MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 4ffb945bc637b8c2e1d287c1f6127121d967e1366f0a437f2b7f505fac391f5d. 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: 15


Intelligence 15 IOCs YARA 22 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: 4ffb945bc637b8c2e1d287c1f6127121d967e1366f0a437f2b7f505fac391f5d
SHA3-384 hash: 5c5869691e58a278b6c57c8b29e50fd97acc174528f525a150da744587226fa08e71d6dced315f743ca1fb2fbc08630d
SHA1 hash: 2c230b899d7978dac3f4fb002083d55aae558af2
MD5 hash: 7c8789ba4d50339313e658adf498fa6e
humanhash: virginia-september-december-mirror
File name:AWB#8940971580-pdf.bat
Download: download sample
Signature RemcosRAT
Create hunting rule
File size:797'241 bytes
First seen:2025-10-24 09:08:37 UTC
Last seen:Never
File type:Batch (bat) bat
MIME type:text/plain
ssdeep 12288:hwpPbfY+gcbNCymwBWTdQhQJm0ivnMcelxQM61MuA8kGx8VG:hsgc5CQYM7MnxjcM38Aw
TLSH T16905F13EE294FC9F032BB3965F75795610C81E72DBB509D891C40F653B1FA098E2923A
Magika batch
Reporter abuse_ch
Tags:bat RAT RemcosRAT

Intelligence

File Origin
# of uploads :
1
# of downloads :
79
Origin country :
SE SE
Vendor Threat Intelligence
Malware family:
remcos
Create hunting rule
ID:
1
File name:
AWB#8940971580-pdf.bat
Verdict:
Malicious activity
Analysis date:
2025-10-24 09:11:16 UTC
Tags:
auto-startup remcos rat remote stealer susp-powershell api-base64 mpress
Link:
https://app.any.run/tasks/43b8eef1-09f3-40c3-8640-f84b07e88d48

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/34012/
Verdict:
Malicious
Score:
92.5%
Link:
https://cyber-fortress.com/docs/result/index.php?id=68fb425a6c859164aa63dff7
Tags:
autorun lien
Result
Verdict:
Malware
Maliciousness:

Behaviour
Running batch commands
Launching cmd.exe command interpreter
Creating a file
Delayed writing of the file
Launching a process
Сreating synchronization primitives
Connection attempt
Sending a custom TCP request
Enabling autorun by creating a file
Verdict:
Unknown
Threat level:
  2.5/10
Confidence:
100%
Tags:
obfuscated
Link:
https://www.filescan.io/uploads/68fb423c11ff3db29f67a40b/reports/1c89cda4-651c-47b8-9610-2900db76465b/overview
Verdict:
Unknown
Link:
https://www.hybrid-analysis.com/sample/4ffb945bc637b8c2e1d287c1f6127121d967e1366f0a437f2b7f505fac391f5d
Verdict:
Malicious
File Type:
unix shell
First seen:
2025-10-23T22:10:00Z UTC
Last seen:
2025-10-26T04:44:00Z UTC
Hits:
~100
Link:
https://opentip.kaspersky.com/4ffb945bc637b8c2e1d287c1f6127121d967e1366f0a437f2b7f505fac391f5d/results?tab=lookup
Result
Threat name:
Remcos
Create hunting rule
Detection:
malicious
Classification:
phis.troj.spyw.expl.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/1801143
Signature
.NET source code contains a sample name check
.NET source code references suspicious native API functions
Antivirus detection for dropped file
C2 URLs / IPs found in malware configuration
Detected Remcos RAT
Disable UAC(promptonsecuredesktop)
Drops script or batch files to the startup folder
Found hidden mapped module (file has been removed from disk)
Found malware configuration
Found suspicious powershell code related to unpacking or dynamic code loading
Joe Sandbox ML detected suspicious sample
Loading BitLocker PowerShell Module
Malicious sample detected (through community Yara rule)
Maps a DLL or memory area into another process
Multi AV Scanner detection for dropped file
Powershell drops PE file
Sigma detected: Base64 Encoded PowerShell Command Detected
Sigma detected: Drops script at startup location
Sigma detected: Potential PowerShell Obfuscation Via Reversed Commands
Sigma detected: PowerShell Base64 Encoded FromBase64String Cmdlet
Sigma detected: PowerShell Base64 Encoded IEX Cmdlet
Sigma detected: Remcos
Suricata IDS alerts for network traffic
Suspicious powershell command line found
Switches to a custom stack to bypass stack traces
Tries to harvest and steal browser information (history, passwords, etc)
Tries to steal Instant Messenger accounts or passwords
Tries to steal Mail credentials (via file / registry access)
Tries to steal Mail credentials (via file registry)
Writes to foreign memory regions
Yara detected Powershell decode and execute
Yara detected Remcos RAT
Yara detected UAC Bypass using CMSTP
Yara detected WebBrowserPassView password recovery tool
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 signatures2 2 Behavior Graph ID: 1801143 Sample: AWB#8940971580-pdf.bat Startdate: 24/10/2025 Architecture: WINDOWS Score: 100 105 Suricata IDS alerts for network traffic 2->105 107 Found malware configuration 2->107 109 Malicious sample detected (through community Yara rule) 2->109 111 16 other signatures 2->111 9 cmd.exe 1 2->9         started        12 cmd.exe 1 2->12         started        14 cmd.exe 1 2->14         started        16 11 other processes 2->16 process3 signatures4 115 Suspicious powershell command line found 9->115 18 cmd.exe 1 9->18         started        20 conhost.exe 9->20         started        22 cmd.exe 1 12->22         started        24 conhost.exe 12->24         started        26 cmd.exe 1 14->26         started        28 conhost.exe 14->28         started        30 cmd.exe 16->30         started        32 cmd.exe 16->32         started        34 20 other processes 16->34 process5 process6 36 cmd.exe 2 18->36         started        39 cmd.exe 1 22->39         started        41 cmd.exe 1 26->41         started        43 cmd.exe 30->43         started        45 cmd.exe 32->45         started        47 cmd.exe 34->47         started        49 cmd.exe 34->49         started        51 cmd.exe 34->51         started        53 6 other processes 34->53 signatures7 113 Suspicious powershell command line found 36->113 55 2 other processes 36->55 60 2 other processes 39->60 62 2 other processes 41->62 64 2 other processes 43->64 66 2 other processes 45->66 68 2 other processes 47->68 70 2 other processes 49->70 72 2 other processes 51->72 74 12 other processes 53->74 process8 dnsIp9 103 23.95.117.247, 2404, 49683, 49685 AS-COLOCROSSINGUS United States 55->103 99 4 other malicious files 55->99 dropped 117 Drops script or batch files to the startup folder 55->117 119 Writes to foreign memory regions 55->119 121 Found hidden mapped module (file has been removed from disk) 55->121 125 6 other signatures 55->125 76 RmClient.exe 14 55->76         started        79 RmClient.exe 1 55->79         started        81 RmClient.exe 1 55->81         started        83 2 other processes 55->83 85 C:\Users\user\AppData\Roaming\...\ee37.bat, ASCII 60->85 dropped 87 C:\Users\user\AppData\Roaming\...\5d89.bat, ASCII 62->87 dropped 89 C:\Users\user\AppData\Roaming\...\1d7b.bat, ASCII 64->89 dropped 91 C:\Users\user\AppData\Roaming\...\48c3.bat, ASCII 66->91 dropped 93 C:\Users\user\AppData\Roaming\...\91ba.bat, ASCII 68->93 dropped 95 C:\Users\user\AppData\Roaming\...\7909.bat, ASCII 70->95 dropped 97 C:\Users\user\AppData\Roaming\...\e919.bat, ASCII 72->97 dropped 101 6 other malicious files 74->101 dropped 123 Detected Remcos RAT 74->123 file10 signatures11 process12 signatures13 127 Tries to steal Mail credentials (via file registry) 76->127 129 Tries to harvest and steal browser information (history, passwords, etc) 76->129 131 Tries to steal Instant Messenger accounts or passwords 79->131 133 Tries to steal Mail credentials (via file / registry access) 79->133
Score:
100%
Verdict:
Malware
File Type:
SCRIPT
Link:
https://malprob.io/report/4ffb945bc637b8c2e1d287c1f6127121d967e1366f0a437f2b7f505fac391f5d
Detection:
remcos
Create hunting rule
Link:
https://mwdb.cert.pl/sample/4ffb945bc637b8c2e1d287c1f6127121d967e1366f0a437f2b7f505fac391f5d/
Verdict:
Malicious
Threat:
Family.REMCOS
Link:
https://tip.neiki.dev/file/4ffb945bc637b8c2e1d287c1f6127121d967e1366f0a437f2b7f505fac391f5d
Threat name:
Text.Trojan.Generic
Create hunting rule
Status:
Suspicious
First seen:
2025-10-24 04:18:11 UTC
File Type:
Text (Batch)
AV detection:
4 of 24 (16.67%)
Threat level:
  5/5
Detection(s):
Malicious file
Link:
https://check.spamhaus.org/check/?searchterm=j75ziw6gg64mfyosq7a7metrehmwpyjwn4feg7zlp5if7lbzd5oq._file
Result
Malware family:
donutloader
Create hunting rule
Score:
  10/10
Tags:
family:donutloader collection discovery execution loader
Link:
https://tria.ge/reports/251024-k4glkaykfn/
Behaviour
Suspicious behavior: EnumeratesProcesses
Suspicious use of AdjustPrivilegeToken
Suspicious use of WriteProcessMemory
System Location Discovery: System Language Discovery
Suspicious use of SetThreadContext
Accesses Microsoft Outlook accounts
Command and Scripting Interpreter: PowerShell
Drops startup file
Badlisted process makes network request
Detected Nirsoft tools
NirSoft MailPassView
NirSoft WebBrowserPassView
Detects DonutLoader
DonutLoader
Donutloader family
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/4ffb945bc637b8c2e1d287c1f6127121d967e1366f0a437f2b7f505fac391f5d

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: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_EXE_Packed_MPress
Create hunting rule
Author:ditekSHen
Description:Detects executables built or packed with MPress PE compressor
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:pe_no_import_table
Create hunting rule
Description:Detect pe file that no import table
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:TeslaCryptPackedMalware
Create hunting rule
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/34012/

Comments