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The Cyber Swiss Army Knife [A Web App For Encryption, Encoding, Compression And Data Analysis] - CyberChef

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The Cyber Swiss Army Knife

CyberChef is a simple, intuitive web app for carrying out all manner of "cyber" operations within a web browser. These operations include simple encoding like XOR or Base64, more complex encryption like AES, DES and Blowfish, creating binary and hexdumps, compression and decompression of data, calculating hashes and checksums, IPv6 and X.509 parsing, changing character encodings, and much more.

The tool is designed to enable both technical and non-technical analysts to manipulate data in complex ways without having to deal with complex tools or algorithms. It was conceived, designed, built and incrementally improved by an analyst in their 10% innovation time over several years. Every effort has been made to structure the code in a readable and extendable format, however it should be noted that the analyst is not a professional developer.

Live demo

CyberChef is still under active development. As a result, it shouldn't be considered a finished product. There is still testing and bug fixing to do, new features to be added and additional documentation to write. Please contribute!

Cryptographic operations in CyberChef should not be relied upon to provide security in any situation. No guarantee is offered for their correctness.

A live demo can be found here - have fun!

How it works

There are four main areas in CyberChef:

The input box in the top right, where you can paste, type or drag the data you want to operate on.
The output box in the bottom right, where the outcome of your processing will be displayed.
The operations list on the far left, where you can find all the operations that CyberChef is capable of in categorised lists, or by searching.
The recipe area in the middle, where you can drag the operations that you want to use and specify arguments and options.

You can use as many operations as you like in simple or complex ways. Some examples are as follows:

Features

Drag and drop
- Operations can be dragged in and out of the recipe list, or reorganised.
- Files can be dragged over the input box to load them directly.
Auto Bake
- Whenever you modify the input or the recipe, CyberChef will automatically “bake” for you and produce the output immediately.
- This can be turned off and operated manually if it is affecting performance (if the input is very large, for instance).
- If any bake takes longer than 200 milliseconds, auto bake will be switched off automatically to prevent further performance issues.
Breakpoints
- You can set breakpoints on any operation in your recipe to pause execution before running it.
- You can also step through the recipe one operation at a time to see what the data looks like at each stage.
Save and load recipes
- If you come up with an awesome recipe that you know you’ll want to use again, just click save and add it to your local storage. It'll be waiting for you next time you visit CyberChef.
- You can also copy a URL which includes your recipe and input which can be shared with others.
Search
- If you know the name of the operation you want or a word associated with it, start typing it into the search field and any matching operations will immediately be shown.
Highlighting
- When you highlight text in the input or output, the offset and length values will be displayed and, if possible, the corresponding data will be highlighted in the output or input respectively (example: highlight the word 'question' in the input to see where it appears in the output).
Save to file and load from file
- You can save the output to a file at any time or load a file by dragging and dropping it into the input field (note that files larger than about 500kb may cause your browser to hang or even crash due to the way that browsers handle large amounts of textual data).
CyberChef is entirely client-side
- It should be noted that none of your input or recipe configuration is ever sent to the CyberChef web server - all processing is carried out within your browser, on your own computer.
- Due to this feature, CyberChef can be compiled into a single HTML file. You can download this file and drop it into a virtual machine, share it with other people, or use it independently on your desktop.

Browser support

CyberChef is built to support

Google Chrome 40+
Mozilla Firefox 35+
Microsoft Edge 14+

Download CyberChef

Petya Ransomware Spreading Rapidly Worldwide, Just Like WannaCry - News

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Watch out, readers! It is ransomware, another WannaCry, another wide-spread attack.

The WannaCry ransomware is not dead yet and another large scale ransomware attack is making chaos worldwide, shutting down computers at corporates, power supplies, and banks across Russia, Ukraine, Spain, France, UK, India, and Europe and demanding $300 in bitcoins.

According to multiple sources, a new variant of Petya ransomware, also known as Petwrap, is spreading rapidly with the help of same Windows SMBv1 vulnerability that the WannaCry ransomware abused to infect 300,000 systems and servers worldwide in just 72 hours last month.

Apart from this, many victims have also informed that Petya ransomware has also infected their patch systems.

"Petya uses the NSA Eternalblue exploit but also spreads in internal networks with WMIC and PSEXEC. That's why patched systems can get hit." Mikko Hypponen confirms, Chief Research Officer at F-Secure.

Petya is a nasty piece of ransomware and works very differently from any other ransomware malware. Unlike other traditional ransomware, Petya does not encrypt files on a targeted system one by one.

Instead, Petya reboots victims computers and encrypts the hard drive's master file table (MFT) and renders the master boot record (MBR) inoperable, restricting access to the full system by seizing information about file names, sizes, and location on the physical disk.

Petya ransomware replaces the computer's MBR with its own malicious code that displays the ransom note and leaves computers unable to boot.

Don't Pay Ransom, You Wouldn’t Get Your Files Back

Infected users are advised not to pay the ransom because hackers behind Petya ransomware can’t get your emails anymore.

Posteo, the German email provider, has suspended the email address i.e. wowsmith123456@posteo.net, which was behind used by the criminals to communicate with victims after getting the ransom to send the decryption keys.

At the time of writing, 23 victims have paid in Bitcoin to '1Mz7153HMuxXTuR2R1t78mGSdzaAtNbBWX' address for decrypting their files infected by Petya, which total roughly $6775.

Petya! Petya! Another Worldwide Ransomware Attack

Petya Ransomware Spreading Rapidly Worldwide, Just Like WannaCry

Screenshots of the latest Petya infection, shared on Twitter, shows that the ransomware displays a text, demanding $300 worth of Bitcoins. Here's what the text read:

"If you see this text, then your files are no longer accessible, because they are encrypted. Perhaps you are busy looking for a way to recover your files, but don't waste your time. Nobody can recover your files without our decryption service."

According to a recent VirusTotal scan, currently, only 16 out of 61 anti-virus services are successfully detecting the Petya ransomware malware.

Petya Ransomware Hits Banks, Telecom, Businesses & Power Companies

Supermarket in Kharkiv, East Ukraine

Petya ransomware has already infected — Russian state-owned oil giant Rosneft, Ukrainian state electricity suppliers, "Kyivenergo" and "Ukrenergo," in past few hours.

"We were attacked. Two hours ago, we had to turn off all our computers. We are waiting for permission from Ukraine's Security Service (SBU) to switch them back on," Kyivenergo's press service said.

There are reports from several banks, including National Bank of Ukraine (NBU) and Oschadbank, as well as other companies confirming they have been hit by the Petya ransomware attacks.

Maersk, an international logistics company, has also confirmed on Twitter that the latest Petya ransomware attacks have shut down its IT systems at multiple locations and business units.

"We can confirm that Maersk IT systems are down across multiple sites and business units. We are currently asserting the situation. The safety of our employees, our operations and customers' business is our top priority. We will update when we have more information," the company said.

The ransomware also impacts multiple workstations at Ukrainian branch's mining company Evraz.

The most severe damages reported by Ukrainian businesses also include compromised systems at Ukraine's local metro and Kiev's Boryspil Airport.

Three Ukrainian telecommunication operators, Kyivstar, LifeCell, Ukrtelecom, are also affected in the latest Petya attack.

How Petya Ransomware Spreading So Fast?

Symantec, the cyber security company, has also confirmed that Petya ransomware is exploiting SMBv1 EternalBlue exploit, just like WannaCry, and taking advantage of unpatched Windows machines.

"Petya ransomware successful in spreading because it combines both a client-side attack (CVE-2017-0199) and a network based threat (MS17-010)," security researcher using Twitter handle ‏HackerFantastic tweeted.

EternalBlue is a Windows SMB exploit leaked by the infamous hacking group Shadow Brokers in its April data dump, who claimed to have stolen it from the US intelligence agency NSA, along with other Windows exploits.

Microsoft has since patched the vulnerability for all versions of Windows operating systems, but many users remain vulnerable, and a string of malware variants are exploiting the flaw to deliver ransomware and mine cryptocurrency.

Just three days ago, we reported about the latest WannaCry attack that hit Honda Motor Company and around 55 speed and traffic light cameras in Japan and Australia, respectively.

Well, it is quite surprising that even after knowing about the WannaCry issue for quite a decent amount of time, big corporates and companies have not yet implemented proper security measures to defend against such threat.

How to Protect Yourself from Ransomware Attacks

What to do immediately? Go and apply those goddamn patches against EternalBlue (MS17-010) and disable the unsecured, 30-year-old SMBv1 file-sharing protocol on your Windows systems and servers.

Since Petya Ransomware is also taking advantage of WMIC and PSEXEC tools to infect fully-patched Windows computers, you are also advised to disable WMIC (Windows Management Instrumentation Command-line).

Prevent Infection & Petya Kill-Switch

Researcher finds Petya ransomware encrypt systems after rebooting the computer. So if your system is infected with Petya ransomware and it tries to restart, just do not power it back on.

"If machine reboots and you see this message, power off immediately! This is the encryption process. If you do not power on, files are fine." ‏HackerFantastic tweeted. "Use a LiveCD or external machine to recover files"

PT Security, a UK-based cyber security company and Amit Serper from Cybereason, have discovered a Kill-Switch for Petya ransomware. According to a tweet, company has advised users to create a file i.e. "C:\Windows\perfc" to prevent ransomware infection.

To safeguard against any ransomware infection, you should always be suspicious of unwanted files and documents sent over an email and should never click on links inside them unless verifying the source.

To always have a tight grip on your valuable data, keep a good back-up routine in place that makes their copies to an external storage device that isn't always connected to your PC.

Moreover, make sure that you run a good and effective anti-virus security suite on your system, and keep it up-to-date. Most importantly, always browse the Internet safely.

Source: The Hacker News

OffensiveSec

WannaCry Ransomware Decryption Tool - WanaKiwi

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If your PC has been infected by WannaCry – the ransomware that wreaked havoc across the world last Friday – you might be lucky to get your locked files back without paying the ransom of $300 to the cyber criminals.

Adrien Guinet, a French security researcher from Quarkslab, has discovered a way to retrieve the secret encryption keys used by the WannaCry ransomware for free, which works on Windows XP, Windows 7, Windows Vista, Windows Server 2003 and 2008 operating systems.

WannaCry Ransomware Decryption Keys

The WannaCry's encryption scheme works by generating a pair of keys on the victim's computer that rely on prime numbers, a "public" key and a "private" key for encrypting and decrypting the system’s files respectively.
To prevent the victim from accessing the private key and decrypting locked files himself, WannaCry erases the key from the system, leaving no choice for the victims to retrieve the decryption key except paying the ransom to the attacker.

But here's the kicker: WannaCry "does not erase the prime numbers from memory before freeing the associated memory," says Guinet.

Based on this finding, Guinet released a WannaCry ransomware decryption tool, named WannaKey, that basically tries to retrieve the two prime numbers, used in the formula to generate encryption keys from memory, and works on Windows XP only.

Note: Below I have also mentioned another tool, dubbed WanaKiwi, that works for Windows XP to Windows 7.

"It does so by searching for them in the wcry.exe process. This is the process that generates the RSA private key. The main issue is that the CryptDestroyKey and CryptReleaseContext does not erase the prime numbers from memory before freeing the associated memory." says Guinet

So, that means, this method will work only if:

The affected computer has not been rebooted after being infected.
The associated memory has not been allocated and erased by some other process.

"In order to work, your computer must not have been rebooted after being infected. Please also note that you need some luck for this to work (see below), and so it might not work in every case!," Guinet says.

"This is not really a mistake from the ransomware authors, as they properly use the Windows Crypto API."
While WannaKey only pulls prime numbers from the memory of the affected computer, the tool can only be used by those who can use those prime numbers to generate the decryption key manually to decrypt their WannaCry-infected PC’s files.

WanaKiwi: WannaCry Ransomware Decryption Tool

Good news is that another security researcher, Benjamin Delpy, developed an easy-to-use tool called "WanaKiwi," based on Guinet's finding, which simplifies the whole process of the WannaCry-infected file decryption.

All victims have to do is download WanaKiwi tool from Github and run it on their affected Windows computer using the command line (cmd).

WanaKiwi works on Windows XP, Windows 7, Windows Vista, Windows Server 2003 and 2008, confirmed Matt Suiche from security firm Comae Technologies, who has also provided some demonstrations showing how to use WanaKiwi to decrypt your files.

Although the tool won't work for every user due to its dependencies, still it gives some hope to WannaCry's victims of getting their locked files back for free even from Windows XP, the aging, largely unsupported version of Microsoft's operating system.

Source:The Hacker News

Download WanaKiwi

Secure Anonymous File Sharing - OnionShare

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