Threat Database Trojans Trojan.Agent.HJD

Trojan.Agent.HJD

By CagedTech in Trojans
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Trojan.Agent.HJD is a detection name used to identify a trojan horse—a type of malicious software that disguises itself as something legitimate in order to infiltrate a computer and carry out harmful activities without the user's knowledge. Like other threats in the broad "Agent" detection family, Trojan.Agent.HJD is typically used by security tools to flag suspicious files that exhibit trojan-like behavior, even when the exact origin, author, or full capabilities of the specific sample are not always fully documented. Because detailed technical specifics about this particular variant are not publicly confirmed, the information below describes the typical behavior associated with threats in this category.

What This Threat Does

Trojans such as Trojan.Agent.HJD are generally designed to run quietly in the background while performing actions that benefit cybercriminals rather than the computer's owner. Depending on the specific build, this can include collecting information from the infected system, modifying system settings, downloading and installing additional malicious components, or granting remote attackers unauthorized access to the machine. Many trojans in this category are also capable of disabling or interfering with security software, making it harder for victims to detect and remove the infection.

How It Usually Gets Onto Computers

Trojans like this one typically spread through deceptive methods rather than self-replication. Common infection vectors include malicious email attachments, fake software updates, cracked or pirated software, bundled downloads from untrustworthy websites, malicious advertisements, and links shared through social engineering tactics. Once a user is tricked into opening or executing the infected file, the trojan installs itself and may begin its malicious routine immediately or wait for specific triggers before activating.

Risks for the User

Infections of this type can expose users to a range of serious risks. These may include theft of sensitive information such as login credentials, financial data, or personal files; degraded system performance due to background malicious processes; installation of additional malware, including ransomware, spyware, or adware; and unauthorized remote control of the infected device. In some cases, trojans serve as a foothold for larger attacks, allowing cybercriminals to pivot further into a home or business network.

Signs of Infection

Because trojans are built to operate stealthily, they do not always produce obvious symptoms. However, users may notice warning signs such as unexpected slowdowns, unusual network activity, unfamiliar processes running in the background, changes to browser or system settings that were not made by the user, security software being disabled unexpectedly, or new unfamiliar programs appearing on the system. Frequent crashes or unusual pop-ups can also indicate the presence of malware.

How to Stay Protected

To reduce the risk of encountering threats like Trojan.Agent.HJD, users should avoid downloading software from unofficial or unverified sources, be cautious with email attachments and links from unknown senders, and keep their operating system and applications updated with the latest security patches. Running reputable security software and keeping it updated is strongly recommended, as is performing regular system scans. Creating regular backups of important files can also help minimize damage if an infection does occur. Practicing cautious browsing habits and avoiding pirated software remain among the most effective ways to prevent trojan infections in general.

Analysis Report

General information

Family Name: Trojan.Agent.HJD
Signature status: No Signature

Known Samples

MD5: baf568fd77cf967038981d415ebad8c9
SHA1: ae368d7ea0b7560ebf96848335775844dc3b28f2
SHA256: 77D5C649550BCC758E7A394DD348371AA0E64703AA74F6254D7BC00AA9963A1C
File Size: 566.27 KB, 566272 bytes

Windows Portable Executable Attributes

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

File Traits

  • dll
  • ntdll
  • WriteProcessMemory
  • x64

Block Information

Total Blocks: 3,679
Potentially Malicious Blocks: 4
Whitelisted Blocks: 3,652
Unknown Blocks: 23

Visual Map

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... Data truncated
0 - Probable Safe Block
? - Unknown Block
x - Potentially Malicious Block

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Windows API Usage

Category API
Syscall Use
  • ntdll.dll!NtAlpcSendWaitReceivePort
  • ntdll.dll!NtClose
  • ntdll.dll!NtCreateSection
  • ntdll.dll!NtFreeVirtualMemory
  • ntdll.dll!NtMapViewOfSection
  • ntdll.dll!NtOpenFile
  • ntdll.dll!NtOpenKey
  • ntdll.dll!NtOpenProcessToken
  • ntdll.dll!NtProtectVirtualMemory
  • ntdll.dll!NtQueryAttributesFile
Show More
  • ntdll.dll!NtQueryDebugFilterState
  • ntdll.dll!NtQueryInformationProcess
  • ntdll.dll!NtQueryInformationToken
  • ntdll.dll!NtQueryPerformanceCounter
  • ntdll.dll!NtQueryValueKey
  • ntdll.dll!NtQueryVirtualMemory
  • ntdll.dll!NtQueryVolumeInformationFile
  • ntdll.dll!NtReleaseWorkerFactoryWorker
  • ntdll.dll!NtSetEvent
  • ntdll.dll!NtSetInformationProcess
  • ntdll.dll!NtSetInformationVirtualMemory
  • ntdll.dll!NtSetInformationWorkerFactory
  • ntdll.dll!NtTestAlert
  • ntdll.dll!NtTraceControl
  • ntdll.dll!NtUnmapViewOfSection
  • ntdll.dll!NtWaitForWorkViaWorkerFactory
  • ntdll.dll!NtWriteFile