MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 b4dada52fb6db354eb7f4e98cf1084561653f90ae839447f7dd5c3c64bcd83d6. 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: 16

Intelligence 16 IOCs YARA 15 File information Comments

SHA256 hash:	b4dada52fb6db354eb7f4e98cf1084561653f90ae839447f7dd5c3c64bcd83d6
SHA3-384 hash:	d5e75615bc99f2e5a142dd9afd1a6d9a1b0f335f876fc4c99c2597dfb15f4fbd26183e4d0387405dceebe5c3ac22c68c
SHA1 hash:	8fec85c7d406b6c8183e9852fe6c8607dcc06148
MD5 hash:	fb9562749f99396a0551ca703769245e
humanhash:	nebraska-freddie-helium-low
File name:	fb9562749f99396a0551ca703769245e.exe
Download:	download sample
Signature	RemcosRAT Create hunting rule
File size:	498'688 bytes
First seen:	2025-03-24 07:53:20 UTC
Last seen:	Never
File type:	exe
MIME type:	application/x-dosexec
imphash	41e05d591d7d93bdd5bc6d5da04da74b (52 x RemcosRAT, 1 x Expiro)
ssdeep	6144:PIlSCa0RPvRz+n8Qr1D0ZGESuHabmvHOE4mCp6qtydBnP+Y4+3sAORZGFX3Xc6pJ:P200OFp+G0imvHn3Cp6qyBP+YdsvZGz
Threatray	674 similar samples on MalwareBazaar
TLSH	T189B4BF01B9E2C172D57654300D2AE776DEBCBD2028358D7BB3D60D57FE30190AA39AB6
TrID	32.2% (.EXE) Win64 Executable (generic) (10522/11/4) 20.1% (.DLL) Win32 Dynamic Link Library (generic) (6578/25/2) 15.4% (.EXE) Win16 NE executable (generic) (5038/12/1) 13.7% (.EXE) Win32 Executable (generic) (4504/4/1) 6.2% (.EXE) OS/2 Executable (generic) (2029/13)
Magika	pebin
dhash icon	c4d48eaa8ad4d4f8 (1'000 x RemcosRAT, 1 x Worm.Ramnit, 1 x Vjw0rm)
Reporter	abuse_ch
Tags:	exe RAT RemcosRAT

Intelligence

File Origin

# of uploads :

# of downloads :

342

Origin country :

Vendor Threat Intelligence

Verdict:

Malicious

Score:

99.9%

Link:

https://cyber-fortress.com/docs/result/index.php?id=67e1999cbb84e066269e9690

Tags:

ransomware downloader dropper remcos

Result

Verdict:

Malware

Maliciousness:

Behaviour

Сreating synchronization primitives

DNS request

Launching a process

Connection attempt

Sending an HTTP GET request

Reading critical registry keys

Creating a file in the %temp% directory

Connection attempt to an infection source

Sending a TCP request to an infection source

Forced shutdown of a system process

Stealing user critical data

Unauthorized injection to a system process

Verdict:

Malicious

Threat level:

10/10

Confidence:

100%

Tags:

cmd config-extracted crypto evasive exploit explorer fingerprint fingerprint keylogger lolbin microsoft_visual_cc packed rat remcos remcos windows

Link:

https://www.filescan.io/uploads/67e10fdf3e6805386cfdcaca/reports/5e17d5af-71e2-4894-b416-9b2158c34b0f/overview

Verdict:

Malicious

Labled as:

Trojan.Remcos

Link:

https://www.hybrid-analysis.com/sample/b4dada52fb6db354eb7f4e98cf1084561653f90ae839447f7dd5c3c64bcd83d6

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.

Result

Threat name:

Remcos

Detection:

malicious

Classification:

rans.phis.troj.spyw.expl.evad

Score:

100 / 100

Link:

https://www.joesandbox.com/analysis/1646787

Behaviour

Behavior Graph:

n/a

Score:

100%

Verdict:

Malware

File Type:

Link:

https://malprob.io/report/b4dada52fb6db354eb7f4e98cf1084561653f90ae839447f7dd5c3c64bcd83d6

Detection:

remcos

Link:

https://mwdb.cert.pl/sample/b4dada52fb6db354eb7f4e98cf1084561653f90ae839447f7dd5c3c64bcd83d6/

Threat name:

Win32.Backdoor.Remcos

Status:

Malicious

First seen:

2025-03-24 01:01:13 UTC

File Type:

PE (Exe)

Extracted files:

AV detection:

30 of 36 (83.33%)

Threat level:

5/5

Detection(s):

Malicious file

Link:

https://check.spamhaus.org/check/?searchterm=wtnnuux3nwzvj237j2mm6eeekylfh6ik5a4ui7352xb4ms6nqpla._file

Verdict:

malicious

Label(s):

remcos

RemcosRAT

75fed14fd61067a1c0c2a10d0eefcc349308e1f4a1993a075a9f0c768affab13

RemcosRAT

7f7860172d4e076099724e55875a797b9206365a4e6f52cf93f57371fd7fcc82

RemcosRAT

88d5346489cca6b4114b60889108d286c46144507e2011081e0c7080eeb18d03

RemcosRAT

d3626bd96d6a11668a6864a514fa77ebb3372a5f88069b4aba668b773e3d6946

RemcosRAT

fa1c16a3024d35ebc4f6996d1791ead89a08dae2ebd87e39c9997c04613c4645

RemcosRAT

fa61518375428781260a99edf971bcc98b70df3e7c5d2887367393f4e206f30d

RemcosRAT

+ 664 additional samples on MalwareBazaar

Result

Malware family:

remcos

Score:

10/10

Tags:

family:remcos botnet:chinanew collection discovery

Link:

https://tria.ge/reports/250324-jrka9axkx8/

Behaviour

Suspicious behavior: EnumeratesProcesses

Suspicious behavior: MapViewOfSection

Suspicious use of AdjustPrivilegeToken

Suspicious use of WriteProcessMemory

System Location Discovery: System Language Discovery

Suspicious use of SetThreadContext

Accesses Microsoft Outlook accounts

Detected Nirsoft tools

NirSoft MailPassView

NirSoft WebBrowserPassView

Malware Config

C2 Extraction:

196.251.69.63:2721

Verdict:

Malicious

Tags:

rat remcos Win.Trojan.Remcos-9841897-0

YARA:

malware_windows_remcos_rat REMCOS_RAT_variants Remcos_Payload win_remcos_rat_unpacked Windows_Trojan_Remcos_b296e965 MAL_EXE_Remcos_RAT_Jul_22 Remcos

Link:

https://app.threat.zone/submission/8edbb3a1-946f-488c-8db3-fcaa20091210

Unpacked files

SH256 hash:

b4dada52fb6db354eb7f4e98cf1084561653f90ae839447f7dd5c3c64bcd83d6

MD5 hash:

fb9562749f99396a0551ca703769245e

SHA1 hash:

8fec85c7d406b6c8183e9852fe6c8607dcc06148

Detections:

win_remcos_w0

win_remcos_auto

Remcos

Link:

https://www.unpac.me/results/d10dc29f-6c6b-4119-b1b4-d86fbaaf64c4/

Malware family:

Remcos

Verdict:

Malicious

Link:

https://www.vmray.com/analyses/_mb/b4dada52fb6d/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:	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_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:	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:	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.

Web download

RemcosRAT

exe b4dada52fb6db354eb7f4e98cf1084561653f90ae839447f7dd5c3c64bcd83d6

(this sample)

URLhaus

https://urlhaus.abuse.ch/url/3488223/

Delivery method

Distributed via web download

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

ID	Title	Severity
CHECK_AUTHENTICODE	Missing Authenticode	high
CHECK_DLL_CHARACTERISTICS	Missing dll Security Characteristics (HIGH_ENTROPY_VA)	high
CHECK_NX	Missing Non-Executable Memory Protection	critical
CHECK_PIE	Missing Position-Independent Executable (PIE) Protection	high

Reviews

ID	Capabilities	Evidence
GDI_PLUS_API	Interfaces with Graphics	gdiplus.dll::GdiplusStartup gdiplus.dll::GdipGetImageEncodersSize gdiplus.dll::GdipGetImageEncoders gdiplus.dll::GdipAlloc
MULTIMEDIA_API	Can Play Multimedia	WINMM.dll::mciSendStringA WINMM.dll::mciSendStringW WINMM.dll::PlaySoundW WINMM.dll::waveInAddBuffer WINMM.dll::waveInClose WINMM.dll::waveInOpen
SECURITY_BASE_API	Uses Security Base API	ADVAPI32.dll::AdjustTokenPrivileges ADVAPI32.dll::GetTokenInformation
SHELL_API	Manipulates System Shell	SHELL32.dll::ShellExecuteExA SHELL32.dll::ShellExecuteW
URL_MONIKERS_API	Can Download & Execute components	urlmon.dll::URLDownloadToFileW urlmon.dll::URLOpenBlockingStreamW
WIN32_PROCESS_API	Can Create Process and Threads	KERNEL32.dll::CreateProcessW KERNEL32.dll::CreateProcessA KERNEL32.dll::OpenProcess ADVAPI32.dll::OpenProcessToken KERNEL32.dll::WriteProcessMemory KERNEL32.dll::CloseHandle WININET.dll::InternetCloseHandle
WIN_BASE_API	Uses Win Base API	KERNEL32.dll::TerminateProcess KERNEL32.dll::FindFirstVolumeW KERNEL32.dll::FindNextVolumeW KERNEL32.dll::LoadLibraryA KERNEL32.dll::LoadLibraryW KERNEL32.dll::LoadLibraryExW
WIN_BASE_EXEC_API	Can Execute other programs	KERNEL32.dll::AllocConsole KERNEL32.dll::WriteConsoleW KERNEL32.dll::ReadConsoleW KERNEL32.dll::SetConsoleOutputCP KERNEL32.dll::SetConsoleTextAttribute KERNEL32.dll::SetStdHandle
WIN_BASE_IO_API	Can Create Files	KERNEL32.dll::CopyFileW KERNEL32.dll::CreateDirectoryW KERNEL32.dll::CreateFileW KERNEL32.dll::DeleteFileW KERNEL32.dll::DeleteFileA KERNEL32.dll::MoveFileExW KERNEL32.dll::MoveFileW
WIN_BASE_USER_API	Retrieves Account Information	ADVAPI32.dll::GetUserNameW ADVAPI32.dll::LookupPrivilegeValueA KERNEL32.dll::QueryDosDeviceW
WIN_CRYPT_API	Uses Windows Crypt API	ADVAPI32.dll::CryptAcquireContextA ADVAPI32.dll::CryptGenRandom
WIN_REG_API	Can Manipulate Windows Registry	ADVAPI32.dll::RegCreateKeyExW ADVAPI32.dll::RegCreateKeyW ADVAPI32.dll::RegCreateKeyA ADVAPI32.dll::RegDeleteKeyA ADVAPI32.dll::RegOpenKeyExA ADVAPI32.dll::RegOpenKeyExW
WIN_SVC_API	Can Manipulate Windows Services	ADVAPI32.dll::ChangeServiceConfigW ADVAPI32.dll::ControlService ADVAPI32.dll::OpenSCManagerW ADVAPI32.dll::OpenSCManagerA ADVAPI32.dll::OpenServiceW ADVAPI32.dll::QueryServiceConfigW
WIN_USER_API	Performs GUI Actions	USER32.dll::AppendMenuA USER32.dll::EmptyClipboard USER32.dll::OpenClipboard USER32.dll::CreateWindowExA

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