Analysis Overview
SHA256
aa4f91582c090e99b67390b61edf78df4525c6f2125c38a2a0b1a925bbe7fab4
Threat Level: Known bad
The file x1TYUNtEO1zz.exe was found to be: Known bad.
Malicious Activity Summary
Remcos family
Remcos
Executes dropped EXE
Loads dropped DLL
Checks computer location settings
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
Enterprise Matrix V15
Analysis: static1
Detonation Overview
Reported
2024-05-10 14:35
Signatures
Remcos family
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
Signatures
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
| 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 |
Suspicious use of WriteProcessMemory
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
Signatures
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
| 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 |
Suspicious use of WriteProcessMemory
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 |