Malware analysis nightflex.exe Malicious activity | ANY.RUN

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File name:	nightflex.exe
Full analysis:	https://app.any.run/tasks/84ff92f9-4693-42eb-ab02-9a4ad1f23d6e
Verdict:	Malicious activity
Analysis date:	September 24, 2024, 12:55:52
OS:	Windows 10 Professional (build: 19045, 64 bit)
Tags:	xor-url generic
Indicators:
MIME:	application/x-dosexec
File info:	PE32+ executable (console) x86-64, for MS Windows
MD5:	D156E86BA6ED0C36FEA3E3F51A625FFD
SHA1:	5139DB53293622334B2273EDE9263B5BD999ADA3
SHA256:	B05BA2ED0605E10B0DC3F962BEEFF96A6079C55CEE3280A7E35DB72F4A357084
SSDEEP:	49152:oeMjDCVYs0gkXwBD18LrjcXOWtJn5duAPzAn+g:fS7qHn5du

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
- XORed URL has been found (YARA)
  - nightflex.exe (PID: 2660)
SUSPICIOUS
- Reads security settings of Internet Explorer
  - nightflex.exe (PID: 2660)
- Reads the date of Windows installation
  - nightflex.exe (PID: 2660)
- Drops a system driver (possible attempt to evade defenses)
  - nightflex.exe (PID: 2660)
- Executable content was dropped or overwritten
  - nightflex.exe (PID: 2660)
- Start notepad (likely ransomware note)
  - nightflex.exe (PID: 2660)
INFO
- Checks supported languages
  - nightflex.exe (PID: 2660)
- Checks proxy server information
  - nightflex.exe (PID: 2660)
- Reads the computer name
  - nightflex.exe (PID: 2660)
- The process uses the downloaded file
  - nightflex.exe (PID: 2660)
- Process checks computer location settings
  - nightflex.exe (PID: 2660)

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

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xor-url

(PID) Process(2660) nightflex.exe

Decrypted-URLs (1)http://147.78.103.70/Zwdfqj12932WFNp/2CWQd71234x/zm1r3c216DFxrtf34213z/12345600.exe

No Malware configuration.

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TRiD

.exe	\|	Win64 Executable (generic) (87.3)
.exe	\|	Generic Win/DOS Executable (6.3)
.exe	\|	DOS Executable Generic (6.3)

EXIF

EXE

MachineType:	AMD AMD64
TimeStamp:	2024:09:24 12:52:13+00:00
ImageFileCharacteristics:	Executable, Large address aware
PEType:	PE32+
LinkerVersion:	14.4
CodeSize:	304128
InitializedDataSize:	969216
UninitializedDataSize:	-
EntryPoint:	0x49ca0
OSVersion:	6
ImageVersion:	-
SubsystemVersion:	6
Subsystem:	Windows command line

No data.

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All screenshots are available in the full report

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Total processes

125

Monitored processes

Malicious processes

Suspicious processes

Behavior graph

Click at the process to see the details

Process information

PID

CMD

Path

Indicators

Parent process

2660

"C:\Users\admin\AppData\Local\Temp\nightflex.exe"

C:\Users\admin\AppData\Local\Temp\nightflex.exe

explorer.exe

User:

admin

Integrity Level:

HIGH

Exit code:

Modules

Images
c:\users\admin\appdata\local\temp\nightflex.exe
c:\windows\system32\ntdll.dll
c:\windows\system32\kernel32.dll
c:\windows\system32\kernelbase.dll
c:\windows\system32\apphelp.dll
c:\windows\system32\user32.dll
c:\windows\system32\win32u.dll
c:\windows\system32\gdi32.dll
c:\windows\system32\gdi32full.dll
c:\windows\system32\msvcp_win.dll

xor-url

(PID) Process(2660) nightflex.exe

Decrypted-URLs (1)http://147.78.103.70/Zwdfqj12932WFNp/2CWQd71234x/zm1r3c216DFxrtf34213z/12345600.exe

4176

\??\C:\WINDOWS\system32\conhost.exe 0xffffffff -ForceV1

C:\Windows\System32\conhost.exe

—

nightflex.exe

User:

admin

Company:

Microsoft Corporation

Integrity Level:

HIGH

Description:

Console Window Host

Exit code:

Version:

10.0.19041.1 (WinBuild.160101.0800)

Modules

Images
c:\windows\system32\conhost.exe
c:\windows\system32\ntdll.dll
c:\windows\system32\kernel32.dll
c:\windows\system32\kernelbase.dll
c:\windows\system32\msvcp_win.dll
c:\windows\system32\ucrtbase.dll
c:\windows\system32\shcore.dll
c:\windows\system32\msvcrt.dll
c:\windows\system32\combase.dll
c:\windows\system32\rpcrt4.dll

6296

"C:\Windows\SysWOW64\notepad.exe"

C:\Windows\SysWOW64\notepad.exe

—

nightflex.exe

User:

admin

Company:

Microsoft Corporation

Integrity Level:

HIGH

Description:

Notepad

Version:

10.0.19041.1 (WinBuild.160101.0800)

Modules

Images
c:\windows\syswow64\notepad.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\kernel32.dll
c:\windows\syswow64\kernelbase.dll
c:\windows\syswow64\apphelp.dll
c:\windows\syswow64\gdi32.dll

6452

"C:\Users\admin\AppData\Local\Temp\nightflex.exe"

C:\Users\admin\AppData\Local\Temp\nightflex.exe

—

explorer.exe

User:

admin

Integrity Level:

MEDIUM

Exit code:

3221226540

Modules

Images
c:\users\admin\appdata\local\temp\nightflex.exe
c:\windows\system32\ntdll.dll

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Total events

653

Read events

653

Write events

Delete events

Modification events

No data

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Executable files

Suspicious files

Text files

Unknown types

Dropped files

PID	Process	Filename		Type
2660	nightflex.exe	C:\Windows\SoftwareDistribution\Download\drvloader.exe		executable
		MD5:34CFBE3FF70461820CCC31A1AFEEC0B3	SHA256:6EBCC6896B243C761DA4FC28A26249B0C146AE17AFF7697C09BC447008E831DF
2660	nightflex.exe	C:\Windows\SoftwareDistribution\Download\vac.sys		executable
		MD5:B99B3FBB9B3ED6E36F0A4DF3E020C125	SHA256:89B5EEAB7CB54502D6A98139D642D417FCF8BF89E45ACB597FDE962FB634930B

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
2120	MoUsoCoreWorker.exe	GET	200	184.30.21.171:80	http://www.microsoft.com/pkiops/crl/MicSecSerCA2011_2011-10-18.crl	unknown	—	—	whitelisted
5028	svchost.exe	GET	200	192.229.221.95:80	http://ocsp.digicert.com/MFEwTzBNMEswSTAJBgUrDgMCGgUABBSAUQYBMq2awn1Rh6Doh%2FsBYgFV7gQUA95QNVbRTLtm8KPiGxvDl7I90VUCEAJ0LqoXyo4hxxe7H%2Fz9DKA%3D	unknown	—	—	whitelisted
2476	SIHClient.exe	GET	200	184.30.21.171:80	http://www.microsoft.com/pkiops/crl/Microsoft%20ECC%20Product%20Root%20Certificate%20Authority%202018.crl	unknown	—	—	whitelisted
2476	SIHClient.exe	GET	200	184.30.21.171:80	http://www.microsoft.com/pkiops/crl/Microsoft%20ECC%20Update%20Secure%20Server%20CA%202.1.crl	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
—	—	13.69.116.109:443	—	MICROSOFT-CORP-MSN-AS-BLOCK	NL	unknown
4	System	192.168.100.255:138	—	—	—	whitelisted
—	—	104.126.37.153:443	—	Akamai International B.V.	DE	unknown
—	—	4.231.128.59:443	settings-win.data.microsoft.com	MICROSOFT-CORP-MSN-AS-BLOCK	IE	whitelisted
2120	MoUsoCoreWorker.exe	184.30.21.171:80	www.microsoft.com	AKAMAI-AS	DE	whitelisted
3888	svchost.exe	239.255.255.250:1900	—	—	—	whitelisted
2660	nightflex.exe	147.78.103.70:80	—	OMER AY	US	unknown
—	—	20.190.155.130:443	login.live.com	MICROSOFT-CORP-MSN-AS-BLOCK	US	whitelisted
5028	svchost.exe	192.229.221.95:80	ocsp.digicert.com	EDGECAST	US	whitelisted
5028	svchost.exe	20.190.155.130:443	login.live.com	MICROSOFT-CORP-MSN-AS-BLOCK	US	whitelisted

DNS requests

Domain	IP	Reputation
settings-win.data.microsoft.com	4.231.128.59 40.127.240.158	whitelisted
www.microsoft.com	184.30.21.171	whitelisted
google.com	142.250.185.238	whitelisted
login.live.com	20.190.155.130 20.190.155.67 20.190.155.66 20.190.155.1 20.190.155.65 20.190.155.132 20.190.155.3 40.126.27.66	whitelisted
ocsp.digicert.com	192.229.221.95	whitelisted
slscr.update.microsoft.com	4.175.87.197	whitelisted
fe3cr.delivery.mp.microsoft.com	13.95.31.18	whitelisted
nexusrules.officeapps.live.com	52.111.227.14	whitelisted

Threats

No threats detected

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No debug info

General Info

nightflex.exe

D156E86BA6ED0C36FEA3E3F51A625FFD

5139DB53293622334B2273EDE9263B5BD999ADA3

B05BA2ED0605E10B0DC3F962BEEFF96A6079C55CEE3280A7E35DB72F4A357084

49152:oeMjDCVYs0gkXwBD18LrjcXOWtJn5duAPzAn+g:fS7qHn5du

Software environment set and analysis options

Launch configuration

Software preset

Hotfixes

Behavior activities

MALICIOUS

XORed URL has been found (YARA)

SUSPICIOUS

Reads security settings of Internet Explorer

Reads the date of Windows installation

Drops a system driver (possible attempt to evade defenses)

Executable content was dropped or overwritten

Start notepad (likely ransomware note)

INFO

Checks supported languages

Checks proxy server information

Reads the computer name

The process uses the downloaded file

Process checks computer location settings

Malware configuration

xor-url

Static information

TRiD

EXIF

EXE

Video and screenshots

Processes

Behavior graph

Specs description

Process information

Information

Modules

Malware configuration

xor-url

Information

Modules

Information

Modules

Information

Modules

Registry activity

Modification events

Files activity

Dropped files

Network activity

HTTP requests

Connections

DNS requests

Threats

Debug output strings