MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 a8741f2d62f81c47812fd549d14aea8d5872afb9b9788d69c6f14d5bf6fc74ac. 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: 14


Intelligence 14 IOCs YARA 44 File information Comments
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SHA256 hash: a8741f2d62f81c47812fd549d14aea8d5872afb9b9788d69c6f14d5bf6fc74ac
SHA3-384 hash: 0ae478cc701e3b0ca791eb9d89bb08066617a1ad0242b2f28b3890fded1dffcf93bca1ee7631e68e62220fc5378a2fd0
SHA1 hash: 8f11c0baceed2feae50807f9f4ee87de72979570
MD5 hash: fb3c2d60e6f14b58a383ae1f9dcbae96
humanhash: dakota-solar-bluebird-whiskey
File name:IMG-202508-WA0008.js
Download: download sample
Signature RemcosRAT
Create hunting rule
File size:2'097'504 bytes
First seen:2025-09-03 05:57:33 UTC
Last seen:Never
File type:Java Script (JS) js
MIME type:text/plain
ssdeep 24576:JPMYqg803Q4JEsEXA0rgf1lZEeg2QxCblTy8L3u9j4tVx1Mujq0kLcHwC8g3V3Rq:9zxJEsh1ZEeDB2wDmum4FQOamN0
Threatray 227 similar samples on MalwareBazaar
TLSH T1C7A5E1378C57BC4E2BDC258584CE3CD50E6E0FDB81745AD4999AF1B22289E154EEC8BC
Magika vba
Reporter abuse_ch
Tags:js RAT RemcosRAT

Intelligence

File Origin
# of uploads :
1
# of downloads :
85
Origin country :
SE SE
Vendor Threat Intelligence
Detection(s):
no reply from clamd
Create hunting rule

Verdict:
Malicious
Score:
92.5%
Link:
https://cyber-fortress.com/docs/result/index.php?id=68b7d9093e988eb6ab83a04f
Tags:
delphi spawn blic sage
Verdict:
Malicious
Threat level:
  10/10
Confidence:
100%
Tags:
anti-debug base64 dropper fingerprint keylogger obfuscated obfuscated packed packed
Link:
https://www.filescan.io/uploads/68b7d9241c81c34281dc925f/reports/d87b1fc5-67b3-422e-a2ca-0f34a0d54e4a/overview
Verdict:
Malicious
Labled as:
GT:JS.Cbum.1.25F49B73;Gen:Zusy
Link:
https://www.hybrid-analysis.com/sample/a8741f2d62f81c47812fd549d14aea8d5872afb9b9788d69c6f14d5bf6fc74ac
Verdict:
Malicious
File Type:
js
First seen:
2025-09-02T20:02:00Z UTC
Last seen:
2025-09-02T20:02:00Z UTC
Hits:
~1000
Detections:
Trojan-Dropper.Win32.Agent.sb HEUR:Trojan.Win32.Shellcode.gen HEUR:Trojan.Script.SAgent.gen Trojan-PSW.Win32.Stealer.sb Backdoor.Win32.Remcos.e Trojan.Win64.Zenpak.sb HEUR:Trojan.Script.Generic Trojan-Dropper.Win32.Injector Trojan-Dropper.Win32.Dapato.sb Trojan.JS.SAgent.sb HEUR:Trojan-Spy.MSIL.Noon.gen PDM:Trojan.Win32.Generic Trojan-Dropper.JS.SDrop.sb Trojan.Win32.Shellcode.sb Trojan-Spy.Win32.Stealer.sb Exploit.Win32.BypassUAC.sb Backdoor.Win32.Remcos.sb Backdoor.Win32.Remcos.f Backdoor.Remcos.HTTP.C&C Trojan-Spy.Win32.Xegumumune.sbc Trojan-Downloader.JS.Cryptoload.sb
Link:
https://opentip.kaspersky.com/a8741f2d62f81c47812fd549d14aea8d5872afb9b9788d69c6f14d5bf6fc74ac/results?tab=lookup
Result
Threat name:
Remcos, DBatLoader, DarkCloud, PureLog S
Create hunting rule
Detection:
malicious
Classification:
rans.phis.troj.spyw.expl.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/1770106
Signature
.NET source code contains method to dynamically call methods (often used by packers)
.NET source code contains potential unpacker
Allocates many large memory junks
Allocates memory in foreign processes
Antivirus / Scanner detection for submitted sample
Antivirus detection for dropped file
Benign windows process drops PE files
C2 URLs / IPs found in malware configuration
Contains functionality to check if a debugger is running (CheckRemoteDebuggerPresent)
Contains functionality to inject code into remote processes
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
Delayed program exit found
Detected Remcos RAT
Drops VBS files to the startup folder
Early bird code injection technique detected
Found malware configuration
Injects a PE file into a foreign processes
Installs a global keyboard hook
JavaScript file contains suspicious strings
Joe Sandbox ML detected suspicious sample
JScript performs obfuscated calls to suspicious functions
Malicious sample detected (through community Yara rule)
Maps a DLL or memory area into another process
Multi AV Scanner detection for dropped file
Multi AV Scanner detection for submitted file
Queues an APC in another process (thread injection)
Sigma detected: DLL Search Order Hijackig Via Additional Space in Path
Sigma detected: Drops script at startup location
Sigma detected: Execution from Suspicious Folder
Sigma detected: Files With System Process Name In Unsuspected Locations
Sigma detected: Remcos
Sigma detected: WScript or CScript Dropper
Suricata IDS alerts for network traffic
Tries to detect sandboxes and other dynamic analysis tools (process name or module or function)
Tries to harvest and steal browser information (history, passwords, etc)
Tries to harvest and steal Putty / WinSCP information (sessions, passwords, etc)
Tries to steal Instant Messenger accounts or passwords
Tries to steal Mail credentials (via file / registry access)
Uses schtasks.exe or at.exe to add and modify task schedules
Windows Scripting host queries suspicious COM object (likely to drop second stage)
Writes to foreign memory regions
Yara detected AntiVM3
Yara detected Costura Assembly Loader
Yara detected DarkCloud
Yara detected DBatLoader
Yara detected Generic Dropper
Yara detected PureLog Stealer
Yara detected Remcos RAT
Yara detected ResolverRAT
Yara detected Telegram RAT
Yara detected WebBrowserPassView password recovery tool
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 dnsIp2 2 Behavior Graph ID: 1770106 Sample: IMG-202508-WA0008.js Startdate: 03/09/2025 Architecture: WINDOWS Score: 100 89 vestcast.co 2->89 91 showip.net 2->91 93 geoplugin.net 2->93 135 Suricata IDS alerts for network traffic 2->135 137 Found malware configuration 2->137 139 Malicious sample detected (through community Yara rule) 2->139 141 24 other signatures 2->141 10 wscript.exe 1 2 2->10         started        14 wscript.exe 2->14         started        16 wscript.exe 2->16         started        18 rundll32.exe 3 2->18         started        signatures3 process4 file5 71 C:\Users\user\AppData\Local\Temp\x.exe, PE32 10->71 dropped 161 Benign windows process drops PE files 10->161 163 JScript performs obfuscated calls to suspicious functions 10->163 165 Windows Scripting host queries suspicious COM object (likely to drop second stage) 10->165 20 x.exe 6 10->20         started        24 Key.exe 14->24         started        26 IsInvalid.exe 16->26         started        28 Qwqggslo.exe 18->28         started        signatures6 process7 file8 69 C:\Users\Public\...\Qwqggslo.exe (copy), PE32 20->69 dropped 143 Multi AV Scanner detection for dropped file 20->143 145 Early bird code injection technique detected 20->145 147 Uses schtasks.exe or at.exe to add and modify task schedules 20->147 159 2 other signatures 20->159 30 SndVol.exe 2 12 20->30         started        35 cmd.exe 1 20->35         started        37 cmd.exe 1 20->37         started        39 schtasks.exe 1 20->39         started        149 Antivirus detection for dropped file 24->149 151 Writes to foreign memory regions 24->151 153 Injects a PE file into a foreign processes 24->153 41 InstallUtil.exe 24->41         started        43 InstallUtil.exe 26->43         started        155 Allocates memory in foreign processes 28->155 157 Allocates many large memory junks 28->157 45 SndVol.exe 28->45         started        signatures9 process10 dnsIp11 95 geoplugin.net 178.237.33.50, 49693, 80 ATOM86-ASATOM86NL Netherlands 30->95 97 vestcast.co 147.124.215.99, 2490, 49688, 49689 AC-AS-1US United States 30->97 73 C:\Users\user\AppData\Roaming\dwn.exe, PE32 30->73 dropped 75 C:\Users\user\AppData\Local\Temp\dwn.exe, PE32 30->75 dropped 77 C:\ProgramData\remcos\logs.dat, data 30->77 dropped 99 Detected Remcos RAT 30->99 101 Contains functionalty to change the wallpaper 30->101 103 Contains functionality to steal Chrome passwords or cookies 30->103 111 6 other signatures 30->111 47 dwn.exe 30->47         started        51 dwn.exe 30->51         started        53 SndVol.exe 1 30->53         started        61 4 other processes 30->61 55 conhost.exe 35->55         started        57 conhost.exe 37->57         started        59 conhost.exe 39->59         started        105 Tries to harvest and steal Putty / WinSCP information (sessions, passwords, etc) 41->105 107 Tries to steal Mail credentials (via file / registry access) 41->107 109 Tries to harvest and steal browser information (history, passwords, etc) 41->109 file12 signatures13 process14 file15 79 C:\Users\user\AppData\Roaming\Key.exe, PE32 47->79 dropped 81 C:\Users\user\AppData\Roaming\...\Key.vbs, ASCII 47->81 dropped 113 Antivirus detection for dropped file 47->113 115 Multi AV Scanner detection for dropped file 47->115 117 Drops VBS files to the startup folder 47->117 119 Tries to detect sandboxes and other dynamic analysis tools (process name or module or function) 47->119 63 InstallUtil.exe 47->63         started        83 C:\Users\user\AppData\Roaming\IsInvalid.exe, PE32 51->83 dropped 85 C:\Users\user\AppData\...\IsInvalid.vbs, ASCII 51->85 dropped 121 Writes to foreign memory regions 51->121 123 Injects a PE file into a foreign processes 51->123 65 InstallUtil.exe 51->65         started        125 Tries to steal Instant Messenger accounts or passwords 53->125 127 Tries to steal Mail credentials (via file / registry access) 53->127 129 Tries to harvest and steal browser information (history, passwords, etc) 61->129 signatures16 process17 dnsIp18 87 showip.net 162.55.60.2, 49695, 49696, 49697 ACPCA United States 65->87 131 Tries to harvest and steal Putty / WinSCP information (sessions, passwords, etc) 65->131 133 Tries to steal Mail credentials (via file / registry access) 65->133 signatures19
Score:
97%
Verdict:
Malware
File Type:
SCRIPT
Link:
https://malprob.io/report/a8741f2d62f81c47812fd549d14aea8d5872afb9b9788d69c6f14d5bf6fc74ac
Verdict:
inconclusive
YARA:
1 match(es)
Link:
https://app.malva.re/file/fb3c2d60e6f14b58a383ae1f9dcbae96
Detection:
remcos
Create hunting rule
Link:
https://mwdb.cert.pl/sample/a8741f2d62f81c47812fd549d14aea8d5872afb9b9788d69c6f14d5bf6fc74ac/
Verdict:
Malicious
Threat:
Family.REMCOS
Link:
https://tip.neiki.dev/file/a8741f2d62f81c47812fd549d14aea8d5872afb9b9788d69c6f14d5bf6fc74ac
Threat name:
Script-JS.Dropper.RemcosRAT
Create hunting rule
Status:
Malicious
First seen:
2025-09-03 03:20:09 UTC
File Type:
Text
AV detection:
13 of 24 (54.17%)
Threat level:
  3/5
Detection(s):
Malicious file
Link:
https://check.spamhaus.org/check/?searchterm=vb2b6llc7aoepajp2ve5csxkrvmhfl5zxf4i22og6fgvx5x4oswa._file
Verdict:
malicious
Label(s):
dbatloader
Create hunting rule
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RemcosRAT
error
RemcosRAT
+ 217 additional samples on MalwareBazaar
Result
Malware family:
modiloader
Create hunting rule
Score:
  10/10
Tags:
family:modiloader collection discovery execution persistence trojan
Link:
https://tria.ge/reports/250903-gpl1ysgl6x/
Behaviour
Runs ping.exe
Scheduled Task/Job: Scheduled Task
Suspicious behavior: EnumeratesProcesses
Suspicious behavior: MapViewOfSection
Suspicious use of AdjustPrivilegeToken
Suspicious use of SetWindowsHookEx
Suspicious use of WriteProcessMemory
Command and Scripting Interpreter: JavaScript
Enumerates physical storage devices
System Location Discovery: System Language Discovery
System Network Configuration Discovery: Internet Connection Discovery
Suspicious use of SetThreadContext
Accesses Microsoft Outlook accounts
Checks computer location settings
Drops startup file
Executes dropped EXE
ModiLoader Second Stage
ModiLoader, DBatLoader
Modiloader 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/a8741f2d62f81c47812fd549d14aea8d5872afb9b9788d69c6f14d5bf6fc74ac

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:BLOWFISH_Constants
Create hunting rule
Author:phoul (@phoul)
Description:Look for Blowfish constants
Rule name:botnet_plaintext_c2
Create hunting rule
Author:cip
Description:Attempts to match at least some of the strings used in some botnet variants which use plaintext communication protocols.
Rule name:CP_AllMal_Detector
Create hunting rule
Author:DiegoAnalytics
Description:CrossPlatform All Malwares Detector: Detect PE, ELF, Mach-O, scripts, archives; overlay, obfuscation, encryption, spoofing, hiding, high entropy, network communication
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: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:iexplorer_remcos
Create hunting rule
Author:iam-py-test
Description:Detect iexplorer being taken over by Remcos
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_Binary_References_Browsers
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Author:ditekSHen
Description:Detects binaries (Windows and macOS) referencing many web browsers. Observed in information stealers.
Rule name:INDICATOR_SUSPICIOUS_EXE_CC_Regex
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Author:ditekSHen
Description:Detects executables referencing credit card regular expressions
Rule name:INDICATOR_SUSPICIOUS_EXE_References_Confidential_Data_Store
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Author:ditekSHen
Description:Detects executables referencing many confidential data stores found in browsers, mail clients, cryptocurreny wallets, etc. Observed in information stealers
Rule name:INDICATOR_SUSPICIOUS_EXE_References_Messaging_Clients
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Author:ditekSHen
Description:Detects executables referencing many email and collaboration clients. Observed in information stealers
Rule name:INDICATOR_SUSPICIOUS_EXE_SQLQuery_ConfidentialDataStore
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Author:ditekSHen
Description:Detects executables containing SQL queries to confidential data stores. Observed in infostealers
Rule name:INDICATOR_SUSPICIOUS_EXE_TelegramChatBot
Create hunting rule
Author:ditekSHen
Description:Detects executables using Telegram Chat Bot
Rule name:INDICATOR_SUSPICIOUS_EXE_UACBypass_EventViewer
Create hunting rule
Author:ditekSHen
Description:detects Windows exceutables potentially bypassing UAC using eventvwr.exe
Rule name:MALWARE_Win_A310Logger
Create hunting rule
Author:ditekSHen
Description:Detects A310Logger
Rule name:MALWARE_Win_DarkCloud
Create hunting rule
Author:ditekSHen
Description:Detects DarkCloud infostealer
Rule name:MD5_Constants
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Author:phoul (@phoul)
Description:Look for MD5 constants
Rule name:meth_stackstrings
Create hunting rule
Author:Willi Ballenthin
Rule name:NET
Create hunting rule
Author:malware-lu
Rule name:nirsoft_v1
Create hunting rule
Author:RandomMalware
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:ProtectSharewareV11eCompservCMS
Create hunting rule
Author:malware-lu
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:RIPEMD160_Constants
Create hunting rule
Author:phoul (@phoul)
Description:Look for RIPEMD-160 constants
Rule name:SEH__vba
Create hunting rule
Reference:https://github.com/naxonez/yaraRules/blob/master/AntiDebugging.yara
Rule name:SHA1_Constants
Create hunting rule
Author:phoul (@phoul)
Description:Look for SHA1 constants
Rule name:Sus_Obf_Enc_Spoof_Hide_PE
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Author:XiAnzheng
Description:Check for Overlay, Obfuscating, Encrypting, Spoofing, Hiding, or Entropy Technique(can create FP)
Rule name:telegram_bot_api
Create hunting rule
Author:rectifyq
Description:Detects file containing Telegram Bot API
Rule name:TeslaCryptPackedMalware
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Rule name:ThreadControl__Context
Create hunting rule
Reference:https://github.com/naxonez/yaraRules/blob/master/AntiDebugging.yara
Rule name:UPXV200V290MarkusOberhumerLaszloMolnarJohnReiser
Create hunting rule
Author:malware-lu
Rule name:Windows_Trojan_DarkCloud_9905abce
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_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.

Comments