MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 5ef13adb1cacef97a48246a5b92634225f332e24c22e11ec7f3161d49595fa5f. 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 YARA 25 File information Comments

SHA256 hash:	5ef13adb1cacef97a48246a5b92634225f332e24c22e11ec7f3161d49595fa5f
SHA3-384 hash:	d5a1e8f83407fd7979ad6d913f32b37edcbfe95e29286c0a2d8ea34d10077a333c48a8b1e17eea0644d2077503c639dd
SHA1 hash:	9a1653887aa64346ceb1b0be15887f75677af7bd
MD5 hash:	a36f45b510b58670953e109ec95fcbfc
humanhash:	massachusetts-four-lemon-hot
File name:	MCS-EFTKRUS25_for August settlement 2025-pdf.js
Download:	download sample
Signature	RemcosRAT Create hunting rule
File size:	815'923 bytes
First seen:	2025-08-06 19:34:15 UTC
Last seen:	Never
File type:	js
MIME type:	text/plain
ssdeep	12288:jwD8MmkJKCc/MR+YVIE1itY8jgn3bfe5hSel1Qwst/wqjGb898nYaiLZCA+lPdf5:kD8CJKC0ZGEBjg3bJwywPb8SRJ7meBUY
Threatray	1'256 similar samples on MalwareBazaar
TLSH	T19905022D8CBEADED01377D95218BA303D4DC0BB3E03DD9604966F479B954C8F8AEA149
Magika	javascript
Reporter	abuse_ch
Tags:	js RAT RemcosRAT

Intelligence

File Origin

# of uploads :

# of downloads :

Origin country :

Vendor Threat Intelligence

Detection(s):

SecuriteInfo.com.BAT.Obfus-5.UNOFFICIAL

Verdict:

Malicious

Score:

92.5%

Link:

https://cyber-fortress.com/docs/result/index.php?id=6893ae5811d7f9b979e62fbf

Tags:

phishing lien

Verdict:

Suspicious

Labled as:

JS/TrojanDropper.Agent

Link:

https://www.hybrid-analysis.com/sample/5ef13adb1cacef97a48246a5b92634225f332e24c22e11ec7f3161d49595fa5f

Result

Threat name:

Remcos

Detection:

malicious

Classification:

phis.troj.spyw.expl.evad

Score:

100 / 100

Link:

https://www.joesandbox.com/analysis/1751659

Signature

.NET source code contains a sample name check

.NET source code references suspicious native API functions

Antivirus detection for dropped file

C2 URLs / IPs found in malware configuration

Creates processes via WMI

Found hidden mapped module (file has been removed from disk)

Found malware configuration

Found suspicious powershell code related to unpacking or dynamic code loading

Installs a global keyboard hook

Joe Sandbox ML detected suspicious sample

Malicious sample detected (through community Yara rule)

Maps a DLL or memory area into another process

Multi AV Scanner detection for dropped file

Multi AV Scanner detection for submitted file

Powershell drops PE file

Sigma detected: Base64 Encoded PowerShell Command Detected

Sigma detected: PowerShell Base64 Encoded FromBase64String Cmdlet

Sigma detected: PowerShell Base64 Encoded IEX Cmdlet

Sigma detected: WScript or CScript Dropper

Suricata IDS alerts for network traffic

Suspicious execution chain found

Suspicious powershell command line found

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

Tries to steal Instant Messenger accounts or passwords

Tries to steal Mail credentials (via file / registry access)

Tries to steal Mail credentials (via file registry)

Windows Scripting host queries suspicious COM object (likely to drop second stage)

Wscript starts Powershell (via cmd or directly)

Yara detected Powershell decode and execute

Yara detected Remcos RAT

Yara detected UAC Bypass using CMSTP

Yara detected WebBrowserPassView password recovery tool

Behaviour

Behavior Graph:

Download SVG

Score:

100%

Verdict:

Malware

File Type:

SCRIPT

Link:

https://malprob.io/report/5ef13adb1cacef97a48246a5b92634225f332e24c22e11ec7f3161d49595fa5f

Verdict:

inconclusive

YARA:

1 match(es)

Link:

https://app.malva.re/file/a36f45b510b58670953e109ec95fcbfc

Detection:

n/a

Link:

https://mwdb.cert.pl/sample/5ef13adb1cacef97a48246a5b92634225f332e24c22e11ec7f3161d49595fa5f/

Verdict:

Malicious

Threat:

Family.REMCOS

Link:

https://tip.neiki.dev/file/5ef13adb1cacef97a48246a5b92634225f332e24c22e11ec7f3161d49595fa5f

Threat name:

Script-JS.Backdoor.Remcos

Status:

Malicious

First seen:

2025-08-06 08:15:11 UTC

File Type:

Text (HTML)

AV detection:

11 of 24 (45.83%)

Threat level:

5/5

Detection(s):

Malicious file

Link:

https://check.spamhaus.org/check/?searchterm=l3ytvwy4vtxzpjeci2s3sjruejptglreyixbd3d7gfq5jfmv7jpq._file

Verdict:

malicious

Label(s):

remcos

donut_injector

RemcosRAT

60682c9e70f15ee5e31dc5c054417386098c475be469994ea54b5c56847d4aaf

RemcosRAT

6400bf9fe56615568b8bd3ec6967fb72393b9df9a6bba89860ca95d8102afbf8

RemcosRAT

6fd471d3b5a60eb2827287c5b805a12d8e4147c5c2ce85585b3e2748a10e6226

RemcosRAT

c7e099c60f551279ad41d2f35a001e14082346f15e312560771dac7302964da9

RemcosRAT

d25ce51a5c23df06ac177ac26091a18fda74a57bcf60391b2fdafbdfb589edb9

RemcosRAT

e646f69ab13559c8f45cf9ec17c23b359bfd93a61d4932da2d81aab6f25c9d79

RemcosRAT

error

RemcosRAT

+ 1'246 additional samples on MalwareBazaar

Result

Malware family:

donutloader

Score:

10/10

Tags:

family:donutloader collection discovery execution loader

Link:

https://tria.ge/reports/250806-yaef1aen7y/

Behaviour

Suspicious behavior: EnumeratesProcesses

Suspicious use of AdjustPrivilegeToken

Suspicious use of SetWindowsHookEx

Suspicious use of WriteProcessMemory

Command and Scripting Interpreter: JavaScript

System Location Discovery: System Language Discovery

Suspicious use of SetThreadContext

Accesses Microsoft Outlook accounts

Command and Scripting Interpreter: PowerShell

Blocklisted process makes network request

Detected Nirsoft tools

NirSoft MailPassView

NirSoft WebBrowserPassView

Detects DonutLoader

DonutLoader

Donutloader family

Process spawned unexpected child process

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/5ef13adb1cacef97a48246a5b92634225f332e24c22e11ec7f3161d49595fa5f

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:	botnet_plaintext_c2 Create hunting rule
Author:	cip
Description:	Attempts to match at least some of the strings used in some botnet variants which use plaintext communication protocols.

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

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:	FreddyBearDropper Create hunting rule
Author:	Dwarozh Hoshiar
Description:	Freddy Bear Dropper is dropping a malware through base63 encoded powershell scrip.

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

Rule name:	INDICATOR_EXE_Packed_MPress Create hunting rule
Author:	ditekSHen
Description:	Detects executables built or packed with MPress PE compressor

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:	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:	Remcos Create hunting rule
Author:	kevoreilly
Description:	Remcos Payload

Rule name:	remcos_ Create hunting rule
Author:	Michelle Khalil
Description:	This rule detects unpacked remcos malware samples.

Rule name:	REMCOS_RAT_variants Create hunting rule

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

Rule name:	SUSP_PS1_JAB_Pattern_Jun22_1 Create hunting rule
Author:	Florian Roth (Nextron Systems)
Description:	Detects suspicious UTF16 and Base64 encoded PowerShell code that starts with a $ sign and a single char variable
Reference:	Internal Research

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:	Sus_Obf_Enc_Spoof_Hide_PE Create hunting rule
Author:	XiAnzheng
Description:	Check for Overlay, Obfuscating, Encrypting, Spoofing, Hiding, or Entropy Technique(can create FP)

Rule name:	TeslaCryptPackedMalware Create hunting rule

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

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_remcos_auto Create hunting rule
Author:	Felix Bilstein - yara-signator at cocacoding dot com
Description:	Detects win.remcos.

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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