Trojan:Win32/Grymegat.A
Posted: January 30, 2013
Threat Metric
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: | 9/10 |
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Infected PCs: | 30 |
First Seen: | January 30, 2013 |
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OS(es) Affected: | Windows |
Trojan:Win32/Grymegat.A is a ransomware Trojan that locks a targeted computer and displays a webpage including a bogus full-screen image/alert that covers the whole desktop. The fake pop-up notification distributed by Trojan:Win32/Grymegat.A pretends to come from a legal institution, such as the Federal Bureau of Investigation (FBI), and accuses PC users of the imaginary downloading and spreading of illegal material. Trojan:Win32/Grymegat.A demands a ransom from victims to be paid via the legitimate payment and financial transfer service Green Dot MoneyPak to unlock the computer. Trojan:Win32/Grymegat.A can make system changes to the infected computer that make it difficult for a PC user to download, install, run, or update anti-virus software. Once installed, Trojan:Win32/Grymegat.A makes system changes by dropping potentially malicious files and modifying the Windows Registry. Trojan:Win32/Grymegat.A creates the registry entries that allow it to run its copy automatically every time you start Windows. Trojan:Win32/Grymegat.A avoids Windows Firewall so that it can create a connection to another computer system. Trojan:Win32/Grymegat.A does this by inserting itself to the list of legitimate programs that can avoid Firewall. Trojan:Win32/Grymegat.A ends several Windows system-related processes if they are presently running on the victimized computer system.
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:file.exe
File name: file.exeSize: 103.93 KB (103936 bytes)
MD5: 003269da2732b6132acd9bc21f55bb2b
Detection count: 22
File type: Executable File
Mime Type: unknown/exe
Group: Malware file
Last Updated: February 11, 2013
file.exe
File name: file.exeSize: 135.16 KB (135168 bytes)
MD5: 2b6ffa9e8099933a2f61b2cf2f8704bd
Detection count: 21
File type: Executable File
Mime Type: unknown/exe
Group: Malware file
Last Updated: February 11, 2013
%SystemDrive%\recycler\find_me.tmp
File name: %SystemDrive%\recycler\find_me.tmpFile type: Temporary File
Mime Type: unknown/tmp
Group: Malware file
Registry Modifications
HKEY..\..\{Value}HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run "Update" = "%APPDATA%\System\winlogon.exe"HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run "Update" = "%APPDATA%\System\winlogon.exe"HKEY_LOCAL_MACHINE\Software\Microsoft\Windows NT\CurrentVersion\Winlogon "Shell" = "explorer.exe, %APPDATA%\System\winlogon.exe"HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run "Update" = "%APPDATA%\System\winlogon.exe"HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List "%APPDATA%\System\winlogon.exe" = "%APPDATA%\System\winlogon.exe:*:enabled:winlogon.exe"
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