Threat Database Trojans Trojan.Agent.LKGG

Trojan.Agent.LKGG

By CagedTech in Trojans

Threat Scorecard

Popularity Rank: 27,337
Threat Level: 80 % (High)
Infected Computers: 1
First Seen: June 13, 2026
Last Seen: June 23, 2026
OS(es) Affected: Windows

Security researchers have issued advisories regarding a stealthy threat detected as Trojan.Agent.LKGG. Classified as a generic Trojan detection, this threat represents a significant risk to system integrity and user privacy. Like many threats in this category, it is designed to infiltrate Windows systems silently, establish a persistent foothold, and facilitate unauthorized activities. Because it often masks its presence behind seemingly legitimate processes, users may remain unaware of the infection for extended periods. This removal report outlines the fundamental characteristics of Trojan.Agent.LKGG, its general behavior, and the recommended steps for complete eradication.

What Is Trojan.Agent.LKGG?

Trojan.Agent.LKGG is a detection name used to identify a malicious Windows PE executable. Threats of this nature are typically designed to act as a backdoor or a delivery mechanism for additional malicious payloads. Analysis of the file structure reveals that the executable carries a self-signed signature. While a legitimate digital signature is generally used to verify the publisher and ensure the file has not been tampered with, a self-signed status indicates that the certificate was generated by the developer rather than a trusted certificate authority. This is a common evasion tactic used to make the file appear more legitimate to the operating system and bypass basic security warnings, while still avoiding standard identity verification protocols.

How Trojan.Agent.LKGG Operates

Once executed on a target system, Trojan.Agent.LKGG generally follows the behavioral patterns of a standard Windows Trojan. Upon execution, the PE file may attempt to write its components to hidden or system directories to avoid detection by the casual user. It often modifies system configurations to establish persistence, ensuring that it is launched automatically every time the operating system starts. By utilizing its self-signed status, the threat attempts to blend into normal system operations. Once established, it may attempt to communicate with remote servers to receive commands, download additional malicious modules, or transmit sensitive information gathered from the compromised host.

Symptoms of Infection

Because Trojan.Agent.LKGG is designed to operate quietly, there are rarely obvious visual symptoms. However, users may observe several indirect signs of compromise:

  • Unexpected degradation in system performance or frequent system freezes.
  • Unexplained network activity, particularly when the computer is idle.
  • Disabled or modified security software, including firewalls and antivirus programs.
  • The sudden appearance of unfamiliar processes running in the Windows Task Manager.
  • System crashes or instability caused by the Trojan interfering with critical system processes.

How to Remove Trojan.Agent.LKGG

Removing Trojan.Agent.LKGG requires a systematic approach to ensure that all malicious components and registry modifications are completely eliminated. Follow these steps to restore your system:

  1. Boot your computer into Safe Mode with Networking to prevent the Trojan from loading automatically and to limit its ability to interfere with the removal process.
  2. Run a full system scan with a reputable anti-malware tool such as SpyHunter to detect and quarantine the malicious PE executable and any associated files.
  3. Uninstall suspicious or unrecognized programs from the Windows Control Panel that may have been installed alongside the threat.
  4. Reset your web browsers (Chrome, Firefox, and Edge) to default settings to remove any malicious extensions, altered proxy settings, or unauthorized homepage modifications.
  5. Reboot your computer normally and perform a final re-scan with your anti-malware software to confirm that Trojan.Agent.LKGG has been completely removed.

Conclusion

Trojan.Agent.LKGG is a serious threat that leverages a self-signed Windows PE executable to infiltrate systems and maintain persistence. Its ability to operate silently makes it a danger to both personal and professional computing environments. Prompt detection and thorough removal are essential to prevent data loss and further system compromise. By utilizing a robust anti-malware solution and following the recommended removal protocol, users can effectively neutralize the threat and restore their system to a secure state.

Analysis Report

General information

Family Name: Trojan.Agent.LKGG
Signature status: Self Signed

Known Samples

MD5: cfb338926bea158ee4fcec4ee691d001
SHA1: 1714e61eb03ebe5299f08dcdeeb6317238dd2a9e
SHA256: B3780535DBE32D92A86EA5E4B572C75E4CFA4EA898A347F8888B00255C5DF1D9
File Size: 131.07 KB, 131072 bytes

Windows Portable Executable Attributes

  • File doesn't have "Rich" header
  • File doesn't have debug information
  • File has exports table
  • File has TLS information
  • File is 64-bit executable
  • File is either console or GUI application
  • File is GUI application (IMAGE_SUBSYSTEM_WINDOWS_GUI)
  • File is Native application (NOT .NET application)
  • File is not packed
  • IMAGE_FILE_DLL is not set inside PE header (Executable)
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  • IMAGE_FILE_EXECUTABLE_IMAGE is set inside PE header (Executable Image)

Windows PE Version Information

Name Value
Company Name Riverstone Gate Digital GmbH
File Description Shows and manages color thumbnail maker on the desktop
File Version 12.13.932.171
Legal Copyright (c) 2026 Riverstone Gate Digital GmbH. All rights reserved.
Original Filename ColorThumbnailMaker.exe
Product Name Color Thumbnail Maker
Special Build Stable

Digital Signatures

Signer Root Status
Color Thumbnail Maker Color Thumbnail Maker Self Signed
Color Thumbnail Maker Color Thumbnail Maker Self Signed

File Traits

  • dll
  • HighEntropy
  • x64

Block Information

Total Blocks: 61
Potentially Malicious Blocks: 14
Whitelisted Blocks: 47
Unknown Blocks: 0

Visual Map

0 0 0 0 0 0 0 x x 0 0 x x x x 0 0 0 x x 0 x 0 0 x x x x 0 0 x 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 - Probable Safe Block
? - Unknown Block
x - Potentially Malicious Block

Similar Families

  • Agent.LKGH
  • Dropper.NFA

Windows API Usage

Category API
Syscall Use
  • ntdll.dll!NtAccessCheck
  • ntdll.dll!NtAlpcSendWaitReceivePort
  • ntdll.dll!NtApphelpCacheControl
  • ntdll.dll!NtClose
  • ntdll.dll!NtConnectPort
  • ntdll.dll!NtCreateMutant
  • ntdll.dll!NtCreateSection
  • ntdll.dll!NtDuplicateToken
  • ntdll.dll!NtFreeVirtualMemory
  • ntdll.dll!NtMapViewOfSection
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  • ntdll.dll!NtOpenFile
  • ntdll.dll!NtOpenKey
  • ntdll.dll!NtOpenKeyEx
  • ntdll.dll!NtOpenProcessToken
  • ntdll.dll!NtOpenProcessTokenEx
  • ntdll.dll!NtOpenSection
  • ntdll.dll!NtOpenSemaphore
  • ntdll.dll!NtOpenThreadTokenEx
  • ntdll.dll!NtProtectVirtualMemory
  • ntdll.dll!NtQueryAttributesFile
  • ntdll.dll!NtQueryDebugFilterState
  • ntdll.dll!NtQueryInformationProcess
  • ntdll.dll!NtQueryInformationThread
  • ntdll.dll!NtQueryInformationToken
  • ntdll.dll!NtQueryKey
  • ntdll.dll!NtQueryPerformanceCounter
  • ntdll.dll!NtQuerySecurityAttributesToken
  • ntdll.dll!NtQueryValueKey
  • ntdll.dll!NtQueryVirtualMemory
  • ntdll.dll!NtQueryVolumeInformationFile
  • ntdll.dll!NtQueryWnfStateData
  • ntdll.dll!NtReleaseMutant
  • ntdll.dll!NtReleaseSemaphore
  • ntdll.dll!NtReleaseWorkerFactoryWorker
  • ntdll.dll!NtRequestWaitReplyPort
  • ntdll.dll!NtSetEvent
  • ntdll.dll!NtSetInformationProcess
  • ntdll.dll!NtSetInformationVirtualMemory
  • ntdll.dll!NtSetInformationWorkerFactory
  • ntdll.dll!NtSubscribeWnfStateChange
  • ntdll.dll!NtTestAlert
  • ntdll.dll!NtTraceControl
  • ntdll.dll!NtUnmapViewOfSection
  • ntdll.dll!NtUnmapViewOfSectionEx
  • ntdll.dll!NtWaitForSingleObject
  • ntdll.dll!NtWaitLowEventPair
  • ntdll.dll!NtWriteFile
  • UNKNOWN

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