MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 f4b9eef8e4ca04b9bef203109eab8639641ea0e8ee40e740b8743b436124cac1. 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:	f4b9eef8e4ca04b9bef203109eab8639641ea0e8ee40e740b8743b436124cac1
SHA3-384 hash:	6a0d1a0ba964ba05515565bc807a9bca9064b66d594fa14b4b491d0bbea516b7b9b4e8aa35cf404a179a2bf3a3904a28
SHA1 hash:	c49c5dc04bfa215256159dcd2debc48e816476f9
MD5 hash:	764f979f0cf14703206161d61f6f27e4
humanhash:	six-stream-eight-wyoming
File name:	SECOND.ps1
Download:	download sample
Signature	Formbook Create hunting rule
File size:	1'390'003 bytes
First seen:	2026-01-16 16:14:04 UTC
Last seen:	Never
File type:	ps1
MIME type:	text/plain
ssdeep	24576:77RkZufun+JTaqZ1lV4n73J8qHOlBuVwcX11farJFNPgjpQ9zus:Oal7Z1lVSQBi/fYRYj4
Threatray	2'518 similar samples on MalwareBazaar
TLSH	T15D553304DBD2ADA6026C43BE747AF24D79279643401A68B533DC30CA5F3FBE25A1F598
Magika	powershell
Reporter	abuse_ch
Tags:	FormBook ps1

Intelligence

File Origin

# of uploads :

# of downloads :

Origin country :

Vendor Threat Intelligence

No detections

Verdict:

Malicious

Score:

90.2%

Link:

https://cyber-fortress.com/docs/result/index.php?id=696a63e9ef906a21abcdc5f2

Tags:

ransomware vmdetect spawn

Verdict:

Malicious

Threat level:

10/10

Confidence:

100%

Tags:

anti-vm aspnet_compiler base64 evasive lolbin obfuscated obfuscated powershell reconnaissance

Link:

https://www.filescan.io/uploads/696a63e4584f1963ad575941/reports/5ab14599-3eb2-483a-bc29-7fa7fc8a72fc/overview

Verdict:

Unknown

Link:

https://www.hybrid-analysis.com/sample/f4b9eef8e4ca04b9bef203109eab8639641ea0e8ee40e740b8743b436124cac1

Verdict:

Malicious

File Type:

ps1

First seen:

2026-01-16T01:10:00Z UTC

Last seen:

2026-01-16T13:42:00Z UTC

Hits:

~10

Detections:

PDM:Trojan.Win32.Generic Trojan.Win32.InjectorNetT.s

Link:

https://opentip.kaspersky.com/f4b9eef8e4ca04b9bef203109eab8639641ea0e8ee40e740b8743b436124cac1/results?tab=lookup

Result

Threat name:

FormBook

Detection:

malicious

Classification:

troj.spyw.evad

Score:

100 / 100

Link:

https://www.joesandbox.com/analysis/1852126

Signature

AI detected malicious Powershell script

Injects a PE file into a foreign processes

Joe Sandbox ML detected suspicious sample

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)

Sample uses process hollowing technique

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)

Writes to foreign memory regions

Yara detected FormBook

Yara detected Powershell decode and execute

Behaviour

Behavior Graph:

Download SVG

Score:

98%

Verdict:

Malware

File Type:

SCRIPT

Link:

https://malprob.io/report/f4b9eef8e4ca04b9bef203109eab8639641ea0e8ee40e740b8743b436124cac1

Gathering data

Detection:

n/a

Link:

https://mwdb.cert.pl/sample/f4b9eef8e4ca04b9bef203109eab8639641ea0e8ee40e740b8743b436124cac1/

Verdict:

Malicious

Threat:

Family.FORMBOOK

Link:

https://tip.neiki.dev/file/f4b9eef8e4ca04b9bef203109eab8639641ea0e8ee40e740b8743b436124cac1

Detection(s):

Suspicious file

Link:

https://check.spamhaus.org/check/?searchterm=6s4656hezicltpxsamij5k4ghfsb5ihi5zaooqfyoq5ugyjezlaq._file

Result

Malware family:

formbook

Score:

10/10

Tags:

family:formbook adware discovery execution rat spyware stealer trojan

Link:

https://tria.ge/reports/260116-tpwllshx3g/

Behaviour

Modifies Internet Explorer settings

Suspicious behavior: EnumeratesProcesses

Suspicious behavior: MapViewOfSection

Suspicious use of AdjustPrivilegeToken

Suspicious use of WriteProcessMemory

Command and Scripting Interpreter: PowerShell

System Location Discovery: System Language Discovery

Suspicious use of SetThreadContext

Badlisted process makes network request

Formbook payload

Formbook

Formbook family

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/f4b9eef8e4ca04b9bef203109eab8639641ea0e8ee40e740b8743b436124cac1

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:	detect_powershell Create hunting rule
Author:	daniyyell
Description:	Detects suspicious PowerShell activity related to malware execution

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:	RANSOMWARE Create hunting rule
Author:	ToroGuitar

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:	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/

Rule name:	vmdetect Create hunting rule
Author:	nex
Description:	Possibly employs anti-virtualization techniques

File information

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

Web download

Formbook

ps1 f4b9eef8e4ca04b9bef203109eab8639641ea0e8ee40e740b8743b436124cac1

(this sample)

URLhaus

https://urlhaus.abuse.ch/url/3758271/

Delivery method

Distributed via web download

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