Dark Reading is part of the Informa Tech Division of Informa PLC

This site is operated by a business or businesses owned by Informa PLC and all copyright resides with them.Informa PLC's registered office is 5 Howick Place, London SW1P 1WG. Registered in England and Wales. Number 8860726.

Comments
Heres How To Protect Against A Ransomware Attack
Newest First  |  Oldest First  |  Threaded View
j03king
100%
0%
j03king,
User Rank: Apprentice
5/16/2016 | 9:44:20 PM
New Strain are Smarter than just targeted common file extensions! Your backup needs to be secured!
Apart from all the other Ransomware Protection best practice 101 guides.....

 

First of all just because you are encrypting your backups doesn't mean a ransomware cannot re-encrypt it. We've had a few cases where all clients had their encrypted backups targeted and damaged by ransomware! Your best defence to safe guard your backups:

1. Permissions - Remove all default file & folder permissions on the repository folder. Specifically add a single backup user permission. eg. create a user "repobackup" with read & write. Deny group administrators to this folder and other groups & users.

Configure your backup software to specifically use the repobackup user to do it's business.

Any access to this folder except for the user repobackup will be denied. So all attempts of the ransomware to find it on the network (including accessing hidden shared drives, c$, d$,etc etc) will be denied access to it once it hits your repofolder.

(even ransomware as they wont have permission to it.)

2. Sftp/scp -  some backup software have modules that will allow for remote replication via SFTP/SCP. You should make use of them.

 

Secondly, you shouldn't rely on simply tricking "ransomware" with renaming your files. We've had two cases of modified ransomware (well they should call it "ransom DAMAGEWARE") that had absolutely no intention of giving victims their data and allowed for * file extension.

 

 

OPTION if it is available to you.

 

Explore the software from "Cylance" for your unconventional Security Suite. So far clients that chose to implement it (following previous attacks), have been miraculously somewhat protected. Even with the new strains such as when Locky started to appear, it has seemed to have innoculated it.
theb0x
50%
50%
theb0x,
User Rank: Ninja
2/9/2016 | 12:53:45 PM
Ransomware
Because ransomware is capable of attacking both local and remote backups, the best line of defense is a proper retention policy of encrypted backups. I suggest a minimum of 2 weeks.

Since the backups are already encrypted, they are simply not vulnerable. No matter what method of attack is used. The ransomware will not have access to these files to apply it's own encryption algorithm.

Also, as far as I know the method of attack utilized is soley by file extension. Ransomware is not yet capable of anylizing mime type file headers. That being said, renaming the extension of a known file type such as a word document (ie .docx) to something completely obscure (ie .zyx612), followed by changing the new file type association to open with MS Word will result in the file indexing of the ransomware to bypass encryption of the unrecognized extension.


Mobile Banking Malware Up 50% in First Half of 2019
Kelly Sheridan, Staff Editor, Dark Reading,  1/17/2020
Active Directory Needs an Update: Here's Why
Raz Rafaeli, CEO and Co-Founder at Secret Double Octopus,  1/16/2020
New Attack Campaigns Suggest Emotet Threat Is Far From Over
Jai Vijayan, Contributing Writer,  1/16/2020
Register for Dark Reading Newsletters
White Papers
Video
Cartoon Contest
Current Issue
The Year in Security: 2019
This Tech Digest provides a wrap up and overview of the year's top cybersecurity news stories. It was a year of new twists on old threats, with fears of another WannaCry-type worm and of a possible botnet army of Wi-Fi routers. But 2019 also underscored the risk of firmware and trusted security tools harboring dangerous holes that cybercriminals and nation-state hackers could readily abuse. Read more.
Flash Poll
How Enterprises are Attacking the Cybersecurity Problem
How Enterprises are Attacking the Cybersecurity Problem
Organizations have invested in a sweeping array of security technologies to address challenges associated with the growing number of cybersecurity attacks. However, the complexity involved in managing these technologies is emerging as a major problem. Read this report to find out what your peers biggest security challenges are and the technologies they are using to address them.
Twitter Feed
Dark Reading - Bug Report
Bug Report
Enterprise Vulnerabilities
From DHS/US-CERT's National Vulnerability Database
CVE-2020-5216
PUBLISHED: 2020-01-23
In Secure Headers (RubyGem secure_headers), a directive injection vulnerability is present in versions before 3.9.0, 5.2.0, and 6.3.0. If user-supplied input was passed into append/override_content_security_policy_directives, a newline could be injected leading to limited header injection. Upon seei...
CVE-2020-5217
PUBLISHED: 2020-01-23
In Secure Headers (RubyGem secure_headers), a directive injection vulnerability is present in versions before 3.8.0, 5.1.0, and 6.2.0. If user-supplied input was passed into append/override_content_security_policy_directives, a semicolon could be injected leading to directive injection. This could b...
CVE-2020-5223
PUBLISHED: 2020-01-23
In PrivateBin versions 1.2.0 before 1.2.2, and 1.3.0 before 1.3.2, a persistent XSS attack is possible. Under certain conditions, a user provided attachment file name can inject HTML leading to a persistent Cross-site scripting (XSS) vulnerability. The vulnerability has been fixed in PrivateBin v1.3...
CVE-2019-20399
PUBLISHED: 2020-01-23
A timing vulnerability in the Scalar::check_overflow function in Parity libsecp256k1-rs before 0.3.1 potentially allows an attacker to leak information via a side-channel attack.
CVE-2020-7915
PUBLISHED: 2020-01-22
An issue was discovered on Eaton 5P 850 devices. The Ubicacion SAI field allows XSS attacks by an administrator.