Yyto Ransomware

Posted: May 31, 2017

Threat Metric

The Threat Meter is a malware assessment that SpywareRemove.com's research team is able to give every identifiable malware threat. Our Threat Meter includes several criteria based off of specific malware threats to value their severity, reach and volume. The Threat Meter is able to give you a numerical breakdown of each threat's initial Threat Level, Detection Count, Volume Count, Trend Path and Percentage Impact. The overall ranking of each threat in the Threat Meter is a basic breakdown of how all threats are ranked within our own extensive malware database. The scoring for each specific malware threat can be easily compared to other emerging threats to draw a contrast in its particular severity. The Threat Meter is a useful tool in the endeavor of seeking a solution to remove a threat or pursue additional analytical research for all types of computer users.

The following fields listed on the Threat Meter containing a specific value, are explained in detail below:

Threat Level: The threat level scale goes from 1 to 10 where 10 is the highest level of severity and 1 is the lowest level of severity. Each specific level is relative to the threat's consistent assessed behaviors collected from SpyHunter's risk assessment model.

Detection Count: The collective number of confirmed and suspected cases of a particular malware threat. The detection count is calculated from infected PCs retrieved from diagnostic and scan log reports generated by SpyHunter.

Volume Count: Similar to the detection count, the Volume Count is specifically based on the number of confirmed and suspected threats infecting systems on a daily basis. High volume counts usually represent a popular threat but may or may not have infected a large number of systems. High detection count threats could lay dormant and have a low volume count. Criteria for Volume Count is relative to a daily detection count.

Trend Path: The Trend Path, utilizing an up arrow, down arrow or equal symbol, represents the level of recent movement of a particular threat. Up arrows represent an increase, down arrows represent a decline and the equal symbol represent no change to a threat's recent movement.

% Impact (Last 7 Days): This demonstrates a 7-day period change in the frequency of a malware threat infecting PCs. The percentage impact correlates directly to the current Trend Path to determine a rise or decline in the percentage.

Threat Level:	10/10
Infected PCs:	71

First Seen:	May 31, 2017
OS(es) Affected:	Windows

The Yyto Ransomware is a Trojan that tries to extort payments from its victims after locking their files. Unlocking your content with a decryptor may be possible but is less reliable than having backups to allow you to restore all files without needing to break the Yyto Ransomware's cipher. For most users, up-to-date anti-malware protection should let them delete the Yyto Ransomware before any file-blocking behavior occurs.

Trojans Riding on the Back of Forged Mail

File-encoding Trojans aren't difficult to program necessarily but may be difficult to distribute to targets that can pay the expensive ransoms con artists often crave. With most Trojan campaigns, the threat actors work around any security barriers by employing their victims in the infection process indirectly, such as by disguising their files as safe ones. One method malware experts see recurring weekly is that of spam e-mail campaigns promoting threats like the Yyto Ransomware.

The first attacks by the Yyto Ransomware's threat actors appear to date to the last week of May. The Yyto Ransomware infections strongly correlate with forged e-mail messages, including ones using harvested contact information to disguise their corrupted links and attachments. However, unlike most threats installed via e-mail, the Yyto Ransomware also is verifiable by malware experts for attacking non-business systems, such as university networks and recreational computers.

When it gains access to a compatible Windows PC, the Yyto Ransomware scans for documents and other, similarly 'personal' formats of data, and encrypts them with a custom cipher. A supporting function of the attack also appends the 'yyto' extension at the end of every filename along with the name of the Yyto Ransomware's ransom note. This text message redirects any readers to a TOR-based e-mail service for paying to unlock the content.

Kicking out a Fake Windows Program before Damage is Done

Besides its relationship with the suspicious e-mail activities that may be installing it or enabling further attacks, malware researchers also confirm the Yyto Ransomware for using Windows component-based disguises. Victims should look for unusual behavior from supposedly standard OS files or processes, in particular, svchost.exe. However, symptoms may be sporadic or entirely non-visible until after a file-encrypting Trojan finishes encoding its targets.

Research into the Yyto Ransomware's encryption methodology, and whether it's susceptible to decoding for free, is incomplete. For anyone uninterested in taking the risk of losing their files or paying ransoms to retrieve them, malware researchers advise keeping backups on another device heavily. Anti-malware products also can be updated to optimize their ability to delete the Yyto Ransomware before an infection.

Many Trojans with encryption-based payloads use TOR to protect the identities of their threat actors. With attacks like the Yyto Ransomware's campaign only increasing that emphasis and the protection for their makers, a victim's best safeguards remain the ones based on foresight.

Technical Details

File System Modifications

Tutorials: If you wish to learn how to remove malware components manually, you can read the tutorials on how to find malware, kill unwanted processes, remove malicious DLLs and delete other harmful files. Always be sure to back up your PC before making any changes.

The following files were created in the system:

7d9905b31f8a7c607c5b901690f77ae2

File name: 7d9905b31f8a7c607c5b901690f77ae2
Size: 446.46 KB (446464 bytes)
MD5: 7d9905b31f8a7c607c5b901690f77ae2
Detection count: 96
Group: Malware file
Last Updated: May 31, 2017