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Windows Analysis Report
service_worker.js

Overview

General Information

Sample name:	service_worker.js
Analysis ID:	1592719
MD5:	2972a9c6152c7159fdb8c33a3416d005
SHA1:	718de78402941307ad7d91fbb06841bde79485e3
SHA256:	932354c931c20d823b9a9bb079f0dc075782ace7c14ca8e2dd4ba425fff9402f
Infos:

Detection

Score:	52
Range:	0 - 100
Whitelisted:	false
Confidence:	100%

Signatures

Multi AV Scanner detection for submitted file

Sigma detected: WScript or CScript Dropper

Found WSH timer for Javascript or VBS script (likely evasive script)

Java / VBScript file with very long strings (likely obfuscated code)

Program does not show much activity (idle)

Sigma detected: WSF/JSE/JS/VBA/VBE File Execution Via Cscript/Wscript

Classification

Process Tree

System is w10x64

wscript.exe (PID: 6908 cmdline: C:\Windows\System32\WScript.exe "C:\Users\user\Desktop\service_worker.js" MD5: A47CBE969EA935BDD3AB568BB126BC80)

cleanup

Sigma Signatures

System Summary

Sigma detected: WScript or CScript Dropper

Source: Process started

Author: Margaritis Dimitrios (idea), Florian Roth (Nextron Systems), oscd.community: Data: Command: C:\Windows\System32\WScript.exe "C:\Users\user\Desktop\service_worker.js", CommandLine: C:\Windows\System32\WScript.exe "C:\Users\user\Desktop\service_worker.js", CommandLine|base64offset|contains: , Image: C:\Windows\System32\wscript.exe, NewProcessName: C:\Windows\System32\wscript.exe, OriginalFileName: C:\Windows\System32\wscript.exe, ParentCommandLine: , ParentImage: , ParentProcessId: 2580, ProcessCommandLine: C:\Windows\System32\WScript.exe "C:\Users\user\Desktop\service_worker.js", ProcessId: 6908, ProcessName: wscript.exe

Sigma detected: WSF/JSE/JS/VBA/VBE File Execution Via Cscript/Wscript

Source: Process started

Author: Michael Haag: Data: Command: C:\Windows\System32\WScript.exe "C:\Users\user\Desktop\service_worker.js", CommandLine: C:\Windows\System32\WScript.exe "C:\Users\user\Desktop\service_worker.js", CommandLine|base64offset|contains: , Image: C:\Windows\System32\wscript.exe, NewProcessName: C:\Windows\System32\wscript.exe, OriginalFileName: C:\Windows\System32\wscript.exe, ParentCommandLine: , ParentImage: , ParentProcessId: 2580, ProcessCommandLine: C:\Windows\System32\WScript.exe "C:\Users\user\Desktop\service_worker.js", ProcessId: 6908, ProcessName: wscript.exe

Suricata Signatures

⊘No Suricata rule has matched

Joe Sandbox Signatures

Click to jump to signature section

Show All Signature Results

AV Detection

Multi AV Scanner detection for submitted file

Source: service_worker.js

Virustotal: Detection: 24%

Perma Link

Source: wscript.exe, 00000000.00000002.1787009266.000001A6B47B5000.00000004.00000020.00020000.00000000.sdmp, wscript.exe, 00000000.00000002.1786941343.000001A6B4522000.00000004.00000020.00020000.00000000.sdmp, wscript.exe, 00000000.00000003.1786287394.000001A6B4515000.00000004.00000020.00020000.00000000.sdmp, service_worker.js	String found in binary or memory: https://francjohn.com/api/action/
Source: wscript.exe, 00000000.00000003.1786445607.000001A6B4521000.00000004.00000020.00020000.00000000.sdmp, wscript.exe, 00000000.00000003.1786372797.000001A6B452F000.00000004.00000020.00020000.00000000.sdmp, wscript.exe, 00000000.00000002.1787009266.000001A6B47B5000.00000004.00000020.00020000.00000000.sdmp, wscript.exe, 00000000.00000002.1786941343.000001A6B4522000.00000004.00000020.00020000.00000000.sdmp, wscript.exe, 00000000.00000003.1786287394.000001A6B4515000.00000004.00000020.00020000.00000000.sdmp, service_worker.js	String found in binary or memory: https://francjohn.com/api/config/
Source: wscript.exe, 00000000.00000003.1786445607.000001A6B4521000.00000004.00000020.00020000.00000000.sdmp, wscript.exe, 00000000.00000003.1786372797.000001A6B452F000.00000004.00000020.00020000.00000000.sdmp, wscript.exe, 00000000.00000002.1786941343.000001A6B4522000.00000004.00000020.00020000.00000000.sdmp, wscript.exe, 00000000.00000003.1786287394.000001A6B4515000.00000004.00000020.00020000.00000000.sdmp, service_worker.js	String found in binary or memory: https://francjohn.com/uninstall/

Source: service_worker.js

Initial sample: Strings found which are bigger than 50

Source: classification engine

Classification label: mal52.winJS@1/0@0/0

Source: C:\Windows\System32\wscript.exe

Key opened: HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows\Safer\CodeIdentifiers

Jump to behavior

Source: service_worker.js

Virustotal: Detection: 24%

Source: C:\Windows\System32\wscript.exe	Section loaded: version.dll	Jump to behavior
Source: C:\Windows\System32\wscript.exe	Section loaded: kernel.appcore.dll	Jump to behavior
Source: C:\Windows\System32\wscript.exe	Section loaded: uxtheme.dll	Jump to behavior
Source: C:\Windows\System32\wscript.exe	Section loaded: sxs.dll	Jump to behavior
Source: C:\Windows\System32\wscript.exe	Section loaded: jscript.dll	Jump to behavior
Source: C:\Windows\System32\wscript.exe	Section loaded: iertutil.dll	Jump to behavior
Source: C:\Windows\System32\wscript.exe	Section loaded: amsi.dll	Jump to behavior
Source: C:\Windows\System32\wscript.exe	Section loaded: userenv.dll	Jump to behavior
Source: C:\Windows\System32\wscript.exe	Section loaded: profapi.dll	Jump to behavior
Source: C:\Windows\System32\wscript.exe	Section loaded: wldp.dll	Jump to behavior
Source: C:\Windows\System32\wscript.exe	Section loaded: msasn1.dll	Jump to behavior
Source: C:\Windows\System32\wscript.exe	Section loaded: cryptsp.dll	Jump to behavior
Source: C:\Windows\System32\wscript.exe	Section loaded: rsaenh.dll	Jump to behavior
Source: C:\Windows\System32\wscript.exe	Section loaded: cryptbase.dll	Jump to behavior
Source: C:\Windows\System32\wscript.exe	Section loaded: msisip.dll	Jump to behavior
Source: C:\Windows\System32\wscript.exe	Section loaded: wshext.dll	Jump to behavior
Source: C:\Windows\System32\wscript.exe	Section loaded: scrobj.dll	Jump to behavior
Source: C:\Windows\System32\wscript.exe	Section loaded: textshaping.dll	Jump to behavior
Source: C:\Windows\System32\wscript.exe	Section loaded: textinputframework.dll	Jump to behavior
Source: C:\Windows\System32\wscript.exe	Section loaded: coreuicomponents.dll	Jump to behavior
Source: C:\Windows\System32\wscript.exe	Section loaded: coremessaging.dll	Jump to behavior
Source: C:\Windows\System32\wscript.exe	Section loaded: ntmarta.dll	Jump to behavior
Source: C:\Windows\System32\wscript.exe	Section loaded: wintypes.dll	Jump to behavior
Source: C:\Windows\System32\wscript.exe	Section loaded: wintypes.dll	Jump to behavior
Source: C:\Windows\System32\wscript.exe	Section loaded: wintypes.dll	Jump to behavior

Source: C:\Windows\System32\wscript.exe

Key value queried: HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{f414c260-6ac0-11cf-b6d1-00aa00bbbb58}\InprocServer32

Jump to behavior

Source: C:\Windows\System32\wscript.exe	Process information set: NOOPENFILEERRORBOX			Jump to behavior
Source: C:\Windows\System32\wscript.exe	Process information set: NOOPENFILEERRORBOX			Jump to behavior

Source: C:\Windows\System32\wscript.exe

Window found: window name: WSH-Timer

Jump to behavior

Source: all processes

Thread injection, dropped files, key value created, disk infection and DNS query: no activity detected

Source: all processes

Thread injection, dropped files, key value created, disk infection and DNS query: no activity detected

Source: C:\Windows\System32\wscript.exe

Key value queried: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Cryptography MachineGuid

Jump to behavior

Mitre Att&ck Matrix

Reconnaissance	Resource Development	Initial Access	Execution	Persistence	Privilege Escalation	Defense Evasion	Credential Access	Discovery	Lateral Movement	Collection	Command and Control	Exfiltration	Impact
Gather Victim Identity Information	2 Scripting	Valid Accounts	Windows Management Instrumentation	2 Scripting	1 DLL Side-Loading	1 DLL Side-Loading	OS Credential Dumping	2 System Information Discovery	Remote Services	Data from Local System	Data Obfuscation	Exfiltration Over Other Network Medium	Abuse Accessibility Features
Credentials	Domains	Default Accounts	Scheduled Task/Job	1 DLL Side-Loading	Boot or Logon Initialization Scripts	1 Obfuscated Files or Information	LSASS Memory	Application Window Discovery	Remote Desktop Protocol	Data from Removable Media	Junk Data	Exfiltration Over Bluetooth	Network Denial of Service

Behavior Graph

Hide Legend

Legend:

Process
Signature
Created File
DNS/IP Info
Is Dropped
Is Windows Process
Number of created Registry Values
Number of created Files
Visual Basic
Delphi
Java
.Net C# or VB.NET
C, C++ or other language
Is malicious
Internet

Source	Detection	Scanner	Label	Link
service_worker.js	24%	Virustotal		Browse
service_worker.js	8%	ReversingLabs

Source	Detection	Scanner	Label
https://francjohn.com/api/action/	0%	Avira URL Cloud	safe
https://francjohn.com/uninstall/	0%	Avira URL Cloud	safe
https://francjohn.com/api/config/	0%	Avira URL Cloud	safe

Name	Source	Malicious	Antivirus Detection	Reputation
https://francjohn.com/api/action/	wscript.exe, 00000000.00000002.1787009266.000001A6B47B5000.00000004.00000020.00020000.00000000.sdmp, wscript.exe, 00000000.00000002.1786941343.000001A6B4522000.00000004.00000020.00020000.00000000.sdmp, wscript.exe, 00000000.00000003.1786287394.000001A6B4515000.00000004.00000020.00020000.00000000.sdmp, service_worker.js	false	Avira URL Cloud: safe	unknown
https://francjohn.com/api/config/	wscript.exe, 00000000.00000003.1786445607.000001A6B4521000.00000004.00000020.00020000.00000000.sdmp, wscript.exe, 00000000.00000003.1786372797.000001A6B452F000.00000004.00000020.00020000.00000000.sdmp, wscript.exe, 00000000.00000002.1787009266.000001A6B47B5000.00000004.00000020.00020000.00000000.sdmp, wscript.exe, 00000000.00000002.1786941343.000001A6B4522000.00000004.00000020.00020000.00000000.sdmp, wscript.exe, 00000000.00000003.1786287394.000001A6B4515000.00000004.00000020.00020000.00000000.sdmp, service_worker.js	false	Avira URL Cloud: safe	unknown
https://francjohn.com/uninstall/	wscript.exe, 00000000.00000003.1786445607.000001A6B4521000.00000004.00000020.00020000.00000000.sdmp, wscript.exe, 00000000.00000003.1786372797.000001A6B452F000.00000004.00000020.00020000.00000000.sdmp, wscript.exe, 00000000.00000002.1786941343.000001A6B4522000.00000004.00000020.00020000.00000000.sdmp, wscript.exe, 00000000.00000003.1786287394.000001A6B4515000.00000004.00000020.00020000.00000000.sdmp, service_worker.js	false	Avira URL Cloud: safe	unknown

World Map of Contacted IPs

⊘No contacted IP infos

General Information

Joe Sandbox version:	42.0.0 Malachite
Analysis ID:	1592719
Start date and time:	2025-01-16 13:17:41 +01:00
Joe Sandbox product:	CloudBasic
Overall analysis duration:	0h 1m 52s
Hypervisor based Inspection enabled:	false
Report type:	full
Cookbook file name:	default.jbs
Analysis system description:	Windows 10 x64 22H2 with Office Professional Plus 2019, Chrome 117, Firefox 118, Adobe Reader DC 23, Java 8 Update 381, 7zip 23.01
Number of analysed new started processes analysed:	1
Number of new started drivers analysed:	0
Number of existing processes analysed:	0
Number of existing drivers analysed:	0
Number of injected processes analysed:	0
Technologies:	HCA enabled EGA enabled AMSI enabled
Analysis Mode:	default
Analysis stop reason:	Timeout
Sample name:	service_worker.js
Detection:	MAL
Classification:	mal52.winJS@1/0@0/0
EGA Information:	Failed
HCA Information:	Successful, ratio: 100% Number of executed functions: 0 Number of non-executed functions: 0
Cookbook Comments:	Found application associated with file extension: .js Stop behavior analysis, all processes terminated

Input	Output
URL: email Model: Joe Sandbox AI	{ "risk_score": 1, "reasoning": [ "No headers provided to analyze", "Cannot make security assessment without header information", "Default to low risk score due to lack of evidence" ] }
Date: unknown

File type:	ASCII text, with very long lines (2951), with no line terminators
Entropy (8bit):	5.147620923518026
TrID:
File name:	service_worker.js
File size:	2'951 bytes
MD5:	2972a9c6152c7159fdb8c33a3416d005
SHA1:	718de78402941307ad7d91fbb06841bde79485e3
SHA256:	932354c931c20d823b9a9bb079f0dc075782ace7c14ca8e2dd4ba425fff9402f
SHA512:	79fb07cbc7c9f14c59ab92539594e047f18c8375a26046108c0cb9697ec875827b8220a4e6d5b9dc044000dd4614c48e3a3144a7215125ebe37214d74b5d131c
SSDEEP:	48:dx8Nrcu1dSPXKEaUzmJuRwqQ6F02p95zJT2FgbaJg/V6dRtlBkftBRMJscC2DCMN:Kc06CUzmJvlMjzJCgaJaKJp3CBcl
TLSH:	8151321A624E78371C148F72E52562852E39A2B43832C2297835F5E63B5F44A242FB3E
File Content Preview:	chrome.action.onClicked.addListener((t=>{t.id&&chrome.storage.local.get((i=>{if(i.vbfd_active_windows){const e=i.vbfd_active_windows.find((i=>i.t===t.id));void 0!==e?chrome.windows.update(e.w,{focused:!0}):chrome.windows.create({type:"popup",url:"../popup

File Icon


Icon Hash:	68d69b8bb6aa9a86

Target ID:	0
Start time:	07:18:34
Start date:	16/01/2025
Path:	C:\Windows\System32\wscript.exe
Wow64 process (32bit):	false
Commandline:	C:\Windows\System32\WScript.exe "C:\Users\user\Desktop\service_worker.js"
Imagebase:	0x7ff661700000
File size:	170'496 bytes
MD5 hash:	A47CBE969EA935BDD3AB568BB126BC80
Has elevated privileges:	false
Has administrator privileges:	false
Programmed in:	C, C++ or other language
Reputation:	high
Has exited:	true

Show Windows behavior

Chronological Activities

Disassembly

⊘No disassembly

Description:	This technique has been deprecated. Please use Command and Scripting Interpreter where appropriate.
Tactics:	Defense Evasion, Execution
Data Sources:
Platforms:	Linux, macOS, Windows
Url:	Open detailed description by Mitre

Description:	Adversaries may execute their own malicious payloads by side-loading DLLs. Similar to DLL Search Order Hijacking , side-loading involves hijacking which DLL a program loads. But rather than just planting the DLL within the search order of a program then waiting for the victim application to be invoked, adversaries may directly side-load their payloads by planting then invoking a legitimate application that executes their payload(s).
Tactics:	Defense Evasion, Persistence, Privilege Escalation
Data Sources:	File: File Creation, File: File Modification, Module: Module Load, Process: Process Creation
Platforms:	Windows
Url:	Open detailed description by Mitre

Description:	Adversaries may attempt to make an executable or file difficult to discover or analyze by encrypting, encoding, or otherwise obfuscating its contents on the system or in transit. This is common behavior that can be used across different platforms and the network to evade defenses.
Tactics:	Defense Evasion
Data Sources:	Command: Command Execution, File: File Creation, File: File Metadata, Module: Module Load, Process: OS API Execution, Process: Process Creation, Script: Script Execution, WMI: WMI Creation, Windows Registry: Windows Registry Key Creation
Platforms:	Linux, macOS, Windows
Url:	Open detailed description by Mitre

Description:	An adversary may attempt to get detailed information about the operating system and hardware, including version, patches, hotfixes, service packs, and architecture. Adversaries may use the information from System Information Discovery during automated discovery to shape follow-on behaviors, including whether or not the adversary fully infects the target and/or attempts specific actions.
Tactics:	Discovery
Data Sources:	Command: Command Execution, Process: OS API Execution, Process: Process Creation
Platforms:	IaaS, Linux, macOS, Network, Windows
Url:	Open detailed description by Mitre

Behavior Section

Behavior Chronological

Disassembly

Uncategorized

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Windows Analysis Report service_worker.js

Overview

General Information

Detection

Signatures

Classification

Process Tree

Malware Configuration

Yara Signatures

Sigma Signatures

System Summary

Suricata Signatures

Joe Sandbox Signatures

AV Detection

Networking

System Summary

Hooking and other Techniques for Hiding and Protection

Malware Analysis System Evasion

Anti Debugging

Language, Device and Operating System Detection

Mitre Att&ck Matrix

Behavior Graph

Screenshots

Thumbnails

Antivirus, Machine Learning and Genetic Malware Detection

Initial Sample

Dropped Files

Unpacked PE Files

Domains

URLs

Domains and IPs

Contacted Domains

URLs from Memory and Binaries

World Map of Contacted IPs

General Information

Simulations

Behavior and APIs

LLM Input / Output

Joe Sandbox View / Context

IPs

Domains

ASNs

JA3 Fingerprints

Dropped Files

Created / dropped Files

Static File Info

General

File Icon

Network Behavior

Statistics

CPU Usage

Memory Usage

High Level Behavior Distribution

back

System Behavior

Analysis Process: wscript.exePID: 6908, Parent PID: 2580

General

Chronological Activities

Disassembly

Windows Analysis Report
service_worker.js