110個組織遭勒索軟體Akira鎖定,利用思科SSL VPN漏洞入侵,加密Windows、Linux電腦檔案
· 2023-09-26

資安業者Logpoint提出警告,在駭客鎖定思科SSL VPN漏洞CVE-2023-20269入侵目前組織後,勒索軟體Akira攻擊態勢持續延燒,上個月成為前10大的勒索軟體家族

研究人員指出,一旦駭客得到內部網路的存取權限,就會使用遠端桌面連線工具AnyDesk、RustDesk,以及壓縮軟體WinRAR來進行後續攻擊行動,並且利用系統資訊工具PC Hunter及wmiexec橫向移動。

此外,為了讓檔案加密工作能順利執行,駭客會停用Windows內建的防毒軟體即時監控功能,並使用PowerShell下達刪除磁碟區陰影複製服務(VSS)的備份檔案。此外,這些駭客也開發了Linux版的加密程式,可用來加密VMware ESXi虛擬機器的檔案,進行綁架勒贖。

勒索軟體駭客採取寄生攻擊(LOLBins)手法,利用企業組織內現成的應用程式,執行攻擊行動,來迴避資安系統偵測的情況可說是非常普遍,其中,有許多駭客組織,如:LockBit、BlackByte,以及專門針對SQL Server的勒索軟體FreeWorld,濫用遠端桌面連線工具AnyDesk來存取受害主機,Akira也不例外。

但值得留意的是,這些駭客還運用另一款開源、跨平臺的遠端桌面連線工具RustDesk,而有可能架設自己的基礎設施架構,或是利用其內建的點對點(P2P)連線功能,讓攻擊行動變得更為隱密。

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