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Ransomware Research
BigLock Ransomware
BigLock is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on May 1, 2020, this ransomware has been actively targeting systems worldwide. Security researchers also track this malware under the aliases: CoronaLock, Corona-lock, CoronaLocker.
Quick Facts
- Ransomware Family
- BigLock
- First Seen
- May 1, 2020
- Known Aliases
- CoronaLockCorona-lockCoronaLocker
How BigLock Ransomware Works
Targeted Files
Encrypts first 0x75300 bytes Requires C&C -> fbb2a672cd40b979add8f52e4cba8f58273160b687913ab83f650ae3681efa25 -> http://195.189.96.66/repeater.php
File Encryption Patterns
BigLock modifies encrypted files using specific patterns to mark them as encrypted:
File extensions added after encryption:
..biglock
..corona-lock
..pandemic
..systems32x
..nermer
..t1000
..t800
Ransom Note and Payment Demands
After encrypting files, BigLock displays ransom notes demanding payment for file recovery:
README_LOCK.TXT
Ransom message:
notes/README_LOCK.TXT
Note locations:
Desktop
PROTECT.txt
@_FILES_WERE_ENCRYPTED_@.TXT
Ransom message:
notes/@_FILES_WERE_ENCRYPTED_@.TXT
Note locations:
EveryFolder
@_HOW_TO_DECRYPT_FILES_@.TXT
Ransom message:
notes/@_HOW_TO_DECRYPT_FILES_@.TXT
Note locations:
EveryFolder
@_HOW_TO_PAY_THE_RANSOM_@.TXT
Ransom message:
notes/@_HOW_TO_PAY_THE_RANSOM_@.TXT
Note locations:
EveryFolder
PROTECT_INFO.TXT
Ransom message:
notes/PROTECT_INFO.TXT
Note locations:
Desktop
CRYPTiNFO.TXT
Ransom message:
notes/CRYPTiNFO.TXT
Note locations:
Desktop
!!!HOW_TO_DECRYPT!!!.txt
Technical Indicators
Associated Executable Files
The following executable files are associated with BigLock ransomware:
2020-05-22_17-36-19.exe
covidworldcry.exe
DUMo
setup_theme_895670451.bin
lkx333.exe
convimage.exe
locker.exe
drvintel.exe
SysLogsService.exe
cmd.exe
Elastio Can Help You
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About This Analysis
This BigLock ransomware analysis is part of Elastio's comprehensive ransomware detection database. Elastio provides advanced ransomware protection and recovery solutions, helping organizations defend against and recover from ransomware attacks like BigLock.
Last updated: July 30, 2025