Malware Analysis Report

2024-12-07 22:47

Sample ID 240512-dsejhagh96
Target bd8b7958eeae8d1adf54148d23079863.bin
SHA256 b7d1cc533889792230c79fbc2991ed3846ac76abfc2915c395eabb617159fc37
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

b7d1cc533889792230c79fbc2991ed3846ac76abfc2915c395eabb617159fc37

Threat Level: Known bad

The file bd8b7958eeae8d1adf54148d23079863.bin was found to be: Known bad.

Malicious Activity Summary

nuevos remcos persistence rat

Remcos

Remcos family

Loads dropped DLL

Checks computer location settings

Executes dropped EXE

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 03:15

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 03:15

Reported

2024-05-12 03:18

Platform

win7-20240221-en

Max time kernel

149s

Max time network

144s

Command Line

"C:\Users\Admin\AppData\Local\Temp\aa4f91582c090e99b67390b61edf78df4525c6f2125c38a2a0b1a925bbe7fab4.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\USER\S-1-5-21-1298544033-3225604241-2703760938-1000\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-1-5-21-1298544033-3225604241-2703760938-1000\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 2968 wrote to memory of 2564 N/A C:\Users\Admin\AppData\Local\Temp\aa4f91582c090e99b67390b61edf78df4525c6f2125c38a2a0b1a925bbe7fab4.exe C:\Windows\SysWOW64\WScript.exe
PID 2968 wrote to memory of 2564 N/A C:\Users\Admin\AppData\Local\Temp\aa4f91582c090e99b67390b61edf78df4525c6f2125c38a2a0b1a925bbe7fab4.exe C:\Windows\SysWOW64\WScript.exe
PID 2968 wrote to memory of 2564 N/A C:\Users\Admin\AppData\Local\Temp\aa4f91582c090e99b67390b61edf78df4525c6f2125c38a2a0b1a925bbe7fab4.exe C:\Windows\SysWOW64\WScript.exe
PID 2968 wrote to memory of 2564 N/A C:\Users\Admin\AppData\Local\Temp\aa4f91582c090e99b67390b61edf78df4525c6f2125c38a2a0b1a925bbe7fab4.exe C:\Windows\SysWOW64\WScript.exe
PID 2564 wrote to memory of 2580 N/A C:\Windows\SysWOW64\WScript.exe C:\Windows\SysWOW64\cmd.exe
PID 2564 wrote to memory of 2580 N/A C:\Windows\SysWOW64\WScript.exe C:\Windows\SysWOW64\cmd.exe
PID 2564 wrote to memory of 2580 N/A C:\Windows\SysWOW64\WScript.exe C:\Windows\SysWOW64\cmd.exe
PID 2564 wrote to memory of 2580 N/A C:\Windows\SysWOW64\WScript.exe C:\Windows\SysWOW64\cmd.exe
PID 2580 wrote to memory of 2608 N/A C:\Windows\SysWOW64\cmd.exe C:\Users\Admin\AppData\Roaming\data\notepads.exe
PID 2580 wrote to memory of 2608 N/A C:\Windows\SysWOW64\cmd.exe C:\Users\Admin\AppData\Roaming\data\notepads.exe
PID 2580 wrote to memory of 2608 N/A C:\Windows\SysWOW64\cmd.exe C:\Users\Admin\AppData\Roaming\data\notepads.exe
PID 2580 wrote to memory of 2608 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
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 a37a0094744ef4d0d66dd4d261120bcb
SHA1 b34b6447eaf4dfece4c6a1a828672cd41a633a8a
SHA256 37d8fc6add5203d1bbd6fb922890c8ab6e949fc7535a057a3d54f3a1c39bb1af
SHA512 9e95c76b4ba4fa7fc890e1f8d5d645cda651e436d9e77a925bdb3c4a9b559ad4cb896273004e1c2af47357dd6b1b1dbe6be0df298054a9eddb4cf2ae53dfbaa9

Analysis: behavioral2

Detonation Overview

Submitted

2024-05-12 03:15

Reported

2024-05-12 03:18

Platform

win10v2004-20240508-en

Max time kernel

149s

Max time network

151s

Command Line

"C:\Users\Admin\AppData\Local\Temp\aa4f91582c090e99b67390b61edf78df4525c6f2125c38a2a0b1a925bbe7fab4.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:\Windows\SysWOW64\WScript.exe N/A
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

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\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
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

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 17.160.190.20.in-addr.arpa udp
US 8.8.8.8:53 nuevosremcs.duckdns.org udp
SE 46.246.80.26:9090 nuevosremcs.duckdns.org tcp
NL 23.62.61.97:443 www.bing.com tcp
US 8.8.8.8:53 57.169.31.20.in-addr.arpa udp
US 8.8.8.8:53 97.61.62.23.in-addr.arpa udp
US 8.8.8.8:53 77.190.18.2.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 8.8.8.8:53 172.210.232.199.in-addr.arpa udp
US 8.8.8.8:53 198.187.3.20.in-addr.arpa udp
US 8.8.8.8:53 240.221.184.93.in-addr.arpa udp
US 8.8.8.8:53 79.190.18.2.in-addr.arpa udp
US 8.8.8.8:53 21.236.111.52.in-addr.arpa udp
US 8.8.8.8:53 5.173.189.20.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 a37a0094744ef4d0d66dd4d261120bcb
SHA1 b34b6447eaf4dfece4c6a1a828672cd41a633a8a
SHA256 37d8fc6add5203d1bbd6fb922890c8ab6e949fc7535a057a3d54f3a1c39bb1af
SHA512 9e95c76b4ba4fa7fc890e1f8d5d645cda651e436d9e77a925bdb3c4a9b559ad4cb896273004e1c2af47357dd6b1b1dbe6be0df298054a9eddb4cf2ae53dfbaa9