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The FBI and U.S. Secret Service warned about BlackByte ransomware in a joint advisory dated February 11, 2022. The advisory said BlackByte had compromised organizations in at least three U.S. critical-infrastructure sectors as of November 2021: government facilities, financial services, and food and agriculture. Those figures describe what authorities had observed by that date—not BlackByte’s current activity or victim count.
What is BlackByte ransomware?
In the 2022 advisory, the FBI and U.S. Secret Service described BlackByte as ransomware-as-a-service: attackers use the ransomware to encrypt files on compromised Windows systems, including physical and virtual servers. The agencies reported that some victims recovered some data even when full decryption was not possible. This describes observations in the advisory, not a guarantee about recovery in any incident or about later versions of BlackByte. Read the joint FBI and U.S. Secret Service advisory.
What did the FBI warn about BlackByte?
The joint advisory’s summary reported that BlackByte had compromised multiple U.S. and foreign businesses as of November 2021, including entities in the three named U.S. critical-infrastructure sectors. It did not provide a current victim total, and the November 2021 cutoff should not be read as a count of victims today.
The agencies described reported intrusions in which attackers gained access, moved laterally through networks, escalated privileges, and then exfiltrated and encrypted files. Some victims reported that attackers exploited a known Microsoft Exchange Server vulnerability to get in. These are reported access routes and behaviors; the advisory does not say every BlackByte incident followed the same sequence.
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BlackByte’s behavior varied by version
The advisory noted a detection difference: earlier versions downloaded a PNG file from two listed IP addresses before encryption, while a newer version encrypted files without communicating with an external IP address. As a result, a lack of observed outbound communication alone does not establish that a system is clean.
The advisory also lists indicators including suspicious ASPX files in Exchange- and IIS-related paths, files named BB.ico and BlackByteRestore.txt under AppData, complex.exe, scheduled-task artifacts, suspicious IIS requests, and file hashes. Security teams should use the advisory itself for the complete paths, hashes, commands, and investigative context. These indicators date to 2022 and should not be treated as a complete or current detection set.
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How can organizations protect against BlackByte ransomware?
The advisory’s recommendations span prevention, detection, and recovery. No single listed control is presented as sufficient on its own.
Prevent or limit access
- Apply operating-system, software, and firmware patches promptly, including relevant server updates.
- Review domain controllers, servers, workstations, and Active Directory for new or unrecognized accounts. Audit administrator accounts and apply least privilege.
- Disable unused remote-access and RDP ports. Monitor remote-access and RDP logs for unusual activity.
Improve detection
- Use identified indicators in SIEM monitoring to support continuous monitoring and alerts. Because indicators can become stale, validate them against current threat intelligence and the advisory’s full technical details.
- Maintain updated anti-malware protection and keep software current, as the FBI’s general ransomware guidance recommends.
Prepare to recover
- Maintain regular, air-gapped, password-protected offline backups that cannot be modified or deleted from systems holding the original data.
- Check that backups complete successfully, keep them disconnected from the systems and networks they protect, and maintain a continuity plan.
Removable storage can be one component of an offline backup arrangement, but a drive by itself is not a ransomware defense. Organizations need to choose backup architecture and access controls that fit their systems and recovery requirements. The FBI’s ransomware guidance also recommends current software, updated anti-malware protection, verified backups, and continuity planning.
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What should victims do, and should they pay?
The FBI says victims can contact a local FBI field office or report an incident to IC3. The BlackByte advisory also provides FBI and U.S. Secret Service field-office routes and identifies CISA as a source of technical assistance; consult the advisory for the relevant details.
On paying, the FBI states: “The FBI does not support paying a ransom in response to a ransomware attack.” It explains that payment does not guarantee the return of data and may encourage further targeting. Organizations facing an incident should use official reporting channels and seek appropriate technical and legal support.
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