MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 f9990cde4b2caa8c2d2d05d4c62bf7862ffefe51998d74bc0b3ca4772bff479a. 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: 11

Intelligence 11 IOCs YARA 19 File information Comments

SHA256 hash:	f9990cde4b2caa8c2d2d05d4c62bf7862ffefe51998d74bc0b3ca4772bff479a
SHA3-384 hash:	d8e2030337d64170a01f0722a093c701f9dfa2f9c208aebc27b49ab577a7b74cc67547b2ae7ed344a2f4354f7807a702
SHA1 hash:	58c8d4abe36aeb9f385c00b271e9224b89e247cb
MD5 hash:	402cab3cb4f0ea03b5a47b197b562d0b
humanhash:	whiskey-fourteen-ohio-victor
File name:	MM-7953-0053_110_AA SIPARIS 9100052982 .js
Download:	download sample
Signature	Formbook Create hunting rule
File size:	21'605 bytes
First seen:	2026-09-22 15:20:46 UTC
Last seen:	Never
File type:	js
MIME type:	text/plain
ssdeep	384:GThxK60t6oimiXtB7zEfHt3ZkpUu9Y6HJGkQbP66f6iLB6TfFzeRKAqrALEmgWZa:GTho60t6H9XtB78JkpUu9Y6HJG/bPTfS
TLSH	T1BAA2630637E5E88D66F61F7B7A1FB4E1F8D8A85B1D85C88BE540FC642870225EE91730
Magika	javascript
Reporter	abuse_ch
Tags:	FormBook geo js TUR

Intelligence

File Origin

# of uploads :

# of downloads :

146

Origin country :

Vendor Threat Intelligence

No detections

Verdict:

Malicious

Threat level:

10/10

Confidence:

100%

Tags:

encrypted evasive obfuscated powershell repaired

Link:

https://www.filescan.io/uploads/6ab29ce31123096803ea59bf/reports/70cb0645-ea75-4fad-952e-ffcf928e5d81/overview

Verdict:

Malicious

Labled as:

JS/Packed.Agent

Link:

https://www.hybrid-analysis.com/sample/f9990cde4b2caa8c2d2d05d4c62bf7862ffefe51998d74bc0b3ca4772bff479a

Verdict:

Malicious

File Type:

First seen:

2026-09-22T07:26:00Z UTC

Last seen:

2026-09-22T12:25:00Z UTC

Hits:

~10000

Link:

https://opentip.kaspersky.com/f9990cde4b2caa8c2d2d05d4c62bf7862ffefe51998d74bc0b3ca4772bff479a/results?tab=lookup

Result

Threat name:

FormBook

Detection:

malicious

Classification:

troj.spyw.expl.evad

Score:

100 / 100

Link:

https://www.joesandbox.com/analysis/1976254

Signature

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

AI detected malicious Powershell script

Bypasses PowerShell execution policy

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

JavaScript source code contains functionality to generate code involving HTTP requests or file downloads

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: Script Initiated Connection to Non-Local Network

Sigma detected: Suspicious PowerShell Parameter Substring

Sigma detected: WScript or CScript Dropper

Suricata IDS alerts for network traffic

Suspicious execution chain found

Switches to a custom stack to bypass stack traces

System process connects to network (likely due to code injection or exploit)

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 reads language and country specific registry keys (likely country aware script)

Wscript starts Powershell (via cmd or directly)

Yara detected FormBook

Yara detected Generic JS Downloader

Yara detected Powershell decode and execute

Behaviour

Behavior Graph:

Download SVG

Score:

100%

Verdict:

Malware

File Type:

SCRIPT

Link:

https://malprob.io/report/f9990cde4b2caa8c2d2d05d4c62bf7862ffefe51998d74bc0b3ca4772bff479a

Gathering data

Detection:

n/a

Link:

https://mwdb.cert.pl/sample/f9990cde4b2caa8c2d2d05d4c62bf7862ffefe51998d74bc0b3ca4772bff479a/

Threat name:

Script-JS.Trojan.Heuristic

Status:

Malicious

First seen:

2026-09-22 10:38:43 UTC

File Type:

Text (JavaScript)

AV detection:

8 of 36 (22.22%)

Threat level:

2/5

Detection(s):

Suspicious file

Link:

https://check.spamhaus.org/check/?searchterm=7gmqzxslfsviyljnaxkmmk7xqyx757srtggxjpalhsshok77i6na._file

Verdict:

malicious

Label(s):

Formbook

Link:

https://reports.threatray.com/80a84cda-282e-46e8-b0a5-b41c4102e3bd

Result

Malware family:

formbook

Score:

10/10

Tags:

family:formbook adware collection discovery execution rat spyware stealer trojan

Link:

https://tria.ge/reports/260922-srdyxahb95/

Behaviour

Modifies Internet Explorer settings

Suspicious behavior: EnumeratesProcesses

Suspicious behavior: MapViewOfSection

Suspicious use of AdjustPrivilegeToken

Suspicious use of SetWindowsHookEx

Suspicious use of WriteProcessMemory

outlook_office_path

Command and Scripting Interpreter: JavaScript

Command and Scripting Interpreter: PowerShell

Enumerates physical storage devices

System Location Discovery: System Language Discovery

Suspicious use of SetThreadContext

Accesses Microsoft Outlook profiles

Checks computer location settings

Badlisted process makes network request

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/f9990cde4b2caa8c2d2d05d4c62bf7862ffefe51998d74bc0b3ca4772bff479a

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:	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:	Suspicious_Process Create hunting rule
Author:	Security Research Team
Description:	Suspicious process creation

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:	SUSP_obfuscated_JS_obfuscatorio Create hunting rule
Author:	@imp0rtp3
Description:	Detect JS obfuscation done by the js obfuscator (often malicious)
Reference:	https://obfuscator.io

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

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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