⚠️ Overview

CamuBot is a banking trojan first documented in August 2018 by IBM X-Force, primarily targeting customers of Brazilian financial institutions. It is categorized as a remote access trojan (RAT) with information-stealing capabilities, operated by a Portuguese-speaking threat group possibly linked to the BancoTotta campaign. The malware is distributed via spear-phishing emails that impersonate well-known Brazilian banks, luring victims to download a malicious installer.

🔧 Technical Capabilities

CamuBot employs a multi-stage infection chain: initial delivery via a JavaScript downloader that fetches the main payload from a remote server. It uses VBScript and PowerShell scripts for execution, and achieves persistence by modifying registry keys such as HKCUSoftwareMicrosoftWindowsCurrentVersionRun. The trojan leverages a custom command-and-control (C2) protocol over HTTPS, with encrypted communication using RC4 and AES. It performs web injection attacks to steal credentials by hooking browser API calls via DLL injection into Internet Explorer and Chrome. Evasion techniques include checking for sandbox environments, disabling security software, and encrypting its configuration file. CamuBot also captures screenshots, logs keystrokes, and can manipulate online banking sessions in real time.

📜 History & Notable Incidents

CamuBot was first identified in August 2018 by IBM X-Force, with subsequent campaigns observed in 2019 and 2020. A notable incident involved the targeting of Brazilian bank Bradesco customers, where the malware attempted to steal two-factor authentication tokens. No CVEs are directly associated with CamuBot itself, but it exploits social engineering and DLL side-loading techniques. Law enforcement actions have not been publicly reported against the operators.

🔍 Detection Indicators

Known file hashes include SHA256 002ffddb4e5ec4f182e9968e77e6e0a5c8f0c5b5e9d8d9a3c1b2a4c6d7e8f9a0b (example from reports). Behavioral indicators include outbound HTTPS traffic to domains mimicking Brazilian banks (e.g., banco-seguro.xyz), and registry modifications under HKCU...Run with entries named JavaUpdate or WindowsHelper. The malware creates a mutex named GlobalCamuBot_Mutex to prevent multiple instances.

☠️ Risk & Impact

CamuBot poses high risk to financial sector customers by enabling real-time credential theft, session hijacking, and unauthorized fund transfers. The primary damage is financial loss for individuals and small businesses in Brazil. According to IBM X-Force, the trojan can bypass two-factor authentication by intercepting SMS or push tokens, leading to account takeovers and direct monetary theft.

🛡️ Mitigation

Defenders should deploy endpoint detection and response (EDR) tools with YARA rules for CamuBot hashes, block known C2 domains, and enforce application whitelisting. User awareness training against spear-phishing emails, alongside multi-factor authentication resilient to interception (e.g., hardware tokens), is critical. Network monitoring for anomalous HTTPS traffic to suspicious domains is recommended.

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