Malware Analysis Report

2024-12-07 22:51

Sample ID 240510-rxz8naea66
Target x1TYUNtEO1zz.exe
SHA256 aa4f91582c090e99b67390b61edf78df4525c6f2125c38a2a0b1a925bbe7fab4
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

aa4f91582c090e99b67390b61edf78df4525c6f2125c38a2a0b1a925bbe7fab4

Threat Level: Known bad

The file x1TYUNtEO1zz.exe was found to be: Known bad.

Malicious Activity Summary

nuevos remcos persistence rat

Remcos family

Remcos

Checks computer location settings

Executes dropped EXE

Loads dropped DLL

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

2024-05-10 14:35

Signatures

Remcos family

remcos

Unsigned PE

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

Analysis: behavioral1

Detonation Overview

Submitted

2024-05-10 14:35

Reported

2024-05-10 14:37

Platform

win7-20240419-en

Max time kernel

149s

Max time network

151s

Command Line

"C:\Users\Admin\AppData\Local\Temp\x1TYUNtEO1zz.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\x1TYUNtEO1zz.exe N/A
Set value (str) \REGISTRY\USER\S-1-5-21-481678230-3773327859-3495911762-1000\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-1-5-21-481678230-3773327859-3495911762-1000\Software\Microsoft\Windows\CurrentVersion\Run\system32 = "\"C:\\Users\\Admin\\AppData\\Roaming\\data\\notepads.exe\"" C:\Users\Admin\AppData\Local\Temp\x1TYUNtEO1zz.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

Processes

C:\Users\Admin\AppData\Local\Temp\x1TYUNtEO1zz.exe

"C:\Users\Admin\AppData\Local\Temp\x1TYUNtEO1zz.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 46.246.82.10:9090 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

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

MD5 bd8b7958eeae8d1adf54148d23079863
SHA1 5b48f72267da36089181f175b3ea111dc6274377
SHA256 aa4f91582c090e99b67390b61edf78df4525c6f2125c38a2a0b1a925bbe7fab4
SHA512 e494a21740da130d0f79dabde3611f78f5e3874cce59aee8203b1218466e58ac1a9e9483324b58a2c6ea4a7f07ced11497103fe393f931bba47956b7b1ed62e8

C:\ProgramData\notas\logs.dat

MD5 0387395f108785e3e386f981b4c2d7e6
SHA1 11d8590bb886d44d9bde564d6718eef898e8f9a1
SHA256 b2048298aad4e973d099f9c8587864491d1c6c1e9c143ca345bcabb7c6a8dad3
SHA512 73d5b0198f45ef09ba901c43561c4d404bf502600d68432973617d626db6264d4add38a3be40b83e8cdfaee30184126e3586a08baeba68e4652f796f305b0c9d

Analysis: behavioral2

Detonation Overview

Submitted

2024-05-10 14:35

Reported

2024-05-10 14:37

Platform

win10v2004-20240508-en

Max time kernel

149s

Max time network

135s

Command Line

"C:\Users\Admin\AppData\Local\Temp\x1TYUNtEO1zz.exe"

Signatures

Remcos

rat remcos

Checks computer location settings

Description Indicator Process Target
Key value queried \REGISTRY\USER\S-1-5-21-2539840389-1261165778-1087677076-1000\Control Panel\International\Geo\Nation C:\Users\Admin\AppData\Local\Temp\x1TYUNtEO1zz.exe N/A
Key value queried \REGISTRY\USER\S-1-5-21-2539840389-1261165778-1087677076-1000\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\USER\S-1-5-21-2539840389-1261165778-1087677076-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\system32 = "\"C:\\Users\\Admin\\AppData\\Roaming\\data\\notepads.exe\"" C:\Users\Admin\AppData\Local\Temp\x1TYUNtEO1zz.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\Local\Temp\x1TYUNtEO1zz.exe N/A
Set value (str) \REGISTRY\USER\S-1-5-21-2539840389-1261165778-1087677076-1000\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

Enumerates physical storage devices

Modifies registry class

Description Indicator Process Target
Key created \REGISTRY\USER\S-1-5-21-2539840389-1261165778-1087677076-1000_Classes\Local Settings C:\Users\Admin\AppData\Local\Temp\x1TYUNtEO1zz.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\x1TYUNtEO1zz.exe

"C:\Users\Admin\AppData\Local\Temp\x1TYUNtEO1zz.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 46.246.82.10:9090 nuevosremcs.duckdns.org tcp
US 8.8.8.8:53 10.82.246.46.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 26.165.165.52.in-addr.arpa udp
US 8.8.8.8:53 172.210.232.199.in-addr.arpa udp
US 8.8.8.8:53 56.126.166.20.in-addr.arpa udp
US 8.8.8.8:53 139.53.16.96.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 bd8b7958eeae8d1adf54148d23079863
SHA1 5b48f72267da36089181f175b3ea111dc6274377
SHA256 aa4f91582c090e99b67390b61edf78df4525c6f2125c38a2a0b1a925bbe7fab4
SHA512 e494a21740da130d0f79dabde3611f78f5e3874cce59aee8203b1218466e58ac1a9e9483324b58a2c6ea4a7f07ced11497103fe393f931bba47956b7b1ed62e8

C:\ProgramData\notas\logs.dat

MD5 8aef52429755cc7d7019b06917fc54a2
SHA1 d49e47426f0003063d46bf2045fd47074a8d5fec
SHA256 15dda1d3edfb9a62ae6cb8b424a8ad2a048edab52cdff248d7a25c6ea27a82f0
SHA512 7908d292f89f1723424827d76a6bb5453e91b408af2acf0ebe4ccdbdd606fd956c901f545e372c0150050438bb402fd58f7137d2b4e7226b9fd8594b112e7a3e