MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 e8551dd43a0e961e75bfe1ee46bab0c822f181d901da89744e745dc1e66b507c. 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 20 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: e8551dd43a0e961e75bfe1ee46bab0c822f181d901da89744e745dc1e66b507c
SHA3-384 hash: c832780ac489933a6db7efe2af622cec4a53eb31d1245403d1fac2a2ae2776bbc591cdab9575d62805049b18fdc549d8
SHA1 hash: aea4f76661f96aec50acaef5f6b84fe322ae0ca9
MD5 hash: bf1e2a8988fdf8e71eefb7ef4a3e876f
humanhash: six-failed-pasta-april
File name:Avviso di Pagamento Banca_MPS.pdf.JS
Download: download sample
Signature RemcosRAT
Create hunting rule
File size:5'774'791 bytes
First seen:2025-12-10 12:59:49 UTC
Last seen:Never
File type:Java Script (JS) js
MIME type:text/plain
ssdeep 49152:Q33v/4rKl3FvKW5FgyZzn/xgX+sBMQn8xEyhymOCEQy8bEnqXL8PYtsAYpG:SFvKW5Fzt/xgusBMQUEKyKm8LOosdG
TLSH T1E146B55D66E96027D801BAFC5F2D57A1AF4A1D1B2AD6380E33753ECB327CC849422F64
Magika javascript
Reporter lowmal3
Tags:js RemcosRAT

Intelligence

File Origin
# of uploads :
1
# of downloads :
128
Origin country :
DE DE
Vendor Threat Intelligence
No detections
Verdict:
Malicious
Score:
92.5%
Link:
https://cyber-fortress.com/docs/result/index.php?id=69396efcbde6a3e5970fd93a
Tags:
autoit emotet lien
Verdict:
Malicious
Threat level:
  10/10
Confidence:
100%
Tags:
anti-debug autoit dropper evasive expired-cert fingerprint keylogger obfuscated repaired
Link:
https://www.filescan.io/uploads/69396eee1eac7b9b76a3c638/reports/79e793eb-7f74-46ae-ab13-8066c9624fe4/overview
Verdict:
Unknown
Link:
https://www.hybrid-analysis.com/sample/e8551dd43a0e961e75bfe1ee46bab0c822f181d901da89744e745dc1e66b507c
Verdict:
Malicious
File Type:
js
First seen:
2025-12-08T10:16:00Z UTC
Last seen:
2025-12-12T11:14:00Z UTC
Hits:
~1000
Detections:
Backdoor.Win32.Remcos.sb Trojan.Win32.Shellcode.sb HEUR:Trojan-Dropper.Script.Generic HEUR:Trojan.Win64.Donut.a HEUR:Trojan.Multi.Donut.b Trojan-Dropper.Win32.Injector.qcik HEUR:Trojan-Downloader.Script.Generic BSS:Trojan.Win32.Generic HEUR:Trojan.Script.Generic Trojan-PSW.Win32.Stealer.sb Trojan-Downloader.JS.Cryptoload.sb not-a-virus:HEUR:PSWTool.Win32.PassView.c not-a-virus:HEUR:PSWTool.Win32.PassView.a not-a-virus:HEUR:PSWTool.Win32.PassView.b
Link:
https://opentip.kaspersky.com/e8551dd43a0e961e75bfe1ee46bab0c822f181d901da89744e745dc1e66b507c/results?tab=lookup
Result
Threat name:
Remcos, DonutLoader
Create hunting rule
Detection:
malicious
Classification:
phis.troj.spyw.expl.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/1830205
Signature
Allocates memory in foreign processes
Antivirus detection for dropped file
C2 URLs / IPs found in malware configuration
Creates a thread in another existing process (thread injection)
Detected Remcos RAT
Found hidden mapped module (file has been removed from disk)
Found malware configuration
JavaScript source code contains functionality to create an Office document
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)
Maps a DLL or memory area into another process
Multi AV Scanner detection for dropped file
Sigma detected: Execution from Suspicious Folder
Sigma detected: Remcos
Sigma detected: Suspicious Creation with Colorcpl
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
Switches to a custom stack to bypass stack traces
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)
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
behaviorgraph top1 signatures2 2 Behavior Graph ID: 1830205 Sample: Avviso di Pagamento Banca_M... Startdate: 10/12/2025 Architecture: WINDOWS Score: 100 44 Suricata IDS alerts for network traffic 2->44 46 Found malware configuration 2->46 48 Malicious sample detected (through community Yara rule) 2->48 50 16 other signatures 2->50 8 wscript.exe 1 4 2->8         started        process3 signatures4 62 Windows Scripting host queries suspicious COM object (likely to drop second stage) 8->62 11 BYQPMLMWPBZLAVHOCQLSOIPGCXVCXTITHHYAVOBVNQJLVRJJEKZSJHE.exe 8->11         started        process5 signatures6 64 Writes to foreign memory regions 11->64 66 Allocates memory in foreign processes 11->66 68 Creates a thread in another existing process (thread injection) 11->68 14 colorcpl.exe 6 3 11->14         started        process7 dnsIp8 34 91.92.243.134, 49694, 49695, 9672 THEZONEBG Bulgaria 14->34 28 C:\Users\user\AppData\Local\Temp\TH9B70.tmp, MS-DOS 14->28 dropped 30 C:\Users\user\AppData\Local\Temp\TH9B30.tmp, MS-DOS 14->30 dropped 32 C:\Users\user\AppData\Local\Temp\TH9B1F.tmp, MS-DOS 14->32 dropped 36 Detected Remcos RAT 14->36 38 Writes to foreign memory regions 14->38 40 Found hidden mapped module (file has been removed from disk) 14->40 42 3 other signatures 14->42 19 RmClient.exe 2 14->19         started        22 RmClient.exe 1 14->22         started        24 RmClient.exe 1 14->24         started        26 RmClient.exe 14->26         started        file9 signatures10 process11 signatures12 52 Tries to steal Mail credentials (via file registry) 19->52 54 Tries to harvest and steal browser information (history, passwords, etc) 19->54 56 Unusual module load detection (module proxying) 19->56 58 Tries to steal Instant Messenger accounts or passwords 22->58 60 Tries to steal Mail credentials (via file / registry access) 22->60
Gathering data
Detection:
remcos
Create hunting rule
Link:
https://mwdb.cert.pl/sample/e8551dd43a0e961e75bfe1ee46bab0c822f181d901da89744e745dc1e66b507c/
Verdict:
Malicious
Threat:
Family.REMCOS
Link:
https://tip.neiki.dev/file/e8551dd43a0e961e75bfe1ee46bab0c822f181d901da89744e745dc1e66b507c
Threat name:
Script-JS.Trojan.Generic
Create hunting rule
Status:
Suspicious
First seen:
2025-12-10 13:20:40 UTC
File Type:
Binary
AV detection:
4 of 24 (16.67%)
Threat level:
  5/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=5bkr3vb2b2lb45n74hxenovqzarpdaozahnis5cooro4dztlkb6a._file
Verdict:
malicious
Label(s):
remcos
Create hunting rule
admintool_mailpassview
Create hunting rule
nirsoft
Create hunting rule
Similar samples:
error
RemcosRAT
Result
Malware family:
donutloader
Create hunting rule
Score:
  10/10
Tags:
family:donutloader collection discovery execution loader
Link:
https://tria.ge/reports/251210-p8ysvsxpbl/
Behaviour
Suspicious behavior: EnumeratesProcesses
Suspicious use of AdjustPrivilegeToken
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
Suspicious use of SetThreadContext
Accesses Microsoft Outlook accounts
Checks computer location settings
Executes dropped EXE
Detected Nirsoft tools
NirSoft MailPassView
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/e8551dd43a0e961e75bfe1ee46bab0c822f181d901da89744e745dc1e66b507c

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.

Malspam

RemcosRAT

Java Script (JS) js e8551dd43a0e961e75bfe1ee46bab0c822f181d901da89744e745dc1e66b507c

(this sample)

  
Delivery method
Distributed via e-mail attachment

Comments