MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 b6ef9315154feca08a0c4e65b650af9cb30fba63be8739507d9cc76ad034ef55. 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 28 File information Comments

SHA256 hash:	b6ef9315154feca08a0c4e65b650af9cb30fba63be8739507d9cc76ad034ef55
SHA3-384 hash:	8401feaf1212b3296b4a5f0ca612588bfd383f1c8634817ff800955a22abf33e2187ebae72bc9090b9e5f2acb2ba5c39
SHA1 hash:	c51e9b32b39ab0bdc06055eaef3b38fc789844eb
MD5 hash:	87aca91fc9b0ce5a4bc495b90133319e
humanhash:	sixteen-leopard-double-batman
File name:	87ACA91FC9B0CE5A4BC495B90133319E.exe
Download:	download sample
Signature	RemcosRAT Create hunting rule
File size:	845'824 bytes
First seen:	2024-05-27 21:35:14 UTC
Last seen:	Never
File type:	exe
MIME type:	application/x-dosexec
imphash	fc6683d30d9f25244a50fd5357825e79 (92 x Formbook, 52 x AgentTesla, 23 x SnakeKeylogger)
ssdeep	24576:oBXu9HGaVHwqf4Xabh4SqgjBKgBRlWbAL:ow9VHwqf4WeSxdKA
TLSH	T1670512632BF29FCEC05F01F374E7AAA0EC4A49B6411D2654B4767E80E9759D890C23F9
TrID	31.3% (.EXE) UPX compressed Win32 Executable (27066/9/6) 30.7% (.EXE) Win32 EXE Yoda's Crypter (26569/9/4) 12.1% (.EXE) Win64 Executable (generic) (10523/12/4) 7.6% (.DLL) Win32 Dynamic Link Library (generic) (6578/25/2) 5.8% (.EXE) Win16 NE executable (generic) (5038/12/1)
File icon (PE):
dhash icon	92aca6aaaaa6acd0 (3 x AgentTesla, 2 x Formbook, 2 x RemcosRAT)
Reporter	abuse_ch
Tags:	exe RAT RemcosRAT

abuse_ch

RemcosRAT C2:
91.92.249.107:85

Intelligence

File Origin

# of uploads :

# of downloads :

367

Origin country :

Vendor Threat Intelligence

Malware family:

n/a

ID:

File name:

b6ef9315154feca08a0c4e65b650af9cb30fba63be8739507d9cc76ad034ef55.exe

Verdict:

Malicious activity

Analysis date:

2024-05-27 21:35:33 UTC

Tags:

n/a

Link:

https://app.any.run/tasks/e6f3d46d-ba39-4d5a-a092-ce93c4464c4e

Note:

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

Verdict:

Malicious

Score:

99.1%

Link:

https://cyber-fortress.com/docs/result/index.php?id=6654fccf02ef56c532bc5451win7simulatehigh_evasion

Tags:

Encryption Network Stealth Malware

Result

Verdict:

Malware

Maliciousness:

Behaviour

Searching for the window

Creating a window

Creating a file in the %temp% directory

Launching a process

Сreating synchronization primitives

Connecting to a non-recommended domain

Connection attempt

Sending a custom TCP request

DNS request

Sending an HTTP GET request

Reading critical registry keys

Stealing user critical data

Unauthorized injection to a system process

Verdict:

Likely Malicious

Threat level:

7.5/10

Confidence:

100%

Tags:

AutoIt lolbin packed packed packed shell32 upx

Link:

https://www.filescan.io/uploads/6654fcc432eca5b280001518/reports/f5fccc39-8bdf-4ea4-9875-2a77ac490eb0/overview

Verdict:

Malicious

Labled as:

Trojan.Generic

Link:

https://www.hybrid-analysis.com/sample/b6ef9315154feca08a0c4e65b650af9cb30fba63be8739507d9cc76ad034ef55

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.

Verdict:

Unknown

Link:

https://analyze.intezer.com/analyses/80679675-9b98-46ee-80ee-80660be5b14a

Result

Threat name:

Remcos

Detection:

malicious

Classification:

rans.phis.troj.spyw.expl.evad

Score:

100 / 100

Link:

https://www.joesandbox.com/analysis/1448135

Signature

AI detected suspicious sample

Antivirus / Scanner detection for submitted sample

Antivirus detection for URL or domain

Binary is likely a compiled AutoIt script file

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

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

Snort IDS alert for network traffic

System process connects to network (likely due to code injection or exploit)

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)

Writes to foreign memory regions

Yara detected Remcos RAT

Yara detected UAC Bypass using CMSTP

Yara detected WebBrowserPassView password recovery tool

Behaviour

Behavior Graph:

Download SVG

Score:

99%

Verdict:

Malware

File Type:

Link:

https://malprob.io/report/b6ef9315154feca08a0c4e65b650af9cb30fba63be8739507d9cc76ad034ef55

Detection:

remcos

Link:

https://mwdb.cert.pl/sample/b6ef9315154feca08a0c4e65b650af9cb30fba63be8739507d9cc76ad034ef55/

Threat name:

Win32.Trojan.AgentTesla

Status:

Malicious

First seen:

2024-05-22 12:41:17 UTC

File Type:

PE (Exe)

Extracted files:

AV detection:

20 of 24 (83.33%)

Threat level:

5/5

Detection(s):

Suspicious file

Link:

https://check.spamhaus.org/check/?searchterm=w3xzgfivj7wkbcqmjzs3mufptszq7otdx2dtsud5ttdwvubu55kq._file

Verdict:

malicious

Label(s):

remcos

Result

Malware family:

remcos

Score:

10/10

Tags:

family:remcos botnet:remotehost collection rat upx

Link:

https://tria.ge/reports/240527-1fwnksca38/

Behaviour

Suspicious behavior: EnumeratesProcesses

Suspicious behavior: MapViewOfSection

Suspicious use of AdjustPrivilegeToken

Suspicious use of FindShellTrayWindow

Suspicious use of SendNotifyMessage

Suspicious use of WriteProcessMemory

AutoIT Executable

Suspicious use of SetThreadContext

Accesses Microsoft Outlook accounts

UPX packed file

NirSoft MailPassView

NirSoft WebBrowserPassView

Nirsoft

Remcos

Malware Config

C2 Extraction:

91.92.249.107:85

Verdict:

Suspicious

Tags:

n/a

YARA:

n/a

Link:

https://app.threat.zone/submission/57540f33-f488-4942-973e-3e02ee9ebbae

Unpacked files

SH256 hash:

c81a2f95296ad97c4cbbf2d7650ee50332b0276a8b5819eadc6ebbc43bf09d21

MD5 hash:

5411f541fec5f1eec813fef6666ff644

SHA1 hash:

ce52920745c4604787b849eb66f339e2e001cc00

Detections:

Remcos

win_remcos_w0

win_remcos_auto

malware_windows_remcos_rat

INDICATOR_SUSPICIOUS_EXE_UACBypass_CMSTPCOM

Link:

https://www.unpac.me/results/58ba4ea6-ee1a-43ff-953a-7600105ed3ce/

Parent samples :

b6ef9315154feca08a0c4e65b650af9cb30fba63be8739507d9cc76ad034ef55
866f001abb38ad9d6f308804eedbcbb5a86e2847babbc275a6883726d96cc0be

SH256 hash:

4a7bbcda17d919ae9ef15995b5d29fb9d7e5d2df4190bb187596cd517bf4506a

MD5 hash:

3cd534d438c9bda0ced0a0d89415405f

SHA1 hash:

18807723feed2f1094aa67c116b02296e5f06b8e

Detections:

AutoIT_Compiled

Link:

https://www.unpac.me/results/58ba4ea6-ee1a-43ff-953a-7600105ed3ce/

SH256 hash:

b6ef9315154feca08a0c4e65b650af9cb30fba63be8739507d9cc76ad034ef55

MD5 hash:

87aca91fc9b0ce5a4bc495b90133319e

SHA1 hash:

c51e9b32b39ab0bdc06055eaef3b38fc789844eb

Detections:

SUSP_Imphash_Mar23_3

Link:

https://www.unpac.me/results/58ba4ea6-ee1a-43ff-953a-7600105ed3ce/

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/b6ef9315154feca08a0c4e65b650af9cb30fba63be8739507d9cc76ad034ef55

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:	SUSP_Imphash_Mar23_3 Create hunting rule
Author:	Arnim Rupp (https://github.com/ruppde)
Description:	Detects imphash often found in malware samples (Maximum 0,25% hits with search for 'imphash:x p:0' on Virustotal) = 99,75% hits
Reference:	Internal Research

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:	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

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.

No further information available

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

Reviews

ID	Capabilities	Evidence
AUTH_API	Manipulates User Authorization	ADVAPI32.dll::GetAce
MULTIMEDIA_API	Can Play Multimedia	WINMM.dll::timeGetTime
WIN_BASE_API	Uses Win Base API	KERNEL32.DLL::LoadLibraryA
WIN_NETWORK_API	Supports Windows Networking	MPR.dll::WNetUseConnectionW

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