MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 b2921bd743c2b8be848c8c42e7b13c8d3d13920e2fa79f0491df7d3a2c248585. 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 23 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: b2921bd743c2b8be848c8c42e7b13c8d3d13920e2fa79f0491df7d3a2c248585
SHA3-384 hash: 351a87b4c91bf9fd53d2189f3e24506022188f13cfc9e79763678db6b9cd0c6de9806d3484fe326627260af772802826
SHA1 hash: 46a8a34cbf66304350eba43c70f5f8e8c00fee19
MD5 hash: 3f0bc0a27f43629bf148bf0148212256
humanhash: johnny-carolina-october-alabama
File name:jkgtholb.JS
Download: download sample
Signature Formbook
Create hunting rule
File size:3'117'252 bytes
First seen:2026-08-05 08:15:38 UTC
Last seen:Never
File type:Java Script (JS) js
MIME type:text/plain
ssdeep 49152:g3t/kC1+PtJH2g8ojawSndXxb5XCzOs1BawaTsLxqzHA5BHgVMF+MjJa2h4pe4t3:rC1+PtJH2g8ojawSndXxb5XCys1uTsFw
TLSH T167E5E94017C6A5323371BB9DB239DE30D58B49136485CB0235BDE6283B6CE8B9754BFA
Magika javascript
Reporter abuse_ch
Tags:FormBook js

Intelligence

File Origin
# of uploads :
1
# of downloads :
152
Origin country :
SE SE
Vendor Threat Intelligence
No detections
Detection(s):
Sanesecurity.Malware.29031.BadJs.UNOFFICIAL
Create hunting rule

Verdict:
Malicious
Threat level:
  10/10
Confidence:
100%
Tags:
anti-debug base64 dropper evasive obfuscated packed repaired
Link:
https://www.filescan.io/uploads/6a72f15f7bb7fba3cab84cdf/reports/05dc0a96-14f9-4cf5-ae06-fb8315310970/overview
Verdict:
Unknown
Link:
https://www.hybrid-analysis.com/sample/b2921bd743c2b8be848c8c42e7b13c8d3d13920e2fa79f0491df7d3a2c248585
Verdict:
Malicious
File Type:
js
First seen:
2026-08-04T11:43:00Z UTC
Last seen:
2026-08-05T03:23:00Z UTC
Hits:
~100
Link:
https://opentip.kaspersky.com/b2921bd743c2b8be848c8c42e7b13c8d3d13920e2fa79f0491df7d3a2c248585/results?tab=lookup
Result
Threat name:
FormBook
Create hunting rule
Detection:
malicious
Classification:
troj.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/1952461
Signature
Antivirus / Scanner detection for submitted sample
C2 URLs / IPs found in malware configuration
Found API chain indicative of debugger detection
Found malware configuration
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
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)
Modifies the prolog of user mode functions (user mode inline hooks)
Multi AV Scanner detection for submitted file
Queues an APC in another process (thread injection)
Sample uses process hollowing technique
Sigma detected: WScript or CScript Dropper
Suricata IDS alerts for network traffic
Switches to a custom stack to bypass stack traces
System process connects to network (likely due to code injection or exploit)
Tries to detect virtualization through RDTSC time measurements
Unusual module load detection (module proxying)
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: 1952461 Sample: jkgtholb.JS.js Startdate: 05/08/2026 Architecture: WINDOWS Score: 100 36 www.ny-realestate4u.com 2->36 38 www.khiyanthelemonlabboss.com 2->38 40 7 other IPs or domains 2->40 44 Suricata IDS alerts for network traffic 2->44 46 Found malware configuration 2->46 48 Malicious sample detected (through community Yara rule) 2->48 50 9 other signatures 2->50 11 wscript.exe 1 3 2->11         started        signatures3 process4 signatures5 60 Windows Scripting host queries suspicious COM object (likely to drop second stage) 11->60 62 WScript reads language and country specific registry keys (likely country aware script) 11->62 14 PSIPPXLSFHJDJGSN.PIF 1 11->14         started        process6 signatures7 64 Found API chain indicative of debugger detection 14->64 66 Modifies the context of a thread in another process (thread injection) 14->66 68 Maps a DLL or memory area into another process 14->68 70 4 other signatures 14->70 17 explorer.exe 56 1 14->17 injected 21 conhost.exe 14->21         started        process8 dnsIp9 30 www.betikaagen.com 104.21.83.147, 49762, 80 CLOUDFLARENET-CloudflareIncUS Canada 17->30 32 www.ny-realestate4u.com 172.67.161.198, 49760, 80 CLOUDFLARENET-CloudflareIncUS Canada 17->32 34 td-ccm-neg-87-45.wixdns.net 34.149.87.45, 49761, 80 GOOGLE-CLOUD-PLATFORM-GoogleLLCUS United States 17->34 42 System process connects to network (likely due to code injection or exploit) 17->42 23 chkdsk.exe 17->23         started        signatures10 process11 signatures12 52 Modifies the context of a thread in another process (thread injection) 23->52 54 Maps a DLL or memory area into another process 23->54 56 Tries to detect virtualization through RDTSC time measurements 23->56 58 2 other signatures 23->58 26 cmd.exe 1 23->26         started        process13 process14 28 conhost.exe 26->28         started       
Score:
99%
Verdict:
Malware
File Type:
SCRIPT
Link:
https://malprob.io/report/b2921bd743c2b8be848c8c42e7b13c8d3d13920e2fa79f0491df7d3a2c248585
Gathering data
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/b2921bd743c2b8be848c8c42e7b13c8d3d13920e2fa79f0491df7d3a2c248585/
Threat name:
Script-JS.Dropper.ObfLoader
Create hunting rule
Status:
Malicious
First seen:
2026-08-04 19:38:51 UTC
AV detection:
11 of 37 (29.73%)
Threat level:
  3/5
Detection(s):
Malicious file
Link:
https://check.spamhaus.org/check/?searchterm=wkjbxv2dyk4l5bemrrbopmj4ru6rheqof6tz6ber356tulbeqwcq._file
Verdict:
malicious
Label(s):
Formbook
Create hunting rule
Link:
https://reports.threatray.com/5f68bfb8-a943-499a-b972-fcaab97723b4
Result
Malware family:
formbook
Create hunting rule
Score:
  10/10
Tags:
family:formbook campaign:go85 discovery execution rat spyware stealer trojan
Link:
https://tria.ge/reports/260805-j6ghxagb63/
Behaviour
Modifies registry class
Suspicious behavior: EnumeratesProcesses
Suspicious behavior: GetForegroundWindowSpam
Suspicious behavior: MapViewOfSection
Suspicious use of AdjustPrivilegeToken
Suspicious use of WriteProcessMemory
Command and Scripting Interpreter: JavaScript
Enumerates physical storage devices
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/b2921bd743c2b8be848c8c42e7b13c8d3d13920e2fa79f0491df7d3a2c248585

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:Formbook
Create hunting rule
Author:JPCERT/CC Incident Response Group
Description:detect Formbook in memory
Reference:internal research
Rule name:FormhookA
Create hunting rule
Author:kevoreilly
Description:Formbook Anti-hook Bypass
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:meth_stackstrings
Create hunting rule
Author:Willi Ballenthin
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:TH_AntiVM_MassHunt_Win_Malware_2026_CYFARE
Create hunting rule
Author:CYFARE
Description:Detects Windows malware employing anti-VM / anti-sandbox evasion techniques across VMware, VirtualBox, Hyper-V, QEMU, Xen, and generic sandbox environments
Reference:https://cyfare.net/
Rule name:TH_Win_ETW_Bypass_2025_CYFARE
Create hunting rule
Author:CYFARE
Description:Windows ETW Bypass Detection Rule - 2025
Reference:https://cyfare.net/
Rule name:VECT_Ransomware
Create hunting rule
Author:Mustafa Bakhit
Description:Detects activity associated with VECT ransomware. This includes registry modifications and deletions, execution of system and defense-evasion commands, suspicious API usage, mutex creation, file and memory manipulation, ransomware note generation, anti-debugging and anti-analysis techniques, and embedded cryptographic constants (SHA256) characteristic of this malware family. Designed for threat intelligence and malware detection environments.
Rule name:Windows_Trojan_Formbook
Create hunting rule
Author:@malgamy12
Rule name:Windows_Trojan_Formbook_1112e116
Create hunting rule
Author:Elastic Security
Reference:https://www.elastic.co/security-labs/formbook-adopts-cab-less-approach
Rule name:win_formbook_auto
Create hunting rule
Author:Felix Bilstein - yara-signator at cocacoding dot com
Description:Detects win.formbook.
Rule name:win_formbook_w0
Create hunting rule
Author:@malgamy12

File information

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

Comments