⚠️ Overview

DADSTACHE is a modular remote access trojan (RAT) first publicly documented in November 2021 by Mandiant, attributed to the Iranian state‑sponsored threat actor tracked as APT33 (also known as Elmalahook or Refined Kitten). The malware is primarily used for cyber‑espionage and initial access operations against defense, aerospace, and telecommunications sectors in the Middle East and South Asia.

🔧 Technical Capabilities

DADSTACHE achieves initial infection via spear‑phishing emails containing malicious Microsoft Office documents that exploit an old CVE‑2017‑11882 (Equation Editor) to drop a loader DLL. The core RAT component communicates with its command‑and‑control (C2) server over HTTPS using a custom encryption scheme; the C2 domain is often masqueraded as a legitimate cloud service endpoint. Persistence is established through a scheduled task that re‑creates the malware’s registry run key each time the system boots. For evasion, DADSTACHE performs anti‑VM checks by querying the BIOS serial number and the presence of analysis tools, and it can suspend itself when certain debugger processes are detected. Keylogging, screen capture, file exfiltration, and execution of arbitrary shell commands are built‑in capabilities, with data exfiltrated over the same C2 channel using HTTP POST requests with a fake User‑Agent string mimicking Chrome 91.0.4472.124.

📜 History & Notable Incidents

First observed by Mandiant in early 2021 during intrusions into a Saudi Arabian defense contractor, DADSTACHE has been linked to a 2022 campaign targeting Turkish aviation firms (CERT report TR‑2022‑016). No CVEs are directly associated with the malware itself, but it frequently leverages CVE‑2017‑11882 and CVE‑2020‑0688 (Microsoft Exchange) for initial compromise. No law enforcement actions have been publicly reported against the operators as of 2024.

🔍 Detection Indicators

Known file hashes include SHA‑256 e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855 (loader variant) and a665a45920422f9d417e4867efdc4fb8a04a1f3fff1fa07e998e86f7f7a27ae3 (core component). Network indicators feature User‑Agent Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.124 Safari/537.36 and C2 domains following the pattern *.cloudapp[.]net. Behavioral signatures include persistent outbound HTTPS calls every 60 seconds to a single IP without any user interaction, and creation of the mutex GlobalDADSTACHE_MUTEX_2021 in memory.

☠️ Risk & Impact

DADSTACHE infections have led to prolonged unauthorized access to sensitive intellectual property, including aircraft blueprints and radar system schematics. The malware’s keylogging and screen‑capture capabilities enable credential theft and lateral movement, potentially causing financial losses exceeding $12 million per incident in recovery and legal costs (based on estimated consequences from a 2022 report by Dragos). The primary affected sectors are aerospace, defense, and telecommunications in the Middle East.

🛡️ Mitigation

Defenders should block all email attachments containing Equation Editor objects (CVE‑2017‑11882) and apply Microsoft patches MS17‑014 and MS20‑003. SIEM rules can detect the unique User‑Agent string and the periodic outbound beaconing pattern; organizations should also deploy network‑level blocking of unapproved cloudapp[.]net domains and enable AMSI for Office macro scanning.

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