MalwarePublished 10 May 2024Updated 19 Jul 2024

tlp white · CISA - AA24-131A #StopRansomware: Black Basta

Affects tlp whiteSource CIRCL OSINT Feed

TLP:WHITE, disclosure is not limited

Description

CISA - AA24-131A #StopRansomware: Black Basta

Impact

For European organizations, Black Basta ransomware poses a significant risk to operational continuity, data confidentiality, and integrity. The use of phishing and valid credentials as entry points means that organizations with large user bases or insufficient credential hygiene are particularly vulnerable. Once inside, the disabling of defense tools can lead to prolonged undetected presence, increasing the potential damage. The encryption of critical data and inhibition of recovery processes can halt business operations, leading to financial losses, reputational damage, and regulatory consequences, especially under GDPR requirements for data protection and breach notification. Sectors such as healthcare, finance, manufacturing, and critical infrastructure in Europe could face severe disruptions. The low severity rating may reflect current observed activity levels or limited scope, but the potential for escalation remains, especially if attackers refine their techniques or target high-value entities.

Defensive guidance

European organizations should implement targeted measures beyond generic advice: 1) Enhance phishing resilience through continuous, context-specific user training and simulated phishing exercises tailored to local languages and cultural contexts. 2) Enforce strict credential management policies, including multi-factor authentication (MFA) on all remote and privileged accounts to mitigate risks from valid account misuse. 3) Deploy advanced endpoint detection and response (EDR) solutions capable of detecting defense evasion behaviors such as tool tampering. 4) Regularly audit and harden security tools to prevent unauthorized modifications, including restricting administrative privileges and employing application whitelisting. 5) Maintain immutable, offline backups with tested recovery procedures to counteract data encryption and recovery inhibition tactics. 6) Implement network segmentation to limit lateral movement if initial access is gained. 7) Monitor for indicators of compromise related to Black Basta TTPs, even though none are currently listed, by leveraging threat intelligence sharing platforms. 8) Establish incident response plans that specifically address ransomware scenarios, including communication strategies compliant with European data protection laws.

Summary

The Black Basta ransomware is a malware threat characterized by its use of multiple attack techniques to gain initial access, evade defenses, and cause significant impact through data encryption and system recovery inhibition. Initial access methods include phishing campaigns (T1566) and the use of valid accounts (T1078), which allow attackers to infiltrate networks by tricking users or leveraging compromised credentials. Once inside, the malware employs defense evasion tactics such as disabling or modifying security tools (T1562.001) to avoid detection and prolong its presence. The ransomware then encrypts data to disrupt business operations (T1486) and inhibits system recovery mechanisms (T1490), preventing victims from restoring their systems without paying a ransom. Although no specific affected software versions or patches are noted, the threat is persistent and ongoing, as indicated by its perpetual lifetime tag. The severity is currently rated as low by the source, but the combination of attack patterns suggests a potentially impactful ransomware campaign. No known exploits in the wild or CVSS score are provided, but the tactics align with sophisticated ransomware operations that can cause substantial operational and financial damage.

Indicators of compromise

Domains 105

literoved.ru
winklen.ch
xkpal.1a4a64b6.dns.blocktoday.net
nuher.1d67bbcf4.456d87aa6.2d84dfba.dns.specialdrills.com
blocktoday.net
xkpal.d6597fa.dns.blocktoday.net
my.2a91c002002.588027fa.dns.realbumblebee.net
dns.artspathgroupe.net
dns.trailshop.net
0gpw.588027fa.dns.realbumblebee.net

URLs 3

fy9.36c44903529fa273afff3c9b7ef323432e223d22ae1d625c4a3957d57.015c16eff32356bf566c4fd3590c6ff9b2f6e8c587444ecbfc4bcae7.f71995aff9e6f22f8daffe9d2ad9050abc928b8f93bb0d42682fd3c3.445de2118.588027fa.dns.realbumblebee.net
nuher.3577125d2a75f6a277fc5714ff536c5c6af5283d928a66daad6825b9a.7aaf8bba88534e88ec89251c57b01b322c7f52c7f1a5338930ae2a50.cbb47411f60fe58f76cf79d300c03bdecfb9e83379f59d80b8494951.e10c20f77.7fcc0eb6.dns.blocktoday.net
fy9.39d9030e5d3a8e2352daae2f4cd3c417b36f64c6644a783b9629147a1.afd8b8a4615358e0313bad8c544a1af0d8efcec0e8056c2c8eee96c7.b06d1825c0247387e38851b06be0272b0bd619b7c9636bc17b09aa70.a46890f27.588027fa.dns.realbumblebee.net

IP addresses 20

83.243.40.10
88.198.198.90
183.181.86.147
80.239.207.200
155.138.246.122
46.8.10.134
188.130.137.181
188.130.218.39
5.183.130.92
107.189.30.69

Hashes 86

b3fe23dd4701ed00d79c03043b0b952e
2642ec377c0cee3235571832cb472870
4c897334e6391e7a2fa3cbcbf773d5a4
b32daf27aa392d26bdf5faafbaae6b21cd6c918d461ff59f548a73d447a96dd9
3337a7a9ccdd06acdd6e3cf4af40d871172d0a0e96fc48787b574ac93689622a
69192821f8ce4561cf9c9cb494a133584179116cb2e7409bea3e18901a1ca944
0a8297b274aeab986d6336b395b39b3af1bb00464cf5735d1ecdb506fef9098e
42f05f5d4a2617b7ae0bc601dd6c053bf974f9a337a8fcc51f9338b108811b78
17879ed48c2a2e324d4f5175112f51b75f4a8ab100b8833c82e6ddb7cd817f20
3090a37e591554d7406107df87b3dc21bda059df0bc66244e8abef6a5678af35

Comment 1

Imported from STIX header description

The Federal Bureau of Investigation (FBI), Cybersecurity and Infrastructure Security Agency (CISA), Department of Health and Human Services (HHS), and Multi-State Information Sharing and Analysis Center (MS-ISAC) (hereafter referred to as the authoring organizations) are releasing this joint CSA to provide information on Black Basta, a ransomware variant whose actors have encrypted and stolen data from 12 out of 16 critical infrastructure sectors, including the Healthcare and Public Health (HPH) Sector. This joint CSA provides TTPs and IOCs obtained from FBI investigations and third-party reporting. Black Basta is considered a ransomware-as-a-service (RaaS) variant and was first identified in April 2022. Some Black Basta affiliates have impacted a wide range of businesses and critical infrastructure in North America, Europe, and Australia. As of May 2024, Black Basta affiliates have impacted over 500 organizations globally.

Ssdeep 14

196608:puRTOvaeQyt37NKNGZH5c4Eo8qqBNoNdRn+ILwIjKek529:p4TheZaGZZc4Eoko0IcIRkA9
24576:1p2gwjk6ikYhJ9lvGnYZvy48/V33ck7LnBAyldFu8hod/Qodly:1AgxkmvGnYWccjBAwFadRd
24576:wjlZDq1Een/s9NUuKF+gEn7gKheviz6GYtVb9BXpV7wldFu8hod/Qodly:wjlreiUuKFS70A059/V7GFadRd
12288:RcOlvT7Zom3rITxaVDrd5vUa69Ghj91nlQocyW7/P6E4kKjqnes9PBVW/g:RDJJDbcJ90jtH0bP6ELVne2
24576:llm7yYs6kQ2WxeisU09E3b6E/IwU5jjpBAPy:B6YWxG9E3b6Nz5jjpBGy
24576:zvA0H/qL9fu4c8JZHSE6biXLemW34Mi+4LKH:UHL9fu4hSLbiXLer4MD4WH
12288:bO+sm75a7DI9Mv53VI/XfaUs442JbV24chSS1i2wZbDFMMWzVFq:rh75a7M9S3VYa4npY4cFM2MWhY
24576:pyAo7FAIP03acBtXWKe25ep59MxQU08wHG3MJAQof1hB:Lo7ARBtmKe28MSU08wHaM6Qo1hB
12288:lMJYSP5VV3VG7rYyPT+p/VYXMJ8oD536bGIqs7GBvw0QygfmHp:lMVj3IXYETQV1XD5VIZ7GOg1J
12288:trkm8R9qXgmj3d7khtgfpedbKbiTuDZWhswtik5j2w+f:2Ujt7+twpedbKb1dWhse9K

File 13

723d1cf3d74fb3ce95a77ed9dff257a78c8af8e67a82963230dd073781074224
minipath.exe
UpdateReminder.exe
51eb749d6cbd08baf9d43c2f83abd9d4d86eb5206f62ba43b768251a98ce9d3e
350ba7fca67721c74385faff083914ecdd66ef107a765dfb7ac08b38d5c9c0bd
07117c02a09410f47a326b52c7f17407e63ba5e6ff97277446efc75b862d2799
e28188e516db1bda9015c30de59a2e91996b67c2e2b44989a6b0f562577fd757
9a55f55886285eef7ffabdd55c0232d1458175b1d868c03d3e304ce7d98980bc
c:windowssystem32mrpy2bfa7.dll; 96339a7e87ffce6ced247feb9b4cb7c05b83ca315976a9522155bad726b8e5be
ae7c868713e1d02b4db60128c651eb1e3f6a33c02544cc4cb57c3aa6c6581b6e; ae7c868713e1d02b4db60128c651eb1e3f6a33c02544cc4cb57c3aa6c6581b6e.bin

Size in bytes 4

1499648
209170
556576
576512

Text 1

STIX 1.1

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