Sirefef.646 removal

The Sirefef.646 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 Sirefef.646 virus can do?

• Behavioural detection: Executable code extraction – unpacking
• SetUnhandledExceptionFilter detected (possible anti-debug)
• Yara rule detections observed from a process memory dump/dropped files/CAPE
• Creates RWX memory
• Anomalous file deletion behavior detected (10+)
• A process attempted to delay the analysis task.
• Dynamic (imported) function loading detected
• Enumerates running processes
• Expresses interest in specific running processes
• Reads data out of its own binary image
• CAPE extracted potentially suspicious content
• Drops a binary and executes it
• Unconventionial language used in binary resources: Russian
• Authenticode signature is invalid
• Code injection with CreateRemoteThread in a remote process
• Behavioural detection: Injection (inter-process)
• Behavioural detection: Injection with CreateRemoteThread in a remote process
• Collects and encrypts information about the computer likely to send to C2 server
• Installs itself for autorun at Windows startup
• Performs a large number of encryption calls using the same key possibly indicative of ransomware file encryption behavior
• Creates a copy of itself
• Harvests cookies for information gathering
• Attempts to modify or disable Security Center warnings

How to determine Sirefef.646?

File Info:
name: 57FC1287722E80CB2904.mlwpath: /opt/CAPEv2/storage/binaries/b400a59096d3ccad3833a6d6c9ad18706cba48c62328feafc8405e2fec27f8b3crc32: 6574DD87md5: 57fc1287722e80cb2904235779d54c2bsha1: a6c1d0867cd97a12f0fde75702447cdcf07d525asha256: b400a59096d3ccad3833a6d6c9ad18706cba48c62328feafc8405e2fec27f8b3sha512: 707d3d9eb8b5f4f47d1955a502c97ad338daad284ece4787cd746f9485fe89cd7d9297708fb854c857c02125a51a7875d6fa3211f51777265ca8576e6b0580e2ssdeep: 3072:g0KYeYT2rDD3Ohc6uXhmKWC+W/QPuj7a/5A4snRAjFXTLPUQkBKDEem:g0/UD66MzApRqXTLPUQkBKDtype: PE32 executable (GUI) Intel 80386, for MS Windowstlsh: T19234E126EFC190BBC1E54772DFEB1768BE39B18841150F1E8B4D412C2EE2799E61EB50sha3_384: d150eab606cc81ba65c7b55683fd185792db8367927c4582035145ca37d9d55e6e8edfad0245f235b6dc38dac40d6363ep_bytes: 8d00558bec83c4acf7d303f0e8fe0400timestamp: 2004-12-06 21:29:44
Version Info:
CompanyName: Hwjfmbry TopohmsmFileDescription: Hwjfmbry Ebrwepfd HlbpvFileVersion: 106,60,69,128InternalName: HwjfmbryLegalCopyright: Copyright © Hwjfmbry Topohmsm 2004-2005OriginalFilename: Hwjfmbry.exeProductName: Hwjfmbry Ebrwepfd HlbpvProductVersion: 71,55,13,105Translation: 0x0409 0x04e4

Sirefef.646 also known as:

How to remove Sirefef.646?

• 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.