MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 b5a19c5aa9e5d5464d59bbfe31f7afbaabe62b1a85466cedf35a5c0b0d3d7731. 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 27 File information Comments

SHA256 hash:	b5a19c5aa9e5d5464d59bbfe31f7afbaabe62b1a85466cedf35a5c0b0d3d7731
SHA3-384 hash:	c52d74986e74da96db2a3ddbbcaf6aa53c09144928ce0dbec95054c77b93784b8cd9f4930be0d71fa1474dc694d53fd9
SHA1 hash:	d02fafae73e57a3a07b5e6170e572862cf560975
MD5 hash:	3babf6dff73a3769ad5ebe89c204f971
humanhash:	august-mango-emma-mexico
File name:	Maxima_International_Sourcing.js
Download:	download sample
Signature	RemcosRAT Create hunting rule
File size:	950'414 bytes
First seen:	2026-08-26 07:52:10 UTC
Last seen:	Never
File type:	js
MIME type:	text/plain
ssdeep	12288:LDWReuV/HhwOraUQh7P4DvQ9xw/ImnUe/oTN5evXN9ISw40uY0ANeFq7i:LQeuV/+Or6cDvQk/nnUKoII0fscFr
TLSH	T139151218656019710D4CA2DCA7A37F24427EEEF14B6ED8FAD79724534B28E5F88F1E08
Magika	batch
Reporter	abuse_ch
Tags:	js RAT RemcosRAT

Intelligence

File Origin

# of uploads :

# of downloads :

182

Origin country :

Vendor Threat Intelligence

No detections

Detection(s):

SecuriteInfo.com.Trojan.Crypt.29885.14939.UNOFFICIAL

Verdict:

Malicious

Threat level:

10/10

Confidence:

100%

Tags:

cmd evasive lolbin obfuscated powershell repaired

Link:

https://www.filescan.io/uploads/6a8e9b3d9d72bfc38c5a25f6/reports/a7ca8c93-3b55-4be5-aec5-6b48fd19cabe/overview

Verdict:

Suspicious

Labled as:

JS/Agent.EWV

Link:

https://www.hybrid-analysis.com/sample/b5a19c5aa9e5d5464d59bbfe31f7afbaabe62b1a85466cedf35a5c0b0d3d7731

Verdict:

Malicious

File Type:

First seen:

2026-08-26T00:15:00Z UTC

Last seen:

2026-08-27T23:51:00Z UTC

Hits:

~100

Link:

https://opentip.kaspersky.com/b5a19c5aa9e5d5464d59bbfe31f7afbaabe62b1a85466cedf35a5c0b0d3d7731/results?tab=lookup

Result

Threat name:

Remcos

Detection:

malicious

Classification:

troj.spyw.expl.evad

Score:

100 / 100

Link:

https://www.joesandbox.com/analysis/1963901

Signature

.NET source code contains process injector

.NET source code references suspicious native API functions

Antivirus detection for URL or domain

C2 URLs / IPs found in malware configuration

Contains functionality to bypass UAC (CMSTPLUA)

Contains functionality to steal Internet Explorer form passwords

Creates a thread in another existing process (thread injection)

Detected Remcos RAT

Found malware configuration

Found suspicious powershell code related to unpacking or dynamic code loading

Injects a PE file into a foreign processes

Joe Sandbox ML detected suspicious sample

JScript performs obfuscated calls to suspicious functions

Malicious sample detected (through community Yara rule)

Maps a DLL or memory area into another process

Multi AV Scanner detection for submitted file

Overwrites code with unconditional jumps - possibly settings hooks in foreign process

Sigma detected: Dot net compiler compiles file from suspicious location

Sigma detected: Remcos

Sigma detected: WScript or CScript Dropper

Suspicious execution chain found

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

Unusual module load detection (module proxying)

Uses attrib.exe to hide files

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

Writes to foreign memory regions

WScript reads language and country specific registry keys (likely country aware script)

Wscript starts Powershell (via cmd or directly)

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/b5a19c5aa9e5d5464d59bbfe31f7afbaabe62b1a85466cedf35a5c0b0d3d7731

Gathering data

Detection:

n/a

Link:

https://mwdb.cert.pl/sample/b5a19c5aa9e5d5464d59bbfe31f7afbaabe62b1a85466cedf35a5c0b0d3d7731/

Threat name:

Win32.Trojan.Generic

Status:

Suspicious

First seen:

2026-08-26 03:37:19 UTC

File Type:

Text (Batch)

AV detection:

8 of 24 (33.33%)

Threat level:

5/5

Detection(s):

Malicious file

Link:

https://check.spamhaus.org/check/?searchterm=wwqzywvj4xkumtkzxp7dd55pxkv6mky2qvdgz3ptljoawdj5o4yq._file

Result

Malware family:

remcos

Score:

10/10

Tags:

family:remcos botnet:august collection defense_evasion discovery execution rat

Link:

https://tria.ge/reports/260826-jqnx2sal8t/

Behaviour

Suspicious behavior: EnumeratesProcesses

Suspicious behavior: MapViewOfSection

Suspicious use of AdjustPrivilegeToken

Suspicious use of SetWindowsHookEx

Suspicious use of WriteProcessMemory

Views/modifies file attributes

outlook_office_path

Command and Scripting Interpreter: JavaScript

Command and Scripting Interpreter: PowerShell

Enumerates physical storage devices

System Location Discovery: System Language Discovery

Hide Artifacts: Hidden Files and Directories

Suspicious use of SetThreadContext

Accesses Microsoft Outlook profiles

Checks computer location settings

Family: Remcos

Malware Config

C2 Extraction:

asybk.ydns.eu:2419

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/b5a19c5aa9e5d5464d59bbfe31f7afbaabe62b1a85466cedf35a5c0b0d3d7731

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:	pe_detect_tls_callbacks Create hunting rule

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

Rule name:	REMCOS_RAT_variants Create hunting rule

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

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:	telebot_framework Create hunting rule
Author:	vietdx.mb

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

Rule name:	TH_AntiVM_MassHunt_Win_Malware_2026_CYFARE Create hunting rule
Author:	CYFARE
Description:	Detects Windows malware employing anti-VM / anti-sandbox evasion techniques across VMware, VirtualBox, Hyper-V, QEMU, Xen, and generic sandbox environments
Reference:	https://cyfare.net/

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_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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