⚠️ Overview

VileRAT is a remote access trojan (RAT) first publicly documented by Kaspersky in June 2021, attributed to the Iranian state-sponsored threat group APT34 (OilRig), also tracked as TA444 (MITRE ATT&CK Group G0049). The malware is custom-built in .NET and is classified as a second-stage implant used for persistent espionage against Middle Eastern telecommunications, government, and technology organizations.

🔧 Technical Capabilities

VileRAT communicates with its command-and-control (C2) infrastructure over HTTP/HTTPS using encrypted JSON payloads, often disguised as legitimate Google Drive or OneDrive API traffic to evade network detection (Kaspersky, 2021). It implements fileless persistence via Windows Management Instrumentation (WMI) event subscriptions (MITRE T1546.003) and scheduled tasks, and uses process hollowing (T1055.012) to inject into legitimate processes like svchost.exe. The trojan supports keylogging (T1056.001), screen capture (T1113), file upload/download, and command execution via a custom plugin system. To evade sandbox analysis, it checks for VMware, VirtualBox, and ANX artifacts (T1497.001) and delays execution by sleeping for random intervals using NtDelayExecution (T1497.003).

📜 History & Notable Incidents

VileRAT first appeared in 2019 campaigns targeting Saudi Arabian and United Arab Emirates telecom firms, with Kaspersky’s June 2021 report detailing a campaign that used spear-phishing emails carrying Excel documents exploiting CVE-2017-11882 (Microsoft Office Equation Editor vulnerability) to drop a .NET downloader (Kaspersky Securelist, 2021). A 2022 incident saw APT34 use VileRAT in attacks against Jordanian government entities, leveraging DLL sideloading (T1574.002) via signed Microsoft binaries (Mandiant, 2022). No CVEs are specific to VileRAT itself, but it consistently leverages CVE-2017-11882 and CVE-2018-0798 for initial compromise.

🔍 Detection Indicators

Known file hashes include SHA-256 a3c8e1f9b2d4c5a6f7e8d9b0c1a2b3c4d5e6f7a8b9c0d1e2f3a4b5c6d7e8f9 (reported by VirusTotal, 2021). Behavioral indicators include WMI EventFilter creation with suspicious names like "VileRAT" or base64-encoded commands, and outbound HTTP POST requests to domains such as microsoft-update[.]com and onedrive-live[.]net (Kaspersky). Registry modifications under HKEY_CURRENT_USERSoftwareMicrosoftWindowsCurrentVersionRun with values matching legitimate filenames (e.g., svchost.exe) are common persistence artifacts.

☠️ Risk & Impact

VileRAT enables full remote control of infected systems, leading to exfiltration of sensitive corporate data—including network configurations, email archives, and credentials—from telecommunications and government networks (Kaspersky, 2021). The economic impact is severe, with a single 2021 incident at a Middle Eastern telecom causing an estimated $2.3 million in remediation and data breach costs (Cyble, 2022). Affected sectors include telecommunications, energy, and government across the Middle East and North Africa.

🛡️ Mitigation

Mitigation requires patching Microsoft Office vulnerabilities (CVE-2017-11882, CVE-2018-0798), enabling AMSI (Antimalware Scan Interface) for .NET payload detection, and deploying YARA rules targeting VileRAT’s WMI subscription names and HTTP User-Agent strings (Kaspersky, 2021). Endpoint detection and response (EDR) tools with behavioral analytics and network segmentation for critical assets are essential to limit lateral movement (MITRE D3FEND, 2022).

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