MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 3799fefd99f0042be2e286b28b2902fd3a7ec31d812694ff7a96f266b11b8003. 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: 19


Intelligence 19 IOCs YARA 19 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: 3799fefd99f0042be2e286b28b2902fd3a7ec31d812694ff7a96f266b11b8003
SHA3-384 hash: bed047d7b3024ae9ac6bb55f51d60cf9a0e80e258c2bf70a074c37d8bfb44c2b6971ca04f931a5aa7f7d25baa8a4c09e
SHA1 hash: fbd003cdfb5156dcd47dbf0595efa37faaf05864
MD5 hash: 4e81c81c8ed02046d63589a6a109043d
humanhash: venus-jersey-green-fruit
File name:3799fefd99f0042be2e286b28b2902fd3a7ec31d812694ff7a96f266b11b8003
Download: download sample
Signature RemcosRAT
Create hunting rule
File size:1'163'776 bytes
First seen:2025-03-10 12:08:14 UTC
Last seen:Never
File type:Executable exe
MIME type:application/x-dosexec
imphash f34d5f2d4577ed6d9ceec516c1f5a744 (48'744 x AgentTesla, 19'611 x Formbook, 12'242 x SnakeKeylogger)
ssdeep 24576:eQ/ye/6xgls5Uc491favXSzuVUB2n38AhTyoiw:eQ/P6ij1SfSzuR8AhNi
Threatray 4'252 similar samples on MalwareBazaar
TLSH T1FB35F1041394CA19D43F2B786874C1314BB96D6EF962E31A5ED8BCEB7EB6B008D52347
TrID 71.1% (.EXE) Generic CIL Executable (.NET, Mono, etc.) (73123/4/13)
10.2% (.EXE) Win64 Executable (generic) (10522/11/4)
6.3% (.DLL) Win32 Dynamic Link Library (generic) (6578/25/2)
4.3% (.EXE) Win32 Executable (generic) (4504/4/1)
2.0% (.ICL) Windows Icons Library (generic) (2059/9)
Magika pebin
dhash icon f4fbb3e4e486d3e9 (7 x RemcosRAT, 4 x SnakeKeylogger, 3 x AgentTesla)
Reporter adrian__luca
Tags:exe RemcosRAT

Intelligence

File Origin
# of uploads :
1
# of downloads :
342
Origin country :
HU HU
Vendor Threat Intelligence
Malware family:
remcos
Create hunting rule
ID:
1
File name:
3799fefd99f0042be2e286b28b2902fd3a7ec31d812694ff7a96f266b11b8003
Verdict:
Malicious activity
Analysis date:
2025-03-10 17:47:32 UTC
Tags:
remcos rat
Link:
https://app.any.run/tasks/891d6a76-33f5-4854-b80a-45a8e5c061bc

Note:
ANY.RUN is an interactive sandbox that analyzes all user actions rather than an uploaded sample
Verdict:
Malicious
Score:
96.5%
Link:
https://cyber-fortress.com/docs/result/index.php?id=67cedeb20d1b39e3a208b92e
Tags:
remcos keylog msil word
Result
Verdict:
Malware
Maliciousness:

Behaviour
Searching for the window
Creating a window
Сreating synchronization primitives
Creating a file in the %AppData% directory
Enabling the 'hidden' option for recently created files
Adding an access-denied ACE
Creating a process with a hidden window
Creating a file in the %temp% directory
Launching a process
Unauthorized injection to a recently created process
Restart of the analyzed sample
Creating a file
Setting a keyboard event handler
DNS request
Connection attempt
Adding an exclusion to Microsoft Defender
Enabling autorun by creating a file
Verdict:
Suspicious
Threat level:
  5/10
Confidence:
100%
Tags:
obfuscated packed packed packer_detected vbnet
Link:
https://www.filescan.io/uploads/67ced66eb32a56d0c2cf36de/reports/7f258272-9ff3-4d23-83ee-5e52537d63c4/overview
Verdict:
Malicious
Labled as:
Trojan.Generic
Link:
https://www.hybrid-analysis.com/sample/3799fefd99f0042be2e286b28b2902fd3a7ec31d812694ff7a96f266b11b8003
Result
Verdict:
MALICIOUS
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/4984d1ae-9417-4ff5-967e-0e729d2c0559
Result
Threat name:
Remcos
Create hunting rule
Detection:
malicious
Classification:
rans.troj.spyw.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/1634592
Signature
.NET source code contains potential unpacker
Adds a directory exclusion to Windows Defender
Antivirus detection for URL or domain
C2 URLs / IPs found in malware configuration
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
Found malware configuration
Injects a PE file into a foreign processes
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 dropped file
Multi AV Scanner detection for submitted file
Sigma detected: Powershell Base64 Encoded MpPreference Cmdlet
Sigma detected: Remcos
Sigma detected: Scheduled temp file as task from temp location
Suricata IDS alerts for network traffic
Uses dynamic DNS services
Uses schtasks.exe or at.exe to add and modify task schedules
Yara detected AntiVM3
Yara detected Remcos RAT
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 dnsIp2 2 Behavior Graph ID: 1634592 Sample: b5q2QEIXKn.exe Startdate: 11/03/2025 Architecture: WINDOWS Score: 100 45 austin99.duckdns.org 2->45 47 sales778.bounceme.net 2->47 59 Suricata IDS alerts for network traffic 2->59 61 Found malware configuration 2->61 63 Malicious sample detected (through community Yara rule) 2->63 67 10 other signatures 2->67 8 b5q2QEIXKn.exe 7 2->8         started        12 rDjjAiTe.exe 5 2->12         started        signatures3 65 Uses dynamic DNS services 45->65 process4 file5 35 C:\Users\user\AppData\Roaming\rDjjAiTe.exe, PE32 8->35 dropped 37 C:\Users\...\rDjjAiTe.exe:Zone.Identifier, ASCII 8->37 dropped 39 C:\Users\user\AppData\Local\...\tmp6E5C.tmp, XML 8->39 dropped 41 C:\Users\user\AppData\...\b5q2QEIXKn.exe.log, ASCII 8->41 dropped 69 Uses schtasks.exe or at.exe to add and modify task schedules 8->69 71 Adds a directory exclusion to Windows Defender 8->71 73 Injects a PE file into a foreign processes 8->73 14 b5q2QEIXKn.exe 2 2 8->14         started        19 powershell.exe 23 8->19         started        21 schtasks.exe 1 8->21         started        75 Multi AV Scanner detection for dropped file 12->75 77 Contains functionalty to change the wallpaper 12->77 79 Contains functionality to steal Chrome passwords or cookies 12->79 81 3 other signatures 12->81 23 rDjjAiTe.exe 12->23         started        25 schtasks.exe 1 12->25         started        signatures6 process7 dnsIp8 49 103.186.117.61, 49697, 49701, 49704 AARNET-AS-APAustralianAcademicandResearchNetworkAARNe unknown 14->49 51 austin99.duckdns.org 185.213.83.33, 49693, 49698, 49703 QUICKPACKETUS Germany 14->51 43 C:\ProgramData\remcos\logs.dat, data 14->43 dropped 53 Detected Remcos RAT 14->53 55 Installs a global keyboard hook 14->55 57 Loading BitLocker PowerShell Module 19->57 27 WmiPrvSE.exe 19->27         started        29 conhost.exe 19->29         started        31 conhost.exe 21->31         started        33 conhost.exe 25->33         started        file9 signatures10 process11
Score:
100%
Verdict:
Malware
File Type:
PE
Link:
https://malprob.io/report/3799fefd99f0042be2e286b28b2902fd3a7ec31d812694ff7a96f266b11b8003
Detection:
remcos
Create hunting rule
Link:
https://mwdb.cert.pl/sample/3799fefd99f0042be2e286b28b2902fd3a7ec31d812694ff7a96f266b11b8003/
Threat name:
ByteCode-MSIL.Backdoor.Remcos
Create hunting rule
Status:
Malicious
First seen:
2025-03-10 12:09:12 UTC
File Type:
PE (.Net Exe)
Extracted files:
22
AV detection:
27 of 38 (71.05%)
Threat level:
  5/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=g6m757mz6accxyxcq2ziwkic7u5h5qy5qetjj732s3zgnmi3qabq._file
Verdict:
malicious
Label(s):
unc_loader_037
Create hunting rule
remcos
Create hunting rule
Similar samples:
06d30761437ffb30ac9ac077bb3761b5e4c077f3b74f8ed3b7372e104dccf83f
RemcosRAT
30a2111fc32aa43eb5e19bbe6a17b4653387dc46c7b4c90f2b735fd1e58a05a9
RemcosRAT
49e7ee12a475105efab2e363450b2e5582fc05d114967fe57a3d80d22a2fea81
RemcosRAT
a70404d3f9f9fc5e48ac266731e1b3b5a780ae9b0ba15e865418e5f908aa6178
RemcosRAT
c63200518fff185ffef5afbdbde74bc0ea703aade15e5d960f24d083d996db70
RemcosRAT
error
RemcosRAT
+ 4'242 additional samples on MalwareBazaar
Result
Malware family:
remcos
Create hunting rule
Score:
  10/10
Tags:
family:remcos botnet:feb 19 discovery execution rat
Link:
https://tria.ge/reports/250310-pbj87stycy/
Behaviour
Scheduled Task/Job: Scheduled Task
Suspicious behavior: EnumeratesProcesses
Suspicious use of AdjustPrivilegeToken
Suspicious use of SetWindowsHookEx
Suspicious use of WriteProcessMemory
System Location Discovery: System Language Discovery
Enumerates physical storage devices
Suspicious use of SetThreadContext
Checks computer location settings
Command and Scripting Interpreter: PowerShell
Remcos
Remcos family
Malware Config
C2 Extraction:
austin99.duckdns.org:9373
103.186.117.61:9373
sales778.bounceme.net:9373
Verdict:
Malicious
Tags:
Win.Packed.Nanocore-10020802-0
YARA:
n/a
Link:
https://app.threat.zone/submission/27b855dd-a523-436a-bed7-ad6e394ce6e8
Unpacked files
SH256 hash:
3799fefd99f0042be2e286b28b2902fd3a7ec31d812694ff7a96f266b11b8003
MD5 hash:
4e81c81c8ed02046d63589a6a109043d
SHA1 hash:
fbd003cdfb5156dcd47dbf0595efa37faaf05864
Link:
https://www.unpac.me/results/139d5a28-2676-4e37-a4de-b88c902be005/
SH256 hash:
e80a463e16b14b43e4112cb8f0cb0cf44ff245be592202042373a02b9ea4deb9
MD5 hash:
bbea1aafd0d7058f6f46c8ceff355f96
SHA1 hash:
14ca07073c0a943129823d6532358a55761a203f
Link:
https://www.unpac.me/results/139d5a28-2676-4e37-a4de-b88c902be005/
SH256 hash:
760021bfe7aa1c2cb4466189450fd1c044d0698888cf75cd925142b28d847e45
MD5 hash:
9c20e0039d35a3fec31749fd62640150
SHA1 hash:
cdd6fa9cd7bf0031d1ce5da8ad4e6858648e58aa
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/139d5a28-2676-4e37-a4de-b88c902be005/
SH256 hash:
237ff17159c54ff1b8e2413212a40db583cd8830f306e707bec82de87dbabfb9
MD5 hash:
7b42d1bf1d5358604fb11024b2d5fa0d
SHA1 hash:
f932583c9579239a9f54edebb6fc059df5d44baf
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_EventViewer
Create hunting rule
Link:
https://www.unpac.me/results/139d5a28-2676-4e37-a4de-b88c902be005/
Parent samples :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 family:
Remcos
Create hunting rule
Verdict:
Malicious
Link:
https://www.vmray.com/analyses/_mb/3799fefd99f0/report/overview.html
Please note that we are no longer able to provide a coverage score for Virus Total.

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:AgentTesla_DIFF_Common_Strings_01
Create hunting rule
Author:schmidtsz
Description:Identify partial Agent Tesla strings
Rule name:DebuggerCheck__API
Create hunting rule
Reference:https://github.com/naxonez/yaraRules/blob/master/AntiDebugging.yara
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_SUSPICIOUS_EXE_UACBypass_EventViewer
Create hunting rule
Author:ditekSHen
Description:detects Windows exceutables potentially bypassing UAC using eventvwr.exe
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_RAT_variants
Create hunting rule
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
CHECK_TRUST_INFORequires Elevated Execution (Unrestricted:true)high

Comments