MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 4231704bcfe9dbaff1e4281e672b804bd9548dd9d765c7a49d6fefdf65fc4f34. 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: 13

Intelligence 13 IOCs YARA 30 File information Comments

SHA256 hash:	4231704bcfe9dbaff1e4281e672b804bd9548dd9d765c7a49d6fefdf65fc4f34
SHA3-384 hash:	c5803458a7912683819ea5d027bd152de6381706ae2ba06319caff78fe087241917a865724af0f61157f61b1d0a3d987
SHA1 hash:	f570bd6ca423cf6000b3fc5b58a2545fb8f4f654
MD5 hash:	8be1d10435f7f57d091c48abb226a8aa
humanhash:	bravo-one-arizona-cardinal
File name:	NPT_VEL_1500_640.js
Download:	download sample
Signature	Formbook Create hunting rule
File size:	2'746'069 bytes
First seen:	2026-11-06 10:57:43 UTC
Last seen:	Never
File type:	js
MIME type:	application/javascript
ssdeep	24576:8fPtAdHLPLaPiuPNcIHz3AljSDSg9UEZV6RTrC969fQkharrt1oLRQb7ksC3PJcj:ggPYw4Hr6I9dxJ7CWoPMQBez4OI8
TLSH	T11FD51257DD056F4F0924064BAD5109137C3AAE0692F4A3E0378E6CFBD34EE5A263F269
Magika	javascript
Reporter	abuse_ch
Tags:	FormBook js

Intelligence

File Origin

# of uploads :

# of downloads :

166

Origin country :

Vendor Threat Intelligence

No detections

Verdict:

Malicious

Score:

96.5%

Link:

https://cyber-fortress.com/docs/result/index.php?id=6aedb2fe1b3e8281a30c96cf

Tags:

proxy java

Result

Verdict:

Malware

Maliciousness:

Behaviour

Creating a window

Creating a file

Creating a process from a recently created file

Launching a process

Sending a custom TCP request

Creating synchronization primitives

Forced shutdown of a system process

Unauthorized injection to a system process

Gathering data

Verdict:

Malicious

Labled as:

JS.FormBook.1.Generic

Link:

https://www.hybrid-analysis.com/sample/4231704bcfe9dbaff1e4281e672b804bd9548dd9d765c7a49d6fefdf65fc4f34

Verdict:

Malicious

File Type:

Link:

https://opentip.kaspersky.com/4231704bcfe9dbaff1e4281e672b804bd9548dd9d765c7a49d6fefdf65fc4f34/results?tab=lookup

Result

Threat name:

FormBook

Detection:

malicious

Classification:

troj.spyw.expl.evad

Score:

100 / 100

Link:

https://www.joesandbox.com/analysis/1999684

Signature

.NET source code contains method to dynamically call methods (often used by packers)

Bypasses PowerShell execution policy

Found direct / indirect Syscall (likely to bypass EDR)

Injects a PE file into a foreign processes

JavaScript file contains Antivirus product strings

JavaScript file contains suspicious strings

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: 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)

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

Verdict:

Malware

YARA:

3 match(es)

Tags:

DeObfuscated PowerShell T1027 T1059.001

Link:

https://app.malva.re/file/8be1d10435f7f57d091c48abb226a8aa

Detection:

n/a

Link:

https://mwdb.cert.pl/sample/4231704bcfe9dbaff1e4281e672b804bd9548dd9d765c7a49d6fefdf65fc4f34/

Threat name:

Script-JS.Backdoor.FormBook

Status:

Malicious

First seen:

2026-11-06 10:58:24 UTC

File Type:

Text (JavaScript)

AV detection:

11 of 38 (28.95%)

Threat level:

5/5

Detection(s):

Suspicious file

Link:

https://check.spamhaus.org/check/?searchterm=iiyxas6p5hn274pefapgok4ajpmvjdoz25s4pje5n7x56zp4j42a._file

Result

Malware family:

formbook

Score:

10/10

Tags:

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

Link:

https://tria.ge/reports/261106-m2xk4scs7j/

Behaviour

Kills process with taskkill

Modifies Internet Explorer settings

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

Suspicious use of SetThreadContext

Accesses Microsoft Outlook profiles

Checks computer location settings

Badlisted process makes network request

Command and Scripting Interpreter: PowerShell

Family: Formbook

Formbook payload

Malware Family:

formbook

Malicious:

True

Tags:

javascript

Link:

https://intel.virussign.com/intelligence/file/4231704bcfe9dbaff1e4281e672b804bd9548dd9d765c7a49d6fefdf65fc4f34

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/4231704bcfe9dbaff1e4281e672b804bd9548dd9d765c7a49d6fefdf65fc4f34

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:	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:	data_manipulation Create hunting rule
Author:	Serhii Kocherhan
Description:	Detects data manipulation routines including XOR encoding, Base64 references, and RC4 PRGA encryption

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:	dgaaga Create hunting rule
Author:	Harshit
Description:	Detects suspicious PowerShell or registry activity

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

Rule name:	exploit_any_poppopret Create hunting rule
Author:	Jeff White [karttoon@gmail.com] @noottrak
Description:	Identify POP -> POP -> RET opcodes for quick ROP Gadget creation in target binaries.

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

Rule name:	INDICATOR_SUSPICIOUS_JS_WMI_ExecQuery Create hunting rule
Author:	ditekSHen
Description:	Detects JS potentially executing WMI queries

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:	SCRIPT_Dropper_Unknown_ForgeAuto_0507f067_Script Create hunting rule
Author:	Marjoriefort
Description:	Detects Unknown (script_js, etat script)

Rule name:	SCRIPT_Dropper_Unknown_ForgeAuto_aaa464f7 Create hunting rule
Author:	Marjoriefort
Description:	Detects Unknown (script_js, etat binaire)

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_Script_PowerShell_Hidden_Launcher Create hunting rule
Author:	Marjoriefort
Description:	Script (JS/VBS) lancant PowerShell en mode furtif - dropper frais MalwareBazaar
Reference:	Veille fraicheur 2026-09-14 / cluster misses web

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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