MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 f73e99799f4ff717036cea15e6b3f2fb9b65da56906ae9d632a22b7ceb98ec3e. 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: 12


Intelligence 12 IOCs YARA 21 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: f73e99799f4ff717036cea15e6b3f2fb9b65da56906ae9d632a22b7ceb98ec3e
SHA3-384 hash: 5046094803fd252446d9ac959edeb2040205659b68229298c02c7fed954c5cc7044a9d63b7cdb389f3207c3797cf28ee
SHA1 hash: b938208eb51b6a7eab89ba0db883a37d8f8c1875
MD5 hash: 82953bb87b6620e3a15d2f20181c2931
humanhash: bluebird-social-quiet-iowa
File name:MV_ANNA_SCHULTE_APPOINTMENT_LETTER.JS
Download: download sample
Signature RemcosRAT
Create hunting rule
File size:4'733'802 bytes
First seen:2026-08-04 09:06:53 UTC
Last seen:Never
File type:Java Script (JS) js
MIME type:text/plain
ssdeep 98304:p/uFmB59peUjZhLRoLGJfyr5mY5AdcuAEDbUAnkP+sEwQt/hDgIzw5bp1VS/0wxd:p2FI5m4ZBKKJadm+RuAsUAkWsah7sjSP
TLSH T12326E7D7175992327332AB9D923ACD30D94A611305C9CF26317DE208BB6CD4BA75CEE2
Magika javascript
Reporter abuse_ch
Tags:js RAT RemcosRAT

Intelligence

File Origin
# of uploads :
1
# of downloads :
177
Origin country :
SE SE
Vendor Threat Intelligence
No detections
Detection(s):
Sanesecurity.Malware.29031.BadJs.UNOFFICIAL
Create hunting rule

Verdict:
Malicious
Threat level:
  10/10
Confidence:
100%
Tags:
anti-debug dropper evasive obfuscated packed repaired unsafe
Link:
https://www.filescan.io/uploads/6a71abdab1740d9dd3cc314b/reports/e3cc9aca-584f-4a46-8e9d-82fb2d142a57/overview
Verdict:
Malicious
Labled as:
GT:JS.ObfLoader.3
Link:
https://www.hybrid-analysis.com/sample/f73e99799f4ff717036cea15e6b3f2fb9b65da56906ae9d632a22b7ceb98ec3e
Verdict:
Malicious
File Type:
js
First seen:
2026-08-04T01:05:00Z UTC
Last seen:
2026-08-05T07:16:00Z UTC
Hits:
~1000
Link:
https://opentip.kaspersky.com/f73e99799f4ff717036cea15e6b3f2fb9b65da56906ae9d632a22b7ceb98ec3e/results?tab=lookup
Result
Threat name:
Remcos, DonutLoader
Create hunting rule
Detection:
malicious
Classification:
troj.spyw.expl.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/1951793
Signature
Antivirus / Scanner detection for submitted sample
C2 URLs / IPs found in malware configuration
Contains functionality to inject threads in other processes
Contains functionality to steal Internet Explorer form passwords
Detected Remcos RAT
Found API chain indicative of debugger detection
Found direct / indirect Syscall (likely to bypass EDR)
Found malware configuration
JavaScript source code contains call to eval() to check own source code (likely for evading instrumentation)
JavaScript source code contains functionality to generate code involving a shell, file or stream
Joe Sandbox ML detected suspicious sample
Malicious sample detected (through community Yara rule)
Multi AV Scanner detection for submitted file
Sigma detected: Invoke-Obfuscation CLIP+ Launcher
Sigma detected: Invoke-Obfuscation VAR+ Launcher
Sigma detected: Remcos
Sigma detected: Suspicious Command Patterns In Scheduled Task Creation
Sigma detected: WScript or CScript Dropper
Suricata IDS alerts for network traffic
Tries to detect sandboxes / dynamic malware analysis system (Installed program check)
Tries to harvest and steal browser information (history, passwords, etc)
Tries to steal Mail credentials (via file registry)
Unusual module load detection (module proxying)
Uses schtasks.exe or at.exe to add and modify task schedules
Uses whoami command line tool to query computer and username
Windows Scripting host queries suspicious COM object (likely to drop second stage)
WScript reads language and country specific registry keys (likely country aware script)
Yara detected DonutLoader
Yara detected Remcos RAT
Yara detected UAC Bypass using CMSTP
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 dnsIp2 2 Behavior Graph ID: 1951793 Sample: MV_ANNA_SCHULTE_APPOINTMENT... Startdate: 04/08/2026 Architecture: WINDOWS Score: 100 62 www.jahstandclassprojectbackup.com 2->62 64 www.jahstandclassproject.com 2->64 76 Suricata IDS alerts for network traffic 2->76 78 Found malware configuration 2->78 80 Malicious sample detected (through community Yara rule) 2->80 82 14 other signatures 2->82 10 wscript.exe 1 4 2->10         started        13 cmd.exe 1 4 2->13         started        signatures3 process4 signatures5 92 Windows Scripting host queries suspicious COM object (likely to drop second stage) 10->92 94 WScript reads language and country specific registry keys (likely country aware script) 10->94 15 XEPNWHDCEXSTVLBA.PIF 4 6 10->15         started        20 cmd.exe 1 13->20         started        22 conhost.exe 13->22         started        process6 dnsIp7 66 www.jahstandclassprojectbackup.com 198.12.83.76, 2404, 49713, 49714 AS-COLOCROSSING-HostPapaUS United States 15->66 54 C:\Users\user\...\ABLVTSXECDHWNPEX.url, MS 15->54 dropped 56 C:\Users\user\AppData\...\Login Data.tmp, SQLite 15->56 dropped 58 C:\Users\user\AppData\...\Login Data.tmp, SQLite 15->58 dropped 60 C:\Users\user\...\Login Data For Account.tmp, SQLite 15->60 dropped 68 Detected Remcos RAT 15->68 70 Tries to steal Mail credentials (via file registry) 15->70 72 Found API chain indicative of debugger detection 15->72 74 6 other signatures 15->74 24 cmd.exe 1 15->24         started        27 cmd.exe 1 15->27         started        29 cmd.exe 1 15->29         started        31 conhost.exe 15->31         started        33 XEPNWHDCEXSTVLBA.PIF 1 20->33         started        35 conhost.exe 20->35         started        file8 signatures9 process10 signatures11 84 Uses schtasks.exe or at.exe to add and modify task schedules 24->84 86 Uses whoami command line tool to query computer and username 24->86 37 whoami.exe 1 24->37         started        39 schtasks.exe 1 27->39         started        41 schtasks.exe 1 29->41         started        88 Detected Remcos RAT 33->88 90 Found direct / indirect Syscall (likely to bypass EDR) 33->90 43 cmd.exe 33->43         started        46 cmd.exe 33->46         started        48 conhost.exe 33->48         started        process12 signatures13 96 Uses whoami command line tool to query computer and username 43->96 50 whoami.exe 1 43->50         started        52 schtasks.exe 1 46->52         started        process14
Score:
99%
Verdict:
Malware
File Type:
SCRIPT
Link:
https://malprob.io/report/f73e99799f4ff717036cea15e6b3f2fb9b65da56906ae9d632a22b7ceb98ec3e
Gathering data
Detection:
remcos
Create hunting rule
Link:
https://mwdb.cert.pl/sample/f73e99799f4ff717036cea15e6b3f2fb9b65da56906ae9d632a22b7ceb98ec3e/
Threat name:
Script-JS.Dropper.ObfLoader
Create hunting rule
Status:
Malicious
First seen:
2026-08-04 04:03:14 UTC
File Type:
Text (JavaScript)
AV detection:
11 of 36 (30.56%)
Threat level:
  3/5
Detection(s):
Malicious file
Link:
https://check.spamhaus.org/check/?searchterm=647js6m7j73roa3m5ik6nm7s7onwlwswsbvotvrsuivxz24y5q7a._file
Verdict:
malicious
Label(s):
DonutLoader
Create hunting rule
Remcos
Create hunting rule
Link:
https://reports.threatray.com/a07a51b5-2df6-4d85-88fb-63d9dc507d28
Result
Malware family:
remcos
Create hunting rule
Score:
  10/10
Tags:
family:donutloader family:remcos botnet:remotehost collection discovery execution loader persistence rat spyware stealer suricata
Link:
https://tria.ge/reports/260804-k3l5nabp8v/
Behaviour
Modifies registry class
Scheduled Task/Job: Scheduled Task
Suspicious use of AdjustPrivilegeToken
Suspicious use of WriteProcessMemory
Uses Task Scheduler COM API
outlook_office_path
Command and Scripting Interpreter: JavaScript
Enumerates physical storage devices
Executes a command shell one-liner
Accesses Microsoft Outlook profiles
Checks installed software on the system
Checks computer location settings
Executes dropped EXE
Reads user/profile data of web browsers
Detects DonutLoader
Family: DonutLoader
Family: Remcos
Suricata alert: REMCOS RAT Malware Inbound C2 Communication
Suricata alert: REMCOS RAT Malware Outbound C2 Communication
Malware Config
C2 Extraction:
www.jahstandclassproject.com:2404
www.jahstandclassprojectbackup.com:2404
www.jahstandclassprojectbackup1.com:2404
www.jahstandclassprojectbackup2.com:2404
www.jahstandclassprojectbackup3.com:2404
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/f73e99799f4ff717036cea15e6b3f2fb9b65da56906ae9d632a22b7ceb98ec3e

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:golang_bin_JCorn_CSC846
Create hunting rule
Author:Justin Cornwell
Description:CSC-846 Golang detection ruleset
Rule name:INDICATOR_SUSPICIOUS_Binary_References_Browsers
Create hunting rule
Author:ditekSHen
Description:Detects binaries (Windows and macOS) referencing many web browsers. Observed in information stealers.
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:RANSOMWARE
Create hunting rule
Author:ToroGuitar
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:VECT_Ransomware
Create hunting rule
Author:Mustafa Bakhit
Description:Detects activity associated with VECT ransomware. This includes registry modifications and deletions, execution of system and defense-evasion commands, suspicious API usage, mutex creation, file and memory manipulation, ransomware note generation, anti-debugging and anti-analysis techniques, and embedded cryptographic constants (SHA256) characteristic of this malware family. Designed for threat intelligence and malware detection environments.
Rule name:Windows_Trojan_Remcos_921ef449
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_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