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Group-IB research splash graphic introducing analysis of the KGB RAT Windows trojan marketed as fully undetectable.
Screenshot: Group-IB, blog splash graphic for KGB RAT: A Fully Undetectable Windows Trojan Built to Spy, Steal, and Terrorize, Oct 14, 2026 (fair use).

Detection

Group-IB Says KGB RAT Sells Fully Undetectable Windows Control With HVNC, Credential Theft and Harassment Features

Group-IB researchers say the NjRAT-based MaaS trojan markets itself as admin software, ships a daily-updated FUD crypter and Telegram alerts, and still shows a huntable ChromeUpdate scheduled task and svchost drop in Temp once detonated.

Ava Okello, DetectionLondon6 min read

LONDON - Group-IB researchers said on Oct. 14, 2026 that KGB RAT, a Windows remote-access trojan sold as malware-as-a-service and marketed as legitimate administration software, combines credential theft, keylogging, hidden VNC, ransomware, and a set of psychological harassment modules behind a builder that claims daily Fully UnDetectable crypter updates. The analysts, Alpomish Asadov and Razvan Raducu, say static analysis ties the family to NjRAT 0.7D Lime Edition, also known as Bladabindi, and that most samples are x86 .NET VB.NET executables. Underground promotion dates to at least late 2025, while Group-IB found earlier server infrastructure labeled v0.1 from late January 2022. For SOC and EDR teams, the report's value is behavioral: the crypter may dodge signatures, but runtime still leaves ChromeUpdate scheduled tasks, a Temp-dropped svchost.exe, Telegram and ip-api.com egress, and config fields Group-IB's Malware Detonation Platform extracts even from obfuscated and encrypted-dropper builds.

The public site advertises complete Windows control, military-grade encryption, 100 percent FUD technology, Telegram alerts, and no port-forwarding requirement. Paid plans start at $150 for one month and reach $800 for a year, with a separate $500 Network Spreading add-on for claimed LAN lateral movement. The feature list includes remote desktop and Hidden VNC, webcam and microphone capture, file management, password recovery from browsers and the system, registry and process control, UAC bypass and persistence, multi-format payload builders (EXE, BAT, REG, HTA), a binder, and a Unique Stub Generator. Developers label screamers, jump scares, and forced blue screens as "fun settings." Group-IB says at least one analyzed sample enabled a CryptoClipper that swaps BTC, ETH, and TRC-20 clipboard addresses, and that configuration clusters point to multiple operators sharing one builder rather than a single campaign.

Group-IB Malware Detonation Platform view showing extracted KGB RAT configuration fields including C2 host, Telegram flags, and ChromeUpdate task name.
Screenshot: Group-IB, Figure 7, Examples of extracted configs from a KGB RAT sample, Oct 14, 2026 (fair use).Detonation extracts a ChromeUpdate task name and a C2 host from the config.
KGB RAT builder UI showing Fun settings for harassment modules under the Extra menu.
Screenshot: Group-IB, Figure 2, Fun settings nested under Extra menu option in the KGB RAT builder, Oct 14, 2026 (fair use).The builder nests harassment modules under an Extra menu labeled as fun settings.

On the host, Group-IB's detonation tree shows the original sample installing and relaunching as svchost.exe under AppData\Local\Temp, then creating a scheduled task named ChromeUpdate with ONLOGON and /rl HIGHEST, hiding super-hidden files through ShowSuperHidden, and refreshing Explorer through PowerShell. Runtime also includes WMI queries for AntiVirusProduct, Win32_OperatingSystem, motherboard identifiers, and running processes; GetAsyncKeyState polling for keylogging; Windows Credential Manager vault access; and C2 beacons that carry hostname, username, OS build, and installed AV behind a |Ghost| delimiter. Network indicators in the report include primary C2 104[.]248[.]130[.]195 on ports 7489, 7490, and 7492, secondary C2 2[.]59[.]134[.]215 on port 443, geolocation lookups to ip-api[.]com/json/, Telegram Bot API sendMessage calls, and the marketing domain kgbrat[.]org.

Group-IB threat intelligence portal card summarizing KGB RAT as a Windows remote access trojan.
Screenshot: Group-IB, Threat Intelligence Portal malware profile card for KGB RAT, Oct 14, 2026 (fair use).Group-IB's portal card lists KGB RAT as a Windows remote-access trojan first seen in February 2022.

Group-IB stresses that shared code and infrastructure connect samples without proving one operator, and that comparing configs, enabled modules, and runtime behavior is required to separate deployments. Defensive recommendations in the write-up track the same artifacts SOCs can hunt today: alert on schtasks /create from AppData\Local\Temp with ONLOGON and HIGHEST run level, block or flag non-browser egress to api.telegram[.]org and ip-api[.]com, monitor Temp svchost.exe drops and ChromeUpdate tasks, and prefer behavioral detonation over signature-only gates against a daily-updating crypter. The firm published SHA-256 hashes, host paths such as %TEMP%\obito.txt and scream.wav, and registry paths used for ms-settings UAC bypass and Policies\Explorer\Run persistence. Commodity packaging does not make the family exotic, Group-IB concludes; it makes familiar NjRAT capabilities available to buyers who never have to maintain the code themselves.

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Ava Okello covers detection engineering and SOC operations for SOCtember from London.

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