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Ran a Combo Fix on an WIN XP machine.

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#1 frankrh


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Posted 13 November 2016 - 01:29 AM

I didn't realize that you should not download and run ComboFix unless an expert tells you to do so.until after I had downloaded it from Bleeping Computer and was running it.  I did some more research on the program while it was running like finding the online user guide for it.

(There were some issues I was having on my WIN XP machine which I had been unable to solve and just thought I would try see if ComboFix would identify some problems and fix them automatically or tell me about them.)  It ran and finished and gave me a ComboFix log. I have not made any changes to my computer based on the log. 

However, I can't really tell from the log whether anything was automatically fixed or quarantined or what, for sure, are issues that need to be addressed.

I am concerned especially about the references to "Locky"  Here are two examples from the log.  There are 11 entries related to "Locky" and sKUDUevJbZu.  Here are the first 2.

@Denied: (B 2 3) (Everyone)
@Denied: (B 2 3) (Everyone)
I would like to submit the ComboFix log and have someone look it over and tell me if there are anythings that were automatically fixed and tell me about the "Locky" references, and if if there is anything I need to do based on the report.

Thanks for any help.

Frank Hill

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#2 quietman7


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Posted 13 November 2016 - 08:56 AM

Any files that are encrypted with Locky Ransomware will be renamed with random alpha-numerical characters and have the .locky, .zepto, .odin. or .sh*t extension appended to the end of the encrypted data filename in the following format [unique_id][identifier].locky...(i.e. something like F67091F1D24A922B1A7FC27E19A9D9BC.locky). Older Locky variants will store various information in the registry under the following keys:

  • HKCU\Software\Locky\id - The unique ID assigned to the victim.
  • HKCU\Software\Locky\pubkey - The RSA public key.
  • HKCU\Software\Locky\paytext - The text that is stored in the ransom notes.
  • HKCU\Software\Locky\completed - Whether the ransomware finished encrypting the computer

The newest Locky variants do not create HKCU\Software\Locky registry entries anymore. If these keys are present, then either the system is infected with an older variant or some security/anti-ransomware software was installed and added the entries as a vaccine to prevent infection...the old Locky variant is not able to encrypt any files if these registry entries are present. According to several users commenting here, Bitdefender Crypto-Ransomware Vaccine will create the HKCU\Software\Locky\ entry. Other security products may create the same entries as protection against infection.

ComboFix logs are not permitted in this forum.

If you want someone to review your log, please follow the instructions in the Preparation Guide For Requesting Help starting at Step 6.

  • If you cannot complete a step, then skip it and continue with the next.
  • In Step 6 there are instructions for downloading and running FRST which will create two logs.

When you have done that, post your logs to include your ComboFix log in the Virus, Trojan, Spyware, and Malware Removal Logs forum, NOT here, for assistance by the Malware Response Team Experts.

Start a new topic, give it a relevant title and post your log(s) along with a brief description of your problem, a summary of any anti-malware tools you have used and a summary of any steps that you have performed on your own. If you cannot produce any of the required logs...start the new topic anyway. Explain that you followed the Prep. Guide, were unable to create the logs, and describe what happened when you tried to create them. A member of the Malware Removal Team will walk you through, step by step, on how to clean your computer.

If you choose to follow the above instructions and post a FRST log, please reply back in this thread with a link to the new topic.

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