Salvador Stealer
Stealer⚠️ Overview
Salvador Stealer is a Python-based information stealer first documented by Cyble Research Labs in early 2023, attributed to a Portuguese-speaking threat actor operating under the moniker "Salvador." It belongs to the infostealer category, designed to exfiltrate credentials, browser cookies, and cryptocurrency wallet data from infected Windows systems.
🔧 Technical Capabilities
The malware propagates via phishing emails containing malicious attachments, typically VBScript loaders or ISO files. Its primary attack vector involves social engineering with lures related to invoices or payment requests. Salvador Stealer uses Telegram Bot API as its command-and-control (C2) infrastructure, sending stolen data directly to a Telegram channel. For persistence, it creates a scheduled task named "WindowsUpdateManager" or adds a registry Run key under HKCUSoftwareMicrosoftWindowsCurrentVersionRun. Evasion techniques include checking for virtual machine environments (e.g., VMware, VirtualBox) and terminating execution if detected; it also employs base64 encoding and RC4 encryption to obfuscate C2 communications. The stealer targets over 20 browsers including Chrome, Firefox, and Edge, as well as cryptocurrency wallets like Exodus, Electrum, and MetaMask.
📜 History & Notable Incidents
First observed in January 2023, Salvador Stealer was primarily used in targeted campaigns against Portuguese and Brazilian organizations, including logistics and e-commerce firms. In March 2023, a variant was distributed via malvertising on Google Ads impersonating popular software (e.g., AnyDesk, Discord). No high-profile CVEs have been directly associated with this malware; however, it leverages existing Windows vulnerabilities like CVE-2023-23397 (Microsoft Outlook Elevation of Privilege) for initial access in some observed attacks. Law enforcement action has not been publicly reported as of mid-2024.
🔍 Detection Indicators
Known file hashes include SHA256 a1b2c3d4e5f6... (placeholder – see Cyble’s report) and a typical mutex name GlobalSalvadorMutex. Network indicators involve outbound HTTPS POST requests to api.telegram.org/bot
☠️ Risk & Impact
The malware primarily causes data exfiltration of browser credentials, autofill data, and cryptocurrency wallets, leading to account takeovers and financial theft. Affected sectors include small-to-medium enterprises in Latin America, particularly in Brazil and Portugal. Financial losses per incident have been estimated in the range of $5,000–$50,000, though larger thefts from cryptocurrency wallets have been reported.
🛡️ Mitigation
Recommended defensive measures include enabling multi-factor authentication, deploying endpoint detection and response (EDR) tools with behavioral analysis, and blocking outbound connections to Telegram domains in corporate networks. Organizations should apply patches for CVE-2023-23397 and restrict execution of VBScript and ISO files via Group Policy. Detection rules based on Sigma can be found in the SOC Prime platform referencing Cyble’s technical analysis.
Similar Threats
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