Hardware Model Reconnaissance Via Wmic.EXE

Adversaries, particularly groups deploying infostealers like Kuraystealer, actively leverage legitimate built-in Windows utilities to perform reconnaissance without raising immediate suspicion. One such technique involves using wmic.exe with the csproduct command to query system hardware models, vendors, and versions. This method, identified in various threat reports including those detailing Kuraystealer's operations since at least 2023, allows attackers to quickly gather crucial details about the underlying infrastructure of compromised systems. This information is vital for post-exploitation activities, enabling tailored attacks, further exploitation based on specific hardware vulnerabilities, or confirming the value of a compromised system before proceeding with data exfiltration. The reliance on a native, often whitelisted, tool like WMIC makes detection challenging for defenders without specific process command-line logging and robust correlation rules.

Attack Chain

1. Initial Access: The victim downloads and executes a malicious payload, often disguised as legitimate software, initiating the Kuraystealer infection.
2. Execution: The Kuraystealer malware executes on the system, typically a .NET assembly, which then spawns child processes to perform its malicious activities.
3. System Information Discovery: The malware executes wmic.exe csproduct get name,vendor,version,identifyingnumber to gather detailed hardware model and vendor information about the compromised machine.
4. Additional Reconnaissance: Kuraystealer continues to use wmic.exe and other built-in commands to collect further system details, such as information about the processor, BIOS, and baseboard, to build a comprehensive system profile.
5. Data Collection: The infostealer actively searches for and collects sensitive data, including credentials from web browsers, cryptocurrency wallet files, and other specified personal information from the local system.
6. Data Staging and Exfiltration: Collected data is typically compressed into an archive (e.g., ZIP) and then exfiltrated to attacker-controlled infrastructure, often leveraging platforms like Discord webhooks.

Impact

The successful execution of WMIC for reconnaissance provides attackers with valuable insights into the target system's hardware, enabling them to customize subsequent attacks or determine the value of the compromised host. In the context of infostealers like Kuraystealer, this reconnaissance precedes the theft of sensitive data, including credentials, browser history, and cryptocurrency wallet information. This leads to severe financial and reputational damage for victims, as critical information is exfiltrated and potentially sold or misused. While specific victim counts for this particular reconnaissance technique are not isolated, the broader Kuraystealer campaigns have targeted a wide range of individuals and organizations globally, resulting in significant data breaches.

Recommendation

• Enable Sysmon process-creation logging to capture wmic.exe executions and their command-line arguments, which is essential for activating the rules below.
• Deploy the Sigma rules in this brief to your SIEM and tune for your environment, paying close attention to wmic.exe executions that include csproduct in their command line.
• Implement strong application whitelisting policies to prevent the execution of unauthorized infostealer payloads, which precede the use of wmic.exe for reconnaissance.