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BlackCat/ALPHV affiliates carried out targeted double-extortion attacks by stealing data and deploying ransomware across Windows, Linux, and VMware ESXi environments, using a Rust-based payload that supports extensive customization. Reporting from Microsoft, Netskope, and Forescout shows the group gaining initial access through several routes, including compromised RDP credentials, exploitation of an unpatched Exchange server, an Internet-exposed SonicWall firewall, and a contractor account compromised via a malicious browser extension that led to virtual desktop access without MFA. After entry, operators escalated privileges, enumerated domains and devices, dumped credentials, and moved laterally with legitimate tools such as PsExec before staging broad encryption operations.
In one analyzed intrusion, attackers used a compromised domain account to push the ExMatter exfiltration tool and the BlackCat payload to more than 2,000 machines, with ExMatter collecting selected file types and sending them over WebDAV to attacker-controlled infrastructure. Researchers also documented BlackCat features including self-propagation via NetBIOS discovery, shadow copy deletion, service termination, event log clearing attempts, and ESXi-specific actions such as stopping virtual machines and deleting snapshots. Separate technical analysis and tooling published by defenders showed that BlackCat binaries embed configurable options for ransom notes, propagation, encryption behavior, and virtualization-focused disruption, underscoring how affiliates adapt the malware to different victim environments.
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10 events from the most recent confirmed update back to the earliest known activity.
In September 2022, BlackCat claimed to have breached a contractor serving the U.S. Department of Defense and other government agencies.
Netskope reports the BlackCat ransomware payload used in its analyzed incident was compiled in July 2022, indicating use of a newer variant requiring an access token to decrypt configuration.
Forescout states the ransomware deployment in the analyzed VMware ESXi intrusion occurred on March 17, 2022.
Microsoft and other referenced reporting state that BlackCat/ALPHV was first observed or discovered in November 2021 as a ransomware-as-a-service operation.
After escalating privileges and moving laterally, the attackers used PsExec and a compromised domain account to deploy ExMatter and the BlackCat ransomware payload to more than 2,000 machines.
In the targeted BlackCat incident analyzed by Netskope, attackers compromised a contractor account using a malicious browser extension and used the lack of MFA to access a virtual desktop inside the corporate network.
In the Netskope-analyzed intrusion, the attackers set up the ExMatter server used for WebDAV-based data exfiltration one day before the attack.
Microsoft published analysis describing BlackCat as a prevalent RaaS threat, identifying affiliates DEV-0237 and DEV-0504 and detailing observed intrusion chains using Exchange exploitation or compromised RDP credentials.
A GitHub project published a static configuration extractor for BlackCat/ALPHV samples across Windows, Linux, and ESXi, enabling extraction of embedded config data.
In an analyzed incident, an ALPHV affiliate gained initial access through an internet-exposed SonicWall firewall and later moved to encrypt a VMware ESXi virtual farm.
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BlackCat/ALPHV operators were linked to intrusions that began with exploitation of vulnerable **Microsoft Exchange** servers, including **`CVE-2021-31207`** in ProxyShell-style activity and other unpatched Exchange exposures. Investigators observed the attackers planting **ASPX web shells**, using IIS worker processes to launch PowerShell, and establishing persistence and remote access with tools including **MobaXterm**. In one case, a tampered **`libeay32.dll`** was downloaded to sideload **Cobalt Strike**, while post-compromise activity included credential theft through **Mimikatz** or **LSASS** dumping with Process Hacker, along with account and network discovery using **SoftPerfect Network Scanner**, **NetScan**, **BloodHound**, **Inveigh**, and **CrackMapExec**. Before encryption, the operators compressed targeted data with **WinRAR** or **7-Zip** and exfiltrated files through **rclone**, **MEGAsync**, and in some cases **FileZilla** or **WinSCP**. Lateral movement and staging were carried out over SMB, including use of **SysVol** shares and local paths such as **`C:\Windows\debug`**, followed by permission changes, shadow copy deletion, recovery disabling, and log clearing. Researchers also identified a newer BlackCat variant with previously undocumented command-line options including **`--safeboot`** and **`--sleep-restart`**, underscoring the group’s continued ability to target **Windows, Linux, and VMware ESXi** environments while pairing encryption with data theft and Tor-based extortion.
Aug 15, 2026
Cisco Talos reported that **BlackCat** (also tracked as **ALPHV**) shares infrastructure, tools, filenames, and intrusion tradecraft with the **BlackMatter/DarkSide** ransomware ecosystem, indicating with moderate confidence that at least one BlackMatter affiliate became an early BlackCat operator rather than the group being a simple rebrand. In side-by-side intrusions, Talos observed similar human-operated attack phases including persistent access through tunneling tools, credential theft via **LSASS** dumping, lateral movement with **Impacket `wmiexec`**, **WinRM/PowerShell**, and **RDP**, and domain-wide ransomware deployment from the domain controller’s **NETLOGON** share after scripts such as `apply.ps1`, `defender.vbs`, and `def.vbs` were staged. Talos said BlackCat dwell time exceeded 15 days in one case and noted that more than 30 percent of observed compromises affected U.S.-based organizations. Other reporting and technical analyses describe BlackCat as a **Rust-based ransomware-as-a-service** platform that emerged in late 2021, recruited affiliates from groups including **REvil, BlackMatter, and DarkSide**, and offered operators roughly **80 to 90 percent** of ransom proceeds. Researchers said the malware targets **Windows, Linux, and VMware ESXi** environments, uses double extortion with Tor-based payment portals, and includes capabilities such as **CMSTPLUA** privilege escalation, shadow-copy deletion, service and process termination, and configurable encryption using embedded keys. The overlap with DarkSide-era techniques is reinforced by prior DarkSide analyses showing similar affiliate-driven operations, extortion infrastructure, and malware behaviors, supporting the view that BlackCat grew out of the same criminal talent pool rather than appearing as an entirely separate threat.
Aug 15, 2026
Kaspersky detailed a BlackCat (`ALPHV`) ransomware intrusion in which attackers gained access with stolen credentials and moved laterally through the victim environment using common post-exploitation tooling, including **Impacket**. The operation followed a familiar double-extortion pattern: the intruders escalated privileges, conducted internal reconnaissance, staged data for exfiltration, and prepared systems for encryption before deploying the BlackCat payload. The incident showed how BlackCat affiliates combined legitimate remote administration activity with widely available offensive tools to blend into normal network traffic and accelerate compromise. The report highlights the group’s continued reliance on credential abuse, lateral movement over Windows administrative protocols, and data theft ahead of ransomware execution, underscoring the risk posed by affiliates that can rapidly turn an initial foothold into enterprise-wide disruption.
Jul 12, 2026