Malware Analysis Report

2025-01-02 03:43

Sample ID 240511-b6kxbsgh95
Target aa4f91582c090e99b67390b61edf78df4525c6f2125c38a2a0b1a925bbe7fab4.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 aa4f91582c090e99b67390b61edf78df4525c6f2125c38a2a0b1a925bbe7fab4.exe was found to be: Known bad.

Malicious Activity Summary

nuevos remcos persistence rat

Remcos

Remcos family

detects Windows exceutables potentially bypassing UAC using eventvwr.exe

detects Windows exceutables potentially bypassing UAC using eventvwr.exe

Checks computer location settings

Executes dropped EXE

Loads dropped DLL

Adds Run key to start application

Enumerates physical storage devices

Unsigned PE

Suspicious use of WriteProcessMemory

Modifies registry class

Suspicious use of SetWindowsHookEx

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-05-11 01:45

Signatures

Remcos family

remcos

detects Windows exceutables potentially bypassing UAC using eventvwr.exe

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

Unsigned PE

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

Analysis: behavioral1

Detonation Overview

Submitted

2024-05-11 01:45

Reported

2024-05-11 01:47

Platform

win7-20240508-en

Max time kernel

149s

Max time network

151s

Command Line

"C:\Users\Admin\AppData\Local\Temp\aa4f91582c090e99b67390b61edf78df4525c6f2125c38a2a0b1a925bbe7fab4.exe"

Signatures

Remcos

rat remcos

detects Windows exceutables potentially bypassing UAC using eventvwr.exe

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

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\USER\S-1-5-21-268080393-3149932598-1824759070-1000\Software\Microsoft\Windows\CurrentVersion\Run\system32 = "\"C:\\Users\\Admin\\AppData\\Roaming\\data\\notepads.exe\"" C:\Users\Admin\AppData\Local\Temp\aa4f91582c090e99b67390b61edf78df4525c6f2125c38a2a0b1a925bbe7fab4.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\aa4f91582c090e99b67390b61edf78df4525c6f2125c38a2a0b1a925bbe7fab4.exe N/A
Set value (str) \REGISTRY\USER\S-1-5-21-268080393-3149932598-1824759070-1000\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

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 1884 wrote to memory of 1984 N/A C:\Users\Admin\AppData\Local\Temp\aa4f91582c090e99b67390b61edf78df4525c6f2125c38a2a0b1a925bbe7fab4.exe C:\Windows\SysWOW64\WScript.exe
PID 1884 wrote to memory of 1984 N/A C:\Users\Admin\AppData\Local\Temp\aa4f91582c090e99b67390b61edf78df4525c6f2125c38a2a0b1a925bbe7fab4.exe C:\Windows\SysWOW64\WScript.exe
PID 1884 wrote to memory of 1984 N/A C:\Users\Admin\AppData\Local\Temp\aa4f91582c090e99b67390b61edf78df4525c6f2125c38a2a0b1a925bbe7fab4.exe C:\Windows\SysWOW64\WScript.exe
PID 1884 wrote to memory of 1984 N/A C:\Users\Admin\AppData\Local\Temp\aa4f91582c090e99b67390b61edf78df4525c6f2125c38a2a0b1a925bbe7fab4.exe C:\Windows\SysWOW64\WScript.exe
PID 1984 wrote to memory of 2684 N/A C:\Windows\SysWOW64\WScript.exe C:\Windows\SysWOW64\cmd.exe
PID 1984 wrote to memory of 2684 N/A C:\Windows\SysWOW64\WScript.exe C:\Windows\SysWOW64\cmd.exe
PID 1984 wrote to memory of 2684 N/A C:\Windows\SysWOW64\WScript.exe C:\Windows\SysWOW64\cmd.exe
PID 1984 wrote to memory of 2684 N/A C:\Windows\SysWOW64\WScript.exe C:\Windows\SysWOW64\cmd.exe
PID 2684 wrote to memory of 3068 N/A C:\Windows\SysWOW64\cmd.exe C:\Users\Admin\AppData\Roaming\data\notepads.exe
PID 2684 wrote to memory of 3068 N/A C:\Windows\SysWOW64\cmd.exe C:\Users\Admin\AppData\Roaming\data\notepads.exe
PID 2684 wrote to memory of 3068 N/A C:\Windows\SysWOW64\cmd.exe C:\Users\Admin\AppData\Roaming\data\notepads.exe
PID 2684 wrote to memory of 3068 N/A C:\Windows\SysWOW64\cmd.exe C:\Users\Admin\AppData\Roaming\data\notepads.exe

Processes

C:\Users\Admin\AppData\Local\Temp\aa4f91582c090e99b67390b61edf78df4525c6f2125c38a2a0b1a925bbe7fab4.exe

"C:\Users\Admin\AppData\Local\Temp\aa4f91582c090e99b67390b61edf78df4525c6f2125c38a2a0b1a925bbe7fab4.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
SE 46.246.80.26:9090 nuevosremcs.duckdns.org tcp
SE 46.246.80.26:9090 nuevosremcs.duckdns.org tcp
SE 46.246.80.26:9090 nuevosremcs.duckdns.org tcp
SE 46.246.80.26:9090 nuevosremcs.duckdns.org tcp
SE 46.246.80.26:9090 nuevosremcs.duckdns.org tcp
SE 46.246.80.26:9090 nuevosremcs.duckdns.org tcp
SE 46.246.80.26:9090 nuevosremcs.duckdns.org tcp
SE 46.246.80.26:9090 nuevosremcs.duckdns.org tcp
SE 46.246.80.26:9090 nuevosremcs.duckdns.org tcp
SE 46.246.80.26:9090 nuevosremcs.duckdns.org tcp
SE 46.246.80.26:9090 nuevosremcs.duckdns.org tcp
SE 46.246.80.26:9090 nuevosremcs.duckdns.org tcp
SE 46.246.80.26:9090 nuevosremcs.duckdns.org tcp
SE 46.246.80.26:9090 nuevosremcs.duckdns.org tcp
SE 46.246.80.26:9090 nuevosremcs.duckdns.org tcp
SE 46.246.80.26:9090 nuevosremcs.duckdns.org tcp
SE 46.246.80.26:9090 nuevosremcs.duckdns.org tcp
SE 46.246.80.26:9090 nuevosremcs.duckdns.org tcp
SE 46.246.80.26:9090 nuevosremcs.duckdns.org tcp
US 8.8.8.8:53 nuevosremcs.duckdns.org udp
SE 46.246.80.26:9090 nuevosremcs.duckdns.org tcp
SE 46.246.80.26:9090 nuevosremcs.duckdns.org tcp
SE 46.246.80.26:9090 nuevosremcs.duckdns.org tcp
SE 46.246.80.26:9090 nuevosremcs.duckdns.org tcp
SE 46.246.80.26:9090 nuevosremcs.duckdns.org tcp
SE 46.246.80.26:9090 nuevosremcs.duckdns.org tcp
SE 46.246.80.26:9090 nuevosremcs.duckdns.org tcp
SE 46.246.80.26:9090 nuevosremcs.duckdns.org tcp
SE 46.246.80.26:9090 nuevosremcs.duckdns.org tcp
SE 46.246.80.26:9090 nuevosremcs.duckdns.org tcp
SE 46.246.80.26:9090 nuevosremcs.duckdns.org tcp
SE 46.246.80.26:9090 nuevosremcs.duckdns.org tcp
SE 46.246.80.26:9090 nuevosremcs.duckdns.org tcp
SE 46.246.80.26:9090 nuevosremcs.duckdns.org tcp
SE 46.246.80.26:9090 nuevosremcs.duckdns.org tcp
SE 46.246.80.26:9090 nuevosremcs.duckdns.org tcp
SE 46.246.80.26:9090 nuevosremcs.duckdns.org tcp
SE 46.246.80.26:9090 nuevosremcs.duckdns.org tcp
SE 46.246.80.26:9090 nuevosremcs.duckdns.org tcp
SE 46.246.80.26:9090 nuevosremcs.duckdns.org tcp
US 8.8.8.8:53 nuevosremcs.duckdns.org udp
SE 46.246.80.26:9090 nuevosremcs.duckdns.org tcp
SE 46.246.80.26:9090 nuevosremcs.duckdns.org tcp
SE 46.246.80.26:9090 nuevosremcs.duckdns.org tcp
SE 46.246.80.26:9090 nuevosremcs.duckdns.org tcp
SE 46.246.80.26:9090 nuevosremcs.duckdns.org tcp
SE 46.246.80.26:9090 nuevosremcs.duckdns.org tcp
SE 46.246.80.26:9090 nuevosremcs.duckdns.org tcp
SE 46.246.80.26:9090 nuevosremcs.duckdns.org tcp
SE 46.246.80.26:9090 nuevosremcs.duckdns.org tcp
SE 46.246.80.26:9090 nuevosremcs.duckdns.org 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 bd8b7958eeae8d1adf54148d23079863
SHA1 5b48f72267da36089181f175b3ea111dc6274377
SHA256 aa4f91582c090e99b67390b61edf78df4525c6f2125c38a2a0b1a925bbe7fab4
SHA512 e494a21740da130d0f79dabde3611f78f5e3874cce59aee8203b1218466e58ac1a9e9483324b58a2c6ea4a7f07ced11497103fe393f931bba47956b7b1ed62e8

C:\ProgramData\notas\logs.dat

MD5 a71b397184525b553416c6c83f4770c0
SHA1 a0b80e9d89b7c28a69c36dcfbd39b18a06d5aabc
SHA256 bea557b881d4ac75ec3812dd883237cad531c963be60f6e2d8e46244ad9d8d3e
SHA512 785969cbcb707eaceb591bc35b569629f66cefdabb170b512d013cbf3c60f7e5216071f0cfa503bf1a0042f384499f7f9aca12165b6b412ab53cd5ce7e98983f

Analysis: behavioral2

Detonation Overview

Submitted

2024-05-11 01:45

Reported

2024-05-11 01:48

Platform

win10v2004-20240508-en

Max time kernel

149s

Max time network

153s

Command Line

"C:\Users\Admin\AppData\Local\Temp\aa4f91582c090e99b67390b61edf78df4525c6f2125c38a2a0b1a925bbe7fab4.exe"

Signatures

Remcos

rat remcos

detects Windows exceutables potentially bypassing UAC using eventvwr.exe

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

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\aa4f91582c090e99b67390b61edf78df4525c6f2125c38a2a0b1a925bbe7fab4.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\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\aa4f91582c090e99b67390b61edf78df4525c6f2125c38a2a0b1a925bbe7fab4.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\aa4f91582c090e99b67390b61edf78df4525c6f2125c38a2a0b1a925bbe7fab4.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

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\aa4f91582c090e99b67390b61edf78df4525c6f2125c38a2a0b1a925bbe7fab4.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\aa4f91582c090e99b67390b61edf78df4525c6f2125c38a2a0b1a925bbe7fab4.exe

"C:\Users\Admin\AppData\Local\Temp\aa4f91582c090e99b67390b61edf78df4525c6f2125c38a2a0b1a925bbe7fab4.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 nuevosremcs.duckdns.org udp
SE 46.246.80.26:9090 nuevosremcs.duckdns.org tcp
BE 2.17.196.137:443 www.bing.com tcp
US 8.8.8.8:53 172.210.232.199.in-addr.arpa udp
US 8.8.8.8:53 26.35.223.20.in-addr.arpa udp
US 8.8.8.8:53 137.196.17.2.in-addr.arpa udp
SE 46.246.80.26:9090 nuevosremcs.duckdns.org tcp
SE 46.246.80.26:9090 nuevosremcs.duckdns.org tcp
SE 46.246.80.26:9090 nuevosremcs.duckdns.org tcp
SE 46.246.80.26:9090 nuevosremcs.duckdns.org tcp
SE 46.246.80.26:9090 nuevosremcs.duckdns.org tcp
SE 46.246.80.26:9090 nuevosremcs.duckdns.org tcp
US 8.8.8.8:53 50.23.12.20.in-addr.arpa udp
US 8.8.8.8:53 206.23.85.13.in-addr.arpa udp
SE 46.246.80.26:9090 nuevosremcs.duckdns.org tcp
US 8.8.8.8:53 24.121.18.2.in-addr.arpa udp
SE 46.246.80.26:9090 nuevosremcs.duckdns.org tcp
SE 46.246.80.26:9090 nuevosremcs.duckdns.org tcp
SE 46.246.80.26:9090 nuevosremcs.duckdns.org tcp
SE 46.246.80.26:9090 nuevosremcs.duckdns.org tcp
US 8.8.8.8:53 nuevosremcs.duckdns.org udp
SE 46.246.80.26:9090 nuevosremcs.duckdns.org tcp
SE 46.246.80.26:9090 nuevosremcs.duckdns.org tcp
SE 46.246.80.26:9090 nuevosremcs.duckdns.org tcp
SE 46.246.80.26:9090 nuevosremcs.duckdns.org tcp
SE 46.246.80.26:9090 nuevosremcs.duckdns.org tcp
SE 46.246.80.26:9090 nuevosremcs.duckdns.org tcp
SE 46.246.80.26:9090 nuevosremcs.duckdns.org tcp
SE 46.246.80.26:9090 nuevosremcs.duckdns.org tcp
US 8.8.8.8:53 77.190.18.2.in-addr.arpa udp
US 8.8.8.8:53 31.243.111.52.in-addr.arpa udp
SE 46.246.80.26:9090 nuevosremcs.duckdns.org tcp
SE 46.246.80.26:9090 nuevosremcs.duckdns.org tcp
SE 46.246.80.26:9090 nuevosremcs.duckdns.org tcp
SE 46.246.80.26:9090 nuevosremcs.duckdns.org tcp
SE 46.246.80.26:9090 nuevosremcs.duckdns.org tcp
SE 46.246.80.26:9090 nuevosremcs.duckdns.org tcp
SE 46.246.80.26:9090 nuevosremcs.duckdns.org tcp
US 8.8.8.8:53 nuevosremcs.duckdns.org udp
SE 46.246.80.26:9090 nuevosremcs.duckdns.org tcp
SE 46.246.80.26:9090 nuevosremcs.duckdns.org tcp
SE 46.246.80.26:9090 nuevosremcs.duckdns.org tcp
SE 46.246.80.26:9090 nuevosremcs.duckdns.org tcp
SE 46.246.80.26:9090 nuevosremcs.duckdns.org tcp
SE 46.246.80.26:9090 nuevosremcs.duckdns.org 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 bd8b7958eeae8d1adf54148d23079863
SHA1 5b48f72267da36089181f175b3ea111dc6274377
SHA256 aa4f91582c090e99b67390b61edf78df4525c6f2125c38a2a0b1a925bbe7fab4
SHA512 e494a21740da130d0f79dabde3611f78f5e3874cce59aee8203b1218466e58ac1a9e9483324b58a2c6ea4a7f07ced11497103fe393f931bba47956b7b1ed62e8

C:\ProgramData\notas\logs.dat

MD5 d711a26c8ea12d49864f3d90296c2d1a
SHA1 319a84d52c136ac4de4171406242ced336b4da00
SHA256 1adcdf1f56e99395d7c937404dab8478a6c042f7c7da3287faa37c44d786f7f0
SHA512 1b0dc81ff55391fc51d5959cb7780a7f0332875a82b268f928f28353974b267d09c605ae05947fe1136cd9dd4a8482a42c79db09cfe1010815f5c9b864a74c39