Should I remove “Trojan:Win32/Estiwir.C”?

The Trojan:Win32/Estiwir.C 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 Trojan:Win32/Estiwir.C virus can do?

• SetUnhandledExceptionFilter detected (possible anti-debug)
• Behavioural detection: Executable code extraction – unpacking
• 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
• Performs HTTP requests potentially not found in PCAP.
• CAPE extracted potentially suspicious content
• Unconventionial binary language: Chinese (Simplified)
• Unconventionial language used in binary resources: Chinese (Simplified)
• The binary contains an unknown PE section name indicative of packing
• Executable file is packed/obfuscated with MPRESS
• Authenticode signature is invalid
• Uses Windows utilities for basic functionality
• Behavioural detection: Injection (Process Hollowing)
• Executed a process and injected code into it, probably while unpacking
• Deletes its original binary from disk
• Behavioural detection: Injection (inter-process)
• Installs itself for autorun at Windows startup
• Uses suspicious command line tools or Windows utilities

How to determine Trojan:Win32/Estiwir.C?

File Info:
name: B876DF88BB39020501E4.mlwpath: /opt/CAPEv2/storage/binaries/8f2821bc4b19f32205578916c31937f14f48f76c57cee66d7077773dde839641crc32: 905121E1md5: b876df88bb39020501e4990fddf12187sha1: 18ae5492b5181398f94fdcfefbe80df17c0c7229sha256: 8f2821bc4b19f32205578916c31937f14f48f76c57cee66d7077773dde839641sha512: f6f938942d7d8ccf166982f66eb2728df47601384d1ab2a15ed2f6a8b6e8412ce164bb6da05bb85951e6877ed981820892f953c21e13e320b635f99fcc8295dbssdeep: 3072:UT9zjiI3H3CeQ75DxCjWyGlJpklF/hXa0dEXFC0c:UT9zG0XZQtDxlyqMrdE19ctype: PE32 executable (GUI) Intel 80386, for MS Windowstlsh: T10304D0D38E205C6DEC474A3118B7E73E753196400D908DEAF79ADD696CB67A12A0B20Fsha3_384: d4476fc0afa316ecd6a6d1a2b43f89e6c833e81e9703bdcfaf5780fc629ba1a654ea4a48858f6ef5354e5bbd87b19532ep_bytes: 682f9a4200e8b47502007441ab909090timestamp: 2015-05-01 09:14:43
Version Info:
CompanyName: TencentFileDescription: 腾讯QQFileVersion: 6.9.13791.0LegalCopyright: Copyright (C) 1999-2015 Tencent. All Rights ReservedProductName: 腾讯QQProductVersion: 6.9.13791.0Translation: 0x0804 0x04b0

Trojan:Win32/Estiwir.C also known as:

How to remove Trojan:Win32/Estiwir.C?

• 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.