Malware analysis fiddler.exe Malicious activity | ANY.RUN

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File name:	fiddler.exe
Full analysis:	https://app.any.run/tasks/233b2afc-5b91-4fe6-a471-3ff37e591e80
Verdict:	Malicious activity
Threats:	NanoCore is a Remote Access Trojan or RAT. This malware is highly customizable with plugins which allow attackers to tailor its functionality to their needs. Nanocore is created with the .NET framework and it’s available for purchase for just $25 from its “official” website. Malware Trends Tracker >>>
Analysis date:	August 25, 2024, 13:34:42
OS:	Windows 10 Professional (build: 19045, 64 bit)
Tags:	netreactor nanocore
Indicators:
MIME:	application/x-dosexec
File info:	PE32 executable (GUI) Intel 80386 Mono/.Net assembly, for MS Windows
MD5:	71776EEAC76AC1591144338385374C5D
SHA1:	2273F36D078D132C44A16A1564E9D9FF01334D51
SHA256:	6D233149CF42F476907C45A4E63329D00AF0C78D9DAFE6F9CC5A38784206DB02
SSDEEP:	12288:5p+ThJ8q/0E+Lrs64xnYxjkUdB2PVVV1YBK:wb8q/0E+LA6YnYlk7UK

ANY.RUN is an interactive service which provides full access to the guest system. Information in this report could be distorted by user actions and is provided for user acknowledgement as it is. ANY.RUN does not guarantee maliciousness or safety of the content.

Launch configuration

Task duration:: 60 seconds
Heavy Evasion option:
Network geolocation:: off
Additional time used:: none
MITM proxy:: off
Privacy:: Public submission
Fakenet option:: off
Route via Tor:: off
Autoconfirmation of UAC:: on
Network:: on

Software preset

Internet Explorer 11.3636.19041.0
Adobe Acrobat (64-bit) (23.001.20093)
Adobe Flash Player 32 NPAPI (32.0.0.465)
Adobe Flash Player 32 PPAPI (32.0.0.465)
CCleaner (6.20)
FileZilla 3.65.0 (3.65.0)
Google Chrome (122.0.6261.70)
Google Update Helper (1.3.36.51)
Java 8 Update 271 (64-bit) (8.0.2710.9)
Java Auto Updater (2.8.271.9)
Microsoft Edge (122.0.2365.59)
Microsoft Edge Update (1.3.185.17)
Microsoft Office Professional 2019 - de-de (16.0.16026.20146)
Microsoft Office Professional 2019 - en-us (16.0.16026.20146)
Microsoft Office Professional 2019 - es-es (16.0.16026.20146)
Microsoft Office Professional 2019 - it-it (16.0.16026.20146)
Microsoft Office Professional 2019 - ja-jp (16.0.16026.20146)
Microsoft Office Professional 2019 - ko-kr (16.0.16026.20146)
Microsoft Office Professional 2019 - pt-br (16.0.16026.20146)
Microsoft Office Professional 2019 - tr-tr (16.0.16026.20146)
Microsoft Office Professionnel 2019 - fr-fr (16.0.16026.20146)
Microsoft Office профессиональный 2019 - ru-ru (16.0.16026.20146)
Microsoft OneNote - en-us (16.0.16026.20146)
Microsoft Update Health Tools (3.74.0.0)
Microsoft Visual C++ 2013 Redistributable (x64) - 12.0.30501 (12.0.30501.0)
Microsoft Visual C++ 2013 x64 Additional Runtime - 12.0.21005 (12.0.21005)
Microsoft Visual C++ 2013 x64 Minimum Runtime - 12.0.21005 (12.0.21005)
Microsoft Visual C++ 2015-2022 Redistributable (x64) - 14.36.32532 (14.36.32532.0)
Microsoft Visual C++ 2015-2022 Redistributable (x86) - 14.36.32532 (14.36.32532.0)
Microsoft Visual C++ 2022 X64 Additional Runtime - 14.36.32532 (14.36.32532)
Microsoft Visual C++ 2022 X64 Minimum Runtime - 14.36.32532 (14.36.32532)
Microsoft Visual C++ 2022 X86 Additional Runtime - 14.36.32532 (14.36.32532)
Microsoft Visual C++ 2022 X86 Minimum Runtime - 14.36.32532 (14.36.32532)
Mozilla Firefox (x64 en-US) (123.0)
Mozilla Maintenance Service (123.0)
Notepad++ (64-bit x64) (7.9.1)
Office 16 Click-to-Run Extensibility Component (16.0.15726.20202)
Office 16 Click-to-Run Licensing Component (16.0.16026.20146)
Office 16 Click-to-Run Localization Component (16.0.15726.20202)
Office 16 Click-to-Run Localization Component (16.0.15928.20198)
PowerShell 7-x64 (7.3.5.0)
Skype version 8.104 (8.104)
Update for Windows 10 for x64-based Systems (KB4023057) (2.59.0.0)
Update for Windows 10 for x64-based Systems (KB4023057) (2.63.0.0)
Update for Windows 10 for x64-based Systems (KB4480730) (2.55.0.0)
Update for Windows 10 for x64-based Systems (KB5001716) (8.93.0.0)
VLC media player (3.0.11)
WinRAR 5.91 (64-bit) (5.91.0)
Windows PC Health Check (3.6.2204.08001)

Hotfixes

Client LanguagePack Package
DotNetRollup
DotNetRollup 481
FodMetadata Package
Foundation Package
Hello Face Package
InternetExplorer Optional Package
KB5003791
KB5011048
KB5015684
KB5033052
LanguageFeatures Basic en us Package
LanguageFeatures Handwriting en us Package
LanguageFeatures OCR en us Package
LanguageFeatures Speech en us Package
LanguageFeatures TextToSpeech en us Package
MSPaint FoD Package
MediaPlayer Package
Microsoft OneCore ApplicationModel Sync Desktop FOD Package
Microsoft OneCore DirectX Database FOD Package
NetFx3 OnDemand Package
Notepad FoD Package
OpenSSH Client Package
PowerShell ISE FOD Package
Printing PMCPPC FoD Package
Printing WFS FoD Package
ProfessionalEdition
QuickAssist Package
RollupFix
ServicingStack
ServicingStack 3989
StepsRecorder Package
TabletPCMath Package
UserExperience Desktop Package
WordPad FoD Package

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MALICIOUS
- Changes the autorun value in the registry
  - fiddler.exe (PID: 6700)
- NANOCORE has been detected (YARA)
  - a1punf5t2of.exe (PID: 5624)
SUSPICIOUS
- Drops the executable file immediately after the start
  - fiddler.exe (PID: 6700)
- Reads security settings of Internet Explorer
  - fiddler.exe (PID: 6700)
  - a1punf5t2of.exe (PID: 5624)
- Reads the date of Windows installation
  - fiddler.exe (PID: 6700)
- Checks Windows Trust Settings
  - fiddler.exe (PID: 6700)
  - a1punf5t2of.exe (PID: 5624)
- Starts itself from another location
  - fiddler.exe (PID: 6700)
- Application launched itself
  - a1punf5t2of.exe (PID: 5624)
INFO
- Reads the machine GUID from the registry
  - fiddler.exe (PID: 6700)
  - a1punf5t2of.exe (PID: 5624)
- Creates files or folders in the user directory
  - fiddler.exe (PID: 6700)
- .NET Reactor protector has been detected
  - fiddler.exe (PID: 6700)
  - a1punf5t2of.exe (PID: 5624)
  - a1punf5t2of.exe (PID: 6488)
- Reads the computer name
  - fiddler.exe (PID: 6700)
  - a1punf5t2of.exe (PID: 5624)
- Process checks computer location settings
  - fiddler.exe (PID: 6700)
- Checks supported languages
  - fiddler.exe (PID: 6700)
  - a1punf5t2of.exe (PID: 5624)

Find more information about signature artifacts and mapping to MITRE ATT&CK™ MATRIX at the full report

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No Malware configuration.

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TRiD

.dll	\|	Win32 Dynamic Link Library (generic) (38.3)
.exe	\|	Win32 Executable (generic) (26.2)
.exe	\|	Win16/32 Executable Delphi generic (12)
.exe	\|	Generic Win/DOS Executable (11.6)
.exe	\|	DOS Executable Generic (11.6)

EXIF

EXE

MachineType:	Intel 386 or later, and compatibles
TimeStamp:	2020:07:13 16:01:05+00:00
ImageFileCharacteristics:	Executable, No line numbers, No symbols, 32-bit
PEType:	PE32
LinkerVersion:	6
CodeSize:	243712
InitializedDataSize:	23552
UninitializedDataSize:	-
EntryPoint:	0x3d69e
OSVersion:	4
ImageVersion:	-
SubsystemVersion:	4
Subsystem:	Windows GUI
FileVersionNumber:	5.0.20192.25091
ProductVersionNumber:	5.0.20192.25091
FileFlagsMask:	0x0000
FileFlags:	(none)
FileOS:	Win32
ObjectFileType:	Executable application
FileSubtype:	-
LanguageCode:	English (U.S.)
CharacterSet:	Windows, Latin1
Comments:	http://www.telerik.com/fiddler
CompanyName:	Telerik
FileDescription:	Installer for Progress Telerik Fiddler Web Debugger
FileVersion:	5.0.20192.25091
LegalCopyright:	Copyright ©2003 - 2019 Telerik EAD. All rights reserved.
ProductName:	Progress Telerik Fiddler Setup
ProductVersion:	5.0.20192.25091

No data.

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All screenshots are available in the full report

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Total processes

132

Monitored processes

Malicious processes

Suspicious processes

Behavior graph

Click at the process to see the details

Process information

PID

CMD

Path

Indicators

Parent process

5624

"C:\Users\admin\AppData\Roaming\b1b2dqljdx3\a1punf5t2of.exe"

C:\Users\admin\AppData\Roaming\b1b2dqljdx3\a1punf5t2of.exe

fiddler.exe

User:

admin

Company:

Telerik

Integrity Level:

HIGH

Description:

Installer for Progress Telerik Fiddler Web Debugger

Exit code:

Version:

5.0.20192.25091

Modules

Images
c:\users\admin\appdata\roaming\b1b2dqljdx3\a1punf5t2of.exe
c:\windows\system32\ntdll.dll
c:\windows\syswow64\ntdll.dll
c:\windows\system32\wow64.dll
c:\windows\system32\wow64win.dll
c:\windows\system32\wow64cpu.dll
c:\windows\syswow64\mscoree.dll
c:\windows\syswow64\kernel32.dll
c:\windows\syswow64\kernelbase.dll
c:\windows\syswow64\apphelp.dll

6488

"C:\Users\admin\AppData\Roaming\b1b2dqljdx3\a1punf5t2of.exe"

C:\Users\admin\AppData\Roaming\b1b2dqljdx3\a1punf5t2of.exe

a1punf5t2of.exe

User:

admin

Company:

Telerik

Integrity Level:

HIGH

Description:

Installer for Progress Telerik Fiddler Web Debugger

Version:

5.0.20192.25091

6652

"C:\Users\admin\Desktop\fiddler.exe"

C:\Users\admin\Desktop\fiddler.exe

—

explorer.exe

User:

admin

Company:

Telerik

Integrity Level:

MEDIUM

Description:

Installer for Progress Telerik Fiddler Web Debugger

Exit code:

3221226540

Version:

5.0.20192.25091

Modules

Images
c:\users\admin\desktop\fiddler.exe
c:\windows\system32\ntdll.dll
c:\windows\syswow64\ntdll.dll

6700

"C:\Users\admin\Desktop\fiddler.exe"

C:\Users\admin\Desktop\fiddler.exe

explorer.exe

User:

admin

Company:

Telerik

Integrity Level:

HIGH

Description:

Installer for Progress Telerik Fiddler Web Debugger

Exit code:

Version:

5.0.20192.25091

Modules

Images
c:\users\admin\desktop\fiddler.exe
c:\windows\system32\ntdll.dll
c:\windows\syswow64\ntdll.dll
c:\windows\system32\wow64.dll
c:\windows\system32\wow64win.dll
c:\windows\system32\wow64cpu.dll
c:\windows\syswow64\mscoree.dll
c:\windows\syswow64\kernel32.dll
c:\windows\syswow64\kernelbase.dll
c:\windows\syswow64\apphelp.dll

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Total events

3 870

Read events

3 861

Write events

Delete events

Modification events


(PID) Process:	(6700) fiddler.exe	Key:	HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
Operation:	write	Name:	b1b2dqljdx3
Value: C:\Users\admin\AppData\Roaming\b1b2dqljdx3\a1punf5t2of.exe
(PID) Process:	(6700) fiddler.exe	Key:	HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\ZoneMap
Operation:	write	Name:	ProxyBypass
Value: 1
(PID) Process:	(6700) fiddler.exe	Key:	HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\ZoneMap
Operation:	write	Name:	IntranetName
Value: 1
(PID) Process:	(6700) fiddler.exe	Key:	HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\ZoneMap
Operation:	write	Name:	UNCAsIntranet
Value: 1
(PID) Process:	(6700) fiddler.exe	Key:	HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\ZoneMap
Operation:	write	Name:	AutoDetect
Value: 0

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Executable files

Suspicious files

Text files

Unknown types

Dropped files

PID	Process	Filename		Type
6700	fiddler.exe	C:\Users\admin\AppData\Roaming\b1b2dqljdx3\a1punf5t2of.exe		binary
		MD5:2774A179C941459EB399558F6C48803E	SHA256:1B34F0F8EC5228FB7AA3B7BFB7BAC3684E50E9FF01183FC70C2E86658557BFDF

Download PCAP, analyze network streams, HTTP content and a lot more at the full report

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HTTP(S) requests

TCP/UDP connections

DNS requests

Threats

HTTP requests

PID	Process	Method	HTTP Code	IP	URL	CN	Type	Size	Reputation
6356	SIHClient.exe	GET	200	23.52.120.96:80	http://www.microsoft.com/pkiops/crl/Microsoft%20ECC%20Product%20Root%20Certificate%20Authority%202018.crl	unknown	—	—	whitelisted
6356	SIHClient.exe	GET	200	23.52.120.96:80	http://www.microsoft.com/pkiops/crl/Microsoft%20ECC%20Update%20Secure%20Server%20CA%202.1.crl	unknown	—	—	whitelisted
3276	svchost.exe	GET	200	192.229.221.95:80	http://ocsp.digicert.com/MFEwTzBNMEswSTAJBgUrDgMCGgUABBSAUQYBMq2awn1Rh6Doh%2FsBYgFV7gQUA95QNVbRTLtm8KPiGxvDl7I90VUCEAJ0LqoXyo4hxxe7H%2Fz9DKA%3D	unknown	—	—	whitelisted

Download PCAP, analyze network streams, HTTP content and a lot more at the full report

Connections

PID	Process	IP	Domain	ASN	CN	Reputation
3304	svchost.exe	40.127.240.158:443	settings-win.data.microsoft.com	MICROSOFT-CORP-MSN-AS-BLOCK	IE	unknown
4	System	192.168.100.255:138	—	—	—	whitelisted
568	RUXIMICS.exe	40.127.240.158:443	settings-win.data.microsoft.com	MICROSOFT-CORP-MSN-AS-BLOCK	IE	unknown
2120	MoUsoCoreWorker.exe	40.127.240.158:443	settings-win.data.microsoft.com	MICROSOFT-CORP-MSN-AS-BLOCK	IE	unknown
3304	svchost.exe	4.231.128.59:443	settings-win.data.microsoft.com	MICROSOFT-CORP-MSN-AS-BLOCK	IE	whitelisted
2120	MoUsoCoreWorker.exe	20.73.194.208:443	settings-win.data.microsoft.com	MICROSOFT-CORP-MSN-AS-BLOCK	NL	whitelisted
3260	svchost.exe	40.113.103.199:443	client.wns.windows.com	MICROSOFT-CORP-MSN-AS-BLOCK	NL	whitelisted
6356	SIHClient.exe	40.127.169.103:443	slscr.update.microsoft.com	MICROSOFT-CORP-MSN-AS-BLOCK	IE	unknown
6356	SIHClient.exe	23.52.120.96:80	www.microsoft.com	AKAMAI-AS	DE	unknown
6356	SIHClient.exe	52.165.164.15:443	fe3cr.delivery.mp.microsoft.com	MICROSOFT-CORP-MSN-AS-BLOCK	US	unknown

DNS requests

Domain	IP	Reputation
settings-win.data.microsoft.com	40.127.240.158 4.231.128.59 20.73.194.208	whitelisted
google.com	216.58.206.78	whitelisted
client.wns.windows.com	40.113.103.199	whitelisted
slscr.update.microsoft.com	40.127.169.103	whitelisted
www.microsoft.com	23.52.120.96	whitelisted
fe3cr.delivery.mp.microsoft.com	52.165.164.15	whitelisted
login.live.com	40.126.32.140 20.190.160.14 40.126.32.76 20.190.160.20 40.126.32.134 40.126.32.74 20.190.160.22 20.190.160.17	whitelisted
ocsp.digicert.com	192.229.221.95	whitelisted
nexusrules.officeapps.live.com	52.111.227.14	whitelisted

Threats

No threats detected

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No debug info

General Info

fiddler.exe

71776EEAC76AC1591144338385374C5D

2273F36D078D132C44A16A1564E9D9FF01334D51

6D233149CF42F476907C45A4E63329D00AF0C78D9DAFE6F9CC5A38784206DB02

12288:5p+ThJ8q/0E+Lrs64xnYxjkUdB2PVVV1YBK:wb8q/0E+LA6YnYlk7UK

Software environment set and analysis options

Launch configuration

Software preset

Hotfixes

Behavior activities

MALICIOUS

Changes the autorun value in the registry

NANOCORE has been detected (YARA)

SUSPICIOUS

Drops the executable file immediately after the start

Reads security settings of Internet Explorer

Reads the date of Windows installation

Checks Windows Trust Settings

Starts itself from another location

Application launched itself

INFO

Reads the machine GUID from the registry

Creates files or folders in the user directory

.NET Reactor protector has been detected

Reads the computer name

Process checks computer location settings

Checks supported languages

Malware configuration

Static information

TRiD

EXIF

EXE

Video and screenshots

Processes

Behavior graph

Specs description

Process information

Information

Modules

Information

Information

Modules

Information

Modules

Registry activity

Modification events

Files activity

Dropped files

Network activity

HTTP requests

Connections

DNS requests

Threats

Debug output strings