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Pytehole Ransomware

Posted: April 27, 2017

Threat Metric

Threat Level: 10/10
Infected PCs: 7
First Seen: April 27, 2017
Last Seen: April 18, 2018
OS(es) Affected: Windows


The Pytehole Ransomware is an open-source Trojan that independent threat actors may modify for delivering to their victims, including potential dropping custom extortion demands, in addition to locking your files. Current versions of the Pytehole Ransomware only encrypt your local content and may block you from opening documents and similar media. Dedicated anti-malware products can block or delete the Pytehole Ransomware at any phase of an attempted infection, and rigorous habits in backing up your files can lower the possible damage it can cause.

A Ten-Year Hole with Trojans Hidden at the Bottom

While the development and deployment cycles of threatening software can be very rapid, con artists sometimes are happy to use old resources for launching threat campaigns in the present day. A particularly well-aged example comes through pasmik.net, a decade-old site verifiable by malware experts recently as having Command & Control connections with a modern, file-encrypting threat. The file-locking Trojan, the Pytehole Ransomware, is not yet in distribution to any targets apparently but does possess a payload that's able to block various files automatically, in perpetuity.

The available samples of the Pytehole Ransomware don't try to communicate with their victims by dropping ransom notes, hijacking the desktop's wallpaper, or even leaving contact data in the filenames of any content they encrypt. The Pytehole Ransomware does create a 'pyteHole' mutex entry to prevent multiple instances of itself from running, from which it derives its name. The code included immediately afterward supports the Pytehole Ransomware's primary attack: a combination of the AES and RSA encryptions.

Without mistakes made by the programmers, this asymmetric encoding method is challenging and sometimes impossible, to crack. Trojans like the Pytehole Ransomware may use it to block different, specified types of data, almost always including documents, pictures, spreadsheets, archives, and other, work-related media. Malware experts did verify the Pytehole Ransomware's using '.adr' extensions for tagging every affected file, which could facilitate determining what content is under its lock-down.

Burying an Open-Air Trojan before It Becomes Everyone's Problem

Other industry experts postulate that once further information is acquired, the Pytehole Ransomware's C&C network could be subject to termination by the hosting company. While doing so would limit the potential deployment of this threat, this Trojan is an open-source threat and may be subjected to additional modifications from different threat actors. Infection vectors most likely of implication in a the Pytehole Ransomware campaign include e-mail attachments, Web browser-based exploits, and brute-force attacks against systems maintaining poor passwords.

Most file-encrypting threats are identifiable thanks to the messages they deliver to their victims, either via graphical images or text. The Pytehole Ransomware doesn't include these features, by default, and may show no symptoms other than having blocked your local files and added its personal extension to the end of their names. Recovery may be impossible without backups, which malware experts recommend restoring from, once your anti-malware protection removes the Pytehole Ransomware.

At present, the Pytehole Ransomware is a poised security issue that has yet to strike. If users continue practicing safe Web-browsing behavior and minding their password security, one can hope that the Pytehole Ransomware will remain a theoretical problem that never triggers in fact.

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