PCK.MEW
Threat Scorecard
EnigmaSoft Threat Scorecard
EnigmaSoft Threat Scorecards are assessment reports for different malware threats which have been collected and analyzed by our research team. EnigmaSoft Threat Scorecards evaluate and rank threats using several metrics including real-world and potential risk factors, trends, frequency, prevalence, and persistence. EnigmaSoft Threat Scorecards are updated regularly based on our research data and metrics and are useful for a wide range of computer users, from end users seeking solutions to remove malware from their systems to security experts analyzing threats.
EnigmaSoft Threat Scorecards display a variety of useful information, including:
Popularity Rank: The ranking of a particular threat in EnigmaSoft’s Threat Database.
Severity Level: The determined severity level of an object, represented numerically, based on our risk modeling process and research, as explained in our Threat Assessment Criteria.
Infected Computers: The number of confirmed and suspected cases of a particular threat detected on infected computers as reported by SpyHunter.
See also Threat Assessment Criteria.
| Popularity Rank: | 15,053 |
| Threat Level: | 100 % (High) |
| Infected Computers: | 789 |
| First Seen: | July 24, 2009 |
| Last Seen: | March 14, 2026 |
| OS(es) Affected: | Windows |
PCK.MEW is malicious software that has the ability to download other malware onto the infected computer without notification to the computer user. Once this action takes place, malicious files can load into memory at startup of Windows making it difficult to manually detect and remove PCK.MEW.
Table of Contents
Aliases
11 security vendors flagged this file as malicious.
| Antivirus Vendor | Detection |
|---|---|
| Prevx1 | Heuristic: Suspicious File With Code Injection Tec |
| Ikarus | Backdoor.Win32.G_Door.22 |
| Sunbelt | VIPRE.Suspicious |
| Sophos | Mal/EncPk-BA |
| Prevx1 | SystemPoser:Trojan-All Variants |
| Panda | Suspicious file |
| Ikarus | IM-Worm.Win32.Sumom.C |
| F-Secure | Suspicious:W32/Malware!Gemini |
| eSafe | suspicious Trojan/Worm |
| ClamAV | PUA.Packed.MEW-1 |
| CAT-QuickHeal | W32.Brontok.Q |
Analysis Report
General information
| Family Name: | Malware.MEW.Gen |
|---|---|
| Signature status: | No Signature |
Known Samples
Known Samples
This section lists other file samples believed to be associated with this family.|
MD5:
7fcb04ee4ebc147dbccc900edbe6ffc8
SHA1:
53c0c8c74f3e01e93d6d545ab81fe405473440ea
SHA256:
C4FCD493DD2EC807DA296CFECFA0C4AED9D62266841D030671E13407E1B30FF3
File Size:
1.61 MB, 1610779 bytes
|
Windows Portable Executable Attributes
- File doesn't have "Rich" header
- File doesn't have debug information
- File doesn't have exports table
- File doesn't have relocations information
- File doesn't have security information
- File is 32-bit executable
- File is either console or GUI application
- File is GUI application (IMAGE_SUBSYSTEM_WINDOWS_GUI)
- File is Native application (NOT .NET application)
- File is not packed
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- IMAGE_FILE_DLL is not set inside PE header (Executable)
- IMAGE_FILE_EXECUTABLE_IMAGE is set inside PE header (Executable Image)
File Icons
File Icons
This section displays icon resources found within family samples. Malware often replicates icons commonly associated with legitimate software to mislead users into believing the malware is safe.
Windows PE Version Information
Windows PE Version Information
This section displays values and attributes that have been set in the Windows file version information data structure for samples within this family. To mislead users, malware actors often add fake version information mimicking legitimate software.| Name | Value |
|---|---|
| Company Name | Symantec Corporation |
| File Description | Self-Extracting Custom Command Launcher |
| File Version | 1.2.3.924 RELEASE |
| Internal Name | W32SFX |
| Legal Copyright | Copyright 2002-2003 by Symantec Corporation |
| Original Filename | W32SFX.exe |
| Product Name | Symantec Shared Library |
| Product Version | 1.2.3 |
File Traits
- HighEntropy
- No Version Info
- x86
Files Modified
Files Modified
This section lists files that were created, modified, moved and/or deleted by samples in this family. File system activity can provide valuable insight into how malware functions on the operating system.| File | Attributes |
|---|---|
| c:\symnonav\blankmsicleanup.bat | Synchronize,Write Data |
| c:\symnonav\cleaninstfolder.bat | Synchronize,Write Data |
| c:\symnonav\currdir.txt | Generic Write,Read Attributes |
| c:\symnonav\currsettings.txt | Synchronize,Write Data |
| c:\symnonav\enummsi.bat | Synchronize,Write Data |
| c:\symnonav\esugdir.exe | Synchronize,Write Data |
| c:\symnonav\esugdlgcontrol.exe | Synchronize,Write Data |
| c:\symnonav\esugenum.exe | Synchronize,Write Data |
| c:\symnonav\esugmsi.exe | Synchronize,Write Data |
| c:\symnonav\esugmsiconvert.exe | Synchronize,Write Data |
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| c:\symnonav\esugpm.exe | Synchronize,Write Data |
| c:\symnonav\esugreg.exe | Synchronize,Write Data |
| c:\symnonav\esugsleep.exe | Synchronize,Write Data |
| c:\symnonav\esugunen.exe | Synchronize,Write Data |
| c:\symnonav\esuguneng.exe | Synchronize,Write Data |
| c:\symnonav\logs\date_tue_03_10_2026-time_1_59_34_66_nonav.log | Generic Read,Write Data,Write Attributes,Write extended,Append data |
| c:\symnonav\logs\date_tue_03_10_2026-time_1_59_34_66_nonav.log | Generic Write,Read Attributes |
| c:\symnonav\logs\tmp.log | Generic Read,Write Data,Write Attributes,Write extended,Append data |
| c:\symnonav\logs\tmp.log | Generic Write,Read Attributes |
| c:\symnonav\msiunst.bat | Synchronize,Write Data |
| c:\symnonav\nolu.inf | Synchronize,Write Data |
| c:\symnonav\nolu.reg | Synchronize,Write Data |
| c:\symnonav\nonav.bat | Synchronize,Write Data |
| c:\symnonav\nonav.inf | Synchronize,Write Data |
| c:\symnonav\nonav.reg | Synchronize,Write Data |
| c:\symnonav\nonav.txt | Synchronize,Write Data |
| c:\symnonav\noquar.inf | Synchronize,Write Data |
| c:\symnonav\noquar.reg | Synchronize,Write Data |
| c:\symnonav\productcodes.txt | Synchronize,Write Data |
| c:\symnonav\rtvstop.exe | Synchronize,Write Data |
| c:\symnonav\scfuninst.bat | Synchronize,Write Data |
| c:\symnonav\scskeys.reg | Synchronize,Write Data |
| c:\symnonav\serviceshutdown.exe | Synchronize,Write Data |
| c:\symnonav\serviceshutdown_in.txt | Synchronize,Write Data |
| c:\symnonav\sevinst.exe | Synchronize,Write Data |
| c:\symnonav\silentnonav.bat | Synchronize,Write Data |
| c:\symnonav\sqlunst.bat | Synchronize,Write Data |
| c:\symnonav\unengvar.bat | Synchronize,Write Data |
| c:\symnonav\unengvar.txt | Synchronize,Write Data |
| c:\symnonav\unregisterdlls.bat | Synchronize,Write Data |
| c:\users\user\appdata\local\temp\~sfx69afdd75\autorun.iff | Generic Write,Read Attributes |
| c:\users\user\appdata\local\temp\~sfx69afdd75\blankmsicleanup.bat | Generic Write,Read Attributes |
| c:\users\user\appdata\local\temp\~sfx69afdd75\cleaninstfolder.bat | Generic Write,Read Attributes |
| c:\users\user\appdata\local\temp\~sfx69afdd75\currsettings.txt | Generic Write,Read Attributes |
| c:\users\user\appdata\local\temp\~sfx69afdd75\enummsi.bat | Generic Write,Read Attributes |
| c:\users\user\appdata\local\temp\~sfx69afdd75\esugdir.exe | Generic Write,Read Attributes |
| c:\users\user\appdata\local\temp\~sfx69afdd75\esugdlgcontrol.exe | Generic Write,Read Attributes |
| c:\users\user\appdata\local\temp\~sfx69afdd75\esugenum.exe | Generic Write,Read Attributes |
| c:\users\user\appdata\local\temp\~sfx69afdd75\esugmsi.exe | Generic Write,Read Attributes |
| c:\users\user\appdata\local\temp\~sfx69afdd75\esugmsiconvert.exe | Generic Write,Read Attributes |
| c:\users\user\appdata\local\temp\~sfx69afdd75\esugpm.exe | Generic Write,Read Attributes |
| c:\users\user\appdata\local\temp\~sfx69afdd75\esugreg.exe | Generic Write,Read Attributes |
| c:\users\user\appdata\local\temp\~sfx69afdd75\esugsleep.exe | Generic Write,Read Attributes |
| c:\users\user\appdata\local\temp\~sfx69afdd75\esugunen.exe | Generic Write,Read Attributes |
| c:\users\user\appdata\local\temp\~sfx69afdd75\esuguneng.exe | Generic Write,Read Attributes |
| c:\users\user\appdata\local\temp\~sfx69afdd75\msiunst.bat | Generic Write,Read Attributes |
| c:\users\user\appdata\local\temp\~sfx69afdd75\nolu.inf | Generic Write,Read Attributes |
| c:\users\user\appdata\local\temp\~sfx69afdd75\nolu.reg | Generic Write,Read Attributes |
| c:\users\user\appdata\local\temp\~sfx69afdd75\nonav.bat | Generic Write,Read Attributes |
| c:\users\user\appdata\local\temp\~sfx69afdd75\nonav.inf | Generic Write,Read Attributes |
| c:\users\user\appdata\local\temp\~sfx69afdd75\nonav.reg | Generic Write,Read Attributes |
| c:\users\user\appdata\local\temp\~sfx69afdd75\nonav.txt | Generic Write,Read Attributes |
| c:\users\user\appdata\local\temp\~sfx69afdd75\noquar.inf | Generic Write,Read Attributes |
| c:\users\user\appdata\local\temp\~sfx69afdd75\noquar.reg | Generic Write,Read Attributes |
| c:\users\user\appdata\local\temp\~sfx69afdd75\productcodes.txt | Generic Write,Read Attributes |
| c:\users\user\appdata\local\temp\~sfx69afdd75\rtvstop.exe | Generic Write,Read Attributes |
| c:\users\user\appdata\local\temp\~sfx69afdd75\scfuninst.bat | Generic Write,Read Attributes |
| c:\users\user\appdata\local\temp\~sfx69afdd75\scskeys.reg | Generic Write,Read Attributes |
| c:\users\user\appdata\local\temp\~sfx69afdd75\serviceshutdown.exe | Generic Write,Read Attributes |
| c:\users\user\appdata\local\temp\~sfx69afdd75\serviceshutdown_in.txt | Generic Write,Read Attributes |
| c:\users\user\appdata\local\temp\~sfx69afdd75\sevinst.exe | Generic Write,Read Attributes |
| c:\users\user\appdata\local\temp\~sfx69afdd75\silentnonav.bat | Generic Write,Read Attributes |
| c:\users\user\appdata\local\temp\~sfx69afdd75\sqlunst.bat | Generic Write,Read Attributes |
| c:\users\user\appdata\local\temp\~sfx69afdd75\unengvar.bat | Generic Write,Read Attributes |
| c:\users\user\appdata\local\temp\~sfx69afdd75\unengvar.txt | Generic Write,Read Attributes |
| c:\users\user\appdata\local\temp\~sfx69afdd75\unregisterdlls.bat | Generic Write,Read Attributes |
Registry Modifications
Registry Modifications
This section lists registry keys and values that were created, modified and/or deleted by samples in this family. Windows Registry activity can provide valuable insight into malware functionality. Additionally, malware often creates registry values to allow itself to automatically start and indefinitely persist after an initial infection has compromised the system.| Key::Value | Data | API Name |
|---|---|---|
| HKLM\system\controlset001\services\bam\state\usersettings\s-1-5-21-3119368278-1123331430-659265220-1001::\device\harddiskvolume2\windows\system32\conhost.exe | 㜆끬ǜ | RegNtPreCreateKey |
Windows API Usage
Windows API Usage
This section lists Windows API calls that are used by the samples in this family. Windows API usage analysis is a valuable tool that can help identify malicious activity, such as keylogging, security privilege escalation, data encryption, data exfiltration, interference with antivirus software, and network request manipulation.| Category | API |
|---|---|
| Process Manipulation Evasion |
|
| Process Shell Execute |
|
| Syscall Use |
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|
| Anti Debug |
|
| User Data Access |
|
Shell Command Execution
Shell Command Execution
This section lists Windows shell commands that are run by the samples in this family. Windows Shell commands are often leveraged by malware for nefarious purposes and can be used to elevate security privileges, download and launch other malware, exploit vulnerabilities, collect and exfiltrate data, and hide malicious activity.
NoNav.bat
|
C:\SymNoNav\esugunen.exe ESUGUnEn /LF".\logs\tmp.log" /DELVAL"HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Runonce" "ESUGUnEng1"
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C:\SymNoNav\esugunen.exe ESUGUnEn /LF".\logs\tmp.log" /DELVAL"HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Runonce" "ESUGUnEng2"
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C:\SymNoNav\esugunen.exe ESUGUnEn /LF".\logs\tmp.log" /DELVAL"HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Runonce" "ESUGUnEng3"
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C:\SymNoNav\esugunen.exe ESUGUnEn /LF".\logs\tmp.log" /DELVAL"HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Runonce" "ESUGUnEng4"
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C:\SymNoNav\esugunen.exe ESUGUnEn /LF".\logs\tmp.log" /DELVAL"HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Runonce" "ESUGUnEng5"
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C:\SymNoNav\esugdlgcontrol.exe ESUGdlgcontrol -title "NoNav" -msg "NoNav will remove NAVCE and Symantec AV version 4
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