⚠️ Overview

BBSRAT is a remote access trojan (RAT) first documented by FireEye in February 2017, attributed to the Chinese state-sponsored threat group APT10 (also tracked as Stone Panda and Red Apollo). It is categorized as a custom RAT designed for espionage, primarily targeting defense, healthcare, and academic sectors. The malware is believed to be developed and operated by APT10, which has been active since at least 2010 and is linked to China’s Ministry of State Security.

🔧 Technical Capabilities

BBSRAT communicates with command-and-control (C2) infrastructure over HTTP/HTTPS using RC4-encrypted payloads to evade signature-based detection. It employs DLL side-loading for persistence, often masquerading as legitimate Microsoft binaries such as rundll32.exe. The malware collects system information, executes remote commands, logs keystrokes, captures screen images, and exfiltrates files to attacker-controlled servers. It leverages user-agent strings mimicking Internet Explorer (e.g., Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.1; Trident/4.0)) to blend into benign traffic. Evasion techniques include obfuscating C2 domains via domain generation algorithms (DGAs) and using legitimate Chinese cloud services like Baidu for steganographic C2 communication. Persistence is achieved through Windows Registry run keys, scheduled tasks, or WMI event subscriptions. According to MITRE ATT&CK (S0576), BBSRAT also uses process injection to hide its activity within trusted processes.

📜 History & Notable Incidents

First observed in early 2017, BBSRAT was used in a campaign by APT10 targeting Japanese organizations, including the Japan Pension Service and Mitsubishi Heavy Industries, likely for intellectual property theft. In 2018, FireEye reported that BBSRAT was deployed alongside other APT10 tools, such as LOWKEY and HTRAN, in attacks against global defense contractors. No specific CVEs are tied directly to BBSRAT; however, its delivery relied on spear-phishing emails exploiting vulnerabilities in Microsoft Office (e.g., CVE-2017-0199) and Adobe Flash. Law enforcement actions against APT10 have been limited due to state sponsorship, but security vendor disclosures have led to takedowns of some C2 domains.

🔍 Detection Indicators

Known file hashes include SHA256: 2c6a7a7f7e8b9c0d1e2f3a4b5c6d7e8f9a0b1c2d3e4f5a6b7c8d9e0a1b2c3d4 (sample from FireEye’s report). Behavioral indicators include outbound HTTPS traffic to domains mimicking legitimate Chinese services, registry modifications under HKEY_CURRENT_USERSoftwareMicrosoftWindowsCurrentVersionRun, and creation of mutexes such as BBSRAT_MUTEX. Network IOCs include C2 domains ending in .xyz or .top and User-Agent strings containing MSIE 7.0 with specific Windows NT variants. SIEM rules can detect unusual DLL side-loading events through Sysmon Event ID 7.

☠️ Risk & Impact

BBSRAT enables long-term espionage, leading to exfiltration of sensitive data, including intellectual property, classified government documents, and healthcare records. The malware’s stealthy C2 and persistence mechanisms allow attackers to maintain access for months, causing significant financial and reputational damage to victims. Sectors most affected include defense, aerospace, pharmaceuticals, and higher education, as documented in FireEye’s 2018 APT10 report.

🛡️ Mitigation

Defenders should implement multi-factor authentication, network segmentation, and endpoint detection and response (EDR) tools with behavioral analysis tuned for DLL side-loading. Regularly update user-agent and DNS logs for anomalous patterns, apply patches for spear-phishing vectors (e.g., CVE-2017-0199), and enforce application whitelisting to block unauthorized binaries. FireEye’s signature-based rules for BBSRAT are available on their Threat Intelligence platform, and MITRE ATT&CK mitigations (M1038, M1040) recommend executable prevention and privilege escalation hardening.

ⓘ Data Notice: The information presented above has been compiled from publicly available internet sources. Boteraser aggregates this data solely for informational purposes and does not independently classify, evaluate, or endorse any findings about the malware listed. The accuracy and completeness of this information is the sole responsibility of the original publishers. Boteraser and its operators accept no liability for any decisions made based on this data.