MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 91e4bb8408db1e54d407d1859cbdde5c9df1a70c755474b5c7542ad661e30d00. 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 13 File information Comments

SHA256 hash:	91e4bb8408db1e54d407d1859cbdde5c9df1a70c755474b5c7542ad661e30d00
SHA3-384 hash:	4f58fc05422c27154c4ab952f2c1d1d79037dffda4667db6ddf7c36a8493b7b4aa58d3ed950cac556885924043bd021e
SHA1 hash:	7cbff5e6ba0f471116010ee8606686839e457193
MD5 hash:	ee688e51710c1934c41569aa9f163a7b
humanhash:	stairway-ceiling-coffee-timing
File name:	xIsAJb1izaR6.exe
Download:	download sample
Signature	RemcosRAT Create hunting rule
File size:	494'592 bytes
First seen:	2024-05-09 04:04:27 UTC
Last seen:	Never
File type:	exe
MIME type:	application/x-dosexec
imphash	8d5087ff5de35c3fbb9f212b47d63cad (170 x RemcosRAT)
ssdeep	6144:cXIktXfM8Lv86r9uVWAa2je4Z5zl4hgDHQQs4NTQjoHFsAOZZsAX4cNi5Gv:cX7tPMK8ctGe4Dzl4h2QnuPs/ZsHcv
Threatray	752 similar samples on MalwareBazaar
TLSH	T123B49E01BAD1C072D57524300D3AF776EAB8BD2028364A7B73D61D5BFE31190B62A6B7
TrID	32.2% (.EXE) Win64 Executable (generic) (10523/12/4) 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)
File icon (PE):
dhash icon	c4d48eaa8ad4d4f8 (1'000 x RemcosRAT, 1 x Worm.Ramnit, 1 x Vjw0rm)
Reporter	pmelson
Tags:	exe remcos RemcosRAT

Intelligence

File Origin

# of uploads :

# of downloads :

419

Origin country :

Vendor Threat Intelligence

Malware family:

remcos

ID:

File name:

91e4bb8408db1e54d407d1859cbdde5c9df1a70c755474b5c7542ad661e30d00.exe

Verdict:

Malicious activity

Analysis date:

2024-05-09 04:07:57 UTC

Tags:

rat remcos remote evasion

Link:

https://app.any.run/tasks/e8b664b3-ee39-4443-8395-b805580df0b8

Note:

ANY.RUN is an interactive sandbox that analyzes all user actions rather than an uploaded sample

Detection(s):

Win.Trojan.Remcos-9841897-0

Win.Trojan.Remcos-10002580-0

Result

Verdict:

Malware

Maliciousness:

Behaviour

Searching for the window

Сreating synchronization primitives

DNS request

Connection attempt

Sending a custom TCP request

Sending an HTTP GET request

Unauthorized injection to a recently created process

Restart of the analyzed sample

Reading critical registry keys

Creating a file in the %temp% directory

Stealing user critical data

Verdict:

Malicious

Threat level:

10/10

Confidence:

100%

Tags:

crypto evasive exploit explorer fingerprint fingerprint keylogger lolbin remcos shell32

Link:

https://www.filescan.io/uploads/663c4b72b8652ad994a2d1bb/reports/cbb11b8f-8e23-42f5-b00c-8f7d682abe11/overview

Verdict:

Malicious

Labled as:

Remcos.Generic

Link:

https://www.hybrid-analysis.com/sample/91e4bb8408db1e54d407d1859cbdde5c9df1a70c755474b5c7542ad661e30d00

Malware family:

REMCOS

Verdict:

Malicious

Link:

https://analyze.intezer.com/analyses/9ffe3a17-d076-4eaa-be40-751407ec56b8

Result

Threat name:

Remcos, PrivateLoader

Detection:

malicious

Classification:

rans.phis.troj.spyw.expl.evad

Score:

100 / 100

Link:

https://www.joesandbox.com/analysis/1438721

Signature

Antivirus / Scanner detection for submitted sample

Antivirus detection for URL or domain

C2 URLs / IPs found in malware configuration

Contains functionality to bypass UAC (CMSTPLUA)

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

Detected unpacking (changes PE section rights)

Found malware configuration

Machine Learning detection for sample

Malicious sample detected (through community Yara rule)

Maps a DLL or memory area into another process

Multi AV Scanner detection for submitted file

Sigma detected: Remcos

Tries to harvest and steal browser information (history, passwords, etc)

Tries to steal Instant Messenger accounts or passwords

Tries to steal Mail credentials (via file / registry access)

Tries to steal Mail credentials (via file registry)

Yara detected PrivateLoader

Yara detected Remcos RAT

Yara detected UAC Bypass using CMSTP

Yara detected WebBrowserPassView password recovery tool

Behaviour

Behavior Graph:

Download SVG

Score:

100%

Verdict:

Malware

File Type:

Link:

https://malprob.io/report/91e4bb8408db1e54d407d1859cbdde5c9df1a70c755474b5c7542ad661e30d00

Detection:

remcos

Link:

https://mwdb.cert.pl/sample/91e4bb8408db1e54d407d1859cbdde5c9df1a70c755474b5c7542ad661e30d00/

Threat name:

Win32.Backdoor.Remcos

Status:

Malicious

First seen:

2024-05-09 04:05:07 UTC

File Type:

PE (Exe)

Extracted files:

AV detection:

24 of 24 (100.00%)

Threat level:

5/5

Detection(s):

Suspicious file

Link:

https://check.spamhaus.org/check/?searchterm=shslxbai3mpfjvah2gczzpo6lso7djymovkhjnohkqvnmypdbuaa._file

Verdict:

malicious

Label(s):

remcos

RemcosRAT

10550a684e5af2a6affe1aab086f18790d137392a2a145103db87d2ea014dcbc

RemcosRAT

4c92e0337b78ef707dd9a448bdb2c52b803af673a5628154ea7bc6492e182342

RemcosRAT

5e4ac8eb80f59f5d1b0952665962a8d357ae28d1b62ae6825520864b90b53142

RemcosRAT

7038b1250cc9380861d92e721d364cb844459f87ecc3fe002b59e97d35926dfa

RemcosRAT

786bdc138493ae90d9a94a75e3c8900684f6854219d7698a22bf81cc2c32ef7c

RemcosRAT

d1836e6e0661938656d0d8883daa624f59b4a0885cd663be712bfa88a5ccea19

RemcosRAT

+ 742 additional samples on MalwareBazaar

Result

Malware family:

remcos

Score:

10/10

Tags:

family:remcos botnet:rs1_release collection rat spyware stealer

Link:

https://tria.ge/reports/240509-enhk2ace89/

Behaviour

Suspicious behavior: EnumeratesProcesses

Suspicious behavior: MapViewOfSection

Suspicious use of AdjustPrivilegeToken

Suspicious use of WriteProcessMemory

Suspicious use of SetThreadContext

Accesses Microsoft Outlook accounts

Reads user/profile data of web browsers

NirSoft MailPassView

NirSoft WebBrowserPassView

Nirsoft

Remcos

Malware Config

C2 Extraction:

dave17.bumbleshrimp.com:52182

Unpacked files

SH256 hash:

91e4bb8408db1e54d407d1859cbdde5c9df1a70c755474b5c7542ad661e30d00

MD5 hash:

ee688e51710c1934c41569aa9f163a7b

SHA1 hash:

7cbff5e6ba0f471116010ee8606686839e457193

Detections:

Remcos

win_remcos_w0

win_remcos_auto

malware_windows_remcos_rat

INDICATOR_SUSPICIOUS_EXE_UACBypass_CMSTPCOM

Link:

https://www.unpac.me/results/3ed2405c-6732-4aad-82a7-b83e628f459f/

Malware family:

Remcos

Verdict:

Malicious

Link:

https://www.vmray.com/analyses/_mb/91e4bb8408db/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/91e4bb8408db1e54d407d1859cbdde5c9df1a70c755474b5c7542ad661e30d00

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:	DebuggerCheck__API Create hunting rule
Reference:	https://github.com/naxonez/yaraRules/blob/master/AntiDebugging.yara

Rule name:	DebuggerCheck__QueryInfo Create hunting rule
Reference:	https://github.com/naxonez/yaraRules/blob/master/AntiDebugging.yara

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:	maldoc_find_kernel32_base_method_1 Create hunting rule
Author:	Didier Stevens (https://DidierStevens.com)

Rule name:	Remcos Create hunting rule
Author:	kevoreilly
Description:	Remcos Payload

Rule name:	REMCOS_RAT_variants Create hunting rule

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 91e4bb8408db1e54d407d1859cbdde5c9df1a70c755474b5c7542ad661e30d00

(this sample)

Link

https://www.virustotal.com/gui/file/91e4bb8408db1e54d407d1859cbdde5c9df1a70c755474b5c7542ad661e30d00/detection

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
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::LoadLibraryExW KERNEL32.dll::LoadLibraryA 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::CreateFileMappingW KERNEL32.dll::CreateFileW KERNEL32.dll::DeleteFileW KERNEL32.dll::DeleteFileA
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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