MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 3671a3f885f39f3793f4c88e8a54005b466e1e9b20f2a91d069cea42e25703b3. 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 17 File information Comments

SHA256 hash:	3671a3f885f39f3793f4c88e8a54005b466e1e9b20f2a91d069cea42e25703b3
SHA3-384 hash:	5ae8a6241d1fd45e200a869f5660301b9615227417d9515575aeaf7d6b3e16f119b60d0421ce7d045c1432a2400beaa2
SHA1 hash:	a814e53ee8f9fbe2adbd23e77d2c0b0798ce6453
MD5 hash:	139cf5ba35663fdabcde815c1b7f63d6
humanhash:	seven-one-snake-earth
File name:	Encrypted_Script.ps1
Download:	download sample
Signature	Formbook Create hunting rule
File size:	1'368'271 bytes
First seen:	2025-12-04 21:01:47 UTC
Last seen:	Never
File type:	ps1
MIME type:	text/plain
ssdeep	24576:DcJRM+y/3nDB4ZNH0XZrs+rFbiIQL2ddPiNHGlJvakgvEXklkzBcy:Dcund4DAd/TKNCik0lPy
Threatray	2'266 similar samples on MalwareBazaar
TLSH	T1EF553341FED44E8A082CE15C783B2E054ED26B95805E617BBBE456E37A8E30F7227853
Magika	powershell
Reporter	abuse_ch
Tags:	FormBook ps1

Intelligence

File Origin

# of uploads :

# of downloads :

101

Origin country :

Vendor Threat Intelligence

No detections

Detection(s):

SecuriteInfo.com.Other.Malware-gen.27278696.UNOFFICIAL

Verdict:

Malicious

Score:

94.9%

Link:

https://cyber-fortress.com/docs/result/index.php?id=6931f6ea221589dfd96c1c5a

Tags:

ransomware virus shell

Verdict:

Malicious

Threat level:

10/10

Confidence:

100%

Tags:

aspnet_compiler base64 evasive lolbin obfuscated obfuscated powershell reconnaissance zusy

Link:

https://www.filescan.io/uploads/6931f6e1d12d1c79d4295d82/reports/10ebe46e-afbf-4786-a13e-fe4419319962/overview

Verdict:

Malicious

Labled as:

Trojan.Generic

Link:

https://www.hybrid-analysis.com/sample/3671a3f885f39f3793f4c88e8a54005b466e1e9b20f2a91d069cea42e25703b3

Verdict:

Malicious

File Type:

ps1

First seen:

2025-12-01T02:14:00Z UTC

Last seen:

2025-12-04T18:18:00Z UTC

Hits:

~10

Detections:

Trojan.Win32.InjectorNetT.s Trojan.Win32.Agent.sb PDM:Trojan.Win32.Generic Trojan-Spy.Win32.Noon.sb

Link:

https://opentip.kaspersky.com/3671a3f885f39f3793f4c88e8a54005b466e1e9b20f2a91d069cea42e25703b3/results?tab=lookup

Result

Threat name:

FormBook

Detection:

malicious

Classification:

troj.spyw.evad

Score:

100 / 100

Link:

https://www.joesandbox.com/analysis/1826800

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)

Performs DNS queries to domains with low reputation

Queues an APC in another process (thread injection)

Suricata IDS alerts for network traffic

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)

Uses ping.exe to check the status of other devices and networks

Writes to foreign memory regions

Yara detected FormBook

Yara detected MSILLoadEncryptedAssembly

Yara detected Powershell decode and execute

Behaviour

Behavior Graph:

Download SVG

Score:

99%

Verdict:

Malware

File Type:

SCRIPT

Link:

https://malprob.io/report/3671a3f885f39f3793f4c88e8a54005b466e1e9b20f2a91d069cea42e25703b3

Verdict:

inconclusive

YARA:

1 match(es)

Tags:

Base64 Block Contains Base64 Block PowerShell

Link:

https://app.malva.re/file/139cf5ba35663fdabcde815c1b7f63d6

Detection:

n/a

Link:

https://mwdb.cert.pl/sample/3671a3f885f39f3793f4c88e8a54005b466e1e9b20f2a91d069cea42e25703b3/

Verdict:

Malicious

Threat:

Family.FORMBOOK

Link:

https://tip.neiki.dev/file/3671a3f885f39f3793f4c88e8a54005b466e1e9b20f2a91d069cea42e25703b3

Threat name:

Script-PowerShell.Trojan.Heuristic

Status:

Malicious

First seen:

2025-12-01 04:37:01 UTC

File Type:

Text (PowerShell)

AV detection:

9 of 36 (25.00%)

Threat level:

2/5

Detection(s):

Suspicious file

Link:

https://check.spamhaus.org/check/?searchterm=gzy2h6ef6optpe7uzchiuvaalndg4hu3edzkshigttvefysxaozq._file

Verdict:

malicious

Label(s):

formbook

Result

Malware family:

formbook

Score:

10/10

Tags:

family:formbook adware discovery execution rat spyware stealer trojan

Link:

https://tria.ge/reports/251204-zvmtjstnd1/

Behaviour

Modifies Internet Explorer settings

Runs ping.exe

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

System Network Configuration Discovery: Internet Connection 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:

Formbook

Score:

1.00

Link:

https://yomi.yoroi.company/submissions/3671a3f885f39f3793f4c88e8a54005b466e1e9b20f2a91d069cea42e25703b3

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:	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/

File information

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

Web download

Formbook

ps1 3671a3f885f39f3793f4c88e8a54005b466e1e9b20f2a91d069cea42e25703b3

(this sample)

URLhaus

https://urlhaus.abuse.ch/url/3724437/

Delivery method

Distributed via web download

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