MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 21f54a9d180619b9656ad19add4bb8065d05793e8248e8a7eec97da545e579a9. 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: 9


Intelligence 9 IOCs YARA 23 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: 21f54a9d180619b9656ad19add4bb8065d05793e8248e8a7eec97da545e579a9
SHA3-384 hash: 2c97b43419a8c26d8188e749574b586f2aa0ce7ede3541f846ddbbbfdf8271392e9d5c85bea3f7ac95ef96401a114120
SHA1 hash: d89e379083c935e7f41d5e815376d4dba64d52be
MD5 hash: 0f3894cf979a46d77336baa6003aec15
humanhash: rugby-juliet-nevada-mobile
File name:crypted.ps1
Download: download sample
Signature Formbook
Create hunting rule
File size:2'246'466 bytes
First seen:2026-08-19 18:39:45 UTC
Last seen:Never
File type:PowerShell (PS) ps1
MIME type:text/plain
ssdeep 24576:Z6DF/FDxS8LuQmnF/08q0p/KJ9cHuaekj/J8w13pLNZsz7/cAknG7RBTunK7tWAy:L
TLSH T130A5883DD380B96E9B3DC7E2887A29EC1761F567A05B205CC722EA9710E6166FFC0D11
Magika powershell
Reporter abuse_ch
Tags:FormBook ps1

Intelligence

File Origin
# of uploads :
1
# of downloads :
67
Origin country :
SE SE
Vendor Threat Intelligence
No detections
Verdict:
Malicious
Threat level:
  10/10
Confidence:
100%
Tags:
aspnet_compiler base64 base64 encrypted evasive lolbin obfuscated reconnaissance
Link:
https://www.filescan.io/uploads/6a85f8a4f60d2a71176169e6/reports/4a61a373-3ba5-4295-811d-3c7ffae0115c/overview
Verdict:
Malicious
Labled as:
PowerShell/Agent.EZS trojan
Link:
https://www.hybrid-analysis.com/sample/21f54a9d180619b9656ad19add4bb8065d05793e8248e8a7eec97da545e579a9
Result
Threat name:
FormBook
Create hunting rule
Detection:
malicious
Classification:
troj.spyw.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/1960685
Signature
.NET source code contains method to dynamically call methods (often used by packers)
AI detected malicious Powershell script
Antivirus detection for URL or domain
Found direct / indirect Syscall (likely to bypass EDR)
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)
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
behaviorgraph top1 dnsIp2 2 Behavior Graph ID: 1960685 Sample: crypted.ps1 Startdate: 19/08/2026 Architecture: WINDOWS Score: 100 34 www500500.com 2->34 36 www.uneivo.com 2->36 38 18 other IPs or domains 2->38 46 Malicious sample detected (through community Yara rule) 2->46 48 Antivirus detection for URL or domain 2->48 50 Multi AV Scanner detection for submitted file 2->50 52 6 other signatures 2->52 10 powershell.exe 20 2->10         started        signatures3 process4 signatures5 54 Writes to foreign memory regions 10->54 56 Injects a PE file into a foreign processes 10->56 13 aspnet_compiler.exe 10->13         started        16 aspnet_compiler.exe 10->16         started        18 MpCmdRun.exe 1 10->18         started        20 27 other processes 10->20 process6 signatures7 66 Modifies the context of a thread in another process (thread injection) 13->66 68 Maps a DLL or memory area into another process 13->68 70 Queues an APC in another process (thread injection) 13->70 72 Found direct / indirect Syscall (likely to bypass EDR) 13->72 22 wsvbS6UC.exe 13->22 injected 74 Unusual module load detection (module proxying) 16->74 76 Switches to a custom stack to bypass stack traces 16->76 24 conhost.exe 18->24         started        process8 process9 26 xcopy.exe 13 22->26         started        signatures10 58 Tries to steal Mail credentials (via file / registry access) 26->58 60 Tries to harvest and steal browser information (history, passwords, etc) 26->60 62 Modifies the context of a thread in another process (thread injection) 26->62 64 3 other signatures 26->64 29 gtkWC9SaXi0wgP.exe 26->29 injected 32 firefox.exe 26->32         started        process11 dnsIp12 40 parking.d.parity.domains 2.59.170.19, 49779, 49780, 49781 WORLDSTREAMNL Netherlands 29->40 42 www.qnch.com 177.3.34.126, 49743, 49744, 49745 VtalBR United States 29->42 44 12 other IPs or domains 29->44
Score:
88%
Verdict:
Malware
File Type:
SCRIPT
Link:
https://malprob.io/report/21f54a9d180619b9656ad19add4bb8065d05793e8248e8a7eec97da545e579a9
Gathering data
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/21f54a9d180619b9656ad19add4bb8065d05793e8248e8a7eec97da545e579a9/
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=eh2uvhiyaym3szlk2gnn2s5yazoqk6j6qjeorj7ozf62krpfpguq._file
Verdict:
malicious
Label(s):
Formbook
Create hunting rule
Link:
https://reports.threatray.com/2e013b51-e834-452a-a826-07001fa7dcba
Result
Malware family:
formbook
Create hunting rule
Score:
  10/10
Tags:
family:formbook adware collection discovery execution rat spyware stealer trojan
Link:
https://tria.ge/reports/260819-xbhpda1arc/
Behaviour
Enumerates system info in registry
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: PowerShell
System Location Discovery: System Language Discovery
Suspicious use of SetThreadContext
Accesses Microsoft Outlook profiles
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/21f54a9d180619b9656ad19add4bb8065d05793e8248e8a7eec97da545e579a9

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: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/

File information

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

Web download

Formbook

PowerShell (PS) ps1 21f54a9d180619b9656ad19add4bb8065d05793e8248e8a7eec97da545e579a9

(this sample)

  
URLhaus
https://urlhaus.abuse.ch/url/3896911/
  
Delivery method
Distributed via web download

Comments