MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 503fe08a261119a1521967a64b944d12512efd6b5360ce89b74568b41183ddd9. 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: 10

Intelligence 10 IOCs YARA 21 File information Comments

SHA256 hash:	503fe08a261119a1521967a64b944d12512efd6b5360ce89b74568b41183ddd9
SHA3-384 hash:	ba9e59fa7bf570d1502ecc926c5f9007b6d558463626e728b2436d5dad87b96a3b28fee3ca37da4e3b2dfc472b33ca99
SHA1 hash:	a55da47a64e8ec02c3afdbe9111610146bb2c0ba
MD5 hash:	87cbd7abe61fc37d4eeb993c57372c1a
humanhash:	mike-artist-nitrogen-red
File name:	Deutsche_Bank_9236_20384_invoice.pdf.js
Download:	download sample
Signature	RemcosRAT Create hunting rule
File size:	781'843 bytes
First seen:	2025-08-05 13:01:20 UTC
Last seen:	Never
File type:	js
MIME type:	text/plain
ssdeep	12288:JXJsw8TqCf/fjw/K3wP5Hp4UFcSuNion4ct0u0a6PS+Sj1H1CS0jwM7RoDZ7iACD:tJ4xXkp7uSyqcadPS+Sjx1Cjj7Rog/L
Threatray	4'118 similar samples on MalwareBazaar
TLSH	T16FF4F1BCCCAD6DED1B6439D670E5875638CC47E3E07D6E384892ACB75C68E4D866280C
Magika	javascript
Reporter	abuse_ch
Tags:	DeutscheBank 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:

94.9%

Link:

https://cyber-fortress.com/docs/result/index.php?id=689200e01e8a59ee04e59fab

Tags:

backdoor spawn sage

Gathering data

Verdict:

Unknown

Link:

https://www.hybrid-analysis.com/sample/503fe08a261119a1521967a64b944d12512efd6b5360ce89b74568b41183ddd9

Result

Threat name:

Remcos

Detection:

malicious

Classification:

troj.expl.evad

Score:

100 / 100

Link:

https://www.joesandbox.com/analysis/1750512

Signature

.NET source code contains a sample name check

.NET source code references suspicious native API functions

C2 URLs / IPs found in malware configuration

Creates processes via WMI

Detected Remcos RAT

Found malware configuration

Found suspicious powershell code related to unpacking or dynamic code loading

Joe Sandbox ML detected suspicious sample

Malicious sample detected (through community Yara rule)

Sigma detected: Base64 Encoded PowerShell Command Detected

Sigma detected: PowerShell Base64 Encoded FromBase64String Cmdlet

Sigma detected: PowerShell Base64 Encoded IEX Cmdlet

Sigma detected: Remcos

Sigma detected: Suspicious Parent Double Extension File Execution

Sigma detected: WScript or CScript Dropper

Suricata IDS alerts for network traffic

Suspicious execution chain found

Suspicious powershell command line found

Uses an obfuscated file name to hide its real file extension (double extension)

Uses dynamic DNS services

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

Behaviour

Behavior Graph:

Download SVG

Score:

100%

Verdict:

Malware

File Type:

SCRIPT

Link:

https://malprob.io/report/503fe08a261119a1521967a64b944d12512efd6b5360ce89b74568b41183ddd9

Verdict:

inconclusive

YARA:

2 match(es)

Link:

https://app.malva.re/file/87cbd7abe61fc37d4eeb993c57372c1a

Detection:

remcos

Link:

https://mwdb.cert.pl/sample/503fe08a261119a1521967a64b944d12512efd6b5360ce89b74568b41183ddd9/

Verdict:

Malicious

Threat:

Family.REMCOS

Link:

https://tip.neiki.dev/file/503fe08a261119a1521967a64b944d12512efd6b5360ce89b74568b41183ddd9

Threat name:

Script-JS.Backdoor.Remcos

Status:

Malicious

First seen:

2025-08-05 13:02:24 UTC

File Type:

Text (HTML)

AV detection:

10 of 24 (41.67%)

Threat level:

5/5

Detection(s):

Malicious file

Link:

https://check.spamhaus.org/check/?searchterm=ka76bcrgcem2cuqzm6texfcncjis57llknqm5cnxivuliemd3xmq._file

Result

Malware family:

donutloader

Score:

10/10

Tags:

family:donutloader discovery execution loader

Link:

https://tria.ge/reports/250805-p9yt9avrx2/

Behaviour

Suspicious behavior: EnumeratesProcesses

Suspicious use of AdjustPrivilegeToken

Suspicious use of WriteProcessMemory

Command and Scripting Interpreter: JavaScript

System Location Discovery: System Language Discovery

Command and Scripting Interpreter: PowerShell

Blocklisted process makes network request

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.

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:	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:	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:	iexplorer_remcos Create hunting rule
Author:	iam-py-test
Description:	Detect iexplorer being taken over by Remcos

Rule name:	INDICATOR_SUSPICIOUS_EXE_UACBypass_EventViewer Create hunting rule
Author:	ditekSHen
Description:	detects Windows exceutables potentially bypassing UAC using eventvwr.exe

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 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:	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_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:	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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