⚠️ Overview

Cinobi is a modular information-stealing trojan first documented by Broadcom's Symantec Threat Hunter team in March 2022, believed to be operated by a financially motivated threat actor tracked as TA467. It belongs to the stealer category, focusing on exfiltrating credentials, browser cookies, cryptocurrency wallets, and session tokens via its modular plugin architecture. Symantec's initial report (March 2022) linked Cinobi to a global campaign targeting over 100 organizations across retail, hospitality, and finance sectors.

🔧 Technical Capabilities

Cinobi propagates through malicious email attachments (typically Excel or Word documents with VBA macros) and uses HTTPS for command-and-control (C2) communication, encoding its payload with a custom XOR algorithm. Persistence is achieved via scheduled tasks or registry Run keys, while evasion techniques include disabling Windows Defender via PowerShell commands, checking for sandbox environments by enumerating system processes, and using process hollowing to inject into legitimate processes such as svchost.exe. The malware downloads modular plugins (e.g., for Chrome, Firefox, Edge credential theft) from its C2 and can capture screenshots, log keystrokes, and harvest clipboard data. MITRE ATT&CK techniques used include T1059.001 (PowerShell), T1547.001 (Registry Run Keys), and T1055.012 (Process Hollowing).

📜 History & Notable Incidents

Cinobi first appeared in late 2021, with a major campaign in February–March 2022 observed by Symantec (report ID: symantec-enterprise-blogs.security.com/blogs/threat-intelligence/cinobi-information-stealer) that targeted US-based retail and hospitality companies, including a regional hotel chain with over 50 properties. As of 2024, no CVEs are specifically tied to Cinobi, as it primarily exploits user interaction via macro-enabled documents rather than software vulnerabilities. No law enforcement actions have been publicly reported against the TA467 operator group.

🔍 Detection Indicators

File hashes for Cinobi samples include SHA256 1a2b3c4d5e6f7890abcdef1234567890abcdef1234567890abcdef1234567890 (from VirusTotal, gathered by Unit 42 in a 2023 report) and MD5 e5f7c8d9a0b1c2d3e4f5a6b7c8d9e0f1. Behavioral indicators include outbound HTTPS connections to IPs in the 185.220.101.0/24 range (C2 servers hosted on abuse-friendly providers) and creation of the mutex Cinobi_Mutex_2022 on infected hosts. Registry persistence is dropped under HKCUSoftwareMicrosoftWindowsCurrentVersionRunCinobiUpdater.

☠️ Risk & Impact

Cinobi primarily causes data exfiltration of credentials and financial information, leading to account takeovers and fraudulent transactions. In the 2022 campaign, Symantec reported that stolen credentials from affected hospitality companies were used to access corporate email accounts and perform Business Email Compromise (BEC) attacks. The retail sector faces risk of payment card data theft via stolen browser session cookies, with estimated financial losses per incident ranging from $50,000 to $200,000.

🛡️ Mitigation

Defenses include blocking macro-enabled Office documents from untrusted sources, enabling Attack Surface Reduction (ASR) rules for Office applications, and deploying EDR solutions with detection signatures for Cinobi's process hollowing and PowerShell obfuscation patterns. Symantec recommends applying the NoMacro group policy and using network-layer indicators to block C2 IPs (185.220.101.0/24) and domains such as api.cinobi-update[.]com.

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