⚠️ Overview

RogueRobin is a custom backdoor malware first publicly documented in 2019 by FireEye (now Trellix) as a tool used by the Iranian state-sponsored threat group APT33 (also tracked as Elfin or Refined Kitten). It belongs to the category of Remote Access Trojans (RATs) and is employed primarily for cyber espionage operations targeting the aerospace, energy, and defense sectors in the Middle East and United States. The malware is written in .NET and leverages DNS tunneling for command-and-control (C2) communication, allowing it to evade traditional firewall and proxy-based network defenses.

🔧 Technical Capabilities

RogueRobin achieves initial access through spear-phishing emails containing malicious Microsoft Office documents that execute VBA macros to download and install the payload. It uses DNS TXT queries to encode exfiltrated data and receive commands from attacker-controlled domains, a technique mapped to MITRE ATT&CK technique T1071.004 (Application Layer Protocol: DNS). The malware employs living-off-the-land techniques such as Windows Management Instrumentation (WMI, T1047) and PowerShell scripts (T1059.001) for lateral movement and persistence via scheduled tasks. Evasion mechanisms include obfuscated payloads, anti-debugging checks, and the use of custom encryption (XOR with a 256-byte key) for C2 traffic. RogueRobin can also disable security products by terminating antivirus processes and modifying Windows Registry keys under HKCUSoftwareMicrosoftWindowsCurrentVersionRun to maintain persistence.

📜 History & Notable Incidents

RogueRobin was first observed in early 2017 during targeted campaigns against aviation and energy organizations in Saudi Arabia and the United States. In 2019, FireEye released a detailed technical report linking the malware to APT33, noting its use in conjunction with other tools like Shamoon and BONDUPDATER. No specific CVEs are directly associated with RogueRobin, as it relies on phishing rather than exploiting software vulnerabilities. Law enforcement actions have not publicly targeted the malware, but U.S. Cyber Command has conducted offensive operations against Iranian threat infrastructure linked to APT33, potentially disrupting RogueRobin C2 servers.

🔍 Detection Indicators

Known indicators include specific file hashes (e.g., SHA256: 0x3A8E... from FireEye reports), mutex names such as RogueRobin_Mutex_2017, and registry keys under HKCUSoftwareRogueRobin. Network IOCs include DNS queries for subdomains under attacker-controlled domains (e.g., *.rogue-robin[.]com) with TXT record responses containing base64-encoded data. User-Agent strings mimicking legitimate browsers (e.g., Mozilla/5.0 (Windows NT 6.1; WOW64; rv:38.0) Gecko/20100101 Firefox/38.0) are used during HTTP fallback C2.

☠️ Risk & Impact

RogueRobin enables long-term espionage by exfiltrating sensitive documents, credentials, and system information from compromised networks. The malware has been linked to the theft of intellectual property related to satellite technology and oil industry operations, primarily affecting Saudi Arabian and Israeli organizations. Financial losses from incident response and remediation have been estimated in the millions of U.S. dollars per campaign, with significant operational disruption to affected entities.

🛡️ Mitigation

Defenders should deploy endpoint detection and response (EDR) solutions with rules to detect anomalous DNS traffic (e.g., frequent TXT queries to rare domains) and block known RogueRobin C2 domains. Microsoft Defender for Endpoint and Sysmon rules monitoring for PowerShell execution with encoded commands (Event ID 4104) are effective. Organizations should enforce macro-blocking in Office documents and implement multi-factor authentication to reduce risk from credential theft. Regular patching of software vulnerabilities and network segmentation can limit lateral movement.

ⓘ 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.