Software: Duqu

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Duqu
Software
ID S0038
Aliases Duqu
Type Malware

Duqu is a malware platform that uses a modular approach to extend functionality after deployment within a target network.1

Techniques Used

  • New Service - Duqu creates a new service that loads a malicious driver when the system starts. When Duqu is active, the operating system believes that the driver is legitimate, as it has been signed with a valid private key.1
  • Process Injection - Duqu will inject itself into different processes to evade detection. The selection of the target process is influenced by the security software that is installed on the system (Duqu will inject into different processes depending on which security suite is installed on the infected host).1
  • Commonly Used Port - Duqu uses a custom command and control protocol that communicates over commonly used ports, and is frequently encapsulated by application layer protocols.1
  • Standard Application Layer Protocol - Duqu uses a custom command and control protocol that communicates over commonly used ports, and is frequently encapsulated by application layer protocols.1
  • Custom Command and Control Protocol - Duqu is capable of using its command and control protocol over port 443. However, Duqu is also capable of encapsulating its command protocol over standard application layer protocols. The Duqu command and control protocol implements many of the same features as TCP and is a reliable transport protocol.1
  • Data Obfuscation - When the Duqu command and control is operating over HTTP or HTTPS, Duqu uploads data to its controller by appending it to a blank JPG file.1
  • Connection Proxy - Duqu can be configured to have commands relayed over a peer-to-peer network of infected hosts if some of the hosts do not have Internet access.1
  • Data Staged - Modules can be pushed to and executed by Duqu that copy data to a staging area, compress it, and XOR encrypt it.1
  • Data Encrypted - Modules can be pushed to and executed by Duqu that copy data to a staging area, compress it, and XOR encrypt it.1
  • Data Compressed - Modules can be pushed to and executed by Duqu that copy data to a staging area, compress it, and XOR encrypt it.1
  • Account Discovery - The discovery modules used with Duqu can collect information on accounts and permissions.1
  • Process Discovery - The discovery modules used with Duqu can collect information on process details.1
  • Windows Admin Shares - Adversaries can instruct Duqu to spread laterally by copying itself to shares it has enumerated and for which it has obtained legitimate credentials (via keylogging or other means). The remote host is then infected by using the compromised credentials to schedule a task on remote machines that executes the malware.1
  • Valid Accounts - Adversaries can instruct Duqu to spread laterally by copying itself to shares it has enumerated and for which it has obtained legitimate credentials (via keylogging or other means). The remote host is then infected by using the compromised credentials to schedule a task on remote machines that executes the malware.1
  • Scheduled Task - Adversaries can instruct Duqu to spread laterally by copying itself to shares it has enumerated and for which it has obtained legitimate credentials (via keylogging or other means). The remote host is then infected by using the compromised credentials to schedule a task on remote machines that executes the malware.1
  • Access Token Manipulation - Duqu examines running system processes for tokens that have specific system privileges. If it finds one, it will copy the token and store it for later use. Eventually it will start new processes with the stored token attached. It can also steal tokens to acquire administrative privileges.2