MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 4bb8d84994c3c458b01cf7bb2158420e92bdf22ab5c85125df54535c42b45f51. 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: 13


Intelligence 13 IOCs YARA 3 File information Comments
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SHA256 hash: 4bb8d84994c3c458b01cf7bb2158420e92bdf22ab5c85125df54535c42b45f51
SHA3-384 hash: a135349c35408dd06f9c2054b4d91d51e3d83243ce6329c2854f26b7348a637901fd1a5f5d60f570fe4337a8aa5ec060
SHA1 hash: 52f3055994ac3f1bed61fa44e848847d4f9874bf
MD5 hash: cbcc0f74f9e4f4bb3bd52a29cd1a6e65
humanhash: oven-stream-zebra-london
File name:PO_4653830305864846564746554847456484564848454465.js
Download: download sample
Signature RemcosRAT
Create hunting rule
File size:2'434'509 bytes
First seen:2026-06-22 06:56:24 UTC
Last seen:Never
File type:Java Script (JS) js
MIME type:text/plain
ssdeep 1536:Wu+F0Cx5rua/fg758yLmPS8C223nsnyQp+qcOtsFXbzgtsIyd5yE7iTFO2Z+0Nvw:EAh
TLSH T101B5285303851BBDF69D0EC9C94B215B20F2D46B7D251298EBB36EEBBC3B9845430636
Magika javascript
Reporter lowmal3
Tags:js RemcosRAT

Intelligence

File Origin
# of uploads :
1
# of downloads :
136
Origin country :
DE DE
Vendor Threat Intelligence
No detections
Detection(s):
SecuriteInfo.com.Trojan.GenericKD.80582231.17890.20521.UNOFFICIAL
Create hunting rule

Verdict:
Malicious
Score:
92.5%
Link:
https://cyber-fortress.com/docs/result/index.php?id=6a38dcc51548daf709f8a36b
Tags:
obfuscate xtreme shell
Verdict:
Malicious
Threat level:
  10/10
Confidence:
100%
Tags:
encrypted evasive lolbin obfuscated persistence repaired schtasks wscript
Link:
https://www.filescan.io/uploads/6a38dca290632a45f7317411/reports/3e3bf50e-d112-4b55-832f-463892d2e887/overview
Verdict:
Malicious
Labled as:
Trojan.Generic
Link:
https://www.hybrid-analysis.com/sample/4bb8d84994c3c458b01cf7bb2158420e92bdf22ab5c85125df54535c42b45f51
Verdict:
Malicious
File Type:
js
First seen:
2026-06-18T18:43:00Z UTC
Last seen:
2026-06-23T04:55:00Z UTC
Hits:
~100
Detections:
Trojan.VBS.SAgent.sb Trojan-Downloader.JS.Cryptoload.sb HEUR:Trojan.Script.Generic
Link:
https://opentip.kaspersky.com/4bb8d84994c3c458b01cf7bb2158420e92bdf22ab5c85125df54535c42b45f51/results?tab=lookup
Result
Threat name:
Remcos
Create hunting rule
Detection:
malicious
Classification:
rans.troj.spyw.expl.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/1931599
Signature
Antivirus detection for dropped file
Bypasses PowerShell execution policy
C2 URLs / IPs found in malware configuration
Contains functionality to bypass UAC (CMSTPLUA)
Contains functionality to register a low level keyboard hook
Contains functionality to steal Internet Explorer form passwords
Contains functionalty to change the wallpaper
Detected Remcos RAT
Found evasive API chain (may stop execution after reading information in the PEB, e.g. number of processors)
Found malware configuration
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 submitted file
Potential evasive JS / VBS script found (domain check)
Sigma detected: Dot net compiler compiles file from suspicious location
Sigma detected: Remcos
Sigma detected: Script Interpreter Execution From Suspicious Folder
Sigma detected: Suspicious Script Execution From Temp Folder
Sigma detected: WScript or CScript Dropper
Sigma detected: WScript or CScript Dropper - File
Suspicious execution chain found
Suspicious powershell command line found
Tries to harvest and steal browser information (history, passwords, etc)
Unusual module load detection (module proxying)
Uses schtasks.exe or at.exe to add and modify task schedules
Windows Scripting host queries suspicious COM object (likely to drop second stage)
Windows Shell Script Host drops VBS files
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
behaviorgraph top1 dnsIp2 2 Behavior Graph ID: 1931599 Sample: PO_465383030586484656474655... Startdate: 22/06/2026 Architecture: WINDOWS Score: 100 73 pki-goog.l.google.com 2->73 75 mr-b01.tm-azurefd.net 2->75 77 3 other IPs or domains 2->77 81 Found malware configuration 2->81 83 Malicious sample detected (through community Yara rule) 2->83 85 Antivirus detection for dropped file 2->85 87 11 other signatures 2->87 10 wscript.exe 1 7 2->10         started        14 wscript.exe 1 2->14         started        signatures3 process4 file5 63 C:\Users\user\AppData\...\dat_87841_24ec, ASCII 10->63 dropped 65 C:\Users\user\AppData\...\Task_12775.xml, XML 10->65 dropped 67 C:\Users\user\AppData\...\PhotoStudio.vbs, ASCII 10->67 dropped 69 C:\Users\user\AppData\...\PhotoStudio.js, ASCII 10->69 dropped 105 JScript performs obfuscated calls to suspicious functions 10->105 107 Suspicious powershell command line found 10->107 109 Wscript starts Powershell (via cmd or directly) 10->109 113 6 other signatures 10->113 16 powershell.exe 10->16         started        18 schtasks.exe 1 10->18         started        111 WScript reads language and country specific registry keys (likely country aware script) 14->111 20 wscript.exe 3 14->20         started        signatures6 process7 file8 24 MSBuild.exe 4 3 16->24         started        29 csc.exe 3 16->29         started        31 conhost.exe 16->31         started        33 conhost.exe 18->33         started        53 C:\Users\user\AppData\...\tmp_72037_827b, ASCII 20->53 dropped 89 Suspicious powershell command line found 20->89 91 Wscript starts Powershell (via cmd or directly) 20->91 93 WScript reads language and country specific registry keys (likely country aware script) 20->93 35 powershell.exe 20->35         started        37 schtasks.exe 1 20->37         started        signatures9 process10 dnsIp11 79 107.173.4.16, 2561, 49704, 49705 AS-COLOCROSSING-HostPapaUS United States 24->79 55 C:\Users\user\AppData\...\Login Data.tmp, SQLite 24->55 dropped 57 C:\Users\user\AppData\...\Login Data.tmp, SQLite 24->57 dropped 59 C:\Users\user\...\Login Data For Account.tmp, SQLite 24->59 dropped 97 Contains functionality to bypass UAC (CMSTPLUA) 24->97 99 Detected Remcos RAT 24->99 101 Contains functionalty to change the wallpaper 24->101 103 5 other signatures 24->103 61 C:\Users\user\AppData\Local\...\iolle5xv.dll, PE32 29->61 dropped 39 cvtres.exe 1 29->39         started        41 MSBuild.exe 35->41         started        44 csc.exe 3 35->44         started        47 conhost.exe 35->47         started        49 conhost.exe 37->49         started        file12 signatures13 process14 file15 95 Detected Remcos RAT 41->95 71 C:\Users\user\AppData\Local\...\oyodsrnw.dll, PE32 44->71 dropped 51 cvtres.exe 1 44->51         started        signatures16 process17
Score:
100%
Verdict:
Malware
File Type:
SCRIPT
Link:
https://malprob.io/report/4bb8d84994c3c458b01cf7bb2158420e92bdf22ab5c85125df54535c42b45f51
Gathering data
Detection:
remcos
Create hunting rule
Link:
https://mwdb.cert.pl/sample/4bb8d84994c3c458b01cf7bb2158420e92bdf22ab5c85125df54535c42b45f51/
Verdict:
Malicious
Threat:
Family.REMCOS
Link:
https://tip.neiki.dev/file/4bb8d84994c3c458b01cf7bb2158420e92bdf22ab5c85125df54535c42b45f51
Threat name:
Script-JS.Packed.Generic
Create hunting rule
Status:
Suspicious
First seen:
2026-06-19 07:39:21 UTC
File Type:
Text (JavaScript)
AV detection:
10 of 24 (41.67%)
Threat level:
  1/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=jo4nqsmuypcfrma4665scwccb2jl34rkwxefcjo7krjvyqvul5iq._file
Result
Malware family:
remcos
Create hunting rule
Score:
  10/10
Tags:
family:remcos botnet:2026 collection defense_evasion discovery execution persistence rat trojan
Link:
https://tria.ge/reports/260622-hqpc5shz2r/
Behaviour
Scheduled Task/Job: Scheduled Task
Suspicious behavior: EnumeratesProcesses
Suspicious behavior: GetForegroundWindowSpam
Suspicious use of AdjustPrivilegeToken
Suspicious use of WriteProcessMemory
Uses Task Scheduler COM API
outlook_office_path
Command and Scripting Interpreter: JavaScript
Enumerates physical storage devices
System Location Discovery: System Language Discovery
Suspicious use of SetThreadContext
Accesses Microsoft Outlook profiles
Checks computer location settings
Command and Scripting Interpreter: PowerShell
Family: Remcos
UAC bypass
Malware Config
C2 Extraction:
107.173.4.16:2561
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/4bb8d84994c3c458b01cf7bb2158420e92bdf22ab5c85125df54535c42b45f51

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:ClamAV_Emotet_String_Aggregate
Create hunting rule
Rule name:DetectEncryptedVariants
Create hunting rule
Author:Zinyth
Description:Detects 'encrypted' in ASCII, Unicode, base64, or hex-encoded
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)

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 4bb8d84994c3c458b01cf7bb2158420e92bdf22ab5c85125df54535c42b45f51

(this sample)

  
Delivery method
Distributed via e-mail attachment

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