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Backdoor:JS/C99shell.A description and removal instruction


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Technical information
Removal instructions

Technical information

The Backdoor:JS/C99shell.A will install rogue security software TOPOPTIMIZER into the affected machines without users knowledge. The Backdoor:JS/C99shell.A file size is 10240 bytes.


Once launched, the Backdoor:JS/C99shell.A performs the following actions:

  • Download rogue security tool TOPOPTIMIZER from the following domains:
  • Modify the properties of the following files:

    (10240 bytes; detected by HitMalware as " Backdoor:JS/C99shell.A")
  • Removal instructions

    If your machine doesn't have antivirus/antispyware, please take the following steps to resolve the problems caused by Backdoor:JS/C99shell.A:

    1. Replace the infected file dciman32.dll for free by using dciman32.dll repair tool - DLL Suite. See how to replace dciman32.dll by using DLL Suite.

    2. Perform a full Backdoor:JS/C99shell.A scan by using the latest antivirus/antispyware HitMalware.
    (Download Trial Version Now)

    MD5: 23971882397188

    How to replace dciman32.dll by using DLL Suite

  • Download DLL Suite, install and run
  • Click "Start Scan" button to check dciman32.dll file
  • Choose dciman32.dll and click "More Information"
  • Download dciman32.dll for free from the open web page
  • Save dciman32.dll to its default folder to replace infected dciman32.dll file.
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