MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 43a538ef95d4f931704d6309fa0a292f38abaeae48836f39115c0d3f4418fdec. 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: 17

Intelligence 17 IOCs YARA 35 File information Comments

SHA256 hash:	43a538ef95d4f931704d6309fa0a292f38abaeae48836f39115c0d3f4418fdec
SHA3-384 hash:	cddd682fa76a3ef8d075f4f2ce1934aa3329bebbd3bdf0b142a87fdc3df3a5e2af4179bb6f71eb13ab5aa7588f5b587b
SHA1 hash:	409ecf4cffd93d0f7b53a1fac76974ac2e16a13c
MD5 hash:	09756c5a4cac2682cce21a20c232236a
humanhash:	red-october-autumn-delta
File name:	173770140429ec23a52cd16b7a8e3525a94b45b4bca7cf45817219c8bcccd9014fd2ca6fbb158.dat-decoded
Download:	download sample
Signature	RemcosRAT Create hunting rule
File size:	571'847 bytes
First seen:	2025-01-24 06:50:06 UTC
Last seen:	Never
File type:	exe
MIME type:	application/x-dosexec
imphash	e77512f955eaf60ccff45e02d69234de (138 x RemcosRAT)
ssdeep	12288:X13akFMmBXTG4/1vQ8KI7ZnMEF76JqmsvZQcSoBjvrEH70SOP:FakOmBXTV/RQnEF76gFZjDrEH7kP
Threatray	284 similar samples on MalwareBazaar
TLSH	T1AFC4CF01B6D1C3F2D57154302C2AE775DEF8BC28183A897BA3D61D47FE38181963AA76
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
File icon (PE):
dhash icon	c4d48eaa8ad4d4f8 (1'000 x RemcosRAT, 1 x Worm.Ramnit, 1 x Vjw0rm)
Reporter	abuse_ch
Tags:	base64-decoded exe RemcosRAT

abuse_ch

Malware dropped as base64 encoded payload

Intelligence

File Origin

# of uploads :

# of downloads :

513

Origin country :

Vendor Threat Intelligence

Detection(s):

Win.Virus.Pioneer-9111434-0

Win.Trojan.Remcos-9841897-0

Win.Trojan.Remcos-10002580-0

Win.Virus.Pioneer-6804573-0

MiscreantPunch.SingleXOR.EXE.197.UNOFFICIAL

Gathering data

Result

Verdict:

Malware

Maliciousness:

Behaviour

Creating a file

Сreating synchronization primitives

Setting a keyboard event handler

DNS request

Connection attempt

Creating a file in the Program Files subdirectories

Sending an HTTP GET request

Replacing executable files

Creating a file in the mass storage device

Infecting executable files

Verdict:

Malicious

Threat level:

10/10

Confidence:

100%

Tags:

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

Link:

https://www.filescan.io/uploads/67933860fbe0ff41551eabb8/reports/cd474ceb-c641-4ec4-822d-5bfd14841b8c/overview

Verdict:

Malicious

Labled as:

Virus.Floxif

Link:

https://www.hybrid-analysis.com/sample/43a538ef95d4f931704d6309fa0a292f38abaeae48836f39115c0d3f4418fdec

Result

Verdict:

MALICIOUS

Malware family:

REMCOS

Verdict:

Malicious

Link:

https://analyze.intezer.com/analyses/c89e8933-793b-4d55-92ac-211b74fda9e1

Result

Threat name:

Remcos, FloodFix

Detection:

malicious

Classification:

spre.troj.spyw.expl

Score:

100 / 100

Link:

https://www.joesandbox.com/analysis/1598371

Signature

Antivirus / Scanner detection for submitted sample

Antivirus detection for dropped file

C2 URLs / IPs found in malware configuration

Detected Remcos RAT

Found malware configuration

Infects executable files (exe, dll, sys, html)

Installs a global keyboard hook

Joe Sandbox ML detected suspicious sample

Machine Learning detection for dropped file

Machine Learning detection for sample

Malicious sample detected (through community Yara rule)

Multi AV Scanner detection for submitted file

Sigma detected: Remcos

Suricata IDS alerts for network traffic

Yara detected FloodFix

Yara detected Remcos RAT

Yara detected UAC Bypass using CMSTP

Behaviour

Behavior Graph:

Download SVG

Score:

100%

Verdict:

Malware

File Type:

Link:

https://malprob.io/report/43a538ef95d4f931704d6309fa0a292f38abaeae48836f39115c0d3f4418fdec

Detection:

remcos

Link:

https://mwdb.cert.pl/sample/43a538ef95d4f931704d6309fa0a292f38abaeae48836f39115c0d3f4418fdec/

Threat name:

Win32.Virus.Floxif

Status:

Malicious

First seen:

2025-01-24 06:51:08 UTC

File Type:

PE (Exe)

Extracted files:

AV detection:

37 of 38 (97.37%)

Threat level:

5/5

Detection(s):

Suspicious file

Link:

https://check.spamhaus.org/check/?searchterm=iostr34v2t4tc4cnmme7ucrjf44kxlvojcbw6oirlqgt6ray7xwa._file

Verdict:

malicious

Label(s):

remcos

floxif

RemcosRAT

43a538ef95d4f931704d6309fa0a292f38abaeae48836f39115c0d3f4418fdec

RemcosRAT

6455edf671362bff99424c329856d1c28b02ed39c45dad8cfa2fda18e9ae236c

RemcosRAT

780eb8a7854cce92caadc3f3fd7532a87f91825a393fdc147762a968a06c4e6d

RemcosRAT

acce12489529441885f80ffaf7c7a9e7002947ac34ee12b9830ccea01b310e85

RemcosRAT

cb8db6079eda85eced81e830bc93137046d2380b1d9c6c09d7fa38b0d9d29400

RemcosRAT

eecc7116c5730d44a829ee1e1d91cada1e9deb98122b358503e493aa5e60087a

RemcosRAT

error

RemcosRAT

+ 274 additional samples on MalwareBazaar

Result

Malware family:

remcos

Score:

10/10

Tags:

family:floxif family:remcos botnet:enero 09 backdoor discovery persistence privilege_escalation rat trojan upx

Link:

https://tria.ge/reports/250124-hmg5navrds/

Behaviour

Suspicious behavior: EnumeratesProcesses

Suspicious use of AdjustPrivilegeToken

Suspicious use of SetWindowsHookEx

System Location Discovery: System Language Discovery

Drops file in Program Files directory

UPX packed file

Enumerates connected drives

ACProtect 1.3x - 1.4x DLL software

Loads dropped DLL

Event Triggered Execution: AppInit DLLs

Detects Floxif payload

Floxif family

Floxif, Floodfix

Remcos

Remcos family

Malware Config

C2 Extraction:

bienvenidoperezlora.kozow.com:1880

Verdict:

Malicious

Tags:

rat remcos dll floxif trojan Win.Virus.Pioneer-9111434-0

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 Malware_Floxif_mpsvc_dll Windows_Virus_Floxif_493d1897

Link:

https://app.threat.zone/submission/09ece1a6-c1c2-4bc1-a233-0b85f440219e

Unpacked files

SH256 hash:

43a538ef95d4f931704d6309fa0a292f38abaeae48836f39115c0d3f4418fdec

MD5 hash:

09756c5a4cac2682cce21a20c232236a

SHA1 hash:

409ecf4cffd93d0f7b53a1fac76974ac2e16a13c

Detections:

Remcos

win_remcos_auto

win_remcos_w0

Link:

https://www.unpac.me/results/af775c4e-c581-4ea1-b402-ac864e209fbd/

Malware family:

Floxif

Verdict:

Malicious

Link:

https://www.vmray.com/analyses/_mb/43a538ef95d4/report/overview.html

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/43a538ef95d4f931704d6309fa0a292f38abaeae48836f39115c0d3f4418fdec

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:	DebuggerException__SetConsoleCtrl 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_CMSTPCOM Create hunting rule
Author:	ditekSHen
Description:	Detects Windows exceutables bypassing UAC using CMSTP COM interfaces. MITRE (T1218.003)

Rule name:	Malware_Floxif_mpsvc_dll Create hunting rule
Author:	Florian Roth (Nextron Systems)
Description:	Malware - Floxif
Reference:	Internal Research

Rule name:	Malware_Floxif_mpsvc_dll_RID30C4 Create hunting rule
Author:	Florian Roth
Description:	Malware - Floxif
Reference:	Internal Research

Rule name:	MALWARE_Win_FloodFix Create hunting rule
Author:	ditekSHen
Description:	Detects FloodFix

Rule name:	MAL_Floxif_Generic Create hunting rule
Author:	Florian Roth (Nextron Systems)
Description:	Detects Floxif Malware
Reference:	Internal Research

Rule name:	MAL_Floxif_Generic_RID2DCE Create hunting rule
Author:	Florian Roth
Description:	Detects Floxif Malware
Reference:	Internal Research

Rule name:	meth_stackstrings Create hunting rule
Author:	Willi Ballenthin

Rule name:	pe_detect_tls_callbacks Create hunting rule

Rule name:	PE_Digital_Certificate Create hunting rule
Author:	albertzsigovits

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:	SUSP_Microsoft_Copyright_String_Anomaly_2 Create hunting rule
Author:	Florian Roth (Nextron Systems)
Description:	Detects Floxif Malware
Reference:	Internal Research

Rule name:	SUSP_Microsoft_Copyright_String_Anomaly_2_RID3720 Create hunting rule
Author:	Florian Roth
Description:	Detects Floxif Malware
Reference:	Internal Research

Rule name:	SUSP_XORed_MSDOS_Stub_Message Create hunting rule
Author:	Florian Roth
Description:	Detects suspicious XORed MSDOS stub message
Reference:	https://yara.readthedocs.io/en/latest/writingrules.html#xor-strings

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:	UPXV200V290MarkusOberhumerLaszloMolnarJohnReiser Create hunting rule
Author:	malware-lu

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:	Windows_Virus_Floxif_493d1897 Create hunting rule
Author:	Elastic Security

Rule name:	win_floxif_auto Create hunting rule
Author:	Felix Bilstein - yara-signator at cocacoding dot com
Description:	Detects win.floxif.

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

unknown 29ec23a52cd16b7a8e3525a94b45b4bca7cf45817219c8bcccd9014fd2ca6fbb

RemcosRAT

exe 43a538ef95d4f931704d6309fa0a292f38abaeae48836f39115c0d3f4418fdec

(this sample)

Dropped by

SHA256 29ec23a52cd16b7a8e3525a94b45b4bca7cf45817219c8bcccd9014fd2ca6fbb

Dropped by

MD5 8241c4f7067360e133b1c166ca3b42b0

URLhaus

https://urlhaus.abuse.ch/url/3412232/

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::GdipGetImageEncoders gdiplus.dll::GdipGetImageEncodersSize 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
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::LoadLibraryExW KERNEL32.dll::GetDriveTypeA
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::RegCreateKeyA ADVAPI32.dll::RegCreateKeyExW ADVAPI32.dll::RegCreateKeyW 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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