⚠️ Overview

Odinaff is a backdoor trojan first identified by Symantec in March 2016, operated by a financially motivated cybercriminal group also tracked as Odinaff. It belongs to the category of targeted financial malware designed to steal credentials and sensitive data from banking systems, distinct from ransomware or botnets.

🔧 Technical Capabilities

Odinaff propagates via spear-phishing emails containing malicious Excel documents with obfuscated VBA macros that download the primary payload from remote servers. The backdoor communicates with command-and-control (C2) infrastructure over HTTP using RC4-encrypted packets, and establishes persistence by adding a registry run key under HKCUSoftwareMicrosoftWindowsCurrentVersionRun. Evasion techniques include checking for sandbox environments, using anti-debugging routines, and encrypting configuration data with a hardcoded key. The malware can execute arbitrary shell commands, capture screenshots, enumerate processes, and upload files, while its modular design allows loading additional plugins such as a keylogger or a memory scraper as reported by Symantec’s 2016 threat analysis.

📜 History & Notable Incidents

First observed in 2015, the Odinaff campaign primarily targeted financial institutions in the United States and Europe. A high-profile incident involved the compromise of a bank’s SWIFT messaging system in 2016, enabling the theft of funds without direct transaction manipulation. The group also used the Bateleur loader and PowerShell scripts to deliver secondary payloads, but no unique CVEs have been attributed to Odinaff as it relies on social engineering and macro-based execution vectors.

🔍 Detection Indicators

Symantec reported specific MD5 file hashes including 4a6f7c8b9d0e1f2a3b4c5d6e7f8a9b0c (example; real hashes available in the vendor’s report). Known behavioral indicators include the mutex name Odin_semaphore and registry persistence keys. Network IOCs display C2 domains with patterns like *.odinaff.[tld] and User-Agent strings mimicking outdated Internet Explorer versions.

☠️ Risk & Impact

Odinaff causes direct financial losses by exfiltrating SWIFT credentials and online banking credentials, allowing attackers to initiate fraudulent transactions. The primary impacted sectors are banking and finance, particularly credit unions and regional banks lacking robust advanced threat defenses. A single successful intrusion led to multi-million dollar losses according to industry reports.

🛡️ Mitigation

Defenders should deploy email filtering to block macro-enabled Office documents, enforce application whitelisting, and monitor for the unique mutex and registry indicators. Endpoint detection and response (EDR) solutions configured to detect process injection and anomalous PowerShell usage can effectively intercept Odinaff’s execution chains as recommended by Symantec.

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