Threat Database Backdoors Backdoor.MSIL.Agent.OAHI

Backdoor.MSIL.Agent.OAHI

By CagedTech in Backdoors

Threat Scorecard

Popularity Rank: 17,502
Threat Level: 60 % (Medium)
Infected Computers: 3
First Seen: April 26, 2026
Last Seen: June 3, 2026
OS(es) Affected: Windows

The detection of Backdoor.MSIL.Agent.OAHI on your system indicates a potential security threat that requires immediate attention. This backdoor threat can compromise the security and integrity of your computer, allowing unauthorized access and potentially leading to further malicious activities. It is essential to understand the nature of this threat and take prompt action to remove it and prevent future infections.

What Is Backdoor.MSIL.Agent.OAHI?

Backdoor.MSIL.Agent.OAHI is a type of malware that functions as a backdoor, which means it is designed to bypass security mechanisms and allow unauthorized access to a compromised computer. The name suggests it is written in MSIL (Microsoft Intermediate Language), which is a platform-agnostic intermediate representation of the .NET Framework. This type of malware can be particularly dangerous because it can be used to download and install additional malicious software, steal sensitive information, or provide remote access to the attacker.

How Backdoor.MSIL.Agent.OAHI Operates

Backdoor.MSIL.Agent.OAHI, like other backdoor malware, operates by creating a covert communication channel between the compromised computer and the command and control server controlled by the attacker. This allows the attacker to issue commands, upload files, and download data from the infected computer without the user's knowledge or consent. The specific mechanisms and protocols used by Backdoor.MSIL.Agent.OAHI for communication and data transfer are not detailed here, but the general behavior of backdoor malware involves exploiting vulnerabilities or using social engineering tactics to gain initial access to a system.

Symptoms of Infection

Symptoms of a Backdoor.MSIL.Agent.OAHI infection can be subtle and may not always be immediately apparent. However, common indicators of a backdoor infection include unusual network activity, slow system performance, unexpected changes to system settings, and the appearance of unfamiliar programs or files. Users may also notice that their antivirus software is disabled or that security updates are being blocked. In some cases, there may be no noticeable symptoms at all, which is why regular system scans and monitoring are crucial for detecting and removing malware.

How to Remove Backdoor.MSIL.Agent.OAHI

  1. Boot your computer in Safe Mode with Networking to prevent the malware from loading and to allow for a clean environment to perform removal steps.
  2. Use a reputable anti-malware tool, such as SpyHunter, to perform a full scan of your system. Ensure the tool is updated with the latest definitions to increase the chances of detecting and removing the malware.
  3. Uninstall any suspicious programs or applications that you do not recognize or that were installed around the time the malware was detected.
  4. Reset your web browsers (Chrome, Firefox, Edge, etc.) to their default settings to remove any malicious extensions or settings that the malware may have altered.
  5. Reboot your computer and perform another full scan with your anti-malware tool to ensure that the malware has been completely removed. Repeat this process if the malware is still detected after the first removal attempt.

Conclusion

Removing Backdoor.MSIL.Agent.OAHI requires careful and systematic steps to ensure that all components of the malware are eliminated from the infected system. It is crucial to act quickly to prevent further damage and potential data theft. After removal, it is recommended to change all passwords, especially for sensitive accounts, and to monitor your system and accounts for any signs of unauthorized access. Preventing future infections involves keeping your operating system and software up to date, using reputable antivirus software, and practicing safe computing habits, such as avoiding suspicious downloads and emails.

Analysis Report

General information

Family Name: Backdoor.MSIL.Agent.OAHI
Signature status: No Signature

Known Samples

MD5: f141c9968883eab54ef72b74b0add2a0
SHA1: bc1476aab071147d2a171b17ef2767e6e4300c12
SHA256: 0591B721F1C569CB8E04CD2F0C18AC8E833D91141754B1C332CF12CF41CC1E02
File Size: 689.15 KB, 689152 bytes

Windows Portable Executable Attributes

  • File doesn't have "Rich" header
  • File doesn't have debug information
  • File doesn't have exports table
  • File doesn't have security information
  • File is .NET application
  • File is 32-bit executable
  • File is either console or GUI application
  • File is GUI application (IMAGE_SUBSYSTEM_WINDOWS_GUI)
  • File is not packed
  • IMAGE_FILE_DLL is not set inside PE header (Executable)
Show More
  • IMAGE_FILE_EXECUTABLE_IMAGE is set inside PE header (Executable Image)

Windows PE Version Information

Name Value
Assembly Version 1.0.0.0
File Description SteamSetup
File Version 1.0.0.0
Internal Name SteamSetup.exe
Legal Copyright Copyright © 2026
Original Filename SteamSetup.exe
Product Name SteamSetup
Product Version 1.0.0.0

File Traits

  • .NET
  • GenKrypt
  • HighEntropy
  • Installer Version
  • Reactor
  • Reflective
  • RijndaelManaged
  • x86

Block Information

Total Blocks: 64
Potentially Malicious Blocks: 1
Whitelisted Blocks: 55
Unknown Blocks: 8

Visual Map

0 ? ? 0 0 0 0 0 0 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 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

  • MSIL.Agent.OAAL
  • MSIL.Agent.OAHI
  • MSIL.Krypt.EDCPB
  • MSIL.Krypt.EDCPD
  • MSIL.Tedy.F
Show More
  • MSIL.Tedy.JA

Windows API Usage

Category API
User Data Access
  • GetUserDefaultLocaleName
  • GetUserObjectInformation
Other Suspicious
  • AdjustTokenPrivileges
Encryption Used
  • BCryptOpenAlgorithmProvider

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