Virus:Win32/Chir.B@mm (MICROSOFT), Email-Worm.Win32.Runouce.aa (KASPERSKY)
This Virus may be dropped by other malware.
It appends its codes to target files. It infects certain file types by inserting code in the said files.
It gathers target email addresses from the Windows Address Book (WAB).
This Virus may be dropped by the following malware:
This Virus drops the following copies of itself into the affected system:
(Note: %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.)
It adds the following processes:
It adds the following mutexes to ensure that only one of its copies runs at any one time:
This Virus adds the following registry entries to enable its automatic execution at every system startup:
Runonce = "%System%\runouce.exe"
This Virus appends its codes to target files.
It infects files with the following file extensions by inserting code in the said files:
This Virus gathers target email addresses from the Windows Address Book (WAB).
It exploits an unknown vulnerability in the following software so that the attachment automatically executes when the email message is read or previewed:
This Virus does the following:
Trend Micro Predictive Machine Learning detects and blocks malware at the first sign of its existence, before it executes on your system. When enabled, your Trend Micro product detects this malware under the following machine learning name:
Before doing any scans, Windows 7, Windows 8, Windows 8.1, and Windows 10 users must disable System Restore to allow full scanning of their computers.
Remove the malware/grayware file dropped/downloaded by Virus.Win32.CHIR.B-O. (Note: Please skip this step if the threat(s) listed below have already been removed.)
Restart in Safe Mode
Delete this registry value
Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.
Restart in normal mode and scan your computer with your Trend Micro product for files detected as Virus.Win32.CHIR.B-O. If the detected files have already been cleaned, deleted, or quarantined by your Trend Micro product, no further step is required. You may opt to simply delete the quarantined files. Please check this Knowledge Base page for more information.
Scan your computer with your Trend Micro product to delete files detected as Virus.Win32.CHIR.B-O. If the detected files have already been cleaned, deleted, or quarantined by your Trend Micro product, no further step is required. You may opt to simply delete the quarantined files. Please check the following Trend Micro Support pages for more information: