Xbash
Xbash is a malware family that has targeted Linux and Microsoft Windows servers. The malware has been tied to the Iron Group, a threat actor group known for previous ransomware attacks.Xbash was developed in Python and then converted into a self-contained Linux ELF executable by using PyInstaller.[1]
Techniques Used
| Domain | ID | Name | Use | |
|---|---|---|---|---|
| Enterprise | T1071 | .001 | Application Layer Protocol:Web Protocols | |
| Enterprise | T1547 | .001 | Boot or Logon Autostart Execution:Registry Run Keys / Startup Folder | Xbash can create a Startup item for persistence if it determines it is on a Windows system.[1] |
| Enterprise | T1110 | .001 | Brute Force:Password Guessing | Xbash can obtain a list of weak passwords from the C2 server to use for brute forcing as well as attempt to brute force services with open ports.[1][2] |
| Enterprise | T1059 | .001 | Command and Scripting Interpreter:PowerShell | Xbash can use scripts to invoke PowerShell to download a malicious PE executable or PE DLL for execution.[1] |
| .005 | Command and Scripting Interpreter:Visual Basic | Xbash can execute malicious VBScript payloads on the victim’s machine.[1] | ||
| .007 | Command and Scripting Interpreter:JavaScript | Xbash can execute malicious JavaScript payloads on the victim’s machine.[1] | ||
| Enterprise | T1485 | Data Destruction | Xbash has destroyed Linux-based databases as part of its ransomware capabilities.[1] | |
| Enterprise | T1486 | Data Encrypted for Impact | Xbash has maliciously encrypted victim's database systems and demanded a cryptocurrency ransom be paid.[1] | |
| Enterprise | T1203 | Exploitation for Client Execution | Xbash can attempt to exploit known vulnerabilities in Hadoop, Redis, or ActiveMQ when it finds those services running in order to conduct further execution.[1][2] | |
| Enterprise | T1105 | Ingress Tool Transfer | Xbash can download additional malicious files from its C2 server.[1] | |
| Enterprise | T1046 | Network Service Discovery | ||
| Enterprise | T1053 | .003 | Scheduled Task/Job:Cron | Xbash can create a cronjob for persistence if it determines it is on a Linux system.[1] |
| Enterprise | T1218 | .005 | System Binary Proxy Execution:Mshta | |
| .010 | System Binary Proxy Execution:Regsvr32 | |||
| Enterprise | T1016 | System Network Configuration Discovery | Xbash can collect IP addresses and local intranet information from a victim’s machine.[1] | |
| Enterprise | T1102 | .001 | Web Service:Dead Drop Resolver | Xbash can obtain a webpage hosted on Pastebin to update its C2 domain list.[1] |