Sourcenext's 'Viruses Actually Detected in Japan' July 2026 Edition
Software retailer Sourcenext compiles and periodically publishes information on viruses actually detected in Japan by its antivirus products.
The information released this time is the **'Viruses Currently Spreading in Japan' for July 2026**.
The data is compiled by Bitdefender, the developer of the technology used in Sourcenext's security products. The collection period is June 25 to July 25, 2026.
What makes this information interesting is that it doesn't just say 'be careful of viruses,' but shows what is actually being detected in Japan.
Viruses frequently detected on Windows
The top 5 threats detected by Sourcenext's 'Super Security' are as follows:
Generic.Application.JS.Locker.A
JS:Trojan.Scam.QD
Trojan.GenericFCA.8739
Trojan.GenericKD.80150970
Generic.Application.JS.Locker.A.1CDC4390
This time, Sourcenext is highlighting the third most common threat, **'Trojan.GenericFCA.8739'**.
What is 'Trojan.GenericFCA.8739'?
Rather than a name referring to one specific type of virus, this is a generic detection name used when a suspicious file with characteristics similar to a Trojan horse is detected.
Trojans can infiltrate devices by masquerading as legitimate software or files, and may execute malicious programs without the user's knowledge.
However, it is not possible to determine exactly what the file does based solely on the detection name 'Trojan.GenericFCA.8739'.
This is because the actual behavior, such as stealing information or downloading other malware, varies depending on the detected file.
Countermeasures to keep in mind for Windows
Sourcenext lists the following as basic countermeasures:
・Do not easily open suspicious files attached to emails ・Do not carelessly click on URLs from unknown senders ・Do not download files from untrusted websites ・Keep Windows, browsers, and software in use up to date ・Keep security software up to date at all times ・If a suspicious file is detected, do not execute it; quarantine or delete it ・Perform a full system scan after detection
While these are not flashy countermeasures, in the end, it is important to accumulate these basic actions.
Beware of 'Riskware targeting SMS' on Android
The top 5 most detected items by 'Smartphone Security' for Android smartphones and tablets are as follows.
Android.Riskware.TestKey.rA
Android.Riskware.SmsSpy.LL
Android.Riskware.Agent.aEKMQ
Android.Riskware.SpyAgent.OR
Android.Riskware.Agent.JUS
Among these, the one highlighted this time is the second most detected, "Android.Riskware.SmsSpy.LL".
Why is it dangerous if SMS is stolen?
This riskware has the potential to leak personal information and authentication credentials by reading the contents of SMS or sending them externally.
You should be especially careful about the authentication codes sent via SMS from online services and the like.
If an attacker obtains not only your ID and password but also your SMS authentication code, they could combine them to gain unauthorized access to your online services.
Furthermore, it is said that there is a risk that it may operate without the user noticing and send information regarding SMS and the device to the outside.
Countermeasures to keep in mind for Android
Sourcenext recommends the following countermeasures:
・Obtain apps from trusted sources such as Google Play. ・Do not easily install apps or APK files from unknown sources. ・Check the requested permissions when installing an app. ・Do not grant permissions that are disproportionate to the app's functionality, such as SMS, phone, or location information. ・Keep the Android OS and security apps up to date. ・If a suspicious app is detected, delete it immediately.
Sourcenext's initiative to report 'actually detected threats'
What is noteworthy about this information is that it is not a general theory that 'such viruses exist,' but rather that the information is published based on the results actually detected in Japan by Sourcenext's security products.
When we hear about cyberattacks, we tend to imagine highly sophisticated and special attacks, but looking at the countermeasures introduced this time,
"Do not open suspicious files"
"Do not install unknown apps"
"Keep your OS and software updated"
"Check app permissions"
It is clear that everyday security measures such as these remain essential.
In particular, Android 'riskware that reads SMS' cannot be ignored by those who use SMS authentication.
SourceNext continuously publishes these domestic detection trends as a 'Detected Virus Report' and makes past information available for review.
When we think of security measures, we tend to focus on the products themselves, butknowing what threats are actually being detected is also a form of defense, one could say.