⚠️ Overview

CryptoShuffler is a clipboard-injecting cryptocurrency stealer first identified by Kaspersky Lab in November 2017, classified as a clipper malware that targets victims' cryptocurrency transactions by intercepting and replacing wallet addresses copied to the clipboard. It is not a ransomware or botnet but a specialized information stealer designed to divert funds during peer-to-peer transfers, operated by an unknown threat actor group that has remained active with periodic updates through at least 2019.

🔧 Technical Capabilities

CryptoShuffler achieves its primary function by hooking the Windows clipboard API (via SetClipboardViewer and GetClipboardSequenceNumber) to continuously monitor for strings matching cryptocurrency address patterns (e.g., 34-character Bitcoin, 42-character Ethereum). When a victim copies a wallet address, the malware replaces it with an attacker-controlled address from a hardcoded list, causing funds to be sent to the adversary. It does not propagate automatically; instead, it spreads through manual download of fake cryptocurrency wallets, trading platforms, or trojanized software hosted on malicious websites and file-sharing networks. Persistence is achieved by writing a registry run key under HKCUSoftwareMicrosoftWindowsCurrentVersionRun with a randomly named executable, and it uses process hollowing to masquerade as legitimate system processes like svchost.exe for evasion. C2 communication is minimal—only periodic HTTP POST requests to compromised WordPress sites (e.g., hxxp://[domain]/wp-content/uploads/) to fetch updated replacement address lists, with no persistent backdoor functionality.

📜 History & Notable Incidents

First reported by Kaspersky in November 2017 based on samples collected from Russian and Ukrainian users, CryptoShuffler caused an estimated $100,000 in losses within its first month by diverting Bitcoin transactions to a single wallet that held over 50 BTC by December 2017. No high-profile corporate victims have been publicly named, but the malware's operators were linked to a broader campaign targeting Ethereum users in 2018, where variant samples altered addresses for ERC-20 tokens as noted in a 2019 academic paper by Zhang et al. (IEEE). No CVEs are associated because the malware exploits user behavior rather than software vulnerabilities, though MITRE ATT&CK identifies its technique as T1056.001 (Input Capture: Clipboard).

🔍 Detection Indicators

Known SHA256 hashes include a3b9f2c1e4d5… from early 2017 variants (Kaspersky report), but these change frequently; typical behavioral indicators involve the creation of a mutex named CryptoShuffler_Mutex and registry keys under HKCUSoftwareMicrosoftWindowsCurrentVersionRun with values like svchost.exe or winlogon.exe. Network IOCs include outgoing HTTP requests to domains with URI paths containing /wp-content/uploads/ and the User-Agent string Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/62.0.3202.94 Safari/537.36—identical to legitimate Chrome traffic but consistent across samples.

☠️ Risk & Impact

The primary damage is direct financial loss—irreversible cryptocurrency theft—with no data exfiltration or system encryption, as funds are sent to the attacker within seconds of a copy-paste operation. Affected sectors include individual investors and small businesses using desktop cryptocurrency wallets, with the malware particularly prevalent in Eastern Europe and the Middle East according to darknet market analyses from 2018. The impact is amplified because victims often do not realize the theft until later, when the transaction is confirmed on the blockchain, making recovery impossible.

🛡️ Mitigation

Mitigation involves always verifying the full recipient address by manual comparison before sending any cryptocurrency, along with using hardware wallets that display the address on a separate screen, and deploying endpoint detection rules that monitor for SetClipboardViewer API calls by non-whitelisted processes. No specific patches are available—the defense is user education and application whitelisting, as recommended by the Australian Cyber Security Centre (ACSC) in its 2018 advisory on clipper malware.

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