MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 537edff805f01933ac0a59f69f5b1acc8ce07c8e1af82da7871e7b7c618e3aef. 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: 12

Intelligence 12 IOCs YARA 25 File information Comments

SHA256 hash:	537edff805f01933ac0a59f69f5b1acc8ce07c8e1af82da7871e7b7c618e3aef
SHA3-384 hash:	56fd49faf6b5ea311a9ecd0eb675ebe8cf5741a04fdfb9cfff33a34faa740bde7b16b67a25e3e0c561ebef1062276a40
SHA1 hash:	075bd0ebd328285a63fc081a80150ef8615c046f
MD5 hash:	84266bb3673ffe13bbaf884c9fa6d4a4
humanhash:	stream-bulldog-winner-one
File name:	order document 4500583468.js
Download:	download sample
Signature	Formbook Create hunting rule
File size:	2'112'536 bytes
First seen:	2026-10-07 18:02:39 UTC
Last seen:	2026-10-14 15:40:17 UTC
File type:	js
MIME type:	text/plain
ssdeep	24576:blum8VDdFvVm4C5bIuiiA2FJh3jZPazZIJaOAIDuZLM3ylhqG/DF:8jO5brX9XjRQwaRCA
TLSH	T17FA5F15089C03EE4DB79561840FD962DE3B10A974C2E694BBB3FFE45AFB790482071A7
Magika	javascript
Reporter	abuse_ch
Tags:	FormBook js

Intelligence

File Origin

# of uploads :

# of downloads :

173

Origin country :

Vendor Threat Intelligence

No detections

Detection(s):

SecuriteInfo.com.JS.Obfus-2303.UNOFFICIAL

Verdict:

Malicious

Score:

99.1%

Link:

https://cyber-fortress.com/docs/result/index.php?id=6ad050216f551121ba15ad5e

Tags:

autorun virus shell blic

Verdict:

Suspicious

Threat level:

5/10

Confidence:

100%

Tags:

base64 encrypted masquerade obfuscated repaired

Link:

https://www.filescan.io/uploads/6ac689741f5cf60711ba4a07/reports/affff829-4ab8-4e4a-bc02-d6ce398e9468/overview

Verdict:

Malicious

Labled as:

GT:JS.Trojan.Downloader.5041

Link:

https://www.hybrid-analysis.com/sample/537edff805f01933ac0a59f69f5b1acc8ce07c8e1af82da7871e7b7c618e3aef

Verdict:

Malicious

File Type:

First seen:

2026-10-07T07:27:00Z UTC

Last seen:

2026-10-09T16:22:00Z UTC

Hits:

~1000

Link:

https://opentip.kaspersky.com/537edff805f01933ac0a59f69f5b1acc8ce07c8e1af82da7871e7b7c618e3aef/results?tab=lookup

Result

Threat name:

FormBook

Detection:

malicious

Classification:

troj.spyw.expl.evad

Score:

100 / 100

Link:

https://www.joesandbox.com/analysis/1983758

Signature

Bypasses PowerShell execution policy

Creates autostart registry keys with suspicious values (likely registry only malware)

Found direct / indirect Syscall (likely to bypass EDR)

Injects a PE file into a foreign processes

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)

Maps a DLL or memory area into another process

Modifies the context of a thread in another process (thread injection)

Multi AV Scanner detection for submitted file

Queues an APC in another process (thread injection)

Sigma detected: New RUN Key Pointing to Suspicious Folder

Sigma detected: WScript or CScript Dropper

Suricata IDS alerts for network traffic

Suspicious execution chain found

Suspicious powershell command line found

Switches to a custom stack to bypass stack traces

Tries to harvest and steal browser information (history, passwords, etc)

Tries to steal Mail credentials (via file / registry access)

Unusual module load detection (module proxying)

Windows Scripting host queries suspicious COM object (likely to drop second stage)

Windows shortcut file (LNK) contains suspicious command line arguments

Writes to foreign memory regions

Wscript starts Powershell (via cmd or directly)

Yara detected FormBook

Yara detected Powershell decode and execute

Behaviour

Behavior Graph:

Download SVG

Score:

99%

Verdict:

Malware

File Type:

SCRIPT

Link:

https://malprob.io/report/537edff805f01933ac0a59f69f5b1acc8ce07c8e1af82da7871e7b7c618e3aef

Gathering data

Detection:

n/a

Link:

https://mwdb.cert.pl/sample/537edff805f01933ac0a59f69f5b1acc8ce07c8e1af82da7871e7b7c618e3aef/

Threat name:

Script-JS.Backdoor.FormBook

Status:

Malicious

First seen:

2026-10-07 12:55:06 UTC

File Type:

Text (JavaScript)

AV detection:

14 of 38 (36.84%)

Threat level:

5/5

Detection(s):

Suspicious file

Link:

https://check.spamhaus.org/check/?searchterm=kn7n76af6amthlaklh3j6wy2zsgoa7eodl4c3j4hdz5xyymohlxq._file

Result

Malware family:

formbook

Score:

10/10

Tags:

family:formbook adware collection defense_evasion discovery execution persistence privilege_escalation rat spyware stealer trojan

Link:

https://tria.ge/reports/261007-wm93bsdx4p/

Behaviour

Modifies Internet Explorer settings

Modifies registry class

Suspicious behavior: EnumeratesProcesses

Suspicious behavior: MapViewOfSection

Suspicious use of AdjustPrivilegeToken

Suspicious use of WriteProcessMemory

outlook_office_path

Command and Scripting Interpreter: JavaScript

Enumerates physical storage devices

Reads the TCP/IP host and domain name from the registry

System Location Discovery: System Language Discovery

ConfuserEx .NET packer

Suspicious use of SetThreadContext

Accesses Microsoft Outlook profiles

Adds Run key to start application

Creates a file in the Startup directory

Badlisted process makes network request

Command and Scripting Interpreter: PowerShell

Family: Formbook

Formbook payload

Malware family:

FormBook

Verdict:

Malicious

Link:

https://www.vmray.com/analyses/_mb/537edff805f0/report/overview.html

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/537edff805f01933ac0a59f69f5b1acc8ce07c8e1af82da7871e7b7c618e3aef

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:	Base64_Encoded_Powershell_Directives Create hunting rule

Rule name:	CP_Script_Inject_Detector Create hunting rule
Author:	DiegoAnalytics
Description:	Detects attempts to inject code into another process across PE, ELF, Mach-O binaries

Rule name:	DebuggerCheck__GlobalFlags Create hunting rule
Reference:	https://github.com/naxonez/yaraRules/blob/master/AntiDebugging.yara

Rule name:	DebuggerCheck__QueryInfo Create hunting rule
Reference:	https://github.com/naxonez/yaraRules/blob/master/AntiDebugging.yara

Rule name:	DebuggerHiding__Active Create hunting rule
Reference:	https://github.com/naxonez/yaraRules/blob/master/AntiDebugging.yara

Rule name:	DebuggerHiding__Thread Create hunting rule
Reference:	https://github.com/naxonez/yaraRules/blob/master/AntiDebugging.yara

Rule name:	DetectEncryptedVariants Create hunting rule
Author:	Zinyth
Description:	Detects 'encrypted' in ASCII, Unicode, base64, or hex-encoded

Rule name:	dgaagas Create hunting rule
Author:	Harshit
Description:	Uses certutil.exe to download a file named test.txt

Rule name:	golang_bin_JCorn_CSC846 Create hunting rule
Author:	Justin Cornwell
Description:	CSC-846 Golang detection ruleset

Rule name:	MD5_Constants Create hunting rule
Author:	phoul (@phoul)
Description:	Look for MD5 constants

Rule name:	pe_no_import_table Create hunting rule
Description:	Detect pe file that no import table

Rule name:	RIPEMD160_Constants Create hunting rule
Author:	phoul (@phoul)
Description:	Look for RIPEMD-160 constants

Rule name:	SEH__vectored Create hunting rule
Reference:	https://github.com/naxonez/yaraRules/blob/master/AntiDebugging.yara

Rule name:	SHA1_Constants Create hunting rule
Author:	phoul (@phoul)
Description:	Look for SHA1 constants

Rule name:	shellcode Create hunting rule
Author:	nex
Description:	Matched shellcode byte patterns

Rule name:	SUSP_JS_HexObfuscated_ActiveX_Launcher Create hunting rule
Author:	Marjoriefort
Description:	JS obfusque (identifiants _0x) instanciant ActiveX sous WScript - dropper JScript frais
Reference:	Veille fraicheur 2026-09-14 / cluster JS _0x

Rule name:	Sus_CMD_Powershell_Usage Create hunting rule
Author:	XiAnzheng
Description:	May Contain(Obfuscated or no) Powershell or CMD Command that can be abused by threat actor(can create FP)

Rule name:	telebot_framework Create hunting rule
Author:	vietdx.mb

Rule name:	TH_Win_ETW_Bypass_2025_CYFARE Create hunting rule
Author:	CYFARE
Description:	Windows ETW Bypass Detection Rule - 2025
Reference:	https://cyfare.net/

Rule name:	WIN_Malware_SalatStealer_ForgeAuto_542e717b Create hunting rule
Author:	Marjoriefort
Description:	Detects SalatStealer (pe, etat binaire)

Rule name:	WIN_Malware_Sliver_ForgeAuto_2ddb463c Create hunting rule
Author:	Marjoriefort
Description:	Detects Sliver (pe, etat binaire)

Rule name:	WIN_Malware_Unknown_ForgeAuto_2ffc3572 Create hunting rule
Author:	Marjoriefort
Description:	Detects Unknown (pe, etat binaire)

Rule name:	WIN_Malware_Unknown_ForgeAuto_5001c94c Create hunting rule
Author:	Marjoriefort
Description:	Detects Unknown (pe, etat binaire)

Rule name:	WIN_Malware_Unknown_ForgeAuto_ce8c5b46 Create hunting rule
Author:	Marjoriefort
Description:	Detects Unknown (pe, etat binaire)

Rule name:	WIN_Malware_ValleyRAT_ForgeAuto_401c5e16 Create hunting rule
Author:	Marjoriefort
Description:	Detects ValleyRAT (pe, etat binaire)

File information

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

No further information available

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