{"id":158498,"date":"2021-11-19T06:51:44","date_gmt":"2021-11-19T14:51:44","guid":{"rendered":"https:\/\/www.mcafee.com\/blogs\/?p=158498"},"modified":"2025-07-29T07:53:52","modified_gmt":"2025-07-29T14:53:52","slug":"5-signs-your-device-may-be-infected-with-malware-or-a-virus","status":"publish","type":"post","link":"https:\/\/www.mcafee.com\/blogs\/ja-jp\/mobile-security\/5-signs-your-device-may-be-infected-with-malware-or-a-virus\/","title":{"rendered":"\u30c7\u30d0\u30a4\u30b9\u304c\u30a6\u30a4\u30eb\u30b9\u3084\u30de\u30eb\u30a6\u30a7\u30a2\u306b\u611f\u67d3\u3057\u305f\u5834\u5408\u306e\u75c7\u72b65\u9078"},"content":{"rendered":"

The malware landscape is rapidly becoming more complex. No matter what type of device you use (Android, iPhone, Windows, or Mac), you could be vulnerable to an external attack, or you could already be infected with malware or a virus. So how do you know if you’re infected?<\/span><\/span><\/span><\/p>\n

Hacking is on the rise<\/span><\/span><\/span><\/b><\/h2>\n

\u202f<\/span>Statistics compiled by the Identity Theft Resource Center (ITRC)<\/span><\/span><\/span><\/a> for 2021 show a 17 percent increase in reported data breaches compared to the previous year. Research conducted by McAfee also found that cybercrime is on the rise, taking advantage of the 2020 pandemic.\u202f <\/span><\/span><\/span>McAfee Labs<\/span><\/span><\/span><\/a> research found an average of 375 new threats emerging per minute, with a <\/span><\/span><\/span>surge in <\/span><\/span><\/span>hacking activities exploiting the pandemic, including phishing, malicious apps, and malware that capitalize on COVID-19. As we approach the end of the year, with sales events such as <\/span><\/span><\/span><\/a>Black Friday and Cyber Monday<\/span><\/span><\/a> , there is a possibility that new threats will emerge that take advantage of these events.\u202f<\/span><\/span><\/span><\/p>\n

Malware and viruses that infect you without you even realizing it<\/span><\/span><\/span><\/b><\/h2>\n

When a smartphone or other device is infected with a virus, it usually becomes apparent that it has been infected because the device starts to behave strangely. However, new malware and viruses can infect your device without you even realizing it. These malware and viruses can send usage information and confidential information to third parties in the background without interfering with the operation of your device. Therefore, you should be aware of the following signs:\u202f<\/span><\/span><\/span><\/p>\n

5 Signs That Your Computer Has a Malware or Virus<\/span><\/span><\/span><\/b><\/h2>\n
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  1. Your device heats up:<\/span><\/span><\/span><\/b> \u202fIf you accidentally download malware, your device’s internal components will work immediately to make the malware work, causing your device to heat up (and even overheat).\u202f<\/span><\/span><\/span><\/li>\n
  2. Slower overall device performance:<\/span><\/span><\/span><\/b> \u202fJust as natural viruses can affect the entire human body, digital viruses can affect various aspects of device performance. This means that malware can be the culprit behind a slow or sluggish phone. For example, symptoms of a malware infection include slower website loading speeds, app crashes, and an inability to charge the battery. In these cases, the overall slowdown in your device persists, even after rebooting or deleting large files.\u202f<\/span><\/span><\/span><\/li>\n
  3. Increased random popups and new app installations:<\/span><\/span><\/span><\/b> Another symptom of a virus infection on your phone is the increased number of random popups you see, or apps you don’t remember downloading that appear in your app library.\u202f<\/span><\/span><\/span><\/li>\n
  4. Malicious links sent from your account:<\/span><\/span><\/span><\/b> \u202fIt’s common for malware to access your contact list and send messages to friends from your phone. This is a powerful way to spread malware between users. While email is one way to do it, sending malicious links from social media accounts is a more common method. If you notice this infection vector, you should immediately change your passwords and scan all your devices for malware running in the background.<\/span><\/span><\/span><\/li>\n
  5. Unknown charges on your statement:<\/span><\/span><\/span><\/b> \u202fIf you notice charges on your credit card or bank statement that you don’t recognize, it’s worth investigating further. They could be a sign of a malicious app making purchases on your behalf, or malware that uses your personal information to make fraudulent purchases.<\/span><\/span><\/span><\/li>\n<\/ol>\n

    How to protect your device<\/span><\/span><\/span><\/b><\/h2>\n