Jump to content

My network got infected with ransonware


Recommended Posts

hello guys, my entire network got infected. more then 15 servers. i have tried all your tools with no success.  it just says the file encryption key cannot be found. here attached are ransonware note and encrypted file. Today is Saturday night, i'll gladly pay to get this resolved within the next 24 hours. please CONTACT me ASAP help!

thank you

HOW TO RECOVER ENCRYPTED FILES.TXT

notes.txt.amnesia

Link to post
Share on other sites

This appears to be a variant of the Scarab ransomware:
https://id-ransomware.malwarehunterteam.com/identify.php?case=0ac9843a8cdf983158fe459a1547d5b5b876207d

Unfortunately this particular ransomware does not appear to be decryptable for free.

In the case of ransomware like this, which uses secure encryption and generates new public/private keys for every computer it infects, usually there is no way to decrypt the files without getting the private key from the criminals who made the ransomware. You can try a tool such as ShadowExplorer, however ransomware like this usually deletes Volume Shadow Copies, so ShadowExplorer will usually find nothing. Even if the Volume Shadow Copies were not deleted, the odds of finding backup copies of files in them is pretty slim, since Windows would normally only leave backup copies of files in the Volume Shadow Copies if you were using Microsoft's own backup software for data backups (although sometimes the System Restore will save copies of files in the Volume Shadow Copies).
http://www.shadowexplorer.com/

In cases where the Volume Shadow Copies are deleted, then note that ransomware doesn't generally delete them securely, so it might be possible to use a file undelete utility to undelete the old Volume Shadow Copies, and then use ShadowExplorer to recover files, however this isn't necessarily straightforward to do (the computer will need to be running from a bootable disk to have write access to the "System Volume Information" folder, or the hard drive will need to be connected to another computer), and even if you can recover the old Volume Shadow Copies, as mentioned above the odds of there being backup copies of important files in them are low to begin with. Note that you may need to find a local computer technician who can assist you with this if you do want to try it.

Here's a link to a list of file recovery tools at Wikipedia:
https://en.wikipedia.org/wiki/List_of_data_recovery_software#File_Recovery

 

Also note that this ransomware may have been installed after an attacker brute forced to RDP password for an Administrator account on a computer on the network. If that's the case, then here's some recommendations that can help you get started with configuring your network so that this doesn't happen again.

First I recommend temporarily disabling all port rules in your firewall (closing all open ports) until you can do a full audit of your firewall configuration and determine which ports need to remain open. There are some basic recommendations below to help get you started with the port audit.

If you are managing a company network, then some form of IPS/IDS is highly recommended to monitor the network for intrusions. If you already have such a system in place, then I recommend a full audit of any rules you have configured to make sure that the device is providing adequate monitoring. It is also recommended to have someone with penetration testing experience verify that the IPS/IDS is properly alerting when there are intrusion attempts.

Also, quickly change all passwords on any workstations and/or servers that are connected to the same network as the compromised system. Also be sure to change passwords on any online accounts, as well as any routers or switches (or other devices that have network-accessible administration functions).

I recommend that every account have a different password, that passwords be no shorter than 25 characters and be made up of a random combination of uppercase letters, lowercase letters, numbers, and symbols. Obviously passwords like that are difficult (if not impossible) to remember, so a password manager may be required in order to aid in managing passwords. KeePass is probably the simplest password manager, and stores password databases locally instead of on some "cloud" server. If something capable of automatically filling in passwords (or sharing passwords between multiple devices/users) is necessary then there are reasonable passwords managers from LastPass, bitwarden, 1Password, Dashlane, etc. Note that unlike KeePass, these password managers work as extensions added to web browsers (or apps on mobile phones), and they store password databases online.

When auditing your firewall configuration and preparing to reopen ports, I recommend never opening ports globally unless absolutely necessary. I also recommend requiring anyone who needs access to sensitive services (RDP, Windows Networking, etc) to connect to the network via a VPN so that you don't have to open ports for those services in the firewall, and then only open the VPN port in the firewall for IP addresses that need access to it. If someone who needs access has a dynamic IP, then many firewalls these days support something like Single Packet Authorization or Port Knocking to dynamically open ports for unknown IP addresses.

Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Recently Browsing   0 members

    No registered users viewing this page.

×
×
  • Create New...