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Paper Abstract and Keywords
Presentation 2025-07-09 11:30
Analyzing Ransomware Encryption Processes for Detection and File Recovery
Shota Higashiseto (Kobe Univ.), Masato Ikegami, Yusuke Sumida, Haruka Ichiyanagi, Hajime Ichihara, Motoyuki Okaniwa, Tomohisa Hasegawa (Canon IT Solutions), Yoshiaki Shiraishi, Masakatu Morii (Kobe Univ.) ISEC2025-58 SITE2025-48 BioX2025-72 HWS2025-47 ICSS2025-58 EMM2025-61
Abstract (in Japanese) (See Japanese page) 
(in English) Ransomware attacks primarily inflict damage through file encryption and data exfiltration. While early detection methods for ransomware are advancing, identifying threats before the initiation of encryption remains a significant challenge. Consequently, even with prompt detection, some files may already be encrypted and unrecoverable. This study analyzes the encryption processes of ransomware, focusing on the BabyLockerKZ variant—a derivative of MedusaLocker active since 2024. Building upon our previous work in 2020 on MedusaLocker, we propose a method to detect ransomware activity promptly and recover encrypted files by exploiting vulnerabilities in the encryption process. Our findings demonstrate the potential for effective file restoration after the onset of encryption, thereby minimizing system downtime and data loss.
Keyword (in Japanese) (See Japanese page) 
(in English) cybersecurity / ransomware / malware / detection / encryption / / /  
Reference Info. IEICE Tech. Rep., vol. 125, no. 103, ICSS2025-58, pp. 274-279, July 2025.
Paper # ICSS2025-58 
Date of Issue 2025-06-30 (ISEC, SITE, BioX, HWS, ICSS, EMM) 
ISSN Online edition: ISSN 2432-6380
Copyright
and
reproduction		 All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034)
Download PDF ISEC2025-58 SITE2025-48 BioX2025-72 HWS2025-47 ICSS2025-58 EMM2025-61

Conference Information
Committee HWS BioX ISEC SITE ICSS EMM IPSJ-CSEC IPSJ-SPT 
Conference Date 2025-07-07 - 2025-07-09 
Place (in Japanese) (See Japanese page) 
Place (in English) Sapporo Convention Center 
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To ICSS 
Conference Code 2025-07-HWS-BioX-ISEC-SITE-ICSS-EMM-CSEC-SPT 
Language English (Japanese title is available) 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Analyzing Ransomware Encryption Processes for Detection and File Recovery 
Sub Title (in English)  
Keyword(1) cybersecurity  
Keyword(2) ransomware  
Keyword(3) malware  
Keyword(4) detection  
Keyword(5) encryption  
Keyword(6)  
Keyword(7)  
Keyword(8)  
1st Author's Name Shota Higashiseto  
1st Author's Affiliation Graduate School of Engineering, Kobe University (Kobe Univ.)
2nd Author's Name Masato Ikegami  
2nd Author's Affiliation Cyber Security Laboratory, Canon IT Solutions Inc. (Canon IT Solutions)
3rd Author's Name Yusuke Sumida  
3rd Author's Affiliation Cyber Security Laboratory, Canon IT Solutions Inc. (Canon IT Solutions)
4th Author's Name Haruka Ichiyanagi  
4th Author's Affiliation Cyber Security Laboratory, Canon IT Solutions Inc. (Canon IT Solutions)
5th Author's Name Hajime Ichihara  
5th Author's Affiliation Cyber Security Laboratory, Canon IT Solutions Inc. (Canon IT Solutions)
6th Author's Name Motoyuki Okaniwa  
6th Author's Affiliation Cyber Security Laboratory, Canon IT Solutions Inc. (Canon IT Solutions)
7th Author's Name Tomohisa Hasegawa  
7th Author's Affiliation Cyber Security Laboratory, Canon IT Solutions Inc. (Canon IT Solutions)
8th Author's Name Yoshiaki Shiraishi  
8th Author's Affiliation Graduate School of Engineering, Kobe University (Kobe Univ.)
9th Author's Name Masakatu Morii  
9th Author's Affiliation Graduate School of Engineering, Kobe University (Kobe Univ.)
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Speaker Author-1 
Date Time 2025-07-09 11:30:00 
Presentation Time 25 minutes 
Registration for ICSS 
Paper # ISEC2025-58, SITE2025-48, BioX2025-72, HWS2025-47, ICSS2025-58, EMM2025-61 
Volume (vol) vol.125 
Number (no) no.99(ISEC), no.100(SITE), no.101(BioX), no.102(HWS), no.103(ICSS), no.104(EMM) 
Page pp.274-279 
#Pages 6 
Date of Issue 2025-06-30 (ISEC, SITE, BioX, HWS, ICSS, EMM) 

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