Malware Analysis Report

2024-12-07 22:48

Sample ID 240512-cpr5rabg4y
Target 27bb3968cc18fb0df5b14e6d1b805552.bin
SHA256 4a7808cfcab27cb8f8498b5b4d1219ef0ef4982f805cbda5388062a26f794b7f
Tags
nuevos remcos persistence rat
score
10/10

Table of Contents

Analysis Overview

MITRE ATT&CK

Enterprise Matrix V15

Analysis: static1

Detonation Overview

Signatures

Analysis: behavioral1

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis: behavioral2

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis Overview

score
10/10

SHA256

4a7808cfcab27cb8f8498b5b4d1219ef0ef4982f805cbda5388062a26f794b7f

Threat Level: Known bad

The file 27bb3968cc18fb0df5b14e6d1b805552.bin was found to be: Known bad.

Malicious Activity Summary

nuevos remcos persistence rat

Remcos

Remcos family

Executes dropped EXE

Loads dropped DLL

Checks computer location settings

Adds Run key to start application

Unsigned PE

Enumerates physical storage devices

Suspicious use of SetWindowsHookEx

Suspicious use of WriteProcessMemory

Modifies registry class

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-05-12 02:15

Signatures

Remcos family

remcos

Unsigned PE

Description Indicator Process Target
N/A N/A N/A N/A

Analysis: behavioral1

Detonation Overview

Submitted

2024-05-12 02:15

Reported

2024-05-12 02:18

Platform

win7-20240508-en

Max time kernel

149s

Max time network

149s

Command Line

"C:\Users\Admin\AppData\Local\Temp\215292f9d78604f7d15cae869415f0a0269b7dd43b4986cad6a7d1b0c6cdb7dd.exe"

Signatures

Remcos

rat remcos

Executes dropped EXE

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Roaming\data\notepads.exe N/A

Loads dropped DLL

Description Indicator Process Target
N/A N/A C:\Windows\SysWOW64\cmd.exe N/A
N/A N/A C:\Windows\SysWOW64\cmd.exe N/A

Adds Run key to start application

persistence
Description Indicator Process Target
Set value (str) \REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Run\system32 = "\"C:\\Users\\Admin\\AppData\\Roaming\\data\\notepads.exe\"" C:\Users\Admin\AppData\Local\Temp\215292f9d78604f7d15cae869415f0a0269b7dd43b4986cad6a7d1b0c6cdb7dd.exe N/A
Set value (str) \REGISTRY\USER\S-1-5-21-3691908287-3775019229-3534252667-1000\Software\Microsoft\Windows\CurrentVersion\Run\system32 = "\"C:\\Users\\Admin\\AppData\\Roaming\\data\\notepads.exe\"" C:\Users\Admin\AppData\Roaming\data\notepads.exe N/A
Set value (str) \REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Run\system32 = "\"C:\\Users\\Admin\\AppData\\Roaming\\data\\notepads.exe\"" C:\Users\Admin\AppData\Roaming\data\notepads.exe N/A
Set value (str) \REGISTRY\USER\S-1-5-21-3691908287-3775019229-3534252667-1000\Software\Microsoft\Windows\CurrentVersion\Run\system32 = "\"C:\\Users\\Admin\\AppData\\Roaming\\data\\notepads.exe\"" C:\Users\Admin\AppData\Local\Temp\215292f9d78604f7d15cae869415f0a0269b7dd43b4986cad6a7d1b0c6cdb7dd.exe N/A

Enumerates physical storage devices

Suspicious use of SetWindowsHookEx

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Roaming\data\notepads.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 2420 wrote to memory of 2548 N/A C:\Users\Admin\AppData\Local\Temp\215292f9d78604f7d15cae869415f0a0269b7dd43b4986cad6a7d1b0c6cdb7dd.exe C:\Windows\SysWOW64\WScript.exe
PID 2420 wrote to memory of 2548 N/A C:\Users\Admin\AppData\Local\Temp\215292f9d78604f7d15cae869415f0a0269b7dd43b4986cad6a7d1b0c6cdb7dd.exe C:\Windows\SysWOW64\WScript.exe
PID 2420 wrote to memory of 2548 N/A C:\Users\Admin\AppData\Local\Temp\215292f9d78604f7d15cae869415f0a0269b7dd43b4986cad6a7d1b0c6cdb7dd.exe C:\Windows\SysWOW64\WScript.exe
PID 2420 wrote to memory of 2548 N/A C:\Users\Admin\AppData\Local\Temp\215292f9d78604f7d15cae869415f0a0269b7dd43b4986cad6a7d1b0c6cdb7dd.exe C:\Windows\SysWOW64\WScript.exe
PID 2548 wrote to memory of 2152 N/A C:\Windows\SysWOW64\WScript.exe C:\Windows\SysWOW64\cmd.exe
PID 2548 wrote to memory of 2152 N/A C:\Windows\SysWOW64\WScript.exe C:\Windows\SysWOW64\cmd.exe
PID 2548 wrote to memory of 2152 N/A C:\Windows\SysWOW64\WScript.exe C:\Windows\SysWOW64\cmd.exe
PID 2548 wrote to memory of 2152 N/A C:\Windows\SysWOW64\WScript.exe C:\Windows\SysWOW64\cmd.exe
PID 2152 wrote to memory of 1724 N/A C:\Windows\SysWOW64\cmd.exe C:\Users\Admin\AppData\Roaming\data\notepads.exe
PID 2152 wrote to memory of 1724 N/A C:\Windows\SysWOW64\cmd.exe C:\Users\Admin\AppData\Roaming\data\notepads.exe
PID 2152 wrote to memory of 1724 N/A C:\Windows\SysWOW64\cmd.exe C:\Users\Admin\AppData\Roaming\data\notepads.exe
PID 2152 wrote to memory of 1724 N/A C:\Windows\SysWOW64\cmd.exe C:\Users\Admin\AppData\Roaming\data\notepads.exe

Processes

C:\Users\Admin\AppData\Local\Temp\215292f9d78604f7d15cae869415f0a0269b7dd43b4986cad6a7d1b0c6cdb7dd.exe

"C:\Users\Admin\AppData\Local\Temp\215292f9d78604f7d15cae869415f0a0269b7dd43b4986cad6a7d1b0c6cdb7dd.exe"

C:\Windows\SysWOW64\WScript.exe

"C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\install.vbs"

C:\Windows\SysWOW64\cmd.exe

"C:\Windows\System32\cmd.exe" /c "C:\Users\Admin\AppData\Roaming\data\notepads.exe"

C:\Users\Admin\AppData\Roaming\data\notepads.exe

C:\Users\Admin\AppData\Roaming\data\notepads.exe

Network

Country Destination Domain Proto
US 8.8.8.8:53 nuevosremcs.duckdns.org udp
SE 46.246.80.26:9090 nuevosremcs.duckdns.org tcp
US 8.8.8.8:53 geoplugin.net udp
NL 178.237.33.50:80 geoplugin.net tcp

Files

C:\Users\Admin\AppData\Local\Temp\install.vbs

MD5 1653e8468b0d0cd87a484261da3a898b
SHA1 ab798bd56e8dfebf82b4feda4e1549778d19848b
SHA256 1bf4eaa1b06f079565ca6ea81082736efd1e25d6465c353ad992ba8c38940c3f
SHA512 5df77f64350879e22a6b9f018bdd8fcf90920cc9f4026ed9bf733b5e965214abd8c3643b211b2f814cd2a9e016f0c15762eaee133feef6ed5c37bdd66ff7be2f

C:\Users\Admin\AppData\Roaming\data\notepads.exe

MD5 27bb3968cc18fb0df5b14e6d1b805552
SHA1 8f44161a7c4e45422a5d179fbd1d1a81657d828c
SHA256 215292f9d78604f7d15cae869415f0a0269b7dd43b4986cad6a7d1b0c6cdb7dd
SHA512 c470ab75ae46a7161886b8e334143d373385efeb63afcb6f80317bcc0ed989bd3fbc97e87287a0aed8a4661b72261e1ceb94a2be263f25f00c935bad56bafc5d

C:\ProgramData\notas\logs.dat

MD5 871b72d6337aaf76fce3e1dc55e5c7e7
SHA1 465fdfa4c66bcf36469aa377cc024f311b77fd58
SHA256 d7ed6e53b90a39837119320f9f6d5c5169bfa594e4848266c80f0525f0683bc7
SHA512 64e157c0db76e70e6dcc1f0d7245f258f2689614ac8467e8b27929ac11783ff07aad61d28a7c254abf90d271edd8ae82cd03e5ef90d6562c83b36f0fc614a2b5

Analysis: behavioral2

Detonation Overview

Submitted

2024-05-12 02:15

Reported

2024-05-12 02:18

Platform

win10v2004-20240508-en

Max time kernel

149s

Max time network

140s

Command Line

"C:\Users\Admin\AppData\Local\Temp\215292f9d78604f7d15cae869415f0a0269b7dd43b4986cad6a7d1b0c6cdb7dd.exe"

Signatures

Remcos

rat remcos

Checks computer location settings

Description Indicator Process Target
Key value queried \REGISTRY\USER\S-1-5-21-1337824034-2731376981-3755436523-1000\Control Panel\International\Geo\Nation C:\Users\Admin\AppData\Local\Temp\215292f9d78604f7d15cae869415f0a0269b7dd43b4986cad6a7d1b0c6cdb7dd.exe N/A
Key value queried \REGISTRY\USER\S-1-5-21-1337824034-2731376981-3755436523-1000\Control Panel\International\Geo\Nation C:\Windows\SysWOW64\WScript.exe N/A

Executes dropped EXE

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Roaming\data\notepads.exe N/A

Adds Run key to start application

persistence
Description Indicator Process Target
Set value (str) \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\system32 = "\"C:\\Users\\Admin\\AppData\\Roaming\\data\\notepads.exe\"" C:\Users\Admin\AppData\Local\Temp\215292f9d78604f7d15cae869415f0a0269b7dd43b4986cad6a7d1b0c6cdb7dd.exe N/A
Set value (str) \REGISTRY\USER\S-1-5-21-1337824034-2731376981-3755436523-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\system32 = "\"C:\\Users\\Admin\\AppData\\Roaming\\data\\notepads.exe\"" C:\Users\Admin\AppData\Roaming\data\notepads.exe N/A
Set value (str) \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\system32 = "\"C:\\Users\\Admin\\AppData\\Roaming\\data\\notepads.exe\"" C:\Users\Admin\AppData\Roaming\data\notepads.exe N/A
Set value (str) \REGISTRY\USER\S-1-5-21-1337824034-2731376981-3755436523-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\system32 = "\"C:\\Users\\Admin\\AppData\\Roaming\\data\\notepads.exe\"" C:\Users\Admin\AppData\Local\Temp\215292f9d78604f7d15cae869415f0a0269b7dd43b4986cad6a7d1b0c6cdb7dd.exe N/A

Enumerates physical storage devices

Modifies registry class

Description Indicator Process Target
Key created \REGISTRY\USER\S-1-5-21-1337824034-2731376981-3755436523-1000_Classes\Local Settings C:\Users\Admin\AppData\Local\Temp\215292f9d78604f7d15cae869415f0a0269b7dd43b4986cad6a7d1b0c6cdb7dd.exe N/A

Suspicious use of SetWindowsHookEx

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Roaming\data\notepads.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\215292f9d78604f7d15cae869415f0a0269b7dd43b4986cad6a7d1b0c6cdb7dd.exe

"C:\Users\Admin\AppData\Local\Temp\215292f9d78604f7d15cae869415f0a0269b7dd43b4986cad6a7d1b0c6cdb7dd.exe"

C:\Windows\SysWOW64\WScript.exe

"C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\install.vbs"

C:\Windows\SysWOW64\cmd.exe

"C:\Windows\System32\cmd.exe" /c "C:\Users\Admin\AppData\Roaming\data\notepads.exe"

C:\Users\Admin\AppData\Roaming\data\notepads.exe

C:\Users\Admin\AppData\Roaming\data\notepads.exe

Network

Country Destination Domain Proto
US 8.8.8.8:53 8.8.8.8.in-addr.arpa udp
US 8.8.8.8:53 75.159.190.20.in-addr.arpa udp
US 8.8.8.8:53 nuevosremcs.duckdns.org udp
SE 46.246.80.26:9090 nuevosremcs.duckdns.org tcp
US 8.8.8.8:53 77.190.18.2.in-addr.arpa udp
NL 23.62.61.97:443 www.bing.com tcp
US 8.8.8.8:53 97.61.62.23.in-addr.arpa udp
US 8.8.8.8:53 26.80.246.46.in-addr.arpa udp
US 8.8.8.8:53 geoplugin.net udp
NL 178.237.33.50:80 geoplugin.net tcp
US 8.8.8.8:53 50.33.237.178.in-addr.arpa udp
US 8.8.8.8:53 103.169.127.40.in-addr.arpa udp
US 8.8.8.8:53 171.39.242.20.in-addr.arpa udp
US 8.8.8.8:53 31.121.18.2.in-addr.arpa udp
US 8.8.8.8:53 79.190.18.2.in-addr.arpa udp
US 8.8.8.8:53 48.229.111.52.in-addr.arpa udp

Files

C:\Users\Admin\AppData\Local\Temp\install.vbs

MD5 1653e8468b0d0cd87a484261da3a898b
SHA1 ab798bd56e8dfebf82b4feda4e1549778d19848b
SHA256 1bf4eaa1b06f079565ca6ea81082736efd1e25d6465c353ad992ba8c38940c3f
SHA512 5df77f64350879e22a6b9f018bdd8fcf90920cc9f4026ed9bf733b5e965214abd8c3643b211b2f814cd2a9e016f0c15762eaee133feef6ed5c37bdd66ff7be2f

C:\Users\Admin\AppData\Roaming\data\notepads.exe

MD5 27bb3968cc18fb0df5b14e6d1b805552
SHA1 8f44161a7c4e45422a5d179fbd1d1a81657d828c
SHA256 215292f9d78604f7d15cae869415f0a0269b7dd43b4986cad6a7d1b0c6cdb7dd
SHA512 c470ab75ae46a7161886b8e334143d373385efeb63afcb6f80317bcc0ed989bd3fbc97e87287a0aed8a4661b72261e1ceb94a2be263f25f00c935bad56bafc5d

C:\ProgramData\notas\logs.dat

MD5 4a4988592689303acec3b251ee76eb35
SHA1 3e393cb7027bc4a51d492a9950907146a88e45b9
SHA256 d43736afa32c1e0dd8107eeb49f1b31674f9c68d7bbce35173323d9a4c1c5862
SHA512 68f6a6f65938857e7ae022d79ce15c915e6d4c645fa5e46ef157098f2c8bc12b047e11f198d0bb933f2ef653c2db614413cb3e22a24d80ebf48266cf47e90228