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Ultimo Ransomware

Posted: September 12, 2017

Threat Metric

Threat Level: 10/10
Infected PCs: 13
First Seen: September 13, 2017
OS(es) Affected: Windows

The Ultimo Ransomware is a file-locking Trojan built from the Hidden Tear's source code. The Ultimo Ransomware can make your files, such as documents, illegible by encrypting them, and also creates messages asking you to pay for their recovery. Users should run their anti-malware programs to disinfect their PCs and delete the Ultimo Ransomware before resorting to free decryption solutions from trusted security organizations to unlock any media as necessary.

One Trojan's Imperfect Union

A threat actor with the user profile name of 'Daniel' is designing another version of Hidden Tear with the apparent intent of deploying it against the public. This Trojan, the Ultimo Ransomware, includes a mixture of unique and misappropriated branding, along with a sharp limitation on how long the victim has to respond. The Trojan's attacks encode the media of infected PCs before asking for payments in crypto currency, similarly to most versions of Hidden Tear.

The Ultimo Ransomware disguises itself as a fake Western Union tracking number (or MTCN), which Daniel may be attaching to instant messages or email spam currently. A successful installation lets the Ultimo Ransomware begin encoding media such as documents, pictures, spreadsheets, or archives with an AES-based algorithm. Then, it creates a Notepad file that it places on the user's Windows desktop directly.

The Ultimo Ransomware text instructions give the victim a working ID number, a Bitcoin wallet address for receiving payments, and static extortion values of 0.022 Bitcoins within two days. Both the cheapness of the Ultimo Ransomware's ransom (under one hundred USD in value) and the terseness of its pay timing make it more likely than not that 'Daniel' intends to attack recreational users, rather than workplace environments. The note is in English, although many threat actors default to that language for achieving maximal compatibility for a minimum of work. Malware experts also noticed unusual formatting choices in the Ultimo Ransomware's message such as embedded hyperlinks and a non-standard background coloration.

The Ultimate in Removing the Ultimo Ransomware's Potential for Financing

All file-locking threats, regardless of their origins, can be defended against by users keeping their valuable media in inaccessible, protected locations. For such purposes, malware researchers recommend external storage devices that can be left unattached to all network-accessible systems particularly. For situations without any backups available, victims should consider testing copies of any locked content with Hidden Tear decryptors that can reverse-engineer the Ultimo Ransomware's cipher.

Even in these initial stages of its operations, the Ultimo Ransomware also provides a clear idea of how its author plans to circulate it. Fake invoices, memos, and other content related to financial transactions are often responsible for distributing the file-locking Trojans of many families. Always scan any potentially compromised downloads, such as email attachments so that your anti-malware programs can remove the Ultimo Ransomware before it begins attacking your files.

There are always two sides to blame in a lapse in the safety of your PC: the remote attacker and the user who's taking insufficient security measures. Confirming whether or not a document is what it claims to be before opening it is a step that can prevent the Ultimo Ransomware from turning your negligence into its money.

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