MalwareBazaar Database
You are currently viewing the MalwareBazaar entry for SHA256 ecb58cb29078d9646ad1dcdbe51526f2d9cfea06be5fb2ab183e8ecc3ab6bf15. 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
Threat unknown
Vendor detections: 8
| SHA256 hash: | ecb58cb29078d9646ad1dcdbe51526f2d9cfea06be5fb2ab183e8ecc3ab6bf15 |
|---|---|
| SHA3-384 hash: | 846e65836036aeb89b08220221e4ad5b7afe8d61342d74faa9af0c44fc011a3628428862b3eea1ca3041652337036915 |
| SHA1 hash: | 7d52fa561468f0c77bca112f8393399dec078d02 |
| MD5 hash: | f49bcd657ef1e626e85ce858958c1769 |
| humanhash: | delta-neptune-alanine-fanta |
| File name: | extension.js |
| Download: | download sample |
| File size: | 3'692'922 bytes |
| First seen: | 2026-10-30 11:29:15 UTC |
| Last seen: | Never |
| File type: |  js |
| MIME type: | application/javascript |
| ssdeep | 49152:CGGoyfcH1m+b6Xm/fTz9mEVZohK3KDxIoIo3LCHKtUJi1anlulfmpH5Xk9JCnUY/:/c/I34+O4Q8VtiNwD8c |
| TLSH | T1A6067CD6B3DBB6370FE560B4947B0202F37D6D549448842DF2A8A4CB366884996F3F78 |
| TrID | 70.3% (.) AGraph input data (with rem) (9500/1/3) 29.6% (.DII) Summation Document Image Information Load File (4000/1/1) |
| Magika | javascript |
| Reporter |  ffforward |
| Tags: | 2.1.313 ClaudeCode CursorCompromise extension js vscode |
ffforward
This is the JavaScript from the malicious Claude Code 2.1.313 extension published on the Cursor Marketplace. Evidence points to that this was an isolated Cursor marketplace infrastructure compromise. Upstream NPM (@anthropic-ai/claude-code), Open-VSX, Anthropic accounts, and the Microsoft VS Code marketplace were likely never compromised or affected.Intelligence
File Origin
# of uploads :
1
# of downloads :
189
Origin country :
SEVendor Threat Intelligence
No detections
Verdict:
Clean
Score:
99.9%
Tags:
n/a
Verdict:
Likely Malicious
Threat level:
7.5/10
Confidence:
100%
Tags:
ai-borne llm-interaction obfuscated repaired
Verdict:
Suspicious
Verdict:
Malicious
File Type:
js
First seen:
2026-10-30T10:05:00Z UTC
Last seen:
2026-10-31T08:32:00Z UTC
Hits:
~10
Detections:
HEUR:Trojan.Script.Generic HEUR:Trojan.Script.Claugent.gen
Result
Threat name:
n/a
Detection:
malicious
Classification:
evad
Score:
52 / 100
Signature
JavaScript file contains Antivirus product strings
JavaScript file contains suspicious strings
Sigma detected: WScript or CScript Dropper
Behaviour
Behavior Graph:
Score:
1%
Verdict:
Benign
File Type:
SCRIPT
Verdict:
Malware
YARA:
5 match(es)
Tags:
Base64 Block Contains Base64 Block DeObfuscated Html Javascript PowerShell T1027 T1059.001 T1059.007 T1105
Threat name:
Script-JS.Backdoor.SupplyChain
Status:
Malicious
First seen:
2026-10-30 09:36:05 UTC
File Type:
Text (JavaScript)
AV detection:
11 of 23 (47.83%)
Threat level:
5/5
Detection(s):
Suspicious file
Result
Malware family:
n/a
Score:
3/10
Tags:
execution
Behaviour
Command and Scripting Interpreter: JavaScript
Please note that we are no longer able to provide a coverage score for Virus Total.
Threat name:
Malicious File
Score:
1.00
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 |
|---|---|
| Author: | DiegoAnalytics |
| Description: | Detects attempts to inject code into another process across PE, ELF, Mach-O binaries |
| Rule name: | DetectEncryptedVariants |
|---|---|
| Author: | Zinyth |
| Description: | Detects 'encrypted' in ASCII, Unicode, base64, or hex-encoded |
| Rule name: | Detect_all_IPv6_variants |
|---|---|
| Author: | Bierchermuesli |
| Description: | Generic IPv6 catcher |
| Rule name: | FreddyBearDropper |
|---|---|
| Author: | Dwarozh Hoshiar |
| Description: | Freddy Bear Dropper is dropping a malware through base63 encoded powershell scrip. |
| Rule name: | html_auto_download_b64 |
|---|---|
| Author: | Tdawg |
| Description: | html auto download |
| Rule name: | Hunt_KiraAsciiObfuscator |
|---|---|
| Author: | Serhii Kocherhan |
| Description: | Detects files and scripts obfuscated using KiraAsciiObfuscator patterns and structural artifacts |
| Rule name: | LLM_API_Anthropic |
|---|---|
| Author: | llm-api-abuse-pilot |
| Description: | References Anthropic API |
| Rule name: | LLM_API_OpenAI |
|---|---|
| Author: | llm-api-abuse-pilot |
| Description: | References OpenAI API endpoints or key material |
| Rule name: | mht_inside_word |
|---|---|
| Author: | dPhish |
| Description: | Detect embedded mht files inside microsfot word. |
| Rule name: | MULTI_Malware_RemcosRAT_ForgeAuto_4785f0c3 |
|---|---|
| Author: | Marjoriefort |
| Description: | Detects RemcosRAT (inconnu, etat binaire) |
| Rule name: | NET |
|---|---|
| Author: | malware-lu |
| Rule name: | RANSOMWARE |
|---|---|
| Author: | ToroGuitar |
| Rule name: | Suspicious_Process |
|---|---|
| Author: | Security Research Team |
| Description: | Suspicious process creation |
| Rule name: | SUSP_HTML_XMLHTTP_Redirect_Kit |
|---|---|
| Author: | Marjoriefort |
| Description: | HTML avec exfiltration XMLHTTP + redirection window.location - kit phishing frais |
| Reference: | Veille fraicheur 2026-09-14 / cluster HTML |
| Rule name: | Sus_CMD_Powershell_Usage |
|---|---|
| Author: | XiAnzheng |
| Description: | May Contain(Obfuscated or no) Powershell or CMD Command that can be abused by threat actor(can create FP) |
| Rule name: | telebot_framework |
|---|---|
| Author: | vietdx.mb |
File information
The table below shows additional information about this malware sample such as delivery method and external references.
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