MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 4cd3529fc035c278beb7474fd6e78aa6316bc908e105f8e12bb6ab0e79a2bc55. 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

RemcosRAT

Vendor detections: 11

Intelligence 11 IOCs 1 YARA 31 File information Comments

SHA256 hash:	4cd3529fc035c278beb7474fd6e78aa6316bc908e105f8e12bb6ab0e79a2bc55
SHA3-384 hash:	3f59f7db4c01cc5f5bb40660b6b1774108235727eac3fc12c433084b264f2accdb0524cb6fedfb6f92802726ba6a127f
SHA1 hash:	00f73b4f3f22f08de990654cc8ec07fcfda5d0c2
MD5 hash:	402b5246f1b6a941a2bd105dcf83bcf3
humanhash:	butter-burger-iowa-artist
File name:	PO.JS.js
Download:	download sample
Signature	RemcosRAT Create hunting rule
File size:	5'369'973 bytes
First seen:	2026-10-15 06:15:14 UTC
Last seen:	2026-10-21 21:20:25 UTC
File type:	js
MIME type:	application/javascript
ssdeep	98304:u+lGm06bfx4VlNzmbDiTnDAC+CBbDghprIcWD4BI/f6A6M0exWfZFTNci6YG314f:uMp48CpyprIcWD4BI/cM0kWfHNci69Cf
TLSH	T13846094E136E9071522DAB7DC2B9C9705929242B34C6DF3EB1ED6E887710A0F938F9D1
Magika	javascript
Reporter	abuse_ch
Tags:	js RAT RemcosRAT

abuse_ch

RemcosRAT C2:
31.56.209.182:2020

Indicators Of Compromise (IOCs)

Below is a list of indicators of compromise (IOCs) associated with this malware samples.

IOC	ThreatFox Reference
31.56.209.182:2020	https://threatfox.abuse.ch/ioc/1966873/

Intelligence

File Origin

# of uploads :

# of downloads :

251

Origin country :

Vendor Threat Intelligence

No detections

Detection(s):

SecuriteInfo.com.Other.Malware-gen.54726312.UNOFFICIAL

Verdict:

Malicious

Score:

97.4%

Link:

https://cyber-fortress.com/docs/result/index.php?id=6ad19a256f551121ba16730b

Tags:

autorun cobalt

Verdict:

Malicious

Threat level:

10/10

Confidence:

100%

Tags:

anti-debug dropper evasive obfuscated obfuscated packed repaired

Link:

https://www.filescan.io/uploads/6ad06f7cb14b1177a740e036/reports/32c05f1b-e154-4c05-a866-987cabe1b0d6/overview

Verdict:

Suspicious

Labled as:

JS/Agent.ECX3

Link:

https://www.hybrid-analysis.com/sample/4cd3529fc035c278beb7474fd6e78aa6316bc908e105f8e12bb6ab0e79a2bc55

Verdict:

Malicious

File Type:

First seen:

2026-10-15T03:06:00Z UTC

Last seen:

2026-10-17T04:21:00Z UTC

Hits:

~1000

Link:

https://opentip.kaspersky.com/4cd3529fc035c278beb7474fd6e78aa6316bc908e105f8e12bb6ab0e79a2bc55/results?tab=lookup

Result

Threat name:

Remcos, DonutLoader

Detection:

malicious

Classification:

troj.spyw.expl.evad

Score:

100 / 100

Link:

https://www.joesandbox.com/analysis/1987379

Signature

Antivirus detection for URL or domain

C2 URLs / IPs found in malware configuration

Contains functionality to inject threads in other processes

Contains functionality to steal Internet Explorer form passwords

Detected Remcos RAT

Found API chain indicative of debugger detection

Found direct / indirect Syscall (likely to bypass EDR)

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

Malicious sample detected (through community Yara rule)

Sigma detected: Invoke-Obfuscation CLIP+ Launcher

Sigma detected: Invoke-Obfuscation VAR+ Launcher

Sigma detected: Remcos

Sigma detected: WScript or CScript Dropper

Suricata IDS alerts for network traffic

Tries to detect sandboxes / dynamic malware analysis system (Installed program check)

Tries to harvest and steal browser information (history, passwords, etc)

Tries to steal Mail credentials (via file registry)

Unusual module load detection (module proxying)

Uses schtasks.exe or at.exe to add and modify task schedules

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 DonutLoader

Yara detected Remcos RAT

Yara detected UAC Bypass using CMSTP

Behaviour

Behavior Graph:

Download SVG

Score:

99%

Verdict:

Malware

File Type:

SCRIPT

Link:

https://malprob.io/report/4cd3529fc035c278beb7474fd6e78aa6316bc908e105f8e12bb6ab0e79a2bc55

Gathering data

Detection:

n/a

Link:

https://mwdb.cert.pl/sample/4cd3529fc035c278beb7474fd6e78aa6316bc908e105f8e12bb6ab0e79a2bc55/

Detection(s):

Suspicious file

Link:

https://check.spamhaus.org/check/?searchterm=jtjvfh6agxbhrpvxi5h5nz4kuyywxsii4ec7ryjlw2vq46ncxrkq._file

Verdict:

malicious

Label(s):

DonutLoader

Remcos

Link:

https://reports.threatray.com/a6af37b2-089d-45bf-aa31-68fb6c1efea6

Result

Malware family:

remcos

Score:

10/10

Tags:

family:donutloader family:remcos botnet:ekwutos collection defense_evasion discovery execution loader persistence rat spyware stealer suricata trojan

Link:

https://tria.ge/reports/261015-gz5k2sfz4s/

Behaviour

Modifies registry class

NTFS ADS

Scheduled Task/Job: Scheduled Task

Suspicious behavior: GetForegroundWindowSpam

Suspicious use of WriteProcessMemory

System policy modification

Uses Task Scheduler COM API

outlook_office_path

Command and Scripting Interpreter: JavaScript

Enumerates physical storage devices

Executes a command shell one-liner

Reads the TCP/IP host and domain name from the registry

Accesses Microsoft Outlook profiles

Checks installed software on the system

Checks computer location settings

Executes dropped EXE

Reads user/profile data of web browsers

Detects DonutLoader

Family: DonutLoader

Family: Remcos

Suricata alert: REMCOS RAT Malware Inbound C2 Communication

Suricata alert: REMCOS RAT Malware Outbound C2 Communication

UAC bypass

Malware Config

C2 Extraction:

vuacas.com:2020

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/4cd3529fc035c278beb7474fd6e78aa6316bc908e105f8e12bb6ab0e79a2bc55

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:	cobalt_strike_tmp01925d3f Create hunting rule
Author:	The DFIR Report
Description:	files - file ~tmp01925d3f.exe
Reference:	https://thedfirreport.com

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__API 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:	Disable_Defender Create hunting rule
Author:	iam-py-test
Description:	Detect files disabling or modifying Windows Defender, Windows Firewall, or Microsoft Smartscreen

Rule name:	golang_bin_JCorn_CSC846 Create hunting rule
Author:	Justin Cornwell
Description:	CSC-846 Golang detection ruleset

Rule name:	INDICATOR_SUSPICIOUS_Binary_References_Browsers Create hunting rule
Author:	ditekSHen
Description:	Detects binaries (Windows and macOS) referencing many web browsers. Observed in information stealers.

Rule name:	INDICATOR_SUSPICIOUS_EXE_UACBypass_CMSTPCOM Create hunting rule
Author:	ditekSHen
Description:	Detects Windows exceutables bypassing UAC using CMSTP COM interfaces. MITRE (T1218.003)

Rule name:	MULTI_Malware_AgentTesla_ForgeAuto_ed343f78_Extrait Create hunting rule
Author:	Marjoriefort
Description:	Detects AgentTesla (inconnu, etat extrait)

Rule name:	pe_detect_tls_callbacks Create hunting rule

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:	REMCOS_RAT_variants Create hunting rule

Rule name:	Remcos_unpacked_PulseIntel Create hunting rule
Author:	PulseIntel
Description:	Remcos Payload

Rule name:	SUSP_Script_PowerShell_Hidden_Launcher Create hunting rule
Author:	Marjoriefort
Description:	Script (JS/VBS) lancant PowerShell en mode furtif - dropper frais MalwareBazaar
Reference:	Veille fraicheur 2026-09-14 / cluster misses web

Rule name:	Sus_CMD_Powershell_Usage Create hunting rule
Author:	XiAnzheng
Description:	May Contain(Obfuscated or no) Powershell or CMD Command that can be abused by threat actor(can create FP)

Rule name:	ThreadControl__Context Create hunting rule
Reference:	https://github.com/naxonez/yaraRules/blob/master/AntiDebugging.yara

Rule name:	TigerRAT_pe_yaraify Create hunting rule
Author:	hunts-yara-code
Description:	YARAify-tightened byte rule from 9 sample(s) -- VERIFY hits

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_Remcos_921ef449 Create hunting rule
Author:	Elastic Security

Rule name:	Windows_Trojan_Remcos_b296e965 Create hunting rule
Author:	Elastic Security
Reference:	https://www.elastic.co/security-labs/exploring-the-ref2731-intrusion-set

Rule name:	Win_Clipboard_Clipper_Thengavar Create hunting rule
Author:	Thengavar
Description:	Detects malware manipulating the Windows clipboard for clipping or crypto stealing attacks

Rule name:	WIN_Malware_Unknown_ForgeAuto_2ffc3572 Create hunting rule
Author:	Marjoriefort
Description:	Detects Unknown (pe, etat binaire)

Rule name:	WIN_Malware_Unknown_ForgeAuto_43faefd2 Create hunting rule
Author:	Marjoriefort
Description:	Detects Unknown (pe, etat binaire)

Rule name:	WIN_Malware_Unknown_ForgeAuto_5001c94c Create hunting rule
Author:	Marjoriefort
Description:	Detects Unknown (pe, etat binaire)

Rule name:	WIN_Malware_Unknown_ForgeAuto_74566f98 Create hunting rule
Author:	Marjoriefort
Description:	Detects Unknown (pe, etat binaire)

Rule name:	WIN_Malware_Unknown_ForgeAuto_79234c04 Create hunting rule
Author:	Marjoriefort
Description:	Detects Unknown (pe, etat binaire)

Rule name:	WIN_Malware_Unknown_ForgeAuto_f1079127 Create hunting rule
Author:	Marjoriefort
Description:	Detects Unknown (pe, etat binaire)

Rule name:	win_remcos_rat_unpacked Create hunting rule
Author:	Matthew @ Embee_Research
Description:	Detects strings present in remcos rat Samples.

Rule name:	win_remcos_w0 Create hunting rule
Author:	Matthew @ Embee_Research
Description:	Detects strings present in remcos rat Samples.

Rule name:	yarahub_win_remcos_rat_unpacked_aug_2023 Create hunting rule
Author:	Matthew @ Embee_Research

File information

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

No further information available

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