MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 73c5b71d2923b11a8b262321c6229520c93115f82c78d742f041a650725d482f. 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: 14

Intelligence 14 IOCs YARA 3 File information Comments 1

SHA256 hash:	73c5b71d2923b11a8b262321c6229520c93115f82c78d742f041a650725d482f
SHA3-384 hash:	ed2c0d3ce999ad694f401ef1fddb147dbfbe70b90d1ecbf2004040a8547a0824c74f64f176d738071b893ada2080f572
SHA1 hash:	85de7e562d97c36b9318393fd6185df6b1ba55b9
MD5 hash:	b5b2948d407676eab86b1152e7ce5ec4
humanhash:	rugby-zebra-steak-avocado
File name:	b5b2948d407676eab86b1152e7ce5ec4
Download:	download sample
Signature	RemcosRAT Create hunting rule
File size:	65'425 bytes
First seen:	2024-03-30 08:29:47 UTC
Last seen:	2024-03-30 10:28:12 UTC
File type:	rtf
MIME type:	text/rtf
ssdeep	1536:fgoIW1uYod+RuUl9Zh7teyDdvqMhRSiupwk8uXjlh17AY9j:otyuYod+RuAZh84vSiowk8uXjlh17AYR
TLSH	T1B753F46AE34F0955DF55A73B034B4B8A09FCB73EB28140A1396C973437ADC2E466297C
Reporter	zbetcheckin
Tags:	CVE-2017-11882 RemcosRAT rtf

Intelligence

File Origin

# of uploads :

# of downloads :

139

Origin country :

Vendor Threat Intelligence

Malware family:

n/a

ID:

File name:

73c5b71d2923b11a8b262321c6229520c93115f82c78d742f041a650725d482f.rtf

Verdict:

Suspicious activity

Analysis date:

2024-03-30 08:31:03 UTC

Tags:

n/a

Link:

https://app.any.run/tasks/f56482bd-c75d-4f70-9723-56f0ac98ce49

Note:

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

Result

Verdict:

Malware

Maliciousness:

Behaviour

Creating a process with a hidden window

Launching a service

Possible injection to a system process

Searching for the window

Searching for synchronization primitives

Launching a process

Using the Windows Management Instrumentation requests

Creating a window

Sending an HTTP GET request to an infection source by exploiting the app vulnerability

Creating a file in the %AppData% directory

Сreating synchronization primitives

Changing an executable file

DNS request

Connection attempt

Sending a custom TCP request

Connection attempt to an infection source by exploiting the app vulnerability

Creating a process from a recently created file

Launching a file downloaded from the Internet

Result

Verdict:

Malicious

File Type:

RTF File

Link:

https://app.docguard.net/73c5b71d2923b11a8b262321c6229520c93115f82c78d742f041a650725d482f/results/dashboard

Behaviour

BlacklistAPI detected

Verdict:

Malicious

Threat level:

10/10

Confidence:

100%

Tags:

embedequation exploit shellcode

Link:

https://www.filescan.io/uploads/6607cd8ceda319274613278c/reports/77baa82c-7b9d-4834-896a-97d5070615a7/overview

Verdict:

Malicious

Labled as:

CVE-2017-11882

Link:

https://www.hybrid-analysis.com/sample/73c5b71d2923b11a8b262321c6229520c93115f82c78d742f041a650725d482f

Result

Verdict:

MALICIOUS

Result

Threat name:

Remcos

Detection:

malicious

Classification:

spre.phis.troj.spyw.expl.evad

Score:

100 / 100

Link:

https://www.joesandbox.com/analysis/1417759

Signature

Antivirus / Scanner detection for submitted sample

Antivirus detection for URL or domain

Bypasses PowerShell execution policy

C2 URLs / IPs found in malware configuration

Connects to a pastebin service (likely for C&C)

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

Creates autostart registry keys with suspicious values (likely registry only malware)

Delayed program exit found

Detected Remcos RAT

Document exploit detected (process start blacklist hit)

Found malware configuration

Injects a PE file into a foreign processes

Installs new ROOT certificates

Malicious sample detected (through community Yara rule)

Maps a DLL or memory area into another process

Multi AV Scanner detection for domain / URL

Multi AV Scanner detection for submitted file

Office equation editor establishes network connection

Office equation editor starts processes (likely CVE 2017-11882 or CVE-2018-0802)

Searches for Windows Mail specific files

Shellcode detected

Sigma detected: Base64 Encoded PowerShell Command Detected

Sigma detected: EQNEDT32.EXE connecting to internet

Sigma detected: Equation Editor Network Connection

Sigma detected: File Dropped By EQNEDT32EXE

Sigma detected: Potential PowerShell Obfuscation Via Reversed Commands

Sigma detected: PowerShell Base64 Encoded FromBase64String Cmdlet

Sigma detected: Powershell download and load assembly

Sigma detected: Powershell download payload from hardcoded c2 list

Sigma detected: Remcos

Sigma detected: Script Initiated Connection to Non-Local Network

Sigma detected: Suspicious Microsoft Office Child Process

Sigma detected: WScript or CScript Dropper

Snort IDS alert for network traffic

Suspicious execution chain found

Suspicious powershell command line found

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)

Very long command line found

Windows Scripting host queries suspicious COM object (likely to drop second stage)

Writes to foreign memory regions

Wscript starts Powershell (via cmd or directly)

Yara detected Generic Downloader

Yara detected Powershell download and execute

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:

SCRIPT

Link:

https://malprob.io/report/73c5b71d2923b11a8b262321c6229520c93115f82c78d742f041a650725d482f

Detection:

cve-2017-11882-shellcode

Link:

https://mwdb.cert.pl/sample/73c5b71d2923b11a8b262321c6229520c93115f82c78d742f041a650725d482f/

Threat name:

Document-Office.Exploit.CVE-2017-11882

Status:

Malicious

First seen:

2024-03-28 10:41:26 UTC

File Type:

Document

Extracted files:

AV detection:

16 of 24 (66.67%)

Threat level:

5/5

Detection(s):

Suspicious file

Link:

https://check.spamhaus.org/check/?searchterm=opc3ohjjeoyrvczgemq4miuvedetcfpyfr4noqxqigtfa4s5jaxq._file

Result

Malware family:

remcos

Score:

10/10

Tags:

family:remcos botnet:remotehost collection persistence rat spyware stealer

Link:

https://tria.ge/reports/240330-kd5kpsce23/

Behaviour

Checks processor information in registry

Enumerates system info in registry

Launches Equation Editor

Modifies Internet Explorer settings

Modifies registry class

Suspicious behavior: AddClipboardFormatListener

Suspicious behavior: EnumeratesProcesses

Suspicious behavior: MapViewOfSection

Suspicious use of AdjustPrivilegeToken

Suspicious use of SetWindowsHookEx

Suspicious use of WriteProcessMemory

Office loads VBA resources, possible macro or embedded object present

Enumerates physical storage devices

Drops file in Windows directory

Drops file in System32 directory

Suspicious use of SetThreadContext

Accesses Microsoft Outlook accounts

Adds Run key to start application

Reads user/profile data of web browsers

Blocklisted process makes network request

NirSoft MailPassView

NirSoft WebBrowserPassView

Nirsoft

Remcos

Malware Config

C2 Extraction:

107.172.31.178:2404

Malware family:

Remcos

Verdict:

Malicious

Link:

https://www.vmray.com/analyses/_mb/73c5b71d2923/report/overview.html

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

Threat name:

Legit

Score:

0.29

Link:

https://yomi.yoroi.company/submissions/73c5b71d2923b11a8b262321c6229520c93115f82c78d742f041a650725d482f

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:	INDICATOR_RTF_MalVer_Objects Create hunting rule
Author:	ditekSHen
Description:	Detects RTF documents with non-standard version and embeding one of the object mostly observed in exploit documents.

Rule name:	SUSP_INDICATOR_RTF_MalVer_Objects Create hunting rule
Author:	ditekSHen
Description:	Detects RTF documents with non-standard version and embedding one of the object mostly observed in exploit (e.g. CVE-2017-11882) documents.
Reference:	https://github.com/ditekshen/detection

File information

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

Web download

RemcosRAT

rtf 73c5b71d2923b11a8b262321c6229520c93115f82c78d742f041a650725d482f

(this sample)

Delivery method

Distributed via web download

URLhaus

https://urlhaus.abuse.ch/url/2796310/

Comments

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zbet commented on 2024-03-30 08:29:48 UTC

url : hxxp://103.237.87.56/xampp/fgh/fg/iwanttounderstandhowmuchilovertokissherwithlotoflovetounderstand___sheismygirlshemylovergirltoseeher.doc