MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 3937e4805c217565c9ad28b7a99d8f1cdef327c8ddeaa864927db72ca3daea09. 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: 8


Intelligence 8 IOCs YARA 28 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: 3937e4805c217565c9ad28b7a99d8f1cdef327c8ddeaa864927db72ca3daea09
SHA3-384 hash: e8ab334e635f92e6c78b0aec77bb4779968d1f3f0e3db2b71abdf34142457cb43b5804ca95609078178713c0b9bcce9b
SHA1 hash: ca8d58cc6fc7455e36fcb65820dc4552422c2202
MD5 hash: a40ab7c1031e7d361ab47811344d9403
humanhash: april-helium-echo-video
File name:PURCHASE ORDER-2025-110010_xls.arj
Download: download sample
Signature RemcosRAT
Create hunting rule
File size:793'268 bytes
First seen:2025-11-12 14:05:29 UTC
Last seen:Never
File type: arj
MIME type:application/x-rar
ssdeep 12288:sVMazJMMR8AoZDyX7hjfYj532/xlzcgMAXfCdW7idCl4cvBKDDEEuYMN5hjBRGMp:UzJMhhFuatm/QyXD7iElr5G1UpB9r
TLSH T1C4F43383B1E0D682EA87753B177DF5AC06C4AC2436F814F8FE8BEB88A121537847D591
TrID 61.5% (.RAR) RAR compressed archive (v5.0) (8000/1)
38.4% (.RAR) RAR compressed archive (gen) (5000/1)
Magika rar
Reporter cocaman
Tags:arj RemcosRAT


Avatar
cocaman
Malicious email (T1566.001)
From: "wanchalerm@berlinpharm.com" (likely spoofed)
Received: "from berlinpharm.com (unknown [192.3.198.20]) "
Date: "12 Nov 2025 05:49:39 -0800"
Subject: "PURCHASE ORDER PO-2025-10024"
Attachment: "PURCHASE ORDER-2025-110010_xls.arj"

Intelligence

File Origin
# of uploads :
1
# of downloads :
75
Origin country :
CH CH
File Archive Information

This file archive contains 1 file(s), sorted by their relevance:

File name:PURCHASE ORDER-2025-110010_xls.exe
File size:1'299'456 bytes
SHA256 hash: 7440ef0eba8981a16f223b10ccccd80671001258b5fd8e95e43161de32b1157d
MD5 hash: fafa79f9adf092f90b9bb19fcd9158db
MIME type:application/x-dosexec
Signature RemcosRAT
Vendor Threat Intelligence
Detection(s):
Sanesecurity.Foxhole.Rar_fs963.UNOFFICIAL
Create hunting rule

Sanesecurity.Foxhole.Rar_xls.UNOFFICIAL
Create hunting rule

SecuriteInfo.com.PSW.Agent.BORA.UNOFFICIAL
Create hunting rule

Verdict:
Malicious
Score:
97.4%
Link:
https://cyber-fortress.com/docs/result/index.php?id=69148fb228ddbbca4d8d61f2
Tags:
underscore autorun autoit emotet
Verdict:
Likely Malicious
Threat level:
  7.5/10
Confidence:
100%
Tags:
adaptive-context anti-debug autoit compiled-script fingerprint installer-heuristic keylogger masquerade microsoft_visual_cc nymeria packed
Link:
https://www.filescan.io/uploads/69149431adab62be76df5c34/reports/ccc06928-1757-46ab-a606-af22d74dd98b/overview
Verdict:
Malicious
Labled as:
Trojan.Downloader
Link:
https://www.hybrid-analysis.com/sample/3937e4805c217565c9ad28b7a99d8f1cdef327c8ddeaa864927db72ca3daea09
Verdict:
Malicious
File Type:
rar
First seen:
2025-11-12T00:32:00Z UTC
Last seen:
2025-11-14T10:24:00Z UTC
Hits:
~1000
Link:
https://opentip.kaspersky.com/3937e4805c217565c9ad28b7a99d8f1cdef327c8ddeaa864927db72ca3daea09/results?tab=lookup
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/3937e4805c217565c9ad28b7a99d8f1cdef327c8ddeaa864927db72ca3daea09/
Verdict:
Malicious
Threat:
Family.REMCOS
Link:
https://tip.neiki.dev/file/3937e4805c217565c9ad28b7a99d8f1cdef327c8ddeaa864927db72ca3daea09
Threat name:
Win32.Trojan.AutoitInject
Create hunting rule
Status:
Malicious
First seen:
2025-11-12 14:06:25 UTC
File Type:
Binary (Archive)
Extracted files:
25
AV detection:
24 of 38 (63.16%)
Threat level:
  5/5
Detection(s):
Malicious file
Link:
https://check.spamhaus.org/check/?searchterm=he36jac4ef2wlsnnfc32thmpdtppgj6i3xvkqzespw3szi625ieq._file
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/3937e4805c217565c9ad28b7a99d8f1cdef327c8ddeaa864927db72ca3daea09

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:AutoIT_Compiled
Create hunting rule
Author:@bartblaze
Description:Identifies compiled AutoIT script (as EXE). This rule by itself does NOT necessarily mean the detected file is malicious.
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: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:TH_Generic_MassHunt_Win_Malware_2025_CYFARE
Create hunting rule
Author:CYFARE
Description:Generic Windows malware mass-hunt rule - 2025
Reference:https://cyfare.net/
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_rat_generic
Create hunting rule
Author:Reedus0
Description:Rule for detecting generic RAT malware
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:YahLover
Create hunting rule
Author:Kevin Falcoz
Description:YahLover
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

arj 3937e4805c217565c9ad28b7a99d8f1cdef327c8ddeaa864927db72ca3daea09

(this sample)

RemcosRAT

Executable exe 7440ef0eba8981a16f223b10ccccd80671001258b5fd8e95e43161de32b1157d

  
Delivery method
Distributed via e-mail attachment
  
Dropping
SHA256 7440ef0eba8981a16f223b10ccccd80671001258b5fd8e95e43161de32b1157d
  
Dropping
RemcosRAT
  
Dropping
MD5 fafa79f9adf092f90b9bb19fcd9158db

Comments