MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 a4a77ba60fd4b409707b1d363d20509eb3b4b527789eec5b6f4c874bc20576ac. 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: 14

Intelligence 14 IOCs YARA 23 File information Comments

SHA256 hash:	a4a77ba60fd4b409707b1d363d20509eb3b4b527789eec5b6f4c874bc20576ac
SHA3-384 hash:	cc2d884ee48129d6d0968ea3ae5064b9d31535fc9e7874a007098397b9181bbd36747c1ea48261f4fbeb959ca8b57445
SHA1 hash:	07121691a78f4b28cbf59ef781a10a2c95371e77
MD5 hash:	587f9c7622d66ffc1303e8f2ea7934ae
humanhash:	red-whiskey-shade-west
File name:	IMG-202508-WA0008.js
Download:	download sample
Signature	RemcosRAT Create hunting rule
File size:	2'097'504 bytes
First seen:	2025-09-01 07:31:05 UTC
Last seen:	2025-09-02 12:00:32 UTC
File type:	js
MIME type:	text/plain
ssdeep	24576:JPMYqg803Q4JEsEXA0rgf1lZEeg2QxCblTy8L3u9bWIkZvB5Y0hl1mi61HG/VMYI:9zxJEsh1ZEeDB29wvBK00DL2kGyN
Threatray	271 similar samples on MalwareBazaar
TLSH	T1FFA5E1328D577C4D2BEC258884CE3DD14D6E1FDB41389ED4999AF1B2228AD119EEC4BC
Magika	vba
Reporter	abuse_ch
Tags:	js RAT RemcosRAT

Intelligence

File Origin

# of uploads :

# of downloads :

Origin country :

Vendor Threat Intelligence

Verdict:

Malicious

Score:

92.5%

Link:

https://cyber-fortress.com/docs/result/index.php?id=68b54bdd3e988eb6ab8372e2

Tags:

delphi emotet

Verdict:

Malicious

Threat level:

10/10

Confidence:

100%

Tags:

anti-debug base64 dropper exploit fingerprint keylogger obfuscated obfuscated packed packed zusy

Link:

https://www.filescan.io/uploads/68b54c3b39a6221faa78408b/reports/e2ea171b-1e0d-4a78-8533-eaf19084f62a/overview

Verdict:

Malicious

Labled as:

GT:JS.Cbum.1.25F49B73;Gen:Zusy

Link:

https://www.hybrid-analysis.com/sample/a4a77ba60fd4b409707b1d363d20509eb3b4b527789eec5b6f4c874bc20576ac

Verdict:

Malicious

File Type:

First seen:

2025-08-31T18:13:00Z UTC

Last seen:

2025-08-31T18:13:00Z UTC

Hits:

~1000

Detections:

Trojan-Spy.Win32.Stealer.sb PDM:Trojan.Win32.Generic Backdoor.Win32.Remcos.sb HEUR:Trojan.Win32.Shellcode.gen Trojan-PSW.Win32.Stealer.sb Trojan-Dropper.Win32.Injector HEUR:Trojan-Spy.MSIL.Noon.gen Exploit.Win32.BypassUAC.sb Backdoor.Remcos.HTTP.C&C Trojan-Dropper.Win32.Agent.sb Trojan.JS.SAgent.sb Trojan.Win64.Zenpak.sb Backdoor.Win32.Remcos.f Backdoor.Win32.Remcos.e Trojan-Dropper.JS.SDrop.sb Trojan-Downloader.JS.Cryptoload.sb Trojan.Win32.Shellcode.sb HEUR:Trojan.Script.SAgent.gen HEUR:Trojan.Script.Generic Trojan-Spy.Win32.Xegumumune.sbc

Link:

https://opentip.kaspersky.com/a4a77ba60fd4b409707b1d363d20509eb3b4b527789eec5b6f4c874bc20576ac/results?tab=lookup

Result

Threat name:

Remcos, DBatLoader

Detection:

malicious

Classification:

rans.troj.spyw.evad

Score:

100 / 100

Link:

https://www.joesandbox.com/analysis/1768707

Signature

Allocates many large memory junks

Allocates memory in foreign processes

Antivirus / Scanner detection for submitted sample

Benign windows process drops PE files

C2 URLs / IPs found in malware configuration

Contains functionality to check if a debugger is running (CheckRemoteDebuggerPresent)

Contains functionality to register a low level keyboard hook

Contains functionality to steal Chrome passwords or cookies

Contains functionality to steal Firefox passwords or cookies

Contains functionalty to change the wallpaper

Delayed program exit found

Detected Remcos RAT

Early bird code injection technique detected

Found malware configuration

Installs a global keyboard hook

JavaScript file contains suspicious strings

Joe Sandbox ML detected suspicious sample

JScript performs obfuscated calls to suspicious functions

Malicious sample detected (through community Yara rule)

Multi AV Scanner detection for dropped file

Multi AV Scanner detection for submitted file

Queues an APC in another process (thread injection)

Sigma detected: DLL Search Order Hijackig Via Additional Space in Path

Sigma detected: Execution from Suspicious Folder

Sigma detected: Files With System Process Name In Unsuspected Locations

Sigma detected: Remcos

Sigma detected: Suspicious Creation with Colorcpl

Sigma detected: WScript or CScript Dropper

Suricata IDS alerts for network traffic

Uses ping.exe to check the status of other devices and networks

Uses ping.exe to sleep

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

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

Yara detected DBatLoader

Yara detected Remcos RAT

Behaviour

Behavior Graph:

Download SVG

Score:

97%

Verdict:

Malware

File Type:

SCRIPT

Link:

https://malprob.io/report/a4a77ba60fd4b409707b1d363d20509eb3b4b527789eec5b6f4c874bc20576ac

Gathering data

Detection:

remcos

Link:

https://mwdb.cert.pl/sample/a4a77ba60fd4b409707b1d363d20509eb3b4b527789eec5b6f4c874bc20576ac/

Verdict:

Malicious

Threat:

Family.REMCOS

Link:

https://tip.neiki.dev/file/a4a77ba60fd4b409707b1d363d20509eb3b4b527789eec5b6f4c874bc20576ac

Threat name:

Script-JS.Dropper.RemcosRAT

Status:

Malicious

First seen:

2025-09-01 02:06:19 UTC

File Type:

Text

AV detection:

17 of 36 (47.22%)

Threat level:

3/5

Detection(s):

Malicious file

Link:

https://check.spamhaus.org/check/?searchterm=ustxxjqp2s2as4d3du3d2icqt2z3jnjhpcpoyw3pjsduxqqfo2wa._file

Verdict:

malicious

Label(s):

dbatloader

Result

Malware family:

modiloader

Score:

10/10

Tags:

family:modiloader discovery execution persistence trojan

Link:

https://tria.ge/reports/250901-jdkpvscq2y/

Behaviour

Runs ping.exe

Scheduled Task/Job: Scheduled Task

Suspicious use of FindShellTrayWindow

Suspicious use of SendNotifyMessage

Suspicious use of WriteProcessMemory

Command and Scripting Interpreter: JavaScript

Enumerates physical storage devices

System Location Discovery: System Language Discovery

System Network Configuration Discovery: Internet Connection Discovery

Checks computer location settings

Executes dropped EXE

ModiLoader Second Stage

ModiLoader, DBatLoader

Modiloader family

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/a4a77ba60fd4b409707b1d363d20509eb3b4b527789eec5b6f4c874bc20576ac

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:	BitcoinAddress Create hunting rule
Author:	Didier Stevens (@DidierStevens)
Description:	Contains a valid Bitcoin address

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:	CP_AllMal_Detector Create hunting rule
Author:	DiegoAnalytics
Description:	CrossPlatform All Malwares Detector: Detect PE, ELF, Mach-O, scripts, archives; overlay, obfuscation, encryption, spoofing, hiding, high entropy, network communication

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:	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:	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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