ViRobot

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Threats DB

Backdoor.Win32.IRCBot.81920.S

Aliases  
Typical Symptoms  Generating traffics,Accessing certain IRC server,Decreases network speed
Discovered  [korea] 2009-05-08
 [Foreign] 0000-00-00
Type  Backdoor ActiveField  Win32
Destory/Distribution
Origin  China Encryption  NO
Location  None Memory residence  NO
Scan engine needed
2009-5-8 [Able to detect & repair]
  • Free scan
  • Free trial download
Description


[Detailed Information]
 

1. After infection, it creates the files like below. 

   (Windows Folder) \system\lsass.exe (Backdoor.Win32.IRCBot.81920.S)
                Or    \system\dllcache.exe (Backdoor.Win32.IRCBot.81920.S)
   (System Folder) \drivers\sysdrv32.sys (Worm.Win32.Autorun.11656)

2. It registers the created malicious codes to registry for auto-executing itself on system restartup.

3. The malicious code receives commands by connecting to IRC server "1.sxxxxww.com (2xx.6x.x.x)".

4. As the same bandwith of infected system, it sends MAC ARP spoofing and packets to 445 port indiscriminatel.

5. Depends on the number of infected systems, the whole network could be paralyzed through above attacks.



Removal Instructions
[How to repair]

1. If you are WinXP/ME users, please be inactivate System Recovery Function.

The reason why being inactivate of the system recovery is to clean the virus completely.
You can refer to MS technical documents(Q263455) for more details.

2. Update the engine module for the latest one.
To repair this virus, you need to update the engine for the latest one.

a. ViRobot products users
     -Download the latest engine files via our website (www.hauri.net)

b. Non-ViRobot products users
     - Use the LiveCall (Free Scan) via the website (http://www.livecall.co.kr)

     - Use the trial version of ViRobot products (30days only)

3. How to scan the virus.

a. Run your ViRobot, and choose "all files" in scan option.

- ViRobot Expert 4.0 : [Edit] -> [Configuration] -> [Scan] : Check all files
  
- ViRobot Desktop 5.0 : [Tools] -> [Configuration] -> [Virus Scan] : Check all files

- ViRobot Desktop 5.5 : [Tools] -> [Configuration] -> [Virus Scan] : Check all files

- LiveCall (Free Scan) : [Advanced Scan] : Check

b. Repair all viruses detected.

c. If [Auto-repair after rebooting] message shows up, please try to re-scan after rebooting the PC.
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