www.mcafeesecurity.org
- 127.0.0.22 mcafeeb2b.com
- 127.0.0.22 www.mcafeeb2b.com
- 127.0.0.22 mcafeeb2b.net
- 127.0.0.22 www.mcafeeb2b.net
- 127.0.0.22 mcafeeb2b.org
- 127.0.0.22 www.mcafeeb2b.org
- 127.0.0.22 nai.com
- 127.0.0.22 www.nai.com
- 127.0.0.22 nai.net
- 127.0.0.22 www.nai.net
- 127.0.0.22 nai.org
- 127.0.0.22 www.nai.org
- 127.0.0.22 vil.nai.com
- 127.0.0.22 www.vil.nai.com
- 127.0.0.22 vil.nai.net
- 127.0.0.22 www.vil.nai.net
- 127.0.0.22 vil.nai.org
- 127.0.0.22 www.vil.nai.org
- 127.0.0.22 grisoft.com
- 127.0.0.22 www.grisoft.com
- 127.0.0.22 grisoft.net
- 127.0.0.22 www.grisoft.net
- 127.0.0.22 grisoft.org
- 127.0.0.22 www.grisoft.org
- 127.0.0.22 kaspersky-labs.com
- 127.0.0.22 www.kaspersky-labs.com
- 127.0.0.22 kaspersky-labs.net
- 127.0.0.22 www.kaspersky-labs.net
- 127.0.0.22 kaspersky-labs.org
- 127.0.0.22 www.kaspersky-labs.org
- 127.0.0.22 kaspersky.com
- 127.0.0.22 www.kaspersky.com
- 127.0.0.22 kaspersky.net
- 127.0.0.22 www.kaspersky.net
- 127.0.0.22 kaspersky.org
- 127.0.0.22 www.kaspersky.org
- 127.0.0.22 downloads1.kaspersky-labs.com
- 127.0.0.22 www.downloads1.kaspersky-labs.com
- 127.0.0.22 downloads1.kaspersky-labs.net
- 127.0.0.22 www.downloads1.kaspersky-labs.net
- 127.0.0.22 downloads1.kaspersky-labs.org
- 127.0.0.22 www.downloads1.kaspersky-labs.org
- 127.0.0.22 downloads2.kaspersky-labs.com
- 127.0.0.22 www.downloads2.kaspersky-labs.com
- 127.0.0.22 downloads2.kaspersky-labs.net
- 127.0.0.22 www.downloads2.kaspersky-labs.net
- 127.0.0.22 downloads2.kaspersky-labs.org
- 127.0.0.22 www.downloads2.kaspersky-labs.org
- 127.0.0.22 downloads3.kaspersky-labs.com
- 127.0.0.22 www.downloads3.kaspersky-labs.com
- 127.0.0.22 downloads3.kaspersky-labs.net
- 127.0.0.22 www.downloads3.kaspersky-labs.net
- 127.0.0.22 downloads3.kaspersky-labs.org
- 127.0.0.22 www.downloads3.kaspersky-labs.org
- 127.0.0.22 downloads4.kaspersky-labs.com
- 127.0.0.22 www.downloads4.kaspersky-labs.com
- 127.0.0.22 downloads4.kaspersky-labs.net
- 127.0.0.22 www.downloads4.kaspersky-labs.net
- 127.0.0.22 downloads4.kaspersky-labs.org
- 127.0.0.22 www.downloads4.kaspersky-labs.org
- 127.0.0.22 download.mcafee.com
- 127.0.0.22 www.download.mcafee.com
- 127.0.0.22 download.mcafee.net
- 127.0.0.22 www.download.mcafee.net
- 127.0.0.22 download.mcafee.org
- 127.0.0.22 www.download.mcafee.org
- 127.0.0.22 norton.com
- 127.0.0.22 www.norton.com
- 127.0.0.22 norton.net
- 127.0.0.22 www.norton.net
- 127.0.0.22 norton.org
- 127.0.0.22 www.norton.org
- 127.0.0.22 symantec.com
- 127.0.0.22 www.symantec.com
- 127.0.0.22 symantec.net
- 127.0.0.22 www.symantec.net
- 127.0.0.22 symantec.org
- 127.0.0.22 www.symantec.org
- 127.0.0.22 liveupdate.symantecliveupdate.com
- 127.0.0.22 www.liveupdate.symantecliveupdate.com
- 127.0.0.22 liveupdate.symantecliveupdate.net
- 127.0.0.22 www.liveupdate.symantecliveupdate.net
- 127.0.0.22 liveupdate.symantecliveupdate.org
- 127.0.0.22 www.liveupdate.symantecliveupdate.org
- 127.0.0.22 liveupdate.symantec.com
- 127.0.0.22 www.liveupdate.symantec.com
- 127.0.0.22 liveupdate.symantec.net
- 127.0.0.22 www.liveupdate.symantec.net
- 127.0.0.22 liveupdate.symantec.org
- 127.0.0.22 www.liveupdate.symantec.org
- 127.0.0.22 update.symantec.com
- 127.0.0.22 www.update.symantec.com
- 127.0.0.22 update.symantec.net
- 127.0.0.22 www.update.symantec.net
- 127.0.0.22 update.symantec.org
- 127.0.0.22 www.update.symantec.org
- 127.0.0.22 securityresponse.symantec.com
- 127.0.0.22 www.securityresponse.symantec.com
- 127.0.0.22 securityresponse.symantec.net
- 127.0.0.22 www.securityresponse.symantec.net
- 127.0.0.22 securityresponse.symantec.org
- 127.0.0.22 www.securityresponse.symantec.org
- 127.0.0.22 sarc.com
- 127.0.0.22 www.sarc.com
- 127.0.0.22 sarc.net
- 127.0.0.22 www.sarc.net
- 127.0.0.22 sarc.org
- 127.0.0.22 www.sarc.org
- 127.0.0.22 vaksin.com
- 127.0.0.22 www.vaksin.com
- 127.0.0.22 vaksin.net
- 127.0.0.22 www.vaksin.net
- 127.0.0.22 vaksin.org
- 127.0.0.22 www.vaksin.org
- 127.0.0.22 forum.vaksin.com
- 127.0.0.22 www.forum.vaksin.com
- 127.0.0.22 forum.vaksin.net
- 127.0.0.22 www.forum.vaksin.net
- 127.0.0.22 forum.vaksin.org
- 127.0.0.22 www.forum.vaksin.org
- 127.0.0.22 norman.com
- 127.0.0.22 www.norman.com
- 127.0.0.22 norman.net
- 127.0.0.22 www.norman.net
- 127.0.0.22 norman.org
- 127.0.0.22 www.norman.org
- 127.0.0.22 trendmicro.com
- 127.0.0.22 www.trendmicro.com
- 127.0.0.22 trendmicro.net
- 127.0.0.22 www.trendmicro.net
- 127.0.0.22 trendmicro.org
- 127.0.0.22 www.trendmicro.org
- 127.0.0.22 trendmicro-europe.com
- 127.0.0.22 www.trendmicro-europe.com
- 127.0.0.22 trendmicro-europe.net
- 127.0.0.22 www.trendmicro-europe.net
- 127.0.0.22 trendmicro-europe.org
- 127.0.0.22 www.trendmicro-europe.org
- 127.0.0.22 ae.trendmicro-europe.com
- 127.0.0.22 www.ae.trendmicro-europe.com
- 127.0.0.22 ae.trendmicro-europe.net
- 127.0.0.22 www.ae.trendmicro-europe.net
- 127.0.0.22 ae.trendmicro-europe.org
- 127.0.0.22 www.ae.trendmicro-europe.org
- 127.0.0.22 it.trendmicro-europe.com
- 127.0.0.22 www.it.trendmicro-europe.com
- 127.0.0.22 it.trendmicro-europe.net
- 127.0.0.22 www.it.trendmicro-europe.net
- 127.0.0.22 it.trendmicro-europe.org
- 127.0.0.22 www.it.trendmicro-europe.org
- 127.0.0.22 secunia.com
- 127.0.0.22 www.secunia.com
- 127.0.0.22 secunia.net
- 127.0.0.22 www.secunia.net
- 127.0.0.22 secunia.org
- 127.0.0.22 www.secunia.org
- 127.0.0.22 winantivirus.com
- 127.0.0.22 www.winantivirus.com
- 127.0.0.22 winantivirus.net
- 127.0.0.22 www.winantivirus.net
- 127.0.0.22 winantivirus.org
- 127.0.0.22 www.winantivirus.org
- 127.0.0.22 pandasoftware.com
- 127.0.0.22 www.pandasoftware.com
- 127.0.0.22 pandasoftware.net
- 127.0.0.22 www.pandasoftware.net
- 127.0.0.22 pandasoftware.org
- 127.0.0.22 www.pandasoftware.org
- 127.0.0.22 esafe.com
- 127.0.0.22 www.esafe.com
- 127.0.0.22 esafe.net
- 127.0.0.22 www.esafe.net
- 127.0.0.22 esafe.org
- 127.0.0.22 www.esafe.org
- 127.0.0.22 f-secure.com
- 127.0.0.22 www.f-secure.com
- 127.0.0.22 f-secure.net
- 127.0.0.22 www.f-secure.net
- 127.0.0.22 f-secure.org
- 127.0.0.22 www.f-secure.org
- 127.0.0.22 europe.f-secure.com
- 127.0.0.22 www.europe.f-secure.com
- 127.0.0.22 europe.f-secure.net
- 127.0.0.22 www.europe.f-secure.net
- 127.0.0.22 europe.f-secure.org
- 127.0.0.22 www.europe.f-secure.org
- 127.0.0.22 bhs.com
- 127.0.0.22 www.bhs.com
- 127.0.0.22 bhs.net
- 127.0.0.22 www.bhs.net
- 127.0.0.22 bhs.org
- 127.0.0.22 www.bhs.org
- 127.0.0.22 datafellows.com
- 127.0.0.22 www.datafellows.com
- 127.0.0.22 datafellows.net
- 127.0.0.22 www.datafellows.net
- 127.0.0.22 datafellows.org
- 127.0.0.22 www.datafellows.org
- 127.0.0.22 cheyenne.com
- 127.0.0.22 www.cheyenne.com
- 127.0.0.22 cheyenne.net
- 127.0.0.22 www.cheyenne.net
- 127.0.0.22 cheyenne.org
- 127.0.0.22 www.cheyenne.org
- 127.0.0.22 ontrack.com
- 127.0.0.22 www.ontrack.com
- 127.0.0.22 ontrack.net
- 127.0.0.22 www.ontrack.net
- 127.0.0.22 ontrack.org
- 127.0.0.22 www.ontrack.org
- 127.0.0.22 sands.com
- 127.0.0.22 www.sands.com
- 127.0.0.22 sands.net
- 127.0.0.22 www.sands.net
- 127.0.0.22 sands.org
- 127.0.0.22 www.sands.org
- 127.0.0.22 sophos.com
- 127.0.0.22 www.sophos.com
- 127.0.0.22 sophos.net
- 127.0.0.22 www.sophos.net
- 127.0.0.22 sophos.org
- 127.0.0.22 www.sophos.org
- 127.0.0.22 icubed.com
- 127.0.0.22 www.icubed.com
- 127.0.0.22 icubed.net
- 127.0.0.22 www.icubed.net
- 127.0.0.22 icubed.org
- 127.0.0.22 www.icubed.org
- 127.0.0.22 perantivirus.com
- 127.0.0.22 www.perantivirus.com
- 127.0.0.22 perantivirus.net
- 127.0.0.22 www.perantivirus.net
- 127.0.0.22 perantivirus.org
- 127.0.0.22 www.perantivirus.org
- 127.0.0.22 castlecops.com
- 127.0.0.22 www.castlecops.com
- 127.0.0.22 castlecops.net
- 127.0.0.22 www.castlecops.net
- 127.0.0.22 castlecops.org
- 127.0.0.22 www.castlecops.org
- 127.0.0.22 virustotal.com
- 127.0.0.22 www.virustotal.com
- 127.0.0.22 virustotal.net
- 127.0.0.22 www.virustotal.net
- 127.0.0.22 virustotal.org
- 127.0.0.22 www.virustotal.org
- 127.0.0.22 free-av.com
- 127.0.0.22 www.free-av.com
- 127.0.0.22 free-av.net
- 127.0.0.22 www.free-av.net
- 127.0.0.22 free-av.org
- 127.0.0.22 www.free-av.org
- 127.0.0.22 antivirus.com
- 127.0.0.22 www.antivirus.com
- 127.0.0.22 antivirus.net
- 127.0.0.22 www.antivirus.net
- 127.0.0.22 antivirus.org
- 127.0.0.22 www.antivirus.org
- 127.0.0.22 anti-virus.com
- 127.0.0.22 www.anti-virus.com
- 127.0.0.22 anti-virus.net
- 127.0.0.22 www.anti-virus.net
- 127.0.0.22 anti-virus.org
- 127.0.0.22 www.anti-virus.org
- 127.0.0.22 ca.com
- 127.0.0.22 www.ca.com
- 127.0.0.22 ca.net
- 127.0.0.22 www.ca.net
- 127.0.0.22 ca.org
- 127.0.0.22 www.ca.org
- 127.0.0.22 fajarweb.com
- 127.0.0.22 www.fajarweb.com
- 127.0.0.22 fajarweb.net
- 127.0.0.22 www.fajarweb.net
- 127.0.0.22 fajarweb.org
- 127.0.0.22 www.fajarweb.org
- 127.0.0.22 jasakom.com
- 127.0.0.22 www.jasakom.com
- 127.0.0.22 jasakom.net
- 127.0.0.22 www.jasakom.net
- 127.0.0.22 jasakom.org
- 127.0.0.22 www.jasakom.org
- 127.0.0.22 backup.grisoft.com
- 127.0.0.22 www.backup.grisoft.com
- 127.0.0.22 backup.grisoft.net
- 127.0.0.22 www.backup.grisoft.net
- 127.0.0.22 backup.grisoft.org
- 127.0.0.22 www.backup.grisoft.org
- 127.0.0.22 infokomputer.com
- 127.0.0.22 www.infokomputer.com
- 127.0.0.22 infokomputer.net
- 127.0.0.22 www.infokomputer.net
- 127.0.0.22 infokomputer.org
- 127.0.0.22 www.infokomputer.org
- 127.0.0.22 playboy.com
- 127.0.0.22 www.playboy.com
- 127.0.0.22 playboy.net
- 127.0.0.22 www.playboy.net
- 127.0.0.22 playboy.org
- 127.0.0.22 www.playboy.org
- 127.0.0.22 sex-mission.com
- 127.0.0.22 www.sex-mission.com
- 127.0.0.22 sex-mission.net
- 127.0.0.22 www.sex-mission.net
- 127.0.0.22 sex-mission.org
- 127.0.0.22 www.sex-mission.org
- 127.0.0.22 pornstargals.com
- 127.0.0.22 www.pornstargals.com
- 127.0.0.22 pornstargals.net
- 127.0.0.22 www.pornstargals.net
- 127.0.0.22 pornstargals.org
- 127.0.0.22 www.pornstargals.org
- 127.0.0.22 kaskus.com
- 127.0.0.22 www.kaskus.com
- 127.0.0.22 kaskus.net
- 127.0.0.22 www.kaskus.net
- 127.0.0.22 kaskus.org
- 127.0.0.22 www.kaskus.org
- 127.0.0.22 17tahun.com
- 127.0.0.22 www.17tahun.com
- 127.0.0.22 17tahun.net
- 127.0.0.22 www.17tahun.net
- 127.0.0.22 17tahun.org
- 127.0.0.22 www.17tahun.org
- 127.0.0.22 padinet.com
- 127.0.0.22 www.padinet.com
- 127.0.0.22 padinet.net
- 127.0.0.22 www.padinet.net
- 127.0.0.22 padinet.org
- 127.0.0.22 www.padinet.org
- 127.0.0.22 jeruk.padinet.com
- 127.0.0.22 www.jeruk.padinet.com
- 127.0.0.22 jeruk.padinet.net
- 127.0.0.22 www.jeruk.padinet.net
- 127.0.0.22 jeruk.padinet.org
- 127.0.0.22 www.jeruk.padinet.org
- 127.0.0.22 compactbyte.com
- 127.0.0.22 www.compactbyte.com
- 127.0.0.22 compactbyte.net
- 127.0.0.22 www.compactbyte.net
- 127.0.0.22 compactbyte.org
- 127.0.0.22 www.compactbyte.org
- 127.0.0.22 blog.compactbyte.com
- 127.0.0.22 www.blog.compactbyte.com
- 127.0.0.22 blog.compactbyte.net
- 127.0.0.22 www.blog.compactbyte.net
- 127.0.0.22 blog.compactbyte.org
- 127.0.0.22 www.blog.compactbyte.org
- 127.0.0.22 blogs.compactbyte.com
- 127.0.0.22 www.blogs.compactbyte.com
- 127.0.0.22 blogs.compactbyte.net
- 127.0.0.22 www.blogs.compactbyte.net
- 127.0.0.22 blogs.compactbyte.org
- 127.0.0.22 www.blogs.compactbyte.org
- #JowoBot-VM Community
Other Details
This worm connects to the following possibly malicious URL:
- http://www.{BLOCKED}free.org/Arts/bddwyrk/inf22.css
- http://{BLOCKED}ing.com/WS1/cgi/x.cgi?NAVG=Tracker&username=dudxwd
NOTES:
It renames the file %System%\msvbvm60.dll to %System%\msvbvm60.dll.{random number}.
SOLUTION
Step 1
Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.
Step 2
Identify and delete files detected as WORM_BRONTOK.BA using either the Startup Disk or Recovery Console
Step 3
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\Policies\Explorer\run
- f1332win = "%Application Data%\dv684780x\yesbron.com"
- f1332win = "%Application Data%\dv684780x\yesbron.com"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- f1332win = "%System%\s4563\zh59847884y.exe"
- f1332win = "%System%\s4563\zh59847884y.exe"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\Explorer\run
- A6108r = "%Windows%\_default38082.pif"
- A6108r = "%Windows%\_default38082.pif"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
- A6108r = "%Windows%\j6380822.exe"
- A6108r = "%Windows%\j6380822.exe"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\System
- DisableRegistryTools = "1"
- DisableRegistryTools = "1"
- In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Schedule
- AtTaskMaxHours = "48"
- AtTaskMaxHours = "48"
Step 4
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. Before you could do this, you must restart in Safe Mode. For instructions on how to do this, you may refer to this page If the preceding step requires you to restart in safe mode, you may proceed to edit the system registry.
- In HKEY_CURRENT_USER\Software
- Brontok
- Brontok
Step 5
Restore this modified 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_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon
- From: Shell = "Explorer.exe "%Windows%\o4380827.exe""
To: Shell = "Explorer.exe"
- From: Shell = "Explorer.exe "%Windows%\o4380827.exe""
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon
- From: Userinit = "%System%\userinit.exe,%Windows%\j6380822.exe"
To: Userinit = "%System%\userinit.exe,"
- From: Userinit = "%System%\userinit.exe,%Windows%\j6380822.exe"
- In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SafeBoot
- From: AlternateShell = "c_38082k.com"
To: AlternateShell = "cmd.exe"
- From: AlternateShell = "c_38082k.com"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced
- From: Hidden = "0"
To: Hidden = "1"
- From: Hidden = "0"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced
- From: HideFileExt = "1"
To: HideFileExt = "0"
- From: HideFileExt = "1"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced
- From: ShowSuperHidden = "0"
To: ShowSuperHidden = "1"
- From: ShowSuperHidden = "0"
Step 6
Search and delete these folders
- %Application Data%\dv684780x
- %System%\s4563
- %Windows%\wi9426
Step 7
Search and delete this file
- %System Root%\Baca Bro !!!.txt
Step 8
Scan your computer with your Trend Micro product to delete files detected as WORM_BRONTOK.BA. 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 9
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.
- %System%\drivers\etc\hosts
NOTES:
To Restore Renamed File:
- Go to the directory %System%
- Rename the file %System%\msvbvm60.dll.{random number} to %System%\msvbvm60.dll
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