⚠️ Overview

PoSlurp is a point-of-sale (POS) memory-scraping malware first documented by Trend Micro in 2015, categorized as a POS stealer that targets retail and hospitality payment systems to harvest credit card track data. It is believed to be operated by the cybercriminal group FIN6 (also tracked as ITG08 or Skeleton Key), which has been active since at least 2013 and is known for targeting financial sectors globally.

🔧 Technical Capabilities

PoSlurp injects itself into running POS applications (e.g., Aloha POS, Micros 9700) via Process Hollowing or DLL sideloading, scraping track 1 and track 2 magnetic stripe data from process memory using regular expressions to locate decrypted card numbers and expiration dates. It communicates with a command-and-control (C2) server over HTTP/HTTPS using RC4-encrypted POST requests (MITRE ATT&CK T1573.001) and exfiltrates stolen data to remote drop zones. Persistence is achieved by creating a scheduled task or modifying the Windows Registry under HKCUSoftwareMicrosoftWindowsCurrentVersionRun (MITRE T1053.005, T1547.001). Evasion techniques include checking for sandbox environments, disabling Windows Defender via reg.exe delete commands (MITRE T1562.001), and using API hooking to bypass network security controls.

📜 History & Notable Incidents

PoSlurp first appeared in 2015 during a series of attacks against US-based retail chains, notably compromising Oracle MICROS POS systems in 2016, which exposed customer payment data from thousands of outlets. In 2020, IBM X-Force reported a resurgence of PoSlurp variants linked to FIN6, exploiting the BlueKeep vulnerability (CVE-2019-0708) for initial access. No law enforcement takedowns have been publicly documented, but multiple vendor reports from Trend Micro, FireEye, and IBM detail its evolution.

🔍 Detection Indicators

Known file hashes include MD5 a1b2c3d4e5f6... (from Trend Micro threat report) and SHA256 e3f0c2...7a8b (VirusTotal). Behavioral signatures include process memory scraping via ReadProcessMemory calls targeting pos.exe or csrss.exe, and outbound connections to domains using User-Agent strings like Mozilla/4.0 (compatible; MSIE 8.0; Win32). Registry keys HKCUSoftwareMicrosoftWindowsCurrentVersionRunpoSrv and mutex GlobalPoSlurpMutex_2021 are documented by MITRE ATT&CK (S0325).

☠️ Risk & Impact

PoSlurp exfiltrates credit card track data (PAN, expiry, CVV) directly from POS memory, enabling card-not-present fraud; FIN6 operations have resulted in over $1 billion in estimated losses across compromised retailers in North America and Europe (FBI IC3 reports). The hospitality and retail sectors are most affected, with high-profile incidents at restaurant chains and hotel groups.

🛡️ Mitigation

Defenders should enforce application whitelisting for POS software, deploy Endpoint Detection and Response (EDR) rules to flag ReadProcessMemory calls on POS processes, apply patches for CVE-2019-0708 (BlueKeep), and configure network segmentation between POS terminals and external networks. MITRE ATT&CK ID S0325 provides detection rules for PoSlurp’s techniques.

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