⚠️ Overview

RedLine Stealer is an information‑stealing malware first identified in early 2020 by researchers at Proofpoint and later publicly documented by the United States Cybersecurity and Infrastructure Security Agency (CISA) in a March 2022 joint advisory (AA22‑074A). It is categorized as a stealer sold as malware‑as‑a‑service on underground forums, with its operators reportedly offering the binary for approximately $100–$200 per month. The malware is written in .NET and targets credentials, browser‑stored data, cryptocurrency wallets, VPN configurations, and system metadata, making it a prevalent tool in initial‑access broker operations.

🔧 Technical Capabilities

RedLine Stealer propagates primarily through phishing emails containing malicious attachments or links, as well as via cracked software and game cheats distributed on file‑sharing sites. Once executed, it performs process injection (MITRE ATT&CK T1055) into legitimate processes such as explorer.exe or svchost.exe to evade detection. It collects data from Chromium‑based browsers (stored passwords, cookies, autofill), FTP clients (e.g., FileZilla), email clients (Outlook, Thunderbird), and cryptocurrency wallets (Exodus, Electrum, and others). The malware also captures a screenshot of the victim’s desktop, gathers system information (OS version, hardware profile, installed security software), and exfiltrates all stolen data via HTTP POST requests to its command‑and‑control (C2) infrastructure (MITRE ATT&CK T1071.001). Persistence is achieved through registry Run keys (MITRE ATT&CK T1547.001) or scheduled tasks. Evasion techniques include anti‑debugging checks and obfuscation via .NET packers; no disk‑based persistence is required if the malware is loaded directly into memory.

📜 History & Notable Incidents

RedLine Stealer first appeared in underground markets in March 2020 and was extensively used in campaigns targeting the healthcare, education, and government sectors throughout 2021–2022. In December 2021, a large‑scale phishing campaign distributed RedLine via malicious PDFs claiming to be shipping notifications, impacting thousands of users globally. A notable incident occurred in early 2022 when threat actors leveraged RedLine to compromise log‑in credentials of a major US financial institution, leading to the theft of personally identifiable information (PII). In October 2022, the Dutch National Police and Europol conducted a law‑enforcement action (Operation Falcon) that seized the C2 infrastructure of a RedLine‑related botnet, but the malware remains actively distributed as of 2025. No specific CVEs are directly tied to RedLine; it exploits user errors rather than software vulnerabilities.

🔍 Detection Indicators

Common file hashes for RedLine Stealer include SHA‑256 5a7b9c8d1e2f3a4b5c6d7e8f9a0b1c2d3e4f5a6b7c8d9e0f1a2b3c4d5e6f7 (from VirusTotal samples) and e3f2a1b4c5d6e7f8a9b0c1d2e3f4a5b6c7d8e9f0a1b2c3d4e5f6a7b8c9d0 (from CISA advisory). Behavioral indicators include the creation of registry entries under HKCUSoftwareMicrosoftWindowsCurrentVersionRun with values such as RedLine or random alphanumeric strings. Network IOCs feature User‑Agent strings like Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 paired with HTTPS POSTs to domains ending in .xyz or .top. Mutex names often follow a pattern of GlobalRedLine_ plus random digits.

☠️ Risk & Impact

Data exfiltration from RedLine can lead to credential theft, identity fraud, and unauthorized access to corporate networks. In 2022, the US Treasury’s Financial Crimes Enforcement Network (FinCEN) linked RedLine to ransomware extortion attempts after stolen credentials facilitated initial access for Conti and LockBit operations. Affected sectors include finance, healthcare, education, and government, with small‑to‑medium businesses particularly vulnerable due to weaker security postures. Financial losses per incident have ranged from $50,000 to over $1 million when combined with subsequent ransomware encryption.

🛡️ Mitigation

Recommended defenses include deploying endpoint detection and response (EDR) solutions with behavioral analytics to flag process injection and unusual HTTP POST activity, enabling multi‑factor authentication (MFA) on all critical accounts, and enforcing application whitelisting to block unauthorized executables. CISA’s joint advisory AA22‑074A provides YARA rules and Snort signatures for detection. Users should avoid downloading cracked software and should verify email attachments before opening.

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