MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 81bd5ea2395abf6ca7e0959d84a2ecc797c24f789ab18afc6eeeea69c41a2457. 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: 21


Intelligence 21 IOCs YARA 26 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: 81bd5ea2395abf6ca7e0959d84a2ecc797c24f789ab18afc6eeeea69c41a2457
SHA3-384 hash: 139db015ae8386583e1edf66651ac874b2048301a72075722c69d90ea9baf6382a49db60055e4aa2eea01e1a9225bcc9
SHA1 hash: 30da55ee747359debe1916c706ed8b524f742bec
MD5 hash: b13eebd55c0e129b97cfb16b387dc121
humanhash: kentucky-fanta-enemy-pennsylvania
File name:81bd5ea2395abf6ca7e0959d84a2ecc797c24f789ab18afc6eeeea69c41a2457
Download: download sample
Signature RemcosRAT
Create hunting rule
File size:1'155'584 bytes
First seen:2025-06-26 17:42:21 UTC
Last seen:Never
File type:Executable exe
MIME type:application/x-dosexec
imphash f34d5f2d4577ed6d9ceec516c1f5a744 (48'813 x AgentTesla, 19'735 x Formbook, 12'282 x SnakeKeylogger)
ssdeep 24576:b0VSe8kjzKKNosJQKLv+SmhuRZdrsx5Y4t1DfjH5tXdz+B0f:YTNLNosaa5fRLrsI4vjZtX8i
Threatray 4'603 similar samples on MalwareBazaar
TLSH T1DD3523A6539BD631C27E833A00E67F0D4AACB4F6878EEB990D4C6146F453BD6A407347
TrID 67.7% (.EXE) Generic CIL Executable (.NET, Mono, etc.) (73123/4/13)
9.7% (.EXE) Win64 Executable (generic) (10522/11/4)
6.0% (.DLL) Win32 Dynamic Link Library (generic) (6578/25/2)
4.6% (.EXE) Win16 NE executable (generic) (5038/12/1)
4.1% (.EXE) Win32 Executable (generic) (4504/4/1)
Magika pebin
Reporter johnk3r
Tags:cirugia4k-con-ip-com exe remcos RemcosRAT

Intelligence

File Origin
# of uploads :
1
# of downloads :
528
Origin country :
DE DE
Vendor Threat Intelligence
Malware family:
remcos
Create hunting rule
ID:
1
File name:
81bd5ea2395abf6ca7e0959d84a2ecc797c24f789ab18afc6eeeea69c41a2457
Verdict:
Malicious activity
Analysis date:
2025-06-26 17:43:42 UTC
Tags:
remcos rat auto-reg
Link:
https://app.any.run/tasks/aca9f71b-35e1-4d5f-843b-4699607aa954

Note:
ANY.RUN is an interactive sandbox that analyzes all user actions rather than an uploaded sample
Detection:
Remcos
Create hunting rule
Link:
https://www.capesandbox.com/analysis/11273/
Detection(s):
Win.Packed.Msilheracles-10017859-0
Create hunting rule

Verdict:
Malicious
Score:
70%
Link:
https://cyber-fortress.com/docs/result/index.php?id=685d8687b06783b9ebd8482d
Tags:
smartassembly packed spawn
Result
Verdict:
Malware
Maliciousness:

Behaviour
Searching for the window
Creating a file in the %AppData% directory
Launching a process
Creating a process with a hidden window
Сreating synchronization primitives
DNS request
Creating a file
Enabling autorun with the standard Software\Microsoft\Windows\CurrentVersion\Run registry branch
Unauthorized injection to a system process
Verdict:
Malicious
Threat level:
  10/10
Confidence:
100%
Tags:
base64 entropy obfuscated obfuscated packed packed packer_detected smartassembly smart_assembly
Link:
https://www.filescan.io/uploads/685d86c0d1f1eb5d81c7742a/reports/5c05ea7a-69ea-4d93-95eb-6817d0efd24f/overview
Verdict:
Malicious
Labled as:
Ransom.Samas.Generic
Link:
https://www.hybrid-analysis.com/sample/81bd5ea2395abf6ca7e0959d84a2ecc797c24f789ab18afc6eeeea69c41a2457
Malware family:
REMCOS
Create hunting rule
Verdict:
Malicious
Link:
https://analyze.intezer.com/analyses/1afa01bb-e80e-46d9-9e30-6354bf39e2e5
Result
Threat name:
Remcos, ResolverRAT
Create hunting rule
Detection:
malicious
Classification:
troj.spyw.expl.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/1723671
Signature
.NET source code contains potential unpacker
Allocates memory in foreign processes
Antivirus / Scanner detection for submitted sample
Antivirus detection for dropped file
C2 URLs / IPs found in malware configuration
Detected Remcos RAT
Found malware configuration
Injects a PE file into a foreign processes
Installs a global keyboard hook
Joe Sandbox ML detected suspicious sample
Malicious sample detected (through community Yara rule)
Multi AV Scanner detection for submitted file
Opens the same file many times (likely Sandbox evasion)
Sigma detected: Remcos
Tries to detect sandboxes and other dynamic analysis tools (process name or module or function)
Writes to foreign memory regions
Yara detected AntiVM3
Yara detected Costura Assembly Loader
Yara detected Remcos RAT
Yara detected ResolverRAT
Yara detected UAC Bypass using CMSTP
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 dnsIp2 2 Behavior Graph ID: 1723671 Sample: ADFwreoqWL.exe Startdate: 26/06/2025 Architecture: WINDOWS Score: 100 35 cirugia4k.con-ip.com 2->35 43 Found malware configuration 2->43 45 Malicious sample detected (through community Yara rule) 2->45 47 Antivirus / Scanner detection for submitted sample 2->47 49 10 other signatures 2->49 7 ADFwreoqWL.exe 1 4 2->7         started        11 Mbtmhux.exe 2 2->11         started        13 Mbtmhux.exe 2 2->13         started        signatures3 process4 file5 29 C:\Users\user\AppData\Roaming\Mbtmhux.exe, PE32 7->29 dropped 31 C:\Users\user\...\Mbtmhux.exe:Zone.Identifier, ASCII 7->31 dropped 51 Tries to detect sandboxes and other dynamic analysis tools (process name or module or function) 7->51 53 Writes to foreign memory regions 7->53 55 Allocates memory in foreign processes 7->55 15 InstallUtil.exe 3 3 7->15         started        57 Antivirus detection for dropped file 11->57 59 Injects a PE file into a foreign processes 11->59 19 InstallUtil.exe 11->19         started        21 InstallUtil.exe 11->21         started        23 InstallUtil.exe 11->23         started        25 InstallUtil.exe 11->25         started        27 InstallUtil.exe 13->27         started        signatures6 process7 file8 33 C:\ProgramData\remcos\logs.dat, data 15->33 dropped 37 Detected Remcos RAT 15->37 39 Opens the same file many times (likely Sandbox evasion) 15->39 41 Installs a global keyboard hook 15->41 signatures9
Score:
100%
Verdict:
Malware
File Type:
PE
Link:
https://malprob.io/report/81bd5ea2395abf6ca7e0959d84a2ecc797c24f789ab18afc6eeeea69c41a2457
Verdict:
inconclusive
YARA:
5 match(es)
Tags:
.Net Executable PE (Portable Executable) Win 32 Exe x86
Link:
https://app.malva.re/file/b13eebd55c0e129b97cfb16b387dc121
Detection:
remcos
Create hunting rule
Link:
https://mwdb.cert.pl/sample/81bd5ea2395abf6ca7e0959d84a2ecc797c24f789ab18afc6eeeea69c41a2457/
Verdict:
Malicious
Link:
https://tip.neiki.dev/file/81bd5ea2395abf6ca7e0959d84a2ecc797c24f789ab18afc6eeeea69c41a2457
Threat name:
ByteCode-MSIL.Spyware.AsyncRAT
Create hunting rule
Status:
Malicious
First seen:
2025-06-26 17:43:29 UTC
File Type:
PE (.Net Exe)
Extracted files:
1
AV detection:
21 of 24 (87.50%)
Threat level:
  2/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=qg6v5irzlk7wzj7aswoyjixmy6l4et3ytkyyv7do53vgtra2erlq._file
Verdict:
malicious
Label(s):
remcos
Create hunting rule
Similar samples:
007f77e684f4a7e6e64a0a42dc4001b58295a376822f6da576af60c600503935
RemcosRAT
2998c9450c0410adcf943c88783718017418ede6ce92368be07b515f7395c650
RemcosRAT
4f43043ac4f71ee0f3416e75534ab2616ae90eb887a083b6f2e39995b334c2bc
RemcosRAT
5933dcc6e1411448bf62c554b4ff7b437665bcd8ad3ee37ed30253d6603d1e98
RemcosRAT
81bd5ea2395abf6ca7e0959d84a2ecc797c24f789ab18afc6eeeea69c41a2457
RemcosRAT
820485feb8d8b9c13f3f2bc037f7918b0a38526c6f7193f878b2d410572dac26
RemcosRAT
ae724f16e8ec11a0d12439ffe18032ae2cbd388d419475f77be39fe9c4045a97
RemcosRAT
d38b7f092af30ecfbbfdb162e1dd8baabb4c0f2dee65ec5179126a8488e499e6
RemcosRAT
error
RemcosRAT
+ 4'593 additional samples on MalwareBazaar
Result
Malware family:
remcos
Create hunting rule
Score:
  10/10
Tags:
family:remcos botnet:cirugia 4k discovery persistence rat
Link:
https://tria.ge/reports/250626-v97p2sdn8s/
Behaviour
Suspicious behavior: EnumeratesProcesses
Suspicious use of AdjustPrivilegeToken
Suspicious use of SetWindowsHookEx
Suspicious use of WriteProcessMemory
System Location Discovery: System Language Discovery
Suspicious use of SetThreadContext
Adds Run key to start application
Executes dropped EXE
Remcos
Remcos family
Malware Config
C2 Extraction:
cirugia4k.con-ip.com:1090
Verdict:
Malicious
Tags:
Win.Packed.Msilheracles-10017859-0
YARA:
n/a
Link:
https://app.threat.zone/submission/fd248023-505e-43e9-9b0f-fcc90eaa125d
Unpacked files
SH256 hash:
81bd5ea2395abf6ca7e0959d84a2ecc797c24f789ab18afc6eeeea69c41a2457
MD5 hash:
b13eebd55c0e129b97cfb16b387dc121
SHA1 hash:
30da55ee747359debe1916c706ed8b524f742bec
Link:
https://www.unpac.me/results/de0c3283-e10f-4d64-a840-10ab7f4e3c1c/
SH256 hash:
7c0e218987baae6ba580630b01b922d4cf62658530f312068afe59514db037e2
MD5 hash:
6795eadb50b89ce4c8980a8418ca7be4
SHA1 hash:
ed51e144dc92476cd689f37a9825665923974a5b
Detections:
SUSP_OBF_NET_Reactor_Indicators_Jan24
Create hunting rule
Link:
https://www.unpac.me/results/de0c3283-e10f-4d64-a840-10ab7f4e3c1c/
Malware family:
Remcos
Create hunting rule
Verdict:
Malicious
Link:
https://www.vmray.com/analyses/_mb/81bd5ea2395a/report/overview.html
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/81bd5ea2395abf6ca7e0959d84a2ecc797c24f789ab18afc6eeeea69c41a2457

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: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:golang_bin_JCorn_CSC846
Create hunting rule
Author:Justin Cornwell
Description:CSC-846 Golang detection ruleset
Rule name:iexplorer_remcos
Create hunting rule
Author:iam-py-test
Description:Detect iexplorer being taken over by Remcos
Rule name:INDICATOR_EXE_Packed_SmartAssembly
Create hunting rule
Author:ditekSHen
Description:Detects executables packed with SmartAssembly
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:lsi_remcos
Create hunting rule
Author:anonym
Description:Remcos_V5 Payload
Rule name:lsi_remcos2
Create hunting rule
Author:anonym
Description:Remcos_V5 Payload
Rule name:NET
Create hunting rule
Author:malware-lu
Rule name:pe_detect_tls_callbacks
Create hunting rule
Rule name:pe_imphash
Create hunting rule
Rule name:RANSOMWARE
Create hunting rule
Author:ToroGuitar
Rule name:Remcos
Create hunting rule
Author:kevoreilly
Description:Remcos Payload
Rule name:remcos_
Create hunting rule
Author:Michelle Khalil
Description:This rule detects unpacked remcos malware samples.
Rule name:REMCOS_RAT_variants
Create hunting rule
Rule name:Remcos_unpacked_PulseIntel
Create hunting rule
Author:PulseIntel
Description:Remcos Payload
Rule name:Skystars_Malware_Imphash
Create hunting rule
Author:Skystars LightDefender
Description:imphash
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:Sus_Obf_Enc_Spoof_Hide_PE
Create hunting rule
Author:XiAnzheng
Description:Check for Overlay, Obfuscating, Encrypting, Spoofing, Hiding, or Entropy Technique(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.

Cape
Cape
https://www.capesandbox.com/analysis/11273/

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

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