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.

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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.mlw
path: /opt/CAPEv2/storage/binaries/958ea21777db57d89704f9d9510a970b656fade992f38cfa2cfebbdf07494100
crc32: 3E73EAD5
md5: b50aa8e89e5703f5807009e266306467
sha1: 3e74d7bd1ebc7e29a98289c9b68cc6bd13ec7ef3
sha256: 958ea21777db57d89704f9d9510a970b656fade992f38cfa2cfebbdf07494100
sha512: 337b92122b185a829b339e3908693c851a95a393086b1c061b3611aa2a1a519f2efbc131469d73f7daac3438606d6b205a9e621306570a51a1dbcbd8ba961a83
ssdeep: 1536:CPQc0IiI+7vAIIzuQ8Tr15WUkTdIOzq0ZD1nJvx/rITxr:sQc01zAf6QGkBIO20ZzvE
type: PE32 executable (GUI) Intel 80386, for MS Windows
tlsh: T15E937D1577CC4FAAC6EE07B890B3436547B1E862A507D70F6DD864FA2D633808A427B7
sha3_384: 52427ba4a1c2405a9b1c020a9260d6c327cf5fef9f8bd46aaff253a3011feef01cf3dc3c063c849e6e1f7cc9bfecda74
ep_bytes: ff250020400000000000000000000000
timestamp: 2012-06-02 12:12:48

Version Info:
CompanyName: Microsoft Corporation
FileDescription: Microsoft Security Client Policy Configuration Tool
FileVersion: 4.18.18362.1 (WinBuild.160101.0800)
InternalName: ConfigSecurityPolicy.exe
LegalCopyright: © Microsoft Corporation. All rights reserved.
OriginalFilename: ConfigSecurityPolicy.exe
ProductName: Microsoft® Windows® Operating System
ProductVersion: 4.18.18362.1
Translation: 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.