Backdoor:WinNT/Knockex!rfn (file analysis)

The Backdoor:WinNT/Knockex!rfn 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 Backdoor:WinNT/Knockex!rfn virus can do?

Reads data out of its own binary image
Drops a binary and executes it
The binary likely contains encrypted or compressed data.
Installs itself for autorun at Windows startup
Network activity detected but not expressed in API logs

Related domains:

z.whorecord.xyz

a.tomx.xyz

How to determine Backdoor:WinNT/Knockex!rfn?


File Info:
crc32: 17347DBC
md5: 91027dd7468e8836631a8793d73164fd
name: upload_file
sha1: 02482738aebf223e424f34dfe9eefc55671caf65
sha256: b87295a4b2fb2d2f4df9d502d52e2f50a5e9b3ba9f56b17e252fa0f3022ae6f4
sha512: 4e6657921dad88c4f51e70809ccc6d661c7c545084f8a09591625a783fb6859c1b9db820f958cb62b2e1a333d43e326d8922fd6103bea19c7645058156e07f8a
ssdeep: 98304:nviz/27qWGq/TzuqCDl2Ptao7jsyqRgkhPsj9Nr:nviq75/TzufI8PeNr
type: PE32 executable (GUI) Intel 80386, for MS Windows

Version Info:
LegalCopyright: xa9 Microsoft Corporation. All rights reserved.
InternalName: Wextract                
FileVersion: 11.00.17763.1 (WinBuild.160101.0800)
CompanyName: Microsoft Corporation
ProductName: Internet Explorer
ProductVersion: 11.00.17763.1
FileDescription: Win32 Cabinet Self-Extractor                                           
OriginalFilename: WEXTRACT.EXE            .MUI
Translation: 0x0409 0x04b0

Backdoor:WinNT/Knockex!rfn also known as:

MicroWorld-eScan	Trojan.GenericKD.43559693
FireEye	Generic.mg.91027dd7468e8836
McAfee	Artemis!91027DD7468E
Cylance	Unsafe
CrowdStrike	win/malicious_confidence_90% (W)
BitDefender	Trojan.GenericKD.43559693
K7GW	Trojan ( 00539f6a1 )
K7AntiVirus	Trojan ( 00539f6a1 )
Invincea	heuristic
Symantec	ML.Attribute.HighConfidence
APEX	Malicious
Avast	Win32:Trojan-gen
ClamAV	Win.Malware.Generic-6895514-0
Kaspersky	HEUR:Trojan.Win32.Generic
Alibaba	TrojanDropper:Win32/Generic.f731f06d
AegisLab	Trojan.Win32.Generic.4!c
Tencent	Win32.Trojan-dropper.Agent.Hoxm
Ad-Aware	Trojan.GenericKD.43559693
Emsisoft	Trojan.GenericKD.43559693 (B)
F-Secure	Trojan.TR/Drop.Agent.vsdtf
DrWeb	Trojan.DownLoader26.43550
Fortinet	W32/Agent.RVD!tr
Sophos	Mal/Generic-S
Ikarus	Trojan.Win32.Cab
Avira	TR/Drop.Agent.vsdtf
MAX	malware (ai score=82)
Arcabit	Trojan.Generic.D298AB0D
ZoneAlarm	HEUR:Trojan.Win32.Generic
Microsoft	Backdoor:WinNT/Knockex!rfn
AhnLab-V3	Trojan/Win32.Agent.C4171260
ALYac	Trojan.GenericKD.43559693
Malwarebytes	Trojan.Dropper.CAB
ESET-NOD32	a variant of Win32/TrojanDropper.Agent.RVE
Rising	Malware.Undefined!8.C (CLOUD)
GData	Trojan.GenericKD.43559693
AVG	Win32:Trojan-gen
Cybereason	malicious.8aebf2
Paloalto	generic.ml
Qihoo-360	Generic/HEUR/QVM20.1.DE1B.Malware.Gen

How to remove Backdoor:WinNT/Knockex!rfn?

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.

Backdoor:WinNT/Knockex!rfn (file analysis)