MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 81c7aaa41463ab95e180bdca4997b5ef54a97b107e425ff07bcb6edc8be52727. 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: 13

Intelligence 13 IOCs YARA 29 File information Comments

SHA256 hash:	81c7aaa41463ab95e180bdca4997b5ef54a97b107e425ff07bcb6edc8be52727
SHA3-384 hash:	3212a75820700b6e31c104fa6809beb24fe71e25e8d9cbba137456a333ba495653dff3d669c198d7af4892473e919a5c
SHA1 hash:	7d359533a36396e5a0005bbd979eef7165c216c1
MD5 hash:	14e62f6b8877254660d0fc2cd8c6fb3e
humanhash:	alabama-montana-angel-juliet
File name:	FACTR876500900087000.bat
Download:	download sample
Signature	RemcosRAT Create hunting rule
File size:	376'017 bytes
First seen:	2023-12-01 12:04:06 UTC
Last seen:	2023-12-01 13:23:10 UTC
File type:	exe
MIME type:	application/x-dosexec
imphash	b76363e9cb88bf9390860da8e50999d2 (464 x Formbook, 184 x AgentTesla, 122 x SnakeKeylogger)
ssdeep	6144:P8LxBsYA9YEjMVUa4/qxZ6grzhWqu7F/WMQ7zX7hLFe/d9iKCd1f8SLWWXx14z4Y:xYAF2UTCxIOzmRVQ7zX7BCd9mOSCWhCf
TLSH	T1008423272DE28A36D745C7F100B3A67FF3378975812346434F805E3653B2D6A9BA5127
TrID	47.3% (.EXE) Win32 Executable MS Visual C++ (generic) (31206/45/13) 15.9% (.EXE) Win64 Executable (generic) (10523/12/4) 9.9% (.DLL) Win32 Dynamic Link Library (generic) (6578/25/2) 7.6% (.EXE) Win16 NE executable (generic) (5038/12/1) 6.8% (.EXE) Win32 Executable (generic) (4505/5/1)
File icon (PE):
dhash icon	b2a89c96a2cada72 (2'283 x Formbook, 981 x Loki, 803 x AgentTesla)
Reporter	lowmal3
Tags:	exe RemcosRAT

Intelligence

File Origin

# of uploads :

# of downloads :

413

Origin country :

Vendor Threat Intelligence

Detection:

n/a

Link:

https://www.capesandbox.com/analysis/461706/

Result

Verdict:

Malware

Maliciousness:

Behaviour

Searching for the window

Creating a window

Creating a file in the %temp% directory

Creating a process from a recently created file

Creating a file in the %AppData% subdirectories

Сreating synchronization primitives

Setting a keyboard event handler

Sending a custom TCP request

DNS request

Sending an HTTP GET request

Creating a file

Reading critical registry keys

Enabling autorun with the standard Software\Microsoft\Windows\CurrentVersion\Run registry branch

Unauthorized injection to a recently created process by context flags manipulation

Unauthorized injection to a recently created process

Stealing user critical data

Gathering data

Verdict:

Malicious

Labled as:

Malware

Link:

https://www.hybrid-analysis.com/sample/81c7aaa41463ab95e180bdca4997b5ef54a97b107e425ff07bcb6edc8be52727

Malware family:

REMCOS

Verdict:

Malicious

Link:

https://analyze.intezer.com/analyses/2e550c77-23c3-412b-93b7-a5196d2ae257

Result

Threat name:

Remcos

Detection:

malicious

Classification:

rans.phis.troj.spyw.expl.evad

Score:

100 / 100

Link:

https://www.joesandbox.com/analysis/1351373

Behaviour

Behavior Graph:

n/a

Score:

98%

Verdict:

Malware

File Type:

Link:

https://malprob.io/report/81c7aaa41463ab95e180bdca4997b5ef54a97b107e425ff07bcb6edc8be52727

Detection:

remcos

Link:

https://mwdb.cert.pl/sample/81c7aaa41463ab95e180bdca4997b5ef54a97b107e425ff07bcb6edc8be52727/

Threat name:

Win32.Trojan.Remcosrat

Status:

Malicious

First seen:

2023-12-01 11:13:26 UTC

File Type:

PE (Exe)

Extracted files:

AV detection:

18 of 23 (78.26%)

Threat level:

5/5

Detection(s):

Malicious file

Link:

https://check.spamhaus.org/check/?searchterm=qhd2vjaumovzlymaxxfetf5v55kks6yqpzbf74d3znxnzc7fe4tq._file

Verdict:

malicious

Label(s):

remcos

Result

Malware family:

remcos

Score:

10/10

Tags:

family:remcos botnet:remotehost collection persistence rat spyware stealer upx

Link:

https://tria.ge/reports/231201-n86b9shf32/

Behaviour

Suspicious behavior: EnumeratesProcesses

Suspicious behavior: MapViewOfSection

Suspicious use of AdjustPrivilegeToken

Suspicious use of SetWindowsHookEx

Suspicious use of WriteProcessMemory

Enumerates physical storage devices

Suspicious use of SetThreadContext

Accesses Microsoft Outlook accounts

Adds Run key to start application

Executes dropped EXE

Loads dropped DLL

Reads user/profile data of web browsers

UPX packed file

NirSoft MailPassView

NirSoft WebBrowserPassView

Nirsoft

Remcos

Malware Config

C2 Extraction:

107.175.229.139:8087

Unpacked files

SH256 hash:

81c7aaa41463ab95e180bdca4997b5ef54a97b107e425ff07bcb6edc8be52727

MD5 hash:

14e62f6b8877254660d0fc2cd8c6fb3e

SHA1 hash:

7d359533a36396e5a0005bbd979eef7165c216c1

Link:

https://www.unpac.me/results/7ae92bff-b288-4131-9ba2-c4033caaaf11/

Malware family:

Remcos

Verdict:

Malicious

Link:

https://www.vmray.com/analyses/_mb/81c7aaa41463/report/overview.html

Please note that we are no longer able to provide a coverage score for Virus Total.

Threat name:

Remcos

Score:

0.90

Link:

https://yomi.yoroi.company/submissions/81c7aaa41463ab95e180bdca4997b5ef54a97b107e425ff07bcb6edc8be52727

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:	BLOWFISH_Constants Create hunting rule
Author:	phoul (@phoul)
Description:	Look for Blowfish constants

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_EXE_Packed_MPress Create hunting rule
Author:	ditekSHen
Description:	Detects executables built or packed with MPress PE compressor

Rule name:	INDICATOR_SUSPICIOUS_EXE_References_Confidential_Data_Store Create hunting rule
Author:	ditekSHen
Description:	Detects executables referencing many confidential data stores found in browsers, mail clients, cryptocurreny wallets, etc. Observed in information stealers

Rule name:	INDICATOR_SUSPICIOUS_EXE_References_Messaging_Clients Create hunting rule
Author:	ditekSHen
Description:	Detects executables referencing many email and collaboration clients. Observed in information stealers

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:	maldoc_getEIP_method_1 Create hunting rule
Author:	Didier Stevens (https://DidierStevens.com)

Rule name:	MD5_Constants Create hunting rule
Author:	phoul (@phoul)
Description:	Look for MD5 constants

Rule name:	meth_get_eip Create hunting rule
Author:	Willi Ballenthin

Rule name:	meth_stackstrings Create hunting rule
Author:	Willi Ballenthin

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

Rule name:	QbotStuff Create hunting rule
Author:	anonymous

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

Rule name:	REMCOS_RAT_variants Create hunting rule

Rule name:	RIPEMD160_Constants Create hunting rule
Author:	phoul (@phoul)
Description:	Look for RIPEMD-160 constants

Rule name:	SHA1_Constants Create hunting rule
Author:	phoul (@phoul)
Description:	Look for SHA1 constants

Rule name:	TeslaCryptPackedMalware 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

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

Rule name:	yara_template Create hunting rule

File information

The table below shows additional information about this malware sample such as delivery method and external references.

Malspam

RemcosRAT

exe 81c7aaa41463ab95e180bdca4997b5ef54a97b107e425ff07bcb6edc8be52727

(this sample)

Delivery method

Distributed via e-mail attachment

Cape

https://www.capesandbox.com/analysis/461706/

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