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MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 4f38dfef0fbfcf48621a989761d9be58f2c814791438c4ceccdabdfa43da12ee. 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: 10


Intelligence 10 IOCs YARA 22 File information Comments
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SHA256 hash: 4f38dfef0fbfcf48621a989761d9be58f2c814791438c4ceccdabdfa43da12ee
SHA3-384 hash: 0b95f28607ff06dae21d182422df75f3d48617de9f9f215dc0821428d51006bbba92c81c4e1a15493483c8b33e50b921
SHA1 hash: f589e2a18ec80518d90eeffd6a44caef2e1f5b04
MD5 hash: 014a7a02d0d0670b89c6e5bcfd5b1f47
humanhash: kentucky-cold-kilo-don
File name:PO - DONZA4179.JS
Download: download sample
Signature Formbook
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File size:3'863'903 bytes
First seen:2026-10-08 09:35:36 UTC
Last seen:Never
File type:Java Script (JS) js
MIME type:application/javascript
ssdeep 98304:8tj7sU5dRgqIsKrXv4DBk/2qqlBHL8ZCsADLmw6gzcYPnztnwVUnbpyj0jH8K:S7r/7KcDjbHHnmx8Pvnbpx5
TLSH T15B06E5BC0382A1C2DF68E637C7C5A99AD1091CA7BF005AA136EFF5ED9745D803766D80
Magika c
Reporter abuse_ch
Tags:FormBook js

Intelligence

File Origin
# of uploads :
1
# of downloads :
160
Origin country :
SE SE
Vendor Threat Intelligence
No detections
Detection(s):
SecuriteInfo.com.Trojan.JS.Agent.89.25293.UNOFFICIAL
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Verdict:
Malicious
Threat level:
  10/10
Confidence:
100%
Tags:
anti-debug dropper evasive obfuscated obfuscated packed repaired
Link:
https://www.filescan.io/uploads/6ac76412239dbaf8937bdcc7/reports/a9da077c-002a-42f4-8b70-69765454a3cb/overview
Verdict:
Suspicious
Labled as:
JS/Agent.ECX2
Link:
https://www.hybrid-analysis.com/sample/4f38dfef0fbfcf48621a989761d9be58f2c814791438c4ceccdabdfa43da12ee
Verdict:
Malicious
File Type:
js
First seen:
2026-10-08T05:23:00Z UTC
Last seen:
2026-10-09T07:37:00Z UTC
Hits:
~1000
Link:
https://opentip.kaspersky.com/4f38dfef0fbfcf48621a989761d9be58f2c814791438c4ceccdabdfa43da12ee/results?tab=lookup
Result
Threat name:
FormBook
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Detection:
malicious
Classification:
troj.spyw.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/1984096
Signature
Found API chain indicative of debugger detection
Found direct / indirect Syscall (likely to bypass EDR)
JavaScript source code contains call to eval() to check own source code (likely for evading instrumentation)
JavaScript source code contains functionality to generate code involving a shell, file or stream
Maps a DLL or memory area into another process
Modifies the context of a thread in another process (thread injection)
Queues an APC in another process (thread injection)
Sigma detected: Invoke-Obfuscation CLIP+ Launcher
Sigma detected: Invoke-Obfuscation VAR+ Launcher
Sigma detected: Suspicious Command Patterns In Scheduled Task Creation
Sigma detected: WScript or CScript Dropper
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 ipconfig to lookup or modify the Windows network settings
Uses schtasks.exe or at.exe to add and modify task schedules
Uses whoami command line tool to query computer and username
Windows Scripting host queries suspicious COM object (likely to drop second stage)
WScript reads language and country specific registry keys (likely country aware script)
Yara detected FormBook
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 dnsIp2 2 Behavior Graph ID: 1984096 Sample: PO - DONZA4179.JS.js Startdate: 08/10/2026 Architecture: WINDOWS Score: 100 72 www.familytrip.best 2->72 74 www.semporaviona.world 2->74 76 4 other IPs or domains 2->76 88 Suricata IDS alerts for network traffic 2->88 90 Yara detected FormBook 2->90 92 JavaScript source code contains functionality to generate code involving a shell, file or stream 2->92 94 7 other signatures 2->94 10 wscript.exe 1 4 2->10         started        13 WuTDCmx2WcDZn5.exe 2->13 injected 15 cmd.exe 1 4 2->15         started        17 2 other processes 2->17 signatures3 process4 dnsIp5 112 Windows Scripting host queries suspicious COM object (likely to drop second stage) 10->112 114 WScript reads language and country specific registry keys (likely country aware script) 10->114 20 DIRNHTZKTFAKMKYT.exe 3 10->20         started        116 Maps a DLL or memory area into another process 13->116 118 Found direct / indirect Syscall (likely to bypass EDR) 13->118 24 ipconfig.exe 13 13->24         started        26 cmd.exe 1 15->26         started        28 conhost.exe 15->28         started        66 www.familytrip.best 172.67.151.251, 49713, 80 CLOUDFLARENET-CloudflareIncUS Canada 17->66 68 pmbikes.net 185.80.2.62, 80 SUPERHOSTING_ASBG Bulgaria 17->68 70 latanadelriccio.net 86.107.37.78, 80 SERVERPLAN-ASIT Italy 17->70 30 ipconfig.exe 17->30         started        signatures6 process7 file8 64 C:\Users\user\...\TYKMKAFTKZTHNRID.url, MS 20->64 dropped 96 Found API chain indicative of debugger detection 20->96 98 Modifies the context of a thread in another process (thread injection) 20->98 100 Maps a DLL or memory area into another process 20->100 108 3 other signatures 20->108 32 cmd.exe 1 20->32         started        35 cmd.exe 1 20->35         started        37 cmd.exe 1 20->37         started        39 conhost.exe 20->39         started        102 Tries to steal Mail credentials (via file / registry access) 24->102 104 Tries to harvest and steal browser information (history, passwords, etc) 24->104 106 Unusual module load detection (module proxying) 24->106 41 firefox.exe 24->41         started        43 DIRNHTZKTFAKMKYT.exe 1 26->43         started        45 conhost.exe 26->45         started        signatures9 process10 signatures11 78 Uses schtasks.exe or at.exe to add and modify task schedules 32->78 80 Uses whoami command line tool to query computer and username 32->80 47 whoami.exe 1 32->47         started        49 schtasks.exe 1 35->49         started        51 schtasks.exe 1 37->51         started        82 Modifies the context of a thread in another process (thread injection) 43->82 84 Maps a DLL or memory area into another process 43->84 86 Found direct / indirect Syscall (likely to bypass EDR) 43->86 53 cmd.exe 1 43->53         started        56 cmd.exe 1 43->56         started        58 conhost.exe 43->58         started        process12 signatures13 110 Uses whoami command line tool to query computer and username 53->110 60 whoami.exe 1 53->60         started        62 schtasks.exe 1 56->62         started        process14
Score:
99%
Verdict:
Malware
File Type:
SCRIPT
Link:
https://malprob.io/report/4f38dfef0fbfcf48621a989761d9be58f2c814791438c4ceccdabdfa43da12ee
Gathering data
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/4f38dfef0fbfcf48621a989761d9be58f2c814791438c4ceccdabdfa43da12ee/
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=j44n73ypx7huqyq2tclwdwn6ldzmqfdzcq4mjtwm3k67uq62clxa._file
Verdict:
malicious
Label(s):
Formbook
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Link:
https://reports.threatray.com/47bd4e85-a16e-4fa0-929e-b79462ea99e6
Result
Malware family:
formbook
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Score:
  10/10
Tags:
family:formbook defense_evasion discovery execution persistence privilege_escalation rat spyware stealer trojan
Link:
https://tria.ge/reports/261008-lk2ytses3x/
Behaviour
Modifies registry class
Scheduled Task/Job: Scheduled Task
Suspicious behavior: EnumeratesProcesses
Suspicious behavior: MapViewOfSection
Suspicious use of AdjustPrivilegeToken
Suspicious use of WriteProcessMemory
Command and Scripting Interpreter: JavaScript
Enumerates physical storage devices
Executes a command shell one-liner
System Location Discovery: System Language Discovery
Suspicious use of SetThreadContext
Checks computer location settings
Executes dropped EXE
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/4f38dfef0fbfcf48621a989761d9be58f2c814791438c4ceccdabdfa43da12ee

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
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Author:DiegoAnalytics
Description:Detects attempts to inject code into another process across PE, ELF, Mach-O binaries
Rule name:DebuggerCheck__GlobalFlags
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Reference:https://github.com/naxonez/yaraRules/blob/master/AntiDebugging.yara
Rule name:DebuggerCheck__QueryInfo
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Reference:https://github.com/naxonez/yaraRules/blob/master/AntiDebugging.yara
Rule name:DebuggerHiding__Active
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Reference:https://github.com/naxonez/yaraRules/blob/master/AntiDebugging.yara
Rule name:DebuggerHiding__Thread
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Reference:https://github.com/naxonez/yaraRules/blob/master/AntiDebugging.yara
Rule name:DetectEncryptedVariants
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Author:Zinyth
Description:Detects 'encrypted' in ASCII, Unicode, base64, or hex-encoded
Rule name:dgaagas
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Author:Harshit
Description:Uses certutil.exe to download a file named test.txt
Rule name:golang_bin_JCorn_CSC846
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Author:Justin Cornwell
Description:CSC-846 Golang detection ruleset
Rule name:MD5_Constants
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Author:phoul (@phoul)
Description:Look for MD5 constants
Rule name:MULTI_Malware_AgentTesla_ForgeAuto_ed343f78_Extrait
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Author:Marjoriefort
Description:Detects AgentTesla (inconnu, etat extrait)
Rule name:pe_no_import_table
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Description:Detect pe file that no import table
Rule name:RIPEMD160_Constants
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Author:phoul (@phoul)
Description:Look for RIPEMD-160 constants
Rule name:SEH__vectored
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Reference:https://github.com/naxonez/yaraRules/blob/master/AntiDebugging.yara
Rule name:SHA1_Constants
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Author:phoul (@phoul)
Description:Look for SHA1 constants
Rule name:shellcode
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Author:nex
Description:Matched shellcode byte patterns
Rule name:TH_Win_ETW_Bypass_2025_CYFARE
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Author:CYFARE
Description:Windows ETW Bypass Detection Rule - 2025
Reference:https://cyfare.net/
Rule name:WIN_Malware_SalatStealer_ForgeAuto_542e717b
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Author:Marjoriefort
Description:Detects SalatStealer (pe, etat binaire)
Rule name:WIN_Malware_Sliver_ForgeAuto_2ddb463c
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Author:Marjoriefort
Description:Detects Sliver (pe, etat binaire)
Rule name:WIN_Malware_Unknown_ForgeAuto_2ffc3572
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Author:Marjoriefort
Description:Detects Unknown (pe, etat binaire)
Rule name:WIN_Malware_Unknown_ForgeAuto_5001c94c
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Author:Marjoriefort
Description:Detects Unknown (pe, etat binaire)
Rule name:WIN_Malware_Unknown_ForgeAuto_ce8c5b46
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Author:Marjoriefort
Description:Detects Unknown (pe, etat binaire)
Rule name:WIN_Malware_ValleyRAT_ForgeAuto_401c5e16
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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.

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