Threat Database Trojans Trojan.Injector.EA

Trojan.Injector.EA

By CagedTech in Trojans
Published:
Last updated:

Threat Scorecard

Popularity Rank: 20,698
Threat Level: 80 % (High)
Infected Computers: 6
First Seen: January 24, 2013
Last Seen: September 15, 2026
OS(es) Affected: Windows

Trojan.Injector.EA is a dangerous Trojan horse infection that targets Windows computers. Classified as a high-risk threat, it is designed to sneak onto a system unnoticed and then carry out harmful actions in the background without the user's knowledge or consent. Because it does not spread on its own, each infection is typically the result of a user unknowingly installing or triggering the malicious file.

What Trojan.Injector.EA Does

Once active on a system, Trojan.Injector.EA installs itself secretly and operates quietly in the background, avoiding obvious signs of its presence. Its core behavior revolves around code injection: the Trojan uses techniques such as unmapping sections of legitimate processes and writing data directly into process memory. This allows it to insert its own malicious code into otherwise trustworthy running programs, making detection and removal more difficult and helping it evade basic security checks.

The Trojan also makes use of system-level calls that can manipulate files, memory, and system events, as well as functions associated with checking system information, a technique often used to detect whether the malware is being analyzed or run in a monitored environment. It has been observed launching processes through legitimate Windows system tools, which can make its activity blend in with normal system operations. Most seriously, Trojan.Injector.EA can allow attackers to gain extensive control over the infected computer, potentially letting cybercriminals carry out further malicious actions on the system.

How It Usually Gets Onto Computers

Trojan.Injector.EA commonly spreads by exploiting system vulnerabilities and security flaws that have not been patched. It is also frequently delivered through software downloaded from malicious or compromised websites, as well as through email attachments sent from untrusted or unknown senders. These attachments can be disguised with various file extensions, including executable files and files that appear to be images or videos, tricking users into opening them.

Risks for the User

An infection with Trojan.Injector.EA poses serious risks. Because the malware can inject itself into legitimate processes and potentially grant attackers remote control over the system, infected users may face stolen data, unauthorized monitoring, installation of additional malware, or further compromise of personal and system information. The Trojan's stealthy design means it can remain active for extended periods without detection, increasing the potential damage.

Signs of Infection

Since Trojans like Injector.EA are built to operate quietly, visible symptoms may be subtle or absent. Users should watch for unusual system behavior such as unexpected slowdowns, unfamiliar processes running in the background, unexplained network activity, or security tools being unexpectedly blocked or disabled. Any unexpected activity involving legitimate system tools or unfamiliar files appearing in download folders may also warrant closer investigation.

How to Stay Protected

To reduce the risk of infection, keep the Windows operating system and all installed software fully updated to close known security vulnerabilities. Avoid downloading software from untrusted or unofficial websites, and never open email attachments from unknown or suspicious senders, regardless of the file extension shown. Maintaining regular backups of important data and using reputable, up-to-date security software can further help detect and block threats like Trojan.Injector.EA before they cause harm.

Analysis Report

General information

Family Name: Trojan.Injector.EA
Signature status: No Signature

Known Samples

MD5: ccb8f160d903d2f1ce6b9312a0561dc9
SHA1: 9a9ac34bca5ff572e805d293e7bb8fc895eb3b85
SHA256: 7B24E6A82AD6F43AB0129824226E1B0796BC96E0F32BE4CA6DC50F9A3B4A5D17
File Size: 23.55 KB, 23552 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 has TLS information
  • File is 32-bit executable
  • File is console application (IMAGE_SUBSYSTEM_WINDOWS_CUI)
  • File is either console or GUI application
  • File is Native application (NOT .NET application)
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  • File is not packed
  • IMAGE_FILE_DLL is not set inside PE header (Executable)
  • IMAGE_FILE_EXECUTABLE_IMAGE is set inside PE header (Executable Image)

File Traits

  • dll
  • WriteProcessMemory
  • x86

Block Information

Total Blocks: 139
Potentially Malicious Blocks: 45
Whitelisted Blocks: 93
Unknown Blocks: 1

Visual Map

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

Similar Families

  • Injector.EA

Windows API Usage

Category API
Syscall Use
  • ntdll.dll!NtAlpcSendWaitReceivePort
  • ntdll.dll!NtClose
  • ntdll.dll!NtCreateFile
  • ntdll.dll!NtCreateSection
  • ntdll.dll!NtFreeVirtualMemory
  • ntdll.dll!NtMapViewOfSection
  • ntdll.dll!NtOpenFile
  • ntdll.dll!NtOpenKey
  • ntdll.dll!NtOpenProcessToken
  • ntdll.dll!NtQueryAttributesFile
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  • ntdll.dll!NtQueryDebugFilterState
  • ntdll.dll!NtQueryInformationProcess
  • ntdll.dll!NtQueryInformationToken
  • ntdll.dll!NtQuerySystemInformationEx
  • ntdll.dll!NtQueryValueKey
  • ntdll.dll!NtQueryVirtualMemory
  • ntdll.dll!NtQueryVolumeInformationFile
  • ntdll.dll!NtReadFile
  • ntdll.dll!NtSetEvent
  • ntdll.dll!NtSetInformationFile
  • ntdll.dll!NtSetInformationProcess
  • ntdll.dll!NtSetInformationVirtualMemory
  • ntdll.dll!NtSetInformationWorkerFactory
  • ntdll.dll!NtTestAlert
  • ntdll.dll!NtTraceControl
  • ntdll.dll!NtUnmapViewOfSection
  • ntdll.dll!NtWaitForSingleObject
  • ntdll.dll!NtWriteFile
Process Manipulation Evasion
  • NtUnmapViewOfSection
Process Shell Execute
  • CreateProcess
Anti Debug
  • NtQuerySystemInformation

Shell Command Execution

C:\WINDOWS\SysWOW64\rundll32.exe C:\WINDOWS\system32\rundll32.exe c:\users\user\downloads\9a9ac34bca5ff572e805d293e7bb8fc895eb3b85_0000023552.,LiQMAxHB