MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 043c2ea7473300aeef75d4347969ea2c54784e16892fb535b293b9dddb32b02d. 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: 15

Intelligence 15 IOCs YARA 19 File information Comments

SHA256 hash:	043c2ea7473300aeef75d4347969ea2c54784e16892fb535b293b9dddb32b02d
SHA3-384 hash:	6d19b9935bd63e21b404a5915d4714d82428df3a7d88401c56e46c9166b36662766a607888078ecf46c4caedbc712833
SHA1 hash:	b622b7dfb03b70219fe047abd365fe88a4316394
MD5 hash:	b0e371680c2c465a447d8cb4ad0ffa57
humanhash:	johnny-paris-gee-delaware
File name:	bUl0.exe
Download:	download sample
Signature	RemcosRAT Create hunting rule
File size:	238'592 bytes
First seen:	2024-03-19 08:07:24 UTC
Last seen:	Never
File type:	exe
MIME type:	application/x-dosexec
imphash	bc4f8e98d1041d53dd63bfb91ed10d0a (52 x RemcosRAT)
ssdeep	6144:4mvl3n8iOiB4RBucKa3h80tK2gBWvADGGw6j1:tvlX8i8RB5JvADGGnj
TLSH	T1953412942F26DC95F2C490F45401E1F472EA2C7A1EA7664D07E4BF17BC7E650BE8A063
TrID	54.9% (.EXE) UPX compressed Win32 Executable (27066/9/6) 13.3% (.DLL) Win32 Dynamic Link Library (generic) (6578/25/2) 10.2% (.EXE) Win16 NE executable (generic) (5038/12/1) 9.1% (.EXE) Win32 Executable (generic) (4504/4/1) 4.1% (.EXE) OS/2 Executable (generic) (2029/13)
File icon (PE):
dhash icon	c4d48eaa8ad4d4f8 (1'213 x RemcosRAT, 1 x Worm.Ramnit, 1 x Vjw0rm)
Reporter	pmelson
Tags:	exe remcos RemcosRAT

Intelligence

File Origin

# of uploads :

# of downloads :

456

Origin country :

Vendor Threat Intelligence

Malware family:

remcos

ID:

File name:

043c2ea7473300aeef75d4347969ea2c54784e16892fb535b293b9dddb32b02d.exe

Verdict:

Malicious activity

Analysis date:

2024-03-19 08:09:25 UTC

Tags:

rat remcos remote keylogger stealer

Link:

https://app.any.run/tasks/63422819-38cc-49d8-8264-969286a393ae

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

Setting a keyboard event handler

Connection attempt to an infection source

DNS request

Connection attempt

Sending an HTTP GET request

Creating a file

Unauthorized injection to a recently created process

Restart of the analyzed sample

Reading critical registry keys

Creating a file in the %temp% directory

Query of malicious DNS domain

Sending a TCP request to an infection source

Stealing user critical data

Verdict:

Malicious

Threat level:

10/10

Confidence:

100%

Tags:

crypto evasive fingerprint hook keylogger lolbin packed packed packed rat shell32 upx

Link:

https://www.filescan.io/uploads/65f947e20ef6f5eba494faf0/reports/0f620e8d-1d77-4fb5-987e-c3be70cdd85b/overview

Verdict:

Malicious

Labled as:

Backdoor.Remcos

Link:

https://www.hybrid-analysis.com/sample/043c2ea7473300aeef75d4347969ea2c54784e16892fb535b293b9dddb32b02d

Malware family:

REMCOS

Verdict:

Malicious

Link:

https://analyze.intezer.com/analyses/1f52cc20-ddf3-4aed-9a4e-068fbd46254b

Result

Threat name:

n/a

Detection:

clean

Classification:

n/a

Score:

0 / 100

Link:

https://www.joesandbox.com/analysis/1411518

Behaviour

Behavior Graph:

n/a

Score:

100%

Verdict:

Malware

File Type:

Link:

https://malprob.io/report/043c2ea7473300aeef75d4347969ea2c54784e16892fb535b293b9dddb32b02d

Detection:

remcos

Link:

https://mwdb.cert.pl/sample/043c2ea7473300aeef75d4347969ea2c54784e16892fb535b293b9dddb32b02d/

Threat name:

Win32.Trojan.Remcos

Status:

Malicious

First seen:

2024-03-19 08:08:04 UTC

File Type:

PE (Exe)

Extracted files:

AV detection:

23 of 24 (95.83%)

Threat level:

5/5

Detection(s):

Suspicious file

Link:

https://check.spamhaus.org/check/?searchterm=aq6c5j2hgmak533v2q2hs2pkfrkhqtqwrex3knnsso453wzswawq._file

Verdict:

malicious

Label(s):

remcos

Result

Malware family:

remcos

Score:

10/10

Tags:

family:remcos botnet:chuk collection rat spyware stealer upx

Link:

https://tria.ge/reports/240319-j1jq3sfb9v/

Behaviour

Suspicious behavior: EnumeratesProcesses

Suspicious behavior: MapViewOfSection

Suspicious use of AdjustPrivilegeToken

Suspicious use of SetWindowsHookEx

Suspicious use of WriteProcessMemory

Suspicious use of SetThreadContext

Accesses Microsoft Outlook accounts

Reads user/profile data of web browsers

UPX packed file

NirSoft MailPassView

NirSoft WebBrowserPassView

Nirsoft

Remcos

Malware Config

C2 Extraction:

mexbar.duckdns.org:3119
chukwuonye.duckdns.org:3241

Unpacked files

SH256 hash:

11edd4684a474bc57d84a950d93b32f9f5c7bf64ac366426e04440ed3a3e448d

MD5 hash:

9472b863e5729154021a7421f548dbe4

SHA1 hash:

74d609b0951a30e5a08ec24ee7a492dc7fe74244

Detections:

Remcos

win_remcos_w0

win_remcos_auto

Link:

https://www.unpac.me/results/12c8233d-3dcc-452d-8bae-5dbde7065bc6/

SH256 hash:

043c2ea7473300aeef75d4347969ea2c54784e16892fb535b293b9dddb32b02d

MD5 hash:

b0e371680c2c465a447d8cb4ad0ffa57

SHA1 hash:

b622b7dfb03b70219fe047abd365fe88a4316394

Link:

https://www.unpac.me/results/12c8233d-3dcc-452d-8bae-5dbde7065bc6/

Malware family:

Remcos

Verdict:

Malicious

Link:

https://www.vmray.com/analyses/_mb/043c2ea74733/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:	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:	UPXV200V290MarkusOberhumerLaszloMolnarJohnReiser Create hunting rule
Author:	malware-lu

Rule name:	UPXv20MarkusLaszloReiser Create hunting rule
Author:	malware-lu

Rule name:	upx_3 Create hunting rule
Author:	Kevin Falcoz
Description:	UPX 3.X

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_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 043c2ea7473300aeef75d4347969ea2c54784e16892fb535b293b9dddb32b02d

(this sample)

Link

https://www.virustotal.com/gui/file/043c2ea7473300aeef75d4347969ea2c54784e16892fb535b293b9dddb32b02d/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
MULTIMEDIA_API	Can Play Multimedia	WINMM.dll::waveInOpen
URL_MONIKERS_API	Can Download & Execute components	urlmon.dll::URLDownloadToFileW
WIN_BASE_API	Uses Win Base API	KERNEL32.DLL::LoadLibraryA

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