Home Malware Programs Potentially Unwanted Programs (PUPs) 1stBrowser

1stBrowser

Posted: June 4, 2015

Threat Metric

Ranking: 9,018
Threat Level: 1/10
Infected PCs: 8,076
First Seen: May 26, 2015
Last Seen: October 9, 2023
OS(es) Affected: Windows

1stBrowser is a free software created and developed by SIEN S.A. that is marketed as the best browser for chatting, downloading, shopping, etc. 1stBrowser claims to provide users with plenty of conveniences. 1st Browser offers a social sidebar to stay connected and also claims to save money and time while being a user-friendly application. However, 1stBrowser is classified as a Potentially Unwanted Program (PUP) that has adware capabilities. In reality, 1stBrowser is a misleading application and users might easily be tricked into downloading it from their official website at 1stBrowser.com. However, adware creators also utilize questionable delivery methods such as bundling 1stBrowser with other freeware. Either way, once 1stBrowser has infiltrated your computer, you may notice plenty of advertisements. At first glance, 1stBrowser ads may seem appealing, but in reality, they are tailored and based on your browsing history. Also, 1stBrowser is not a reliable web browser as it constantly keeps track of your activities and utilizes this information for marketing purposes. Computer security experts advise users to remove 1stBrowser using a trusted anti-malware product.

Technical Details

Registry Modifications

The following newly produced Registry Values are:

File name without path1stBrowser.lnkRegexp file mask%WINDIR%\System32\Tasks\1stbrowserHKEY..\..\..\..{RegistryKeys}Software\1stBrowserSOFTWARE\Classes\.gif\OpenWithProgids\1stBrowHTM.7FK27EPBSU3G7VAQT43UZVCK74SOFTWARE\Classes\.gif\OpenWithProgids\1stBrowHTM.NSJA6BHDA3NCFCFMXW3QSCUYUQSOFTWARE\Classes\.htm\OpenWithProgIds\1stBrowHTM.7FK27EPBSU3G7VAQT43UZVCK74SOFTWARE\Classes\.htm\OpenWithProgIds\1stBrowHTM.NSJA6BHDA3NCFCFMXW3QSCUYUQSOFTWARE\Classes\.html\OpenWithProgIds\1stBrowHTM.7FK27EPBSU3G7VAQT43UZVCK74SOFTWARE\Classes\.html\OpenWithProgIds\1stBrowHTM.NSJA6BHDA3NCFCFMXW3QSCUYUQSOFTWARE\Classes\.jpeg\OpenWithProgids\1stBrowHTM.7FK27EPBSU3G7VAQT43UZVCK74SOFTWARE\Classes\.jpeg\OpenWithProgids\1stBrowHTM.NSJA6BHDA3NCFCFMXW3QSCUYUQSOFTWARE\Classes\.jpg\OpenWithProgids\1stBrowHTM.7FK27EPBSU3G7VAQT43UZVCK74SOFTWARE\Classes\.jpg\OpenWithProgids\1stBrowHTM.NSJA6BHDA3NCFCFMXW3QSCUYUQSOFTWARE\Classes\.pdf\OpenWithProgids\1stBrowHTM.7FK27EPBSU3G7VAQT43UZVCK74SOFTWARE\Classes\.pdf\OpenWithProgids\1stBrowHTM.NSJA6BHDA3NCFCFMXW3QSCUYUQSOFTWARE\Classes\.png\OpenWithProgids\1stBrowHTM.7FK27EPBSU3G7VAQT43UZVCK74SOFTWARE\Classes\.png\OpenWithProgids\1stBrowHTM.NSJA6BHDA3NCFCFMXW3QSCUYUQSOFTWARE\Classes\.shtml\OpenWithProgids\1stBrowHTM.7FK27EPBSU3G7VAQT43UZVCK74SOFTWARE\Classes\.shtml\OpenWithProgids\1stBrowHTM.NSJA6BHDA3NCFCFMXW3QSCUYUQSOFTWARE\Classes\.webp\OpenWithProgids\1stBrowHTM.7FK27EPBSU3G7VAQT43UZVCK74SOFTWARE\Classes\.webp\OpenWithProgids\1stBrowHTM.NSJA6BHDA3NCFCFMXW3QSCUYUQSOFTWARE\Classes\.xht\OpenWithProgIds\1stBrowHTM.7FK27EPBSU3G7VAQT43UZVCK74SOFTWARE\Classes\.xht\OpenWithProgIds\1stBrowHTM.NSJA6BHDA3NCFCFMXW3QSCUYUQSOFTWARE\Classes\.xhtml\OpenWithProgIds\1stBrowHTM.7FK27EPBSU3G7VAQT43UZVCK74SOFTWARE\Classes\.xhtml\OpenWithProgIds\1stBrowHTM.NSJA6BHDA3NCFCFMXW3QSCUYUQSoftware\Classes\CLSID\BE990DFE-888B-46D7-86D7-877F219F2CE6Software\Classes\Wow6432Node\CLSID\BE990DFE-888B-46D7-86D7-877F219F2CE6SOFTWARE\Microsoft\MediaPlayer\ShimInclusionList\1stbrowser.exeSOFTWARE\Microsoft\Windows NT\CurrentVersion\Schedule\TaskCache\Tree\1stbrowserSOFTWARE\Microsoft\Windows\CurrentVersion\App Paths\1stbrowser.exeSoftware\Microsoft\Windows\CurrentVersion\Explorer\FileExts\.gif\OpenWithProgids\1stBrowHTM.NSJA6BHDA3NCFCFMXW3QSCUYUQSoftware\Microsoft\Windows\CurrentVersion\Explorer\FileExts\.htm\OpenWithProgids\1stBrowHTM.NSJA6BHDA3NCFCFMXW3QSCUYUQSoftware\Microsoft\Windows\CurrentVersion\Explorer\FileExts\.html\OpenWithProgids\1stBrowHTM.NSJA6BHDA3NCFCFMXW3QSCUYUQSoftware\Microsoft\Windows\CurrentVersion\Explorer\FileExts\.jpeg\OpenWithProgids\1stBrowHTM.NSJA6BHDA3NCFCFMXW3QSCUYUQSoftware\Microsoft\Windows\CurrentVersion\Explorer\FileExts\.jpg\OpenWithProgids\1stBrowHTM.NSJA6BHDA3NCFCFMXW3QSCUYUQSoftware\Microsoft\Windows\CurrentVersion\Explorer\FileExts\.png\OpenWithProgids\1stBrowHTM.NSJA6BHDA3NCFCFMXW3QSCUYUQSoftware\Microsoft\Windows\CurrentVersion\Explorer\FileExts\.shtml\OpenWithProgids\1stBrowHTM.NSJA6BHDA3NCFCFMXW3QSCUYUQSoftware\Microsoft\Windows\CurrentVersion\Run\1stbrowserSOFTWARE\RegisteredApplications\1stBrowser.7FK27EPBSU3G7VAQT43UZVCK74SOFTWARE\RegisteredApplications\1stBrowser.NSJA6BHDA3NCFCFMXW3QSCUYUQSOFTWARE\Wow6432Node\Microsoft\MediaPlayer\ShimInclusionList\1stbrowser.exeSOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\App Paths\1stbrowser.exeSOFTWARE\Wow6432Node\RegisteredApplications\1stBrowser.7FK27EPBSU3G7VAQT43UZVCK74SOFTWARE\Wow6432Node\RegisteredApplications\1stBrowser.NSJA6BHDA3NCFCFMXW3QSCUYUQHKEY_LOCAL_MACHINE\Software\[APPLICATION]\Microsoft\Windows\CurrentVersion\Uninstall..{Uninstaller}1stBrowser

Additional Information

The following directories were created:
%LOCALAPPDATA%\1stBrowser%UserProfile%\Local Settings\Application Data\1stBrowserUninstall%appdata%\Microsoft\Windows\Start Menu\Programs\1stBrowser
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