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MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 ff839798f00b8d75e0123ddd92b67a8f6f450b261c6b5181cff0c4159e618b09. 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 1 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: ff839798f00b8d75e0123ddd92b67a8f6f450b261c6b5181cff0c4159e618b09
SHA3-384 hash: 01735df3450a4e3318ed55c68e179fdc93dfde6d56130cea42c9b0a79cac06d1bacfa0998511c6dc6fe49e98a133a73d
SHA1 hash: 365baea8064420e4a5b1972929a65864302c5a2d
MD5 hash: 4e1f6b054e139a8a7a5c77ee22ff96cd
humanhash: kentucky-seventeen-nuts-moon
File name:Confirmación de pago de Santander 31.07.26.js
Download: download sample
Signature Formbook
Create hunting rule
File size:6'321'872 bytes
First seen:2026-07-31 12:24:46 UTC
Last seen:Never
File type:Java Script (JS) js
MIME type:text/plain
ssdeep 12288:iStRZRRl2C/RrcorUcGq/6cdRVHcfidzKk1u9pPSh0UIqc4fsWp1Nu7kWegP6G0Z:iS9l2NogcRlMxS9l2NogcRlR
TLSH T1D756B8A536DE294B5A023713A9845D598F75C4253F9377E4F0DF03881A1F8CA2E8CA6F
Magika javascript
Reporter lowmal3
Tags:FormBook js

Intelligence

File Origin
# of uploads :
1
# of downloads :
160
Origin country :
DE DE
Vendor Threat Intelligence
No detections
Verdict:
Malicious
Threat level:
  10/10
Confidence:
100%
Tags:
agenttesla anti-vm aspnet_compiler base64 base64 cscript downloader encrypted evasive evasive fingerprint lolbin obfuscated obfuscated powershell reconnaissance repaired taskkill wscript
Link:
https://www.filescan.io/uploads/6a6c944619e2865c1e9037c0/reports/ed05bfc4-1fd7-4745-9668-daf1fd09a16c/overview
Verdict:
Malicious
Labled as:
GT:JS.AgentTesla.666
Link:
https://www.hybrid-analysis.com/sample/ff839798f00b8d75e0123ddd92b67a8f6f450b261c6b5181cff0c4159e618b09
Verdict:
Malicious
File Type:
js
First seen:
2026-07-31T06:12:00Z UTC
Last seen:
2026-08-02T09:30:00Z UTC
Hits:
~1000
Link:
https://opentip.kaspersky.com/ff839798f00b8d75e0123ddd92b67a8f6f450b261c6b5181cff0c4159e618b09/results?tab=lookup
Result
Threat name:
FormBook
Create hunting rule
Detection:
malicious
Classification:
troj.spyw.expl.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/1950597
Signature
.NET source code contains method to dynamically call methods (often used by packers)
Antivirus detection for URL or domain
Binary is likely a compiled AutoIt script file
Bypasses PowerShell execution policy
Found direct / indirect Syscall (likely to bypass EDR)
Injects a PE file into a foreign processes
JavaScript file contains suspicious strings
JavaScript source code contains functionality to generate code involving a shell, file or stream
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
Performs DNS queries to domains with low reputation
Queues an APC in another process (thread injection)
Sigma detected: WScript or CScript Dropper
Suspicious execution chain found
Suspicious powershell command line found
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)
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 Powershell decode and execute
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 dnsIp2 2 Behavior Graph ID: 1950597 Sample: Confirmaci#U00f3n de pago d... Startdate: 31/07/2026 Architecture: WINDOWS Score: 100 42 www.quantrai.xyz 2->42 44 www.teamswanborn.nl 2->44 46 7 other IPs or domains 2->46 62 Malicious sample detected (through community Yara rule) 2->62 64 Antivirus detection for URL or domain 2->64 66 Multi AV Scanner detection for submitted file 2->66 70 7 other signatures 2->70 11 wscript.exe 3 2->11         started        signatures3 68 Performs DNS queries to domains with low reputation 42->68 process4 signatures5 86 Suspicious powershell command line found 11->86 88 Wscript starts Powershell (via cmd or directly) 11->88 90 Bypasses PowerShell execution policy 11->90 92 3 other signatures 11->92 14 powershell.exe 16 11->14         started        17 taskkill.exe 1 11->17         started        process6 signatures7 94 Writes to foreign memory regions 14->94 96 Injects a PE file into a foreign processes 14->96 19 aspnet_compiler.exe 14->19         started        22 aspnet_compiler.exe 14->22         started        24 conhost.exe 14->24         started        28 20 other processes 14->28 26 conhost.exe 17->26         started        process8 signatures9 72 Modifies the context of a thread in another process (thread injection) 19->72 74 Maps a DLL or memory area into another process 19->74 76 Queues an APC in another process (thread injection) 19->76 78 Found direct / indirect Syscall (likely to bypass EDR) 19->78 30 5RwkOOAYhpRP.exe 19->30 injected 80 Unusual module load detection (module proxying) 22->80 82 Switches to a custom stack to bypass stack traces 22->82 process10 signatures11 98 Binary is likely a compiled AutoIt script file 30->98 100 Maps a DLL or memory area into another process 30->100 102 Found direct / indirect Syscall (likely to bypass EDR) 30->102 33 icacls.exe 13 30->33         started        process12 signatures13 54 Tries to steal Mail credentials (via file / registry access) 33->54 56 Tries to harvest and steal browser information (history, passwords, etc) 33->56 58 Modifies the context of a thread in another process (thread injection) 33->58 60 3 other signatures 33->60 36 GFhbu0vO.exe 33->36 injected 40 firefox.exe 33->40         started        process14 dnsIp15 48 www.quantrai.xyz 159.198.43.66, 49782, 49783, 49784 NAMECHEAP-NET-NamecheapIncUS United States 36->48 50 matchfix.co.za 129.232.128.66, 49786, 49787, 49788 xneeloZA South Africa 36->50 52 3 other IPs or domains 36->52 84 Binary is likely a compiled AutoIt script file 36->84 signatures16
Score:
99%
Verdict:
Malware
File Type:
SCRIPT
Link:
https://malprob.io/report/ff839798f00b8d75e0123ddd92b67a8f6f450b261c6b5181cff0c4159e618b09
Gathering data
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/ff839798f00b8d75e0123ddd92b67a8f6f450b261c6b5181cff0c4159e618b09/
Threat name:
Script-JS.Trojan.AgentTesla
Create hunting rule
Status:
Malicious
First seen:
2026-07-31 12:25:44 UTC
File Type:
Text (JavaScript)
AV detection:
11 of 24 (45.83%)
Threat level:
  5/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=76bzpghqbogxlyashxozfnt2r5xukczgdrvvdaop6dcblhtbrmeq._file
Result
Malware family:
formbook
Create hunting rule
Score:
  10/10
Tags:
family:formbook adware collection defense_evasion discovery execution rat spyware stealer trojan
Link:
https://tria.ge/reports/260731-plzrmsttcv/
Behaviour
Kills process with taskkill
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: JavaScript
Enumerates physical storage devices
System Location Discovery: System Language Discovery
Suspicious use of SetThreadContext
Accesses Microsoft Outlook profiles
Checks computer location settings
Modifies file permissions
Badlisted process makes network request
Command and Scripting Interpreter: PowerShell
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/ff839798f00b8d75e0123ddd92b67a8f6f450b261c6b5181cff0c4159e618b09

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:Base64_Encoded_Powershell_Directives
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File information

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

Comments