MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 ef62a120aab5859853bd3bf196981530f958b18a18d122773e2defe890edd787. 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 1 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: ef62a120aab5859853bd3bf196981530f958b18a18d122773e2defe890edd787
SHA3-384 hash: 8c521c1f88ebcfbcc2d700e010348d05e9142d1f20b94fa1fd05f1ad624f5e9042c057a340c338fe8f8314601840150a
SHA1 hash: a88fe880502543a46e0d7791dbccac5208cc5248
MD5 hash: b255aae1f53eda77f20fa82c75012fac
humanhash: autumn-avocado-apart-echo
File name:CopilotDrivers.js
Download: download sample
Signature RemcosRAT
Create hunting rule
File size:1'100'395 bytes
First seen:2025-08-12 07:28:23 UTC
Last seen:Never
File type:Java Script (JS) js
MIME type:text/plain
ssdeep 1536:C0PedpnhdCoEETMrR8oySHmv0NCqP6+krOuneUE4Lcf6gg83t/hjwWqeqDAZa00v:e
TLSH T196356EB3210941E6AA3A4F978B5FD4CE918503128775F5F5CB23DC69D29EE40B1B8B38
Magika javascript
Reporter abuse_ch
Tags:js RAT RemcosRAT

Intelligence

File Origin
# of uploads :
1
# of downloads :
78
Origin country :
SE SE
Vendor Threat Intelligence
Verdict:
Malicious
Score:
93.3%
Link:
https://cyber-fortress.com/docs/result/index.php?id=689aed29fca70bd90e8eb919
Tags:
xtreme shell sage
Verdict:
Malicious
Threat level:
  10/10
Confidence:
100%
Tags:
obfuscated powershell
Link:
https://www.filescan.io/uploads/689aed8a9ef4d2ff7cf7d8d2/reports/fd7449cb-4f60-452c-8704-5aabd8582444/overview
Verdict:
Malicious
Labled as:
Trojan.Script.Heuristic
Link:
https://www.hybrid-analysis.com/sample/ef62a120aab5859853bd3bf196981530f958b18a18d122773e2defe890edd787
Result
Threat name:
n/a
Detection:
malicious
Classification:
expl.evad
Score:
88 / 100
Link:
https://www.joesandbox.com/analysis/1755117
Signature
Bypasses PowerShell execution policy
Joe Sandbox ML detected suspicious sample
JScript performs obfuscated calls to suspicious functions
Multi AV Scanner detection for submitted file
Sigma detected: PowerShell Base64 Encoded IEX Cmdlet
Sigma detected: WScript or CScript Dropper
Suspicious execution chain found
Suspicious powershell command line found
Windows Scripting host queries suspicious COM object (likely to drop second stage)
Wscript starts Powershell (via cmd or directly)
Behaviour
Behavior Graph:
Download SVG
Score:
36%
Verdict:
Susipicious
File Type:
SCRIPT
Link:
https://malprob.io/report/ef62a120aab5859853bd3bf196981530f958b18a18d122773e2defe890edd787
Gathering data
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/ef62a120aab5859853bd3bf196981530f958b18a18d122773e2defe890edd787/
Threat name:
Win32.Trojan.Generic
Create hunting rule
Status:
Suspicious
First seen:
2025-08-12 01:56:01 UTC
File Type:
Text (JavaScript)
AV detection:
7 of 24 (29.17%)
Threat level:
  5/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=55rkcifkwwczqu55hpyzngavgd4vrmmkddise5z6fxx6rehn26dq._file
Result
Malware family:
n/a
Score:
  8/10
Tags:
execution
Link:
https://tria.ge/reports/250812-jb1cjawpx3/
Behaviour
Suspicious behavior: EnumeratesProcesses
Suspicious use of AdjustPrivilegeToken
Suspicious use of WriteProcessMemory
Command and Scripting Interpreter: JavaScript
Enumerates physical storage devices
Command and Scripting Interpreter: PowerShell
Checks computer location settings
Blocklisted process makes network request
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/ef62a120aab5859853bd3bf196981530f958b18a18d122773e2defe890edd787

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: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.

Web download

RemcosRAT

Java Script (JS) js ef62a120aab5859853bd3bf196981530f958b18a18d122773e2defe890edd787

(this sample)

  
URLhaus
https://urlhaus.abuse.ch/url/3597686/
  
Delivery method
Distributed via web download

BLint

The following table provides more information about this file using BLint. BLint is a Binary Linter to check the security properties, and capabilities in executables.

Findings
IDTitleSeverity
CHECK_AUTHENTICODEMissing Authenticodehigh
CHECK_DLL_CHARACTERISTICSMissing dll Security Characteristics (GUARD_CF)high
Reviews
IDCapabilitiesEvidence
WIN32_PROCESS_APICan Create Process and ThreadsKERNEL32.dll::CloseHandle
KERNEL32.dll::CreateThread
WIN_BASE_APIUses Win Base APIKERNEL32.dll::TerminateProcess
KERNEL32.dll::LoadLibraryExW
KERNEL32.dll::GetStartupInfoW
KERNEL32.dll::GetCommandLineA
KERNEL32.dll::GetCommandLineW
WIN_BASE_EXEC_APICan Execute other programsKERNEL32.dll::WriteConsoleW
KERNEL32.dll::FreeConsole
KERNEL32.dll::ReadConsoleW
KERNEL32.dll::SetStdHandle
KERNEL32.dll::GetConsoleMode
KERNEL32.dll::GetConsoleOutputCP
WIN_BASE_IO_APICan Create FilesKERNEL32.dll::CreateFileW
WIN_USER_APIPerforms GUI ActionsUSER32.dll::EmptyClipboard
USER32.dll::OpenClipboard
USER32.dll::CreateWindowExW

Comments