About “Worm:Win32/Yuner.A” infection

The Worm:Win32/Yuner.A 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 Worm:Win32/Yuner.A virus can do?

• A file was accessed within the Public folder.
• Sample contains Overlay data
• Reads data out of its own binary image
• Drops a binary and executes it
• The binary contains an unknown PE section name indicative of packing
• The binary likely contains encrypted or compressed data.
• The executable is compressed using UPX
• Creates an autorun.inf file
• Authenticode signature is invalid
• Attempts to identify installed AV products by registry key
• Detects the presence of Windows Defender AV emulator via files
• Attempts to disable System Restore
• Attempts to disable Windows File Protection aka System File Checker.
• Touches a file containing cookies, possibly for information gathering
• Attempts to modify or disable Security Center warnings
• Attempts to modify Explorer settings to prevent file extensions from being displayed
• Attempts to modify Explorer settings to prevent hidden files from being displayed
• Yara detections observed in process dumps, payloads or dropped files

How to determine Worm:Win32/Yuner.A?

File Info:
name: 4EBB20ACFF1B18349125.mlwpath: /opt/CAPEv2/storage/binaries/886d091eaaa28facc2ac92762d01e14d215bb0f1952126d58e2208cab1a09098crc32: DF2C9D5Fmd5: 4ebb20acff1b183491252fb72e7fccc3sha1: c134b783cace2ab55995a958711edadc331fe90bsha256: 886d091eaaa28facc2ac92762d01e14d215bb0f1952126d58e2208cab1a09098sha512: a8efe5af63239ce338fe17362789e1ed8322b446d6d5ad76b6020c115fd24b401ac0409a9de7506703b92a1513ecf8fd445ffb299e00ba79f159af26dbf6ed7cssdeep: 3072:MMDb50WrZa8jCgae5+VQkGdUQFDxePZ2SBaQJXkNRtXlNGKaUIQW/qlQBG3mmTJ3:1xlZam+akqx6YQJXcNlEHUIQeE3mmBIWtype: PE32 executable (GUI) Intel 80386, for MS Windowstlsh: T1C14413C2A6D95AE6ECC619771A23DFC41F55FE3169C60A10BA04B16F49F73C1AA13323sha3_384: dba61966e04cf434bf4b9564dd53b243266ad0767f788292a15a9d755d3bd9df28de08172899fae402067d2bae84f3bfep_bytes: 60be002046008dbe00f0f9ff57eb0b90timestamp: 2007-09-10 14:57:50
Version Info:
FileDescription: Virus.Name.: ., ., ., .Nuyer.........: ...... .. ...... : ., ., ., .Translation: 0x0809 0x04b0

Worm:Win32/Yuner.A also known as:

How to remove Worm:Win32/Yuner.A?

• 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.