MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 21acfb3fb5b04aa94e2ae1fb052150cfabaa2a717fcc3f3f1ed65c1fc027b8e6. 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 26 File information Comments
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SHA256 hash: 21acfb3fb5b04aa94e2ae1fb052150cfabaa2a717fcc3f3f1ed65c1fc027b8e6
SHA3-384 hash: 6bd1ceabec7a79847b328d9cef5f433179a5324d6826f5ac4997501a002a3f9b5f29e4d84037c51d9821ae86fa1260c7
SHA1 hash: 5ccf978b9840dfbfc619fb12f9177cd0f35ee835
MD5 hash: 581bd9b179ecf5882b52f755975186af
humanhash: pip-sierra-utah-delta
File name:FedEx_Custom_doc.js
Download: download sample
Signature RemcosRAT
Create hunting rule
File size:17'436'750 bytes
First seen:2026-06-23 08:02:03 UTC
Last seen:Never
File type:Java Script (JS) js
MIME type:text/plain
ssdeep 384:147DJY0EuaorGQhBRkdWeMH5c1dGAc5Urk8bArsUA4J23v2V3l7mwtWH+vTDTxyZ:c75hmS8Wf25
Threatray 91 similar samples on MalwareBazaar
TLSH T115073E8201A9C02BEEFDE80E581E0BF23CEC9A658F5CC63DDE026857AFD79405553B95
TrID 66.6% (.TXT) Text - UTF-16 (LE) encoded (2000/1)
33.3% (.MP3) MP3 audio (1000/1)
Magika vba
Reporter abuse_ch
Tags:FedEx js RAT RemcosRAT

Intelligence

File Origin
# of uploads :
1
# of downloads :
154
Origin country :
SE SE
Vendor Threat Intelligence
No detections
Verdict:
Malicious
Score:
94.9%
Link:
https://cyber-fortress.com/docs/result/index.php?id=6a3a3e1c86bc95245bf8d635
Tags:
autorun cobalt
Verdict:
Suspicious
Threat level:
  5/10
Confidence:
100%
Tags:
masquerade repaired
Link:
https://www.filescan.io/uploads/6a3a3dab4dca8c24a5962e09/reports/0c53d5d3-a75b-4789-966d-4c4ea11a431f/overview
Verdict:
Suspicious
Labled as:
JS/TrojanDownloader.Agent
Link:
https://www.hybrid-analysis.com/sample/21acfb3fb5b04aa94e2ae1fb052150cfabaa2a717fcc3f3f1ed65c1fc027b8e6
Verdict:
Malicious
File Type:
js
First seen:
2026-06-23T00:21:00Z UTC
Last seen:
2026-06-25T05:03:00Z UTC
Hits:
~1000
Detections:
Trojan-Downloader.MSIL.Seraph.d PDM:Trojan.Win32.Generic HEUR:Trojan.VBS.Agent.gen HEUR:Trojan-Downloader.Script.Generic HEUR:Trojan.Script.Generic Trojan.MSIL.Crypt.sb Trojan-Downloader.MSIL.Agent.c PDM:Exploit.Win32.Generic HEUR:Trojan.Script.Startup.gen Trojan.VBS.SAgent.sb Trojan.JS.SAgent.sb
Link:
https://opentip.kaspersky.com/21acfb3fb5b04aa94e2ae1fb052150cfabaa2a717fcc3f3f1ed65c1fc027b8e6/results?tab=lookup
Result
Threat name:
Remcos
Create hunting rule
Detection:
malicious
Classification:
troj.spyw.expl.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/1932425
Signature
Attempt to bypass Chrome Application-Bound Encryption
Bypasses PowerShell execution policy
C2 URLs / IPs found in malware configuration
Contains functionality to bypass UAC (CMSTPLUA)
Contains functionality to check if a debugger is running (CheckRemoteDebuggerPresent)
Contains functionality to inject threads in other processes
Contains functionality to steal Internet Explorer form passwords
Creates processes via WMI
Detected large data written to user environment variables, potentially indicating payload staging for fileless execution
Detected Remcos RAT
Drops script or batch files to the startup folder
Found hidden mapped module (file has been removed from disk)
Found malware configuration
Injects a PE file into a foreign processes
Joe Sandbox ML detected suspicious sample
Malicious sample detected (through community Yara rule)
Modifies the context of a thread in another process (thread injection)
Sigma detected: Base64 Encoded PowerShell Command Detected
Sigma detected: Drops script at startup location
Sigma detected: Potential Data Stealing Via Chromium Headless Debugging
Sigma detected: PowerShell Base64 Encoded FromBase64String Cmdlet
Sigma detected: Remcos
Sigma detected: Suspicious Environment Variable Has Been Registered
Sigma detected: WScript or CScript Dropper
Suricata IDS alerts for network traffic
Suspicious execution chain found
Suspicious powershell command line found
Switches to a custom stack to bypass stack traces
Tries to detect sandboxes / dynamic malware analysis system (Installed program check)
Tries to harvest and steal browser information (history, passwords, etc)
Tries to steal Mail credentials (via file registry)
Unusual module load detection (module proxying)
Windows Scripting host queries suspicious COM object (likely to drop second stage)
Writes to foreign memory regions
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: 1932425 Sample: FedEx_Custom_doc.js Startdate: 23/06/2026 Architecture: WINDOWS Score: 100 50 resc.cloudinary.com.cdn.cloudflare.net 2->50 52 res.cloudinary.com 2->52 54 6 other IPs or domains 2->54 62 Suricata IDS alerts for network traffic 2->62 64 Found malware configuration 2->64 66 Malicious sample detected (through community Yara rule) 2->66 68 13 other signatures 2->68 9 powershell.exe 14 15 2->9         started        13 wscript.exe 13 3 2->13         started        16 wscript.exe 1 2->16         started        signatures3 process4 dnsIp5 60 resc.cloudinary.com.cdn.cloudflare.net 104.16.79.6, 443, 49707, 49711 CLOUDFLARENET-CloudflareIncUS Canada 9->60 84 Writes to foreign memory regions 9->84 86 Modifies the context of a thread in another process (thread injection) 9->86 88 Injects a PE file into a foreign processes 9->88 90 Contains functionality to check if a debugger is running (CheckRemoteDebuggerPresent) 9->90 18 MSBuild.exe 5 10 9->18         started        23 conhost.exe 9->23         started        48 C:\Users\user\AppData\...\FedEx_Custom_doc.js, Unicode 13->48 dropped 92 Suspicious powershell command line found 13->92 94 Wscript starts Powershell (via cmd or directly) 13->94 96 Drops script or batch files to the startup folder 13->96 98 4 other signatures 13->98 25 powershell.exe 16->25         started        file6 signatures7 process8 dnsIp9 56 64.89.160.69, 49708, 49709, 49710 GHOSTYNETWORKSUS Luxembourg 18->56 58 127.0.0.1 unknown unknown 18->58 40 C:\Users\user\AppData\...\cookies.sqlite-shm, data 18->40 dropped 42 C:\Users\user\AppData\...\Login Data.tmp, SQLite 18->42 dropped 44 C:\Users\user\AppData\...\Login Data.tmp, SQLite 18->44 dropped 46 2 other files (1 malicious) 18->46 dropped 70 Contains functionality to bypass UAC (CMSTPLUA) 18->70 72 Detected Remcos RAT 18->72 74 Attempt to bypass Chrome Application-Bound Encryption 18->74 82 8 other signatures 18->82 27 msedge.exe 7 18->27         started        29 chrome.exe 1 18->29         started        76 Writes to foreign memory regions 25->76 78 Modifies the context of a thread in another process (thread injection) 25->78 80 Injects a PE file into a foreign processes 25->80 31 MSBuild.exe 1 25->31         started        34 conhost.exe 25->34         started        file10 signatures11 process12 signatures13 36 msedge.exe 27->36         started        38 conhost.exe 29->38         started        100 Tries to harvest and steal browser information (history, passwords, etc) 31->100 process14
Gathering data
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/21acfb3fb5b04aa94e2ae1fb052150cfabaa2a717fcc3f3f1ed65c1fc027b8e6/
Verdict:
Malicious
Threat:
Family.REMCOSRAT
Link:
https://tip.neiki.dev/file/21acfb3fb5b04aa94e2ae1fb052150cfabaa2a717fcc3f3f1ed65c1fc027b8e6
Threat name:
Win32.Trojan.Kepavll
Create hunting rule
Status:
Malicious
First seen:
2026-06-23 03:36:02 UTC
File Type:
Binary
AV detection:
4 of 24 (16.67%)
Threat level:
  5/5
Detection(s):
Malicious file
Link:
https://check.spamhaus.org/check/?searchterm=egwpwp5vwbfkstrk4h5qkikqz6v2uktrp7gd6py62zob7qbhxdta._file
Verdict:
malicious
Label(s):
remcos
Create hunting rule
Similar samples:
18e34b3552499ece851a3e979f4723cad587fc371f14f6ae341b498d57f56cd4
RemcosRAT
6ff16b812dcb39404b71dbbeb517d28006303681189187b3db0f43c592c57a5d
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77dccc5455aac4c8114326446ca1605300db691e379027c0d286f1c44035fa81
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8179cdb2ab4bc2968e9c92bea71e015cbaf79c582a52c6772fd853b61a702e72
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919d18568ebd2cdcde7aeb972d0ba2f8fc0596d5fc7b00d35071f131a8e5011d
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b7317e5c11023c625bb77d6e6eac0b585e51d041ea039d2c0285c8f548b88d11
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bd34f9019cdc446b263f2a0eee5dcdb9646fd2d6fe37ac90243982705d44b0fd
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e252cd399ca7d1102917946ea9cbd9cf4e9d03bf0180d26a43946cafc4b7acb4
RemcosRAT
error
RemcosRAT
+ 81 additional samples on MalwareBazaar
Result
Malware family:
remcos
Create hunting rule
Score:
  10/10
Tags:
family:remcos botnet:remote collection credential_access discovery execution rat stealer
Link:
https://tria.ge/reports/260623-jxvn6sa19j/
Behaviour
Suspicious behavior: EnumeratesProcesses
Suspicious behavior: NtCreateUserProcessBlockNonMicrosoftBinary
Suspicious use of AdjustPrivilegeToken
Suspicious use of FindShellTrayWindow
Suspicious use of WriteProcessMemory
outlook_office_path
Checks processor information in registry
Enumerates system info in registry
Modifies data under HKEY_USERS
Modifies registry class
Browser Information Discovery
Command and Scripting Interpreter: JavaScript
Enumerates physical storage devices
System Time Discovery
Drops file in Program Files directory
Suspicious use of SetThreadContext
Accesses Microsoft Outlook profiles
Drops startup file
Badlisted process makes network request
Command and Scripting Interpreter: PowerShell
Uses browser remote debugging
Family: Remcos
Process spawned unexpected child process
Malware Config
C2 Extraction:
64.89.160.69:8080
Malware family:
Remcos
Create hunting rule
Verdict:
Malicious
Link:
https://www.vmray.com/analyses/_mb/21acfb3fb5b0/report/overview.html
Please note that we are no longer able to provide a coverage score for Virus Total.
Threat name:
Suspicious File
Score:
0.51
Link:
https://yomi.yoroi.company/submissions/21acfb3fb5b04aa94e2ae1fb052150cfabaa2a717fcc3f3f1ed65c1fc027b8e6

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:Check_OutputDebugStringA_iat
Create hunting rule
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:DebuggerCheck__QueryInfo
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_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_SQLQuery_ConfidentialDataStore
Create hunting rule
Author:ditekSHen
Description:Detects executables containing SQL queries to confidential data stores. Observed in infostealers
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:NET
Create hunting rule
Author:malware-lu
Rule name:pe_detect_tls_callbacks
Create hunting rule
Rule name:RANSOMWARE
Create hunting rule
Author:ToroGuitar
Rule name:Remcos_unpacked_PulseIntel
Create hunting rule
Author:PulseIntel
Description:Remcos Payload
Rule name:Sus_All_Windows_PE_Malware
Create hunting rule
Author:DiegoAnalytics
Description:Detects Windows PE malware of all types, avoids non-executables like .html
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: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_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:WIN_WebSocket_Base64_C2_20250726
Create hunting rule
Author:dogsafetyforeverone
Description:Detects configuration strings used by malware to specify WebSocket command-and-control endpoints inside Base64-encoded data. It looks for prefixes such as '#ws://' or '#wss://' that were found in QuasarRAT configuration data.
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