🤲🏼 NEW | abuse.ch Community Hub! Earn recognition 🏅 for the malware intelligence you share, climb the leaderboards 📈, and connect with like-minded contributors who share your hunting focus 🤝. Ready to unlock your profile? Go to the Community Hub →

MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 4dc267430fda3c9079763f926f7efdf7cd9c76b63d8e56e0e982107767ef93f0. While MalwareBazaar tries to identify whether the sample provided is malicious or not, there is no guarantee that a sample in MalwareBazaar is malicious.

Database Entry


Formbook


Vendor detections: 10


Intelligence 10 IOCs YARA 1 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: 4dc267430fda3c9079763f926f7efdf7cd9c76b63d8e56e0e982107767ef93f0
SHA3-384 hash: ae29220f9c7c92d8ded9575d70ad74eee8da46a89e693c9b48f986512ce9b9fe60bce626cd7b4ab92d2fb1d79444221e
SHA1 hash: 279fc8948d6cdb32573e35ec01e5539da5b968b2
MD5 hash: f1f57ed140c83fc784dd5676efc1bc8e
humanhash: spring-river-mountain-uniform
File name:ekstre.pdf.js
Download: download sample
Signature Formbook
Create hunting rule
File size:1'900'319 bytes
First seen:2026-09-17 15:04:52 UTC
Last seen:Never
File type:Java Script (JS) js
MIME type:text/plain
ssdeep 24576:C1WvPZcLqB/G0qe5b5ctRlw0TOJrwybz922bkb41KVR0lAxHnP9C/:CgWS//qS5br1H9ZkM/
TLSH T165956D82B7B818579F4EEDD3AEEC025644B80FFB3831821AD99C8D948DDB6F78E04455
Magika txt
Reporter abuse_ch
Tags:FormBook geo js TUR

Intelligence

File Origin
# of uploads :
1
# of downloads :
150
Origin country :
SE SE
Vendor Threat Intelligence
No detections
Verdict:
Malicious
Threat level:
  10/10
Confidence:
100%
Tags:
anti-debug autoit evasive expired-cert fingerprint keylogger masquerade obfuscated obfuscated reconnaissance repaired
Link:
https://www.filescan.io/uploads/6aac01bc7f0fb3ff0c5bcad1/reports/1da76384-b00e-4c2e-ae13-6ea3683a4309/overview
Verdict:
Suspicious
Labled as:
JS/Agent.FAE
Link:
https://www.hybrid-analysis.com/sample/4dc267430fda3c9079763f926f7efdf7cd9c76b63d8e56e0e982107767ef93f0
Verdict:
Malicious
File Type:
js
First seen:
2026-09-17T05:47:00Z UTC
Last seen:
2026-09-17T11:40:00Z UTC
Hits:
~1000
Link:
https://opentip.kaspersky.com/4dc267430fda3c9079763f926f7efdf7cd9c76b63d8e56e0e982107767ef93f0/results?tab=lookup
Result
Threat name:
DonutLoader
Create hunting rule
Detection:
malicious
Classification:
troj.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/1974349
Signature
Detected Windows Script Host debugger hammering
JavaScript file contains suspicious strings
JavaScript source code contains call to eval() to check own source code (likely for evading instrumentation)
JavaScript source code contains functionality to generate code involving a shell, file or stream
JScript performs obfuscated calls to suspicious functions
Malicious sample detected (through community Yara rule)
Sigma detected: Suspicious Parent Double Extension File Execution
Sigma detected: WScript or CScript Dropper
Unusual module load detection (module proxying)
Uses an obfuscated file name to hide its real file extension (double extension)
Windows Scripting host queries suspicious COM object (likely to drop second stage)
WScript reads language and country specific registry keys (likely country aware script)
Yara detected DonutLoader
Behaviour
Behavior Graph:
Download SVG
Score:
90%
Verdict:
Malware
File Type:
SCRIPT
Link:
https://malprob.io/report/4dc267430fda3c9079763f926f7efdf7cd9c76b63d8e56e0e982107767ef93f0
Gathering data
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/4dc267430fda3c9079763f926f7efdf7cd9c76b63d8e56e0e982107767ef93f0/
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=jxbgoqyp3i6ja6lwh6jg67x567gzy5vwhwhfnyhjqiihoz7pspya._file
Verdict:
malicious
Label(s):
DonutLoader
Create hunting rule
Link:
https://reports.threatray.com/9097c568-d93c-4590-a89f-e3e9109d797d
Result
Malware family:
formbook
Create hunting rule
Score:
  10/10
Tags:
family:donutloader family:formbook discovery execution loader persistence ransomware rat spyware stealer trojan
Link:
https://tria.ge/reports/260917-sgg8kssdqe/
Behaviour
Modifies registry class
Suspicious behavior: EnumeratesProcesses
Suspicious use of FindShellTrayWindow
Suspicious use of SendNotifyMessage
Suspicious use of WriteProcessMemory
Uses Task Scheduler COM API
Uses Volume Shadow Copy WMI provider
Uses Volume Shadow Copy service COM API
Command and Scripting Interpreter: JavaScript
Enumerates physical storage devices
System Location Discovery: System Language Discovery
Checks computer location settings
Executes dropped EXE
Detects DonutLoader
Family: DonutLoader
Family: Formbook
Formbook payload
Please note that we are no longer able to provide a coverage score for Virus Total.
Threat name:
Malicious File
Score:
1.00
Link:
https://yomi.yoroi.company/submissions/4dc267430fda3c9079763f926f7efdf7cd9c76b63d8e56e0e982107767ef93f0

YARA Signatures

MalwareBazaar uses YARA rules from several public and non-public repositories, such as YARAhub and Malpedia. Those are being matched against malware samples uploaded to MalwareBazaar as well as against any suspicious process dumps they may create. Please note that only results from TLP:CLEAR rules are being displayed.

Rule name:FreddyBearDropper
Create hunting rule
Author:Dwarozh Hoshiar
Description:Freddy Bear Dropper is dropping a malware through base63 encoded powershell scrip.

File information

The table below shows additional information about this malware sample such as delivery method and external references.

Comments