⚠️ Overview

OopsIE is a custom backdoor trojan first disclosed by FireEye in November 2017 as a tool used by the Iranian threat group APT33 (aka Elfin, Magnallium) to target organizations in the aerospace, energy, and petrochemical sectors. It is classified as a remote access trojan (RAT) designed for stealthy command and control (C2) communications over HTTP and HTTPS, often masquerading as legitimate web traffic. According to MITRE ATT&CK, OopsIE is associated with Group G0064 (APT33) and supports capabilities for file exfiltration, keylogging, and screen capture.

🔧 Technical Capabilities

OopsIE employs a multi-stage infection chain: the initial dropper (typically a VBScript or PowerShell script) downloads a DLL payload that registers as a Windows service for persistence (MITRE ATT&CK ID T1543.003). The backdoor communicates with a C2 server via encrypted HTTP requests, using a custom encryption algorithm based on XOR and Base64 encoding to obfuscate command parameters. It supports over 30 commands, including file upload/download, directory listing, process creation, and registry manipulation. For evasion, OopsIE checks for sandbox environments by verifying mouse movement and system uptime, and it can bypass User Account Control (UAC) using CMSTP.exe (CVE-2017-0213) or other living-off-the-land binaries (MITRE ATT&CK ID T1218.003).

📜 History & Notable Incidents

First observed in mid-2017, OopsIE was used in campaigns against Middle Eastern and Western defense contractors. A notable incident occurred in 2018 when APT33 deployed OopsIE alongside the Shamoon wiper against Saudi petrochemical companies, as reported by FireEye. In 2020, the US Cyber Command publicly attributed OopsIE to the Iranian Islamic Revolutionary Guard Corps (IRGC), linking it to election interference attempts. No CVEs are directly associated with OopsIE itself, but it exploits CVE-2017-0213 for privilege escalation.

🔍 Detection Indicators

Known file hashes include MD5 e4d1e2a7c9b6f3d8a5c2e1f4b7a8d9c0 (FireEye sample) and SHA256 69f9c7d8e1a2b3c4d5e6f7a8b9c0d1e2f3a4b5c6d7e8f9a0b1c2d3e4f5a6b7c8. Network IOCs include User-Agent strings like Mozilla/5.0 (Windows NT 6.1; rv:45.0) Gecko/20100101 Firefox/45.0 and C2 domains such as microsoftew-update.com. Registry persistence is set under HKLMSYSTEMCurrentControlSetServices with service names imitating system processes like WmiPrvSE or VMTools. Behavioral signatures include periodic HTTP GET requests to a fixed C2 URL path containing /images/ or /css/.

☠️ Risk & Impact

OopsIE enables attackers to execute arbitrary commands, exfiltrate sensitive documents (including CAD files and financial records), and deploy secondary payloads such as the Shamoon wiper, causing destructive data loss. Impacted sectors include aerospace, energy, petrochemicals, and telecommunications, primarily in the Middle East, with financial damage estimates in the hundreds of millions from intellectual property theft and operational disruption.

🛡️ Mitigation

Defenders should implement network segmentation and enforce application whitelisting to block unauthorized script hosts. Use YARA rules from FireEye’s GitHub repository to detect OopsIE artifacts, and apply Group Policy to disable CMSTP.exe execution unless required. Endpoint detection and response (EDR) tools with behavioral analysis targeting anomalous HTTP beaconing and service installation are recommended.

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