MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 b3bb0f051096210a71a558cd6d24f577e5e8b2066a99ffebb8ed5f71d1e9e888. 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: 9


Intelligence 9 IOCs YARA 20 File information Comments
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SHA256 hash: b3bb0f051096210a71a558cd6d24f577e5e8b2066a99ffebb8ed5f71d1e9e888
SHA3-384 hash: 4ec6d6ad3e4b07c4eab027811fe86c380e1723d21be629d71d1a60497e8782a852ffb1d08a024b44e3d80dc54b5e975a
SHA1 hash: b6673eea4cb4fe013bef444b5d518bcc66cb73e9
MD5 hash: 17faa242e9cee0add62999f2cc7c08e9
humanhash: pip-mike-hot-cat
File name:HSBC Bank_ Payment Swift MT103_Copy.pdf.JS
Download: download sample
Signature RemcosRAT
Create hunting rule
File size:6'562'633 bytes
First seen:2025-12-03 13:55:34 UTC
Last seen:Never
File type:Java Script (JS) js
MIME type:text/plain
ssdeep 49152:01zb4VCQMoWxjrYUkAJ7XhEBA2tbK7LZ5+bWr4cs4aVBsqLK/P9IgfY6+Jon2AlX:EF5J7XhEBAWbKf0es/gNYUlTB6ul
TLSH T13B66C75914E810A3D5667DF69F3E6E608C0E2E1324D22C1B342A7E9F34ADD99D620D3F
Magika javascript
Reporter abuse_ch
Tags:HSBC js RAT RemcosRAT

Intelligence

File Origin
# of uploads :
1
# of downloads :
97
Origin country :
SE SE
Vendor Threat Intelligence
No detections
Verdict:
Clean
Score:
82.2%
Link:
https://cyber-fortress.com/docs/result/index.php?id=6930418416e6db515e46474b
Tags:
n/a
Verdict:
Malicious
Threat level:
  10/10
Confidence:
100%
Tags:
anti-debug autoit dropper evasive expired-cert fingerprint keylogger masquerade obfuscated repaired
Link:
https://www.filescan.io/uploads/69304181ddcd694c78ba831b/reports/881ace5b-12f6-4d4d-96de-041cbc04c0d1/overview
Verdict:
Unknown
Link:
https://www.hybrid-analysis.com/sample/b3bb0f051096210a71a558cd6d24f577e5e8b2066a99ffebb8ed5f71d1e9e888
Verdict:
Malicious
File Type:
js
First seen:
2025-12-02T19:48:00Z UTC
Last seen:
2025-12-05T10:47:00Z UTC
Hits:
~100
Link:
https://opentip.kaspersky.com/b3bb0f051096210a71a558cd6d24f577e5e8b2066a99ffebb8ed5f71d1e9e888/results?tab=lookup
Result
Threat name:
Remcos, DonutLoader
Create hunting rule
Detection:
malicious
Classification:
troj.expl.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/1825421
Signature
Allocates memory in foreign processes
C2 URLs / IPs found in malware configuration
Creates a thread in another existing process (thread injection)
Detected Remcos RAT
Found malware configuration
JavaScript source code contains functionality to generate code involving a shell, file or stream
Joe Sandbox ML detected suspicious sample
Malicious sample detected (through community Yara rule)
Sigma detected: Execution from Suspicious Folder
Sigma detected: Remcos
Sigma detected: Suspicious Parent Double Extension File Execution
Sigma detected: Windows Shell/Scripting Application File Write to Suspicious Folder
Sigma detected: WScript or CScript Dropper
Suricata IDS alerts for network traffic
Unusual module load detection (module proxying)
Uses an obfuscated file name to hide its real file extension (double extension)
Windows Scripting host queries suspicious COM object (likely to drop second stage)
Writes to foreign memory regions
Yara detected DonutLoader
Yara detected Remcos RAT
Yara detected UAC Bypass using CMSTP
Behaviour
Behavior Graph:
Download SVG
Score:
100%
Verdict:
Malware
File Type:
SCRIPT
Link:
https://malprob.io/report/b3bb0f051096210a71a558cd6d24f577e5e8b2066a99ffebb8ed5f71d1e9e888
Gathering data
Detection:
remcos
Create hunting rule
Link:
https://mwdb.cert.pl/sample/b3bb0f051096210a71a558cd6d24f577e5e8b2066a99ffebb8ed5f71d1e9e888/
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=wo5q6biqsyqqu4nfldgw2jhvo7s6rmqgnkm7725y5vpxdupj5cea._file
Verdict:
malicious
Label(s):
remcos
Create hunting rule
Similar samples:
error
RemcosRAT
Result
Malware family:
donutloader
Create hunting rule
Score:
  10/10
Tags:
family:donutloader discovery execution loader
Link:
https://tria.ge/reports/251203-q8ssaacp7s/
Behaviour
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
Checks computer location settings
Executes dropped EXE
Detects DonutLoader
DonutLoader
Donutloader family
Please note that we are no longer able to provide a coverage score for Virus Total.
Threat name:
Legit
Score:
0.00
Link:
https://yomi.yoroi.company/submissions/b3bb0f051096210a71a558cd6d24f577e5e8b2066a99ffebb8ed5f71d1e9e888

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: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_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_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: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.

Comments