What is “MSIL/Agent.EF”?

The MSIL/Agent.EF is considered dangerous by lots of security experts. When this infection is active, you may notice unwanted processes in Task Manager list. In this case, it is adviced to scan your computer with GridinSoft Anti-Malware.

What MSIL/Agent.EF virus can do?

• SetUnhandledExceptionFilter detected (possible anti-debug)
• At least one process apparently crashed during execution
• Yara rule detections observed from a process memory dump/dropped files/CAPE
• Creates RWX memory
• Guard pages use detected – possible anti-debugging.
• Dynamic (imported) function loading detected
• Enumerates the modules from a process (may be used to locate base addresses in process injection)
• CAPE extracted potentially suspicious content
• Drops a binary and executes it
• Unconventionial language used in binary resources: Arabic (Qatar)
• Authenticode signature is invalid
• Uses Windows utilities for basic functionality
• Behavioural detection: Injection (inter-process)
• Behavioural detection: Injection with CreateRemoteThread in a remote process
• Installs itself for autorun at Windows startup
• Creates a copy of itself
• Attempts to modify Explorer settings to prevent hidden files from being displayed

How to determine MSIL/Agent.EF?

File Info:
name: B50AA8E89E5703F58070.mlwpath: /opt/CAPEv2/storage/binaries/958ea21777db57d89704f9d9510a970b656fade992f38cfa2cfebbdf07494100crc32: 3E73EAD5md5: b50aa8e89e5703f5807009e266306467sha1: 3e74d7bd1ebc7e29a98289c9b68cc6bd13ec7ef3sha256: 958ea21777db57d89704f9d9510a970b656fade992f38cfa2cfebbdf07494100sha512: 337b92122b185a829b339e3908693c851a95a393086b1c061b3611aa2a1a519f2efbc131469d73f7daac3438606d6b205a9e621306570a51a1dbcbd8ba961a83ssdeep: 1536:CPQc0IiI+7vAIIzuQ8Tr15WUkTdIOzq0ZD1nJvx/rITxr:sQc01zAf6QGkBIO20ZzvEtype: PE32 executable (GUI) Intel 80386, for MS Windowstlsh: T15E937D1577CC4FAAC6EE07B890B3436547B1E862A507D70F6DD864FA2D633808A427B7sha3_384: 52427ba4a1c2405a9b1c020a9260d6c327cf5fef9f8bd46aaff253a3011feef01cf3dc3c063c849e6e1f7cc9bfecda74ep_bytes: ff250020400000000000000000000000timestamp: 2012-06-02 12:12:48
Version Info:
CompanyName: Microsoft CorporationFileDescription: Microsoft Security Client Policy Configuration ToolFileVersion: 4.18.18362.1 (WinBuild.160101.0800)InternalName: ConfigSecurityPolicy.exeLegalCopyright: © Microsoft Corporation. All rights reserved.OriginalFilename: ConfigSecurityPolicy.exeProductName: Microsoft® Windows® Operating SystemProductVersion: 4.18.18362.1Translation: 0x0409 0x04b0

MSIL/Agent.EF also known as:

How to remove MSIL/Agent.EF?

• Download and install GridinSoft Anti-Malware.
• Open GridinSoft Anti-Malware and perform a “Standard scan“.
• “Move to quarantine” all items.
• Open “Tools” tab – Press “Reset Browser Settings“.
• Select proper browser and options – Click “Reset”.
• Restart your computer.