한국어 | English
Zero-trust based Service to Detect / Analyze or CDR (Content Disarm & Reconstruction) for advanced malicious code attacks using non-executable document files
* SecuLetter MARS DEFENDER is a free malware analysis service. Submitted files can be used to improve the service, so please do not submit sensitive information.
For detailed usage information, please see the information below.
Submit Time File Name Diagnosis Result Sanitize Result
Figure out if suspicious files are malicious
  • Analysis technique based on Software Reverse-engineering
  • Detect malicious document files (Exploit, Macro) for hacking attack
Eliminate potential threat in suspicious files
  • Based on ZeroTrust CDR (Content Disarm & Reconstruction)
  • Eliminate potential threats in documents (e.g. Hypertext, DDE, Macro, JavaScript etc.) without changing layout and reconstruct the files
Policy for uploading files
  • Only file size under 30MB is available, Compressed file : Can be analyzed up to 1-depth & 20 files inside in one compressed file
  • Support document type
    • doc/docx/docm/rtf, xls/xlsx, ppt/pptx/pptm, hwp/hwpx, pdf, html, SWF, JS, VBS, VBE, JSE, exe/dll/sys/scr, image files
※ If you need more information for the service, please email us at contact@seculetter.com
# Terms of Service
  • Submission of files to use SecuLetter MARS DEFENDER Service, means you agree to SecuLetter’s Terms of Service & Privacy Policy.
  • All files submitted can be used for SecuLetter service improvement purpose and can be shared to the third party (Research firm, Community, etc.).
  • Please do not submit restrict documents or any documents containing sensitive data such as copyright, personal information, etc.
  • SecuLetter do not take a responsibility for all files being submitted for the service usage.
  • For more information, please refer to the Seculetter service terms and conditions (www.seculetter.com/service.php).
Analysis request successful ( txId : '' )
Check the analysis status on the current page when inquiring the analysis status, and show the analysis results when completed.
Inquiring analysis status . . .
Status :
When the analysis is completed, the button that allows you to check the analysis result immediately is enabled.
Change Password
Please change your password for privacy protection purpose.
Current Password
New Password
Confirm New Password
The password must be at least 9 characters long and should consist of a mix of uppercase and lowercase letters, numbers, and special characters. Passwords must not contain sequential keyboard arrays. (ex. 'qwerty', 'asdf') Passwords must not repeat the same number more than three times in a row. (ex. '111', '222') Passwords must not repeat the same character more than three times in a row. (ex. 'aaa', 'bbb') Passwords should not contain easily predictable words. (ex. 'happy', 'love') Passwords cannot contain more than 3 sequential digits. (ex. '123', '3456') You cannot use a password that you used within a year.
Updated Terms
Thank you for using SecuLetter Email Security.
We have revised our End User License Agreement,  Terms of Service and Privacy Policy.
By continuing to use our service, it is required to accept the updated terms. Please take a few minutes to read and understand the terms.