The Akira ransomware group poses an “imminent threat to critical infrastructure,” the U.S. Cybersecurity and Infrastructure Security Agency (CISA) warned today.
CISA joined with the FBI, other U.S. agencies and international counterparts to issue a lengthy updated advisory on the ransomware group, adding many new Akira tactics, techniques and procedures (TTPs), indicators of compromise (IoCs), and vulnerabilities exploited by the group.
Akira is consistently one of the most active ransomware groups, so the update from CISA and other agencies is significant. As of late September, Akira has netted about $244.17 million in ransom payments, CISA said.
The Akira ransomware group information was sourced from “FBI investigations and trusted third-party reporting,” the agency said.
In a busy two days for the agency, CISA also added three vulnerabilities to its Known Exploited Vulnerabilities (KEV) catalog (CVE-2025-9242, a WatchGuard Firebox Out-of-Bounds Write vulnerability, CVE-2025-12480, a Gladinet Triofox Improper Access Control vulnerability, and CVE-2025-62215, a Microsoft Windows Race Condition vulnerability), and reissued orders to federal agencies to patch Cisco vulnerabilities CVE-2025-20333 and CVE-2025-20362.
Akira Ransomware Group Targets Vulnerabilities for Initial Access
The CISA Akira advisory notes that in a June 2025 incident, Akira encrypted Nutanix Acropolis Hypervisor (AHV) virtual machine (VM) disk files for the first time, expanding the ransomware group’s abilities beyond VMware ESXi and Hyper-V by abusing CVE-2024-40766, a SonicWall vulnerability.
The updated advisory adds six new vulnerabilities exploited by Akira threat actors for initial access, including:
- CVE-2020-3580, a cross-site scripting (XSS) vulnerability in Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD)
- CVE-2023-28252, a Windows Common Log File System Driver Elevation of Privilege vulnerability
- CVE-2024-37085, a VMware ESXi authentication bypass vulnerability
- CVE-2023-27532, a Veeam Missing Authentication for Critical Function vulnerability
- CVE-2024-40711, a Veeam Deserialization of Untrusted Data vulnerability
- CVE-2024-40766, a SonicWall Improper Access Control vulnerability
“Akira threat actors gain access to VPN products, such as SonicWall, by stealing login credentials or exploiting vulnerabilities like CVE-2024-40766,” the CISA advisory said. In some cases, they gain initial access with compromised VPN credentials, possibly by using initial access brokers or brute-forcing VPN endpoints. The group also uses password spraying techniques and tools such as SharpDomainSpray to gain access to account credentials.
Akira threat actors have also gained initial access through the Secure Shell (SSH) protocol by exploiting a router’s IP address. “After tunneling through a targeted router, Akira threat actors exploit publicly available vulnerabilities, such as those found in the Veeam Backup and Replication component of unpatched Veeam backup servers,” the advisory said.
Akira’s Latest Discovery, Persistence and Evasion Tactics
Visual Basic (VB) scripts are frequently used by the group to execute malicious commands, and nltest /dclist: and nltest /DOMAIN_TRUSTS are used for network and domain discovery.
Akira threat actors abuse remote access tools such as AnyDesk and LogMeIn for persistence and to “blend in with administrator activity,” and Impacket is used to execute the remote command wmiexec.py and obtain an interactive shell. Akira threat actors also uninstall endpoint detection and response (EDR) systems to evade detection.
In one incident, Akira threat actors bypassed Virtual Machine Disk (VMDK) file protection by powering down the domain controller’s VM and copying the VMDK files to a newly created VM, CISA said. “This sequence of actions enabled them to extract the NTDS.dit file and the SYSTEM hive, ultimately compromising a highly privileged domain administrator’s account,” the advisory said.
Veeam.Backup.MountService.exe has also been used for privilege escalation (CVE-2024-40711), and AnyDesk, LogMeIn, RDP, SSH and MobaXterm have been used for lateral movement.
Akira actors have used tunneling utilities such as Ngrok for command and control (C2) communications, initiating encrypted sessions that bypass perimeter monitoring. PowerShell and Windows Management Instrumentation Command-line (WMIC) have also been used to disable services and execute malicious scripts.
Akira threat actors have been able to exfiltrate data in just over two hours from initial access, CISA said. The new Akira_v2 variant appends encrypted files with an .akira or .powerranges extension, or with .akiranew or .aki. A ransom note named fn.txt or akira_readme.txt appears in both the root directory (C:) and each user’s home directory (C:\Users).
CISA recommended a number of security best practices for combatting the Akira ransomware threat, including prioritizing remediating known exploited vulnerabilities, enforcing phishing-resistant multifactor authentication (MFA), and maintaining regular, tested offline backups of critical data.