UnknownPublished 19 Oct 2025

HardBit 4.0 Investigation by Reyben Cortes

Source CIRCL OSINT Feed

TLP:WHITE, disclosure is not limited

Description

Impact

For European organizations, the HardBit 4.0 threat poses a risk primarily to data confidentiality and availability. Successful attacks could result in encrypted data that disrupts business operations, leading to downtime and financial losses. The exfiltration component threatens sensitive data exposure, potentially causing regulatory compliance issues under GDPR and damaging organizational reputation. Critical infrastructure sectors such as energy, finance, healthcare, and government are particularly vulnerable due to their reliance on continuous data availability and the high value of their data. The use of application layer protocols for C2 and exfiltration may allow the malware to bypass traditional network defenses, increasing the difficulty of detection. The absence of patches means organizations must rely on proactive security monitoring and incident response capabilities. Overall, the threat could lead to operational disruption, data breaches, and regulatory penalties if not effectively mitigated.

Defensive guidance

European organizations should implement advanced network traffic analysis tools capable of detecting unusual encrypted or compressed data flows, especially over application layer protocols. Deploying network segmentation to isolate critical systems can limit malware propagation and data exfiltration paths. Regularly updated endpoint detection and response (EDR) solutions should be used to identify suspicious encryption activities and process behaviors. Maintaining comprehensive, offline, and immutable backups is essential to recover from data encryption without paying ransom. Organizations should also enforce strict access controls and multi-factor authentication to reduce the attack surface. Threat hunting exercises focusing on T1486, T1002, T1022, T1071, and T1041 techniques can help identify early signs of compromise. Finally, staff awareness training on ransomware and data exfiltration tactics can reduce the risk of initial infection vectors.

Indicators of compromise

Hashes 12

36c85c0ba7046433c48af6d2492dfdcd0f5c7ee26b137249acc7de4ab48ea6e2Ransomware payload
29b3c4c96dd932f3e6b828a8a147ec25664913391c30406e2cca638fb1962567ransomware payload
aec47e12f0cb9fbb3d99faa5bdb58f9ece03a1da2a497431221e293b5c55b211
b32317fcf295b75d6e089ca42a323f5d
dc8c26c71e885b085af967f819d7f9ac0f9809b7
aec47e12f0cb9fbb3d99faa5bdb58f9ece03a1da2a497431221e293b5c55b211
a57ed12aaf054f69c1442410fecdfaf6
88027d16b91e313aaf74271543dffa0975ff7249
29b3c4c96dd932f3e6b828a8a147ec25664913391c30406e2cca638fb1962567
a24dea9616c4047b172e61309becccc8

Comment 5

aec47e12f0cb9fbb3d99faa5bdb58f9ece03a1da2a497431221e293b5c55b211
36c85c0ba7046433c48af6d2492dfdcd0f5c7ee26b137249acc7de4ab48ea6e2ransomware payload
29b3c4c96dd932f3e6b828a8a147ec25664913391c30406e2cca638fb1962567ransomware payload
hardbit_locker@tutamail.comextortion email
6387u460.exepayload name

Email addresses 1

Ransom email

hardbit_locker@tutamail.com

Tlsh 3

t167f41224f3ca8831c4941e79ac19d7d0ab35d7680cad2b33b0ec485deb835859e673b9
t128651251bb49cd92c1ba16b68d42c3f16724ce5c4962eb3730fddc6fbb872840e4265a
t114e41234b3ce8521c5d81a766d19d7d0bf34c79848ae2b23b0dc8499ab835859f673b8

Vhash 3

0750866d1c0d1c0515651035zc00159z25z23z2fz
21605f766555161b7081f8b6fb683
27505f766555161aa09153b121054

Ssdeep 3

12288:ViRlPuZskio2eiMJ9keNWZ0tiLI4CTEYMhQZsp+betsdsUId1wyPk:QHPuWkiQiMJOe9tiUE3aupMetsPUk
24576:AIf8oTbo5AMj60vap9OsBtD81BRfSBck+QA16twaKYGTtf2kHB4jOr2mzgaWtzX:p3bkAA3sUsYPqjZwawf2khXCmzst7
12288:GPviRlPuZskio2eiMJ9keNWZ0tiLI4CTEYMhQZsp+betsdsUId1wE:AKHPuWkiQiMJOe9tiUE3aupMetsPE

Link 1

https://www.virustotal.com/gui/ip_address/a83f:8110:71b3:da01:855f:25cf:71b3:da01

Text 1

0/95

Community reviews

Loading reviews…