MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 b58c45d8dd9e899b926893321a923382aeaa7c3899d9166bb4a86f40a99fb767. 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: 20


Intelligence 20 IOCs YARA 22 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: b58c45d8dd9e899b926893321a923382aeaa7c3899d9166bb4a86f40a99fb767
SHA3-384 hash: af889bc887a782fe4965195e5faaba3838196b4d05babaea1f495426d892d101a8491c5d26b0b7eda0a257783a5d6325
SHA1 hash: 1029711a4efc38e18c60868a38dd87c38e0ace8a
MD5 hash: 22ecb8f9ddd76f53c18edd80d9ea9d9b
humanhash: william-illinois-louisiana-stream
File name:BROSTU2323402025.exe
Download: download sample
Signature RemcosRAT
Create hunting rule
File size:997'384 bytes
First seen:2025-03-25 04:00:08 UTC
Last seen:Never
File type:Executable exe
MIME type:application/x-dosexec
imphash f34d5f2d4577ed6d9ceec516c1f5a744 (48'657 x AgentTesla, 19'469 x Formbook, 12'208 x SnakeKeylogger)
ssdeep 24576:5f7WZvDFZUkRo/OlqEwRvQ1RG9dIS7sgEpdF74c:tWvD/UyAnz9XAgEpdF75
TLSH T14125236D7FD09250C74E46B38583EC55C225F108F8E2E33368DE98B77EDAA95404A9CB
TrID 69.7% (.EXE) Generic CIL Executable (.NET, Mono, etc.) (73123/4/13)
10.0% (.EXE) Win64 Executable (generic) (10522/11/4)
6.2% (.DLL) Win32 Dynamic Link Library (generic) (6578/25/2)
4.2% (.EXE) Win32 Executable (generic) (4504/4/1)
1.9% (.EXE) Win16/32 Executable Delphi generic (2072/23)
Magika pebin
dhash icon 2d25256347130321 (2 x RemcosRAT, 1 x MassLogger)
Reporter abuse_ch
Tags:exe RAT RemcosRAT


Avatar
abuse_ch
RemcosRAT C2:
216.250.248.203:1988

Intelligence

File Origin
# of uploads :
1
# of downloads :
557
Origin country :
NL NL
Vendor Threat Intelligence
Malware family:
remcos
Create hunting rule
ID:
1
File name:
BROSTU2323402025.exe
Verdict:
Malicious activity
Analysis date:
2025-03-25 13:50:58 UTC
Tags:
rat remcos
Link:
https://app.any.run/tasks/3758a508-0e05-4526-b4b9-f796c962b4f9

Note:
ANY.RUN is an interactive sandbox that analyzes all user actions rather than an uploaded sample
Detection(s):
SecuriteInfo.com.Win32.MalwareX-gen.19752.30865.UNOFFICIAL
Create hunting rule

Verdict:
Malicious
Score:
99.1%
Link:
https://cyber-fortress.com/docs/result/index.php?id=67e24f1abb84e066269ee4e9
Tags:
crypted remcos msil remo
Result
Verdict:
Malware
Maliciousness:

Behaviour
Creating a window
Сreating synchronization primitives
Creating a process with a hidden window
Unauthorized injection to a recently created process
Restart of the analyzed sample
Creating a file
Setting a keyboard event handler
Connection attempt
Sending a custom TCP request
DNS request
Sending an HTTP GET request
Adding an exclusion to Microsoft Defender
Verdict:
Malicious
Threat level:
  10/10
Confidence:
100%
Tags:
expired-cert invalid-signature obfuscated obfuscated packed packed packer_detected signed
Link:
https://www.filescan.io/uploads/67e22a52e245f7bec6d1980a/reports/faca6c77-fa40-4a8d-b3c8-faea4f39c7b5/overview
Verdict:
Malicious
Labled as:
HackTool[Obfuscator]/MSIL.DeepSea
Link:
https://www.hybrid-analysis.com/sample/b58c45d8dd9e899b926893321a923382aeaa7c3899d9166bb4a86f40a99fb767
Result
Verdict:
SUSPICIOUS
Details
Windows PE Executable
Found a Windows Portable Executable (PE) binary. Depending on context, the presence of a binary is suspicious or malicious.
Malware family:
REMCOS
Create hunting rule
Verdict:
Malicious
Link:
https://analyze.intezer.com/analyses/6dc56e12-158b-4290-831a-e645e2bdb20c
Result
Threat name:
Remcos
Create hunting rule
Detection:
malicious
Classification:
rans.troj.spyw.expl.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/1647661
Signature
.NET source code contains potential unpacker
.NET source code contains very large array initializations
Adds a directory exclusion to Windows Defender
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 Chrome passwords or cookies
Contains functionality to steal Firefox passwords or cookies
Contains functionalty to change the wallpaper
Detected Remcos RAT
Found malware configuration
Installs a global keyboard hook
Joe Sandbox ML detected suspicious sample
Loading BitLocker PowerShell Module
Malicious sample detected (through community Yara rule)
Multi AV Scanner detection for submitted file
Sigma detected: Powershell Base64 Encoded MpPreference Cmdlet
Sigma detected: Remcos
Suricata IDS alerts for network traffic
Yara detected AntiVM3
Yara detected Remcos RAT
Yara detected UAC Bypass using CMSTP
Behaviour
Behavior Graph:
Download SVG
Score:
100%
Verdict:
Malware
File Type:
PE
Link:
https://malprob.io/report/b58c45d8dd9e899b926893321a923382aeaa7c3899d9166bb4a86f40a99fb767
Detection:
remcos
Create hunting rule
Link:
https://mwdb.cert.pl/sample/b58c45d8dd9e899b926893321a923382aeaa7c3899d9166bb4a86f40a99fb767/
Threat name:
Win32.Infostealer.Limitail
Create hunting rule
Status:
Malicious
First seen:
2025-03-25 04:00:19 UTC
File Type:
PE (.Net Exe)
Extracted files:
2
AV detection:
24 of 36 (66.67%)
Threat level:
  5/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=wwgelwg5t2ezxetismzbvertqkxku7bythmrm25uvbxubkm7w5tq._file
Verdict:
malicious
Label(s):
unc_loader_037
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remcos
Create hunting rule
Similar samples:
error
RemcosRAT
Result
Malware family:
remcos
Create hunting rule
Score:
  10/10
Tags:
family:remcos botnet:bongo discovery execution rat
Link:
https://tria.ge/reports/250325-eksa3atqx2/
Behaviour
Suspicious behavior: EnumeratesProcesses
Suspicious use of AdjustPrivilegeToken
Suspicious use of SetWindowsHookEx
Suspicious use of WriteProcessMemory
Enumerates physical storage devices
System Location Discovery: System Language Discovery
Suspicious use of SetThreadContext
Checks computer location settings
Command and Scripting Interpreter: PowerShell
Remcos
Remcos family
Malware Config
C2 Extraction:
216.250.248.203:1988
Verdict:
Malicious
Tags:
remcos
YARA:
n/a
Link:
https://app.threat.zone/submission/0f983805-d256-4fa2-82c8-f8817944e19d
Unpacked files
SH256 hash:
b58c45d8dd9e899b926893321a923382aeaa7c3899d9166bb4a86f40a99fb767
MD5 hash:
22ecb8f9ddd76f53c18edd80d9ea9d9b
SHA1 hash:
1029711a4efc38e18c60868a38dd87c38e0ace8a
Link:
https://www.unpac.me/results/4b2f8efd-290f-486e-9785-dc895d2f886c/
SH256 hash:
479b2b88236dc456b9c9dfcff8ee9e70c80d12c0f7b02b3090a9fe55f772b689
MD5 hash:
e3f6e491829c48e1ba0709f786109cef
SHA1 hash:
3e300dbb2a18a38cfcfdcdc2a71b47fada2b73a2
Link:
https://www.unpac.me/results/4b2f8efd-290f-486e-9785-dc895d2f886c/
SH256 hash:
c4aa4449f023bd53391e8a901f99575b687b26ddd5ad6d4faf8de6e2b45d1e03
MD5 hash:
b33d37ad313f12b9e145acbf49959ded
SHA1 hash:
7fcf84ad9fd929bdb2ea6b9ce584b0a7329ffe2c
Detections:
win_remcos_w0
Create hunting rule
win_remcos_auto
Create hunting rule
Remcos
Create hunting rule
malware_windows_remcos_rat
Create hunting rule
win_remcos_rat_unpacked
Create hunting rule
INDICATOR_SUSPICIOUS_EXE_UACBypass_CMSTPCOM
Create hunting rule
Link:
https://www.unpac.me/results/4b2f8efd-290f-486e-9785-dc895d2f886c/
Parent samples :
4f30ff34b7783623eeb7e213fc6a4bfe560e4607271791144262a3e5e3b9b1ed
b58c45d8dd9e899b926893321a923382aeaa7c3899d9166bb4a86f40a99fb767
SH256 hash:
2177ec75e123cb8da06b5d306ebfaf96e2d45a7fc69f1187c42902733ad67e1e
MD5 hash:
312e2afdcee6df49d37a03d9cf0df85f
SHA1 hash:
a9b9c181ed411c4b45b76fdba24500f5840b7f33
Detections:
SUSP_OBF_NET_ConfuserEx_Name_Pattern_Jan24
Create hunting rule
SUSP_OBF_NET_Reactor_Indicators_Jan24
Create hunting rule
Link:
https://www.unpac.me/results/4b2f8efd-290f-486e-9785-dc895d2f886c/
Malware family:
Remcos
Create hunting rule
Verdict:
Malicious
Link:
https://www.vmray.com/analyses/_mb/b58c45d8dd9e/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/b58c45d8dd9e899b926893321a923382aeaa7c3899d9166bb4a86f40a99fb767

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:cobalt_strike_tmp01925d3f
Create hunting rule
Author:The DFIR Report
Description:files - file ~tmp01925d3f.exe
Reference:https://thedfirreport.com
Rule name:DebuggerCheck__API
Create hunting rule
Reference:https://github.com/naxonez/yaraRules/blob/master/AntiDebugging.yara
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:golang_bin_JCorn_CSC846
Create hunting rule
Author:Justin Cornwell
Description:CSC-846 Golang detection ruleset
Rule name:INDICATOR_KB_CERT_7c1118cbbadc95da3752c46e47a27438
Create hunting rule
Author:ditekSHen
Description:Detects executables signed with stolen, revoked or invalid certificates
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:NETexecutableMicrosoft
Create hunting rule
Author:malware-lu
Rule name:pe_detect_tls_callbacks
Create hunting rule
Rule name:PE_Digital_Certificate
Create hunting rule
Author:albertzsigovits
Rule name:pe_imphash
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:Skystars_Malware_Imphash
Create hunting rule
Author:Skystars LightDefender
Description:imphash
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.

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 (HIGH_ENTROPY_VA)high

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