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Backdoor:Win32/Cycbot.B


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#1 Ryan360

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Posted 25 December 2010 - 08:51 PM

Hi. Today sometime I got the trojan Backdoor:Win32/Cycbot.B. I was looking for some advice on how to get rid of it properly. I use 64bit windows vista home premium. I've looked online and seen its a very powerful trojan and i do have sensitive info on this computer. Any help you can give would be great thanks! Just did Malwarebytes' Anti-Malware,heres the log:

Malwarebytes' Anti-Malware 1.46
www.malwarebytes.org

Database version: 4052

Windows 6.0.6002 Service Pack 2
Internet Explorer 8.0.6001.18999

25/12/2010 9:28:09 PM
mbam-log-2010-12-25 (21-28-09).txt

Scan type: Quick scan
Objects scanned: 121982
Time elapsed: 5 minute(s), 34 second(s)

Memory Processes Infected: 0
Memory Modules Infected: 0
Registry Keys Infected: 0
Registry Values Infected: 0
Registry Data Items Infected: 1
Folders Infected: 0
Files Infected: 2

Memory Processes Infected:
(No malicious items detected)

Memory Modules Infected:
(No malicious items detected)

Registry Keys Infected:
(No malicious items detected)

Registry Values Infected:
(No malicious items detected)

Registry Data Items Infected:
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Windows\Load (Trojan.Agent) -> Data: c:\users\ryan\appdata\local\temp\csrss.exe -> Quarantined and deleted successfully.

Folders Infected:
(No malicious items detected)

Files Infected:
C:\Users\Ryan\AppData\Local\Temp\csrss.exe (Trojan.Agent) -> Quarantined and deleted successfully.
C:\Users\Ryan\AppData\Local\Temp\0.017413330670239646.exe (Trojan.Dropper) -> Quarantined and deleted successfully.

Edited by Orange Blossom, 25 December 2010 - 09:03 PM.
Moved to AII. ~ OB


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#2 boopme

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Posted 25 December 2010 - 11:10 PM

Hello and welcome,that MBAm is quite outdated.

First this is our position on a backdoor infection.....

A backdoor Trojan can allow an attacker to
gain control of the system, log keystrokes, steal passwords, access personal
data, send malevolent outgoing traffic, and close the security warning
messages displayed by some anti-virus and security programs.

I would advise you to disconnect this PC from the Internet, and then go to
a known clean computer and change any passwords or security information held
on the infected computer. In particular, check whatever relates to online
banking financial transactions, shopping, credit cards, or sensitive
personal information. It is also wise to contact your financial institutions
to apprise them of your situation.

We will do our best to clean the computer of any infections seen on the log.
However, because of the nature of this Trojan, I cannot offer a total
guarantee that there are no remnants left in the system, or that the
computer will be trustworthy.

Many security experts believe that once infected with this type of Trojan,
the best course of action is to reformat and reinstall the Operating System.
Making this decision is based on what the computer is used for, and what
information can be accessed from it.

Knowing the above,if you wish to proceed....>>>




Rerun MBAM (MalwareBytes) like this:

Open MBAM in normal/regular mode and click Update tab, select Check for Updates,when done
click Scanner tab,select Quick scan and scan (normal mode).
After scan click Remove Selected, Post new scan log and Reboot into normal mode.


Please download the TDSS Rootkit Removing Tool (TDSSKiller.exe) and save it to your Desktop. <-Important!!!
Be sure to download TDSSKiller.exe (v2.4.0.0) from Kaspersky's website and not TDSSKiller.zip which appears to be an older version 2.3.2.2 of the tool.
  • Double-click on TDSSKiller.exe to run the tool for known TDSS variants.
    Vista/Windows 7 users right-click and select Run As Administrator.
  • If TDSSKiller does not run, try renaming it.
  • To do this, right-click on TDSSKiller.exe, select Rename and give it a random name with the .com file extension (i.e. 123abc.com). If you do not see the file extension, please refer to How to change the file extension.
  • Click the Start Scan button.
  • Do not use the computer during the scan
  • If the scan completes with nothing found, click Close to exit.
  • If malicious objects are found, they will show in the Scan results - Select action for found objects and offer three options.
  • Ensure Cure (default) is selected, then click Continue > Reboot now to finish the cleaning process.
  • A log file named TDSSKiller_version_date_time_log.txt (i.e. TDSSKiller.2.4.0.0_27.07.2010_09.o7.26_log.txt) will be created and saved to the root directory (usually Local Disk C:).
  • Copy and paste the contents of that file in your next reply.


Follow with an Online scana nd let me know how things are after.
Please perform a scan with Eset Online Antiivirus Scanner.
This scan requires Internet Explorer to work. Vista/Windows 7 users need to run Internet Explorer as Administrator.
To do this, right-click on the IE icon in the Start Menu or Quick Launch Bar on the Taskbar and select Run As Administrator from the context menu.
  • Click the green Posted Image button.
  • Read the End User License Agreement and check the box:
  • Check Posted Image.
  • Click the Posted Image button.
  • Accept any security warnings from your browser.
  • Check Posted Image
  • Check Remove found threats and Scan potentially unwanted applications. (If given the option, choose "Quarantine" instead of delete.)
  • Click the Start button.
  • ESET will then download updates for itself, install itself, and begin scanning your computer.
  • If offered the option to get information or buy software at any point, just close the window.
  • The scan will take a while so be patient and do NOT use the computer while the scan is running. Keep all other programs and windows closed.
  • When the scan completes, push Posted Image
  • Push Posted Image, and save the file to your desktop as ESETScan.txt.
  • Push the Posted Image button, then Finish.
  • Copy and paste the contents of ESETScan.txt in your next reply.
Note: A log.txt file will also be created and automatically saved in the C:\Program Files\EsetOnlineScanner\ folder.
If you did not save the ESETScan log, click Posted Image > Run..., then type or copy and paste everything in the code box below into the Open dialogue box:

C:\Program Files\ESET\EsetOnlineScanner\log.txt
  • Click Ok and the scan results will open in Notepad.
  • Copy and paste the contents of log.txt in your next reply.
-- Some online scanners will detect existing anti-virus software and refuse to cooperate. You may have to disable the real-time protection components of your existing anti-virus and try running the scan again. If you do this, remember to turn them back on after you are finished.

NOTE: In some instances if no malware is found there will be no log produced.
How do I get help? Who is helping me?For the time will come when men will not put up with sound doctrine. Instead, to suit their own desires, they will gather around them a great number of teachers to say what their itching ears want to hear....Become a BleepingComputer fan: Facebook

#3 Ryan360

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Posted 26 December 2010 - 08:56 AM

Here's my log, going to do TTSD now. Thanks for the help


Malwarebytes' Anti-Malware 1.50.1.1100
www.malwarebytes.org

Database version: 5363

Windows 6.0.6002 Service Pack 2
Internet Explorer 8.0.6001.18999

26/12/2010 9:42:55 AM
mbam-log-2010-12-26 (09-42-55).txt

Scan type: Quick scan
Objects scanned: 158368
Time elapsed: 3 minute(s), 44 second(s)

Memory Processes Infected: 0
Memory Modules Infected: 0
Registry Keys Infected: 0
Registry Values Infected: 2
Registry Data Items Infected: 1
Folders Infected: 0
Files Infected: 2

Memory Processes Infected:
(No malicious items detected)

Memory Modules Infected:
(No malicious items detected)

Registry Keys Infected:
(No malicious items detected)

Registry Values Infected:
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Windows\Load (Trojan.Agent) -> Value: Load -> Delete on reboot.
HKEY_CURRENT_USER\Software\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell (Hijack.Shell) -> Value: Shell -> Quarantined and deleted successfully.

Registry Data Items Infected:
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Windows\Load (Trojan.Agent) -> Bad: (C:\Users\Ryan\AppData\Local\Temp\csrss.exe) Good: () -> Quarantined and deleted successfully.

Folders Infected:
(No malicious items detected)

Files Infected:
c:\Users\Ryan\AppData\Roaming\dwm.exe (Trojan.FakeAV) -> Quarantined and deleted successfully.
c:\Users\Ryan\AppData\Local\Temp\csrss.exe (Trojan.Agent) -> Quarantined and deleted successfully.

#4 Ryan360

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Posted 26 December 2010 - 09:05 AM

TDSS found nothing, doing eset now

#5 Ryan360

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Posted 26 December 2010 - 10:47 AM

Here's my Eset log:


C:\Users\Ryan\DoctorWeb\Quarantine\2e8bc37f-155c07b0 multiple threats deleted - quarantined
C:\Users\Ryan\DoctorWeb\Quarantine\conhost1.exe a variant of Win32/Kryptik.JDT trojan cleaned by deleting - quarantined
C:\Users\Ryan\DoctorWeb\Quarantine\conhost2.exe a variant of Win32/Kryptik.JDT trojan cleaned by deleting - quarantined

#6 boopme

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Posted 26 December 2010 - 03:16 PM

Hi, it looks like we removed it. Backdoor:Win32/Cycbot.B is a backdoor trojan that allows attackers unauthorized access and control of an affected computer. After a computer is infected, the trojan connects to a specific IRC server and joins a specific channel to receive commands from attackers. The commands may include instructing the trojan to update itself, visit web links, or download and execute arbitrary files.

If you do any banking or other financial transactions on the PC or if it should contain any other sensitive information, please change all passwords where applicable, and it would be wise to contact those same financial institutions to apprise them of your situation.

How is it running now?
How do I get help? Who is helping me?For the time will come when men will not put up with sound doctrine. Instead, to suit their own desires, they will gather around them a great number of teachers to say what their itching ears want to hear....Become a BleepingComputer fan: Facebook

#7 Ryan360

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Posted 26 December 2010 - 04:27 PM

Everything seems to be running perfect.. so hopefully its gone forever, changing my passwords now. Thanks so much for the help! This is a great site!

#8 boopme

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Posted 26 December 2010 - 06:49 PM

Thank you and you're welcome!!
Now you should Create a New Restore Point to prevent possible reinfection from an old one. Some of the malware you picked up could have been saved in System Restore. Since this is a protected directory your tools cannot access to delete these files, they sometimes can reinfect your system if you accidentally use an old restore point. Setting a new restore point AFTER cleaning your system will help prevent this and enable your computer to "roll-back" to a clean working state.

The easiest and safest way to do this is:
  • Go to Start > Programs > Accessories > System Tools and click "System Restore".
  • Choose the radio button marked "Create a Restore Point" on the first screen then click "Next". Give the R.P. a name, then click "Create". The new point will be stamped with the current date and time. Keep a log of this so you can find it easily should you need to use System Restore.
  • Then use Disk Cleanup to remove all but the most recently created Restore Point.
  • Go to Start > Run and type: Cleanmgr
  • Click "Ok". Disk Cleanup will scan your files for several minutes, then open.
  • Click the "More Options" tab, then click the "Clean up" button under System Restore.
  • Click Ok. You will be prompted with "Are you sure you want to delete all but the most recent restore point?"
  • Click Yes, then click Ok.
  • Click Yes again when prompted with "Are you sure you want to perform these actions?"
  • Disk Cleanup will remove the files and close automatically.
Vista Users can refer to these links: Create a New Restore Point and Disk Cleanup.

Tips to protect yourself against malware and reduce the potential for re-infection:Avoid gaming sites, pirated software, cracking tools, keygens, and peer-to-peer (P2P) file sharing programs. They are a security risk which can make your computer susceptible to a smörgåsbord of malware infections, remote attacks, exposure of personal information, and identity theft. Many malicious worms and Trojans spread across P2P file sharing networks, gaming and underground sites. Users visiting such pages may see innocuous-looking banner ads containing code which can trigger pop-up ads and malicious Flash ads that install viruses, Trojans and spyware. Ads are a target for hackers because they offer a stealthy way to distribute malware to a wide range of Internet users. The best way to reduce the risk of infection is to avoid these types of web sites and not use any P2P applications. Read P2P Software User Advisories and Risks of File-Sharing Technology.

Keeping Autorun enabled on USB and other removable drives has become a significant security risk due to the increasing number of malware variants that can infect them and transfer the infection to your computer. To learn more about this risk, please read:
How do I get help? Who is helping me?For the time will come when men will not put up with sound doctrine. Instead, to suit their own desires, they will gather around them a great number of teachers to say what their itching ears want to hear....Become a BleepingComputer fan: Facebook




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