MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 43ec2662d839781bbd41eb59f40ce37b0e505bf836d31410bc944a19fe72d1fc. 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 17 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: 43ec2662d839781bbd41eb59f40ce37b0e505bf836d31410bc944a19fe72d1fc
SHA3-384 hash: 8410509595b75bdc2aa50c63d2580128db4482e252c5774717275932b692d45cafe5fcffa0971c2a01e5691cf286c643
SHA1 hash: a93cc5775f7b632defc6a25f94d6b615a67bc3db
MD5 hash: 75e3edf01d356d77c3800670284a0f55
humanhash: jersey-cup-burger-ten
File name:MV_SEA_LADY_VESSEL_MAIN_INFORMATION.js
Download: download sample
Signature Formbook
Create hunting rule
File size:3'100'011 bytes
First seen:2026-08-12 01:08:38 UTC
Last seen:Never
File type:Java Script (JS) js
MIME type:text/plain
ssdeep 12288:yALW+sLDO0EB/KewZzKKToiJJ/yVsBNvrkuHnS27qFhhq5NdNu+YOmj8dlD6N/WT:yAy+svFEB/Kew3e+9gsQY
TLSH T10DE52B5133FEA6452E143B55B88C88494B0EE4356983A6F8F5DF0BD0672F09B6260F9F
Magika javascript
Reporter threatcat_ch
Tags:FormBook js

Intelligence

File Origin
# of uploads :
1
# of downloads :
120
Origin country :
CH CH
Vendor Threat Intelligence
No detections
Verdict:
Malicious
Threat level:
  10/10
Confidence:
100%
Tags:
anti-vm aspnet_compiler base64 downloader encrypted evasive evasive fingerprint lolbin obfuscated obfuscated powershell reconnaissance repaired
Link:
https://www.filescan.io/uploads/6a7bc7c5a9f692dc7e22ad96/reports/9fb57724-dc5d-4091-8587-bb4aeb7d75c3/overview
Verdict:
Malicious
Labled as:
Trojan/JS.Obfuscated
Link:
https://www.hybrid-analysis.com/sample/43ec2662d839781bbd41eb59f40ce37b0e505bf836d31410bc944a19fe72d1fc
Verdict:
Malicious
File Type:
js
First seen:
2026-08-11T21:43:00Z UTC
Last seen:
2026-08-12T23:00:00Z UTC
Hits:
~10000
Link:
https://opentip.kaspersky.com/43ec2662d839781bbd41eb59f40ce37b0e505bf836d31410bc944a19fe72d1fc/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/1956471
Signature
.NET source code contains potential unpacker
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
Suricata IDS alerts for network traffic
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: 1956471 Sample: MV_SEA_LADY_VESSEL_MAIN_INF... Startdate: 12/08/2026 Architecture: WINDOWS Score: 100 42 www.syney.xyz 2->42 44 www.yishengbee.com 2->44 46 5 other IPs or domains 2->46 58 Suricata IDS alerts for network traffic 2->58 60 Malicious sample detected (through community Yara rule) 2->60 62 Multi AV Scanner detection for submitted file 2->62 66 8 other signatures 2->66 11 wscript.exe 3 2->11         started        signatures3 64 Performs DNS queries to domains with low reputation 42->64 process4 file5 40 C:\Temp\ps_HFFKRfuNfCjt_1786499889929.ps1, ASCII 11->40 dropped 88 Suspicious powershell command line found 11->88 90 Wscript starts Powershell (via cmd or directly) 11->90 92 Bypasses PowerShell execution policy 11->92 94 3 other signatures 11->94 15 powershell.exe 16 11->15         started        18 taskkill.exe 1 11->18         started        signatures6 process7 signatures8 96 Writes to foreign memory regions 15->96 98 Injects a PE file into a foreign processes 15->98 20 aspnet_compiler.exe 15->20         started        23 aspnet_compiler.exe 15->23         started        25 conhost.exe 15->25         started        29 21 other processes 15->29 27 conhost.exe 18->27         started        process9 signatures10 76 Modifies the context of a thread in another process (thread injection) 20->76 78 Maps a DLL or memory area into another process 20->78 80 Queues an APC in another process (thread injection) 20->80 82 Found direct / indirect Syscall (likely to bypass EDR) 20->82 31 F74zr5Hy2E5.exe 20->31 injected 84 Unusual module load detection (module proxying) 23->84 86 Switches to a custom stack to bypass stack traces 23->86 process11 dnsIp12 48 www.yishengbee.com 38.14.131.5, 49750, 80 PEG-SV-PEGTECHINCUS United States 31->48 50 aidantsenior.fr 109.234.166.164, 49751, 49752, 49753 O2SWITCHFR France 31->50 52 3 other IPs or domains 31->52 54 Maps a DLL or memory area into another process 31->54 56 Found direct / indirect Syscall (likely to bypass EDR) 31->56 35 SearchProtocolHost.exe 13 31->35         started        signatures13 process14 signatures15 68 Tries to steal Mail credentials (via file / registry access) 35->68 70 Tries to harvest and steal browser information (history, passwords, etc) 35->70 72 Modifies the context of a thread in another process (thread injection) 35->72 74 3 other signatures 35->74 38 firefox.exe 35->38         started        process16
Score:
99%
Verdict:
Malware
File Type:
SCRIPT
Link:
https://malprob.io/report/43ec2662d839781bbd41eb59f40ce37b0e505bf836d31410bc944a19fe72d1fc
Gathering data
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/43ec2662d839781bbd41eb59f40ce37b0e505bf836d31410bc944a19fe72d1fc/
Threat name:
Script-JS.Trojan.Heuristic
Create hunting rule
Status:
Malicious
First seen:
2026-08-12 01:09:27 UTC
File Type:
Text (JavaScript)
AV detection:
13 of 24 (54.17%)
Threat level:
  2/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=ipwcmywyhf4bxpkb5nm7idhdpmhfaw7yg3jrief4srfbt7ts2h6a._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/260812-bhzqksgl9s/
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
ConfuserEx .NET packer
Suspicious use of SetThreadContext
Accesses Microsoft Outlook profiles
Checks computer location settings
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/43ec2662d839781bbd41eb59f40ce37b0e505bf836d31410bc944a19fe72d1fc

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
Create hunting rule
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: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.

Malspam

Formbook

Java Script (JS) js 43ec2662d839781bbd41eb59f40ce37b0e505bf836d31410bc944a19fe72d1fc

(this sample)

  
Delivery method
Distributed via e-mail attachment

Comments