Analysis Overview
SHA256
4311ee23e9f4cb3432d3b0a5a78b020f89494063ba1d870298f2117970879e37
Threat Level: Known bad
The file Updater.exe was found to be: Known bad.
Malicious Activity Summary
UAC bypass
Remcos family
Remcos
Adds policy Run key to start application
Deletes itself
Adds Run key to start application
Suspicious use of SetThreadContext
Drops file in System32 directory
Unsigned PE
Enumerates physical storage devices
System Location Discovery: System Language Discovery
Suspicious behavior: EnumeratesProcesses
Suspicious use of WriteProcessMemory
Modifies registry key
Suspicious behavior: MapViewOfSection
MITRE ATT&CK
Enterprise Matrix V15
Analysis: static1
Detonation Overview
Reported
2024-08-14 15:15
Signatures
Remcos family
Unsigned PE
| Description | Indicator | Process | Target |
| N/A | N/A | N/A | N/A |
Analysis: behavioral1
Detonation Overview
Submitted
2024-08-14 15:15
Reported
2024-08-14 15:16
Platform
win10v2004-20240802-en
Max time kernel
82s
Max time network
84s
Command Line
Signatures
Remcos
UAC bypass
| Description | Indicator | Process | Target |
| Set value (int) | \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0" | C:\Windows\SysWOW64\reg.exe | N/A |
| Set value (int) | \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0" | C:\Windows\SysWOW64\reg.exe | N/A |
Adds policy Run key to start application
| Description | Indicator | Process | Target |
| Key created | \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run | C:\Users\Admin\AppData\Local\Temp\Updater.exe | N/A |
| Set value (str) | \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run\Rmc-YXZARA = "\"C:\\Windows\\SysWOW64\\Remcos\\$77-Installer\"" | C:\Users\Admin\AppData\Local\Temp\Updater.exe | N/A |
| Key created | \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run | \??\c:\program files (x86)\internet explorer\iexplore.exe | N/A |
| Set value (str) | \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run\Rmc-YXZARA = "\"C:\\Windows\\SysWOW64\\Remcos\\$77-Installer\"" | \??\c:\program files (x86)\internet explorer\iexplore.exe | N/A |
Deletes itself
| Description | Indicator | Process | Target |
| N/A | N/A | \??\c:\program files (x86)\internet explorer\iexplore.exe | N/A |
Adds Run key to start application
| Description | Indicator | Process | Target |
| Set value (str) | \REGISTRY\USER\S-1-5-21-2412658365-3084825385-3340777666-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Rmc-YXZARA = "\"C:\\Windows\\SysWOW64\\Remcos\\$77-Installer\"" | C:\Users\Admin\AppData\Local\Temp\Updater.exe | N/A |
| Set value (str) | \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\Rmc-YXZARA = "\"C:\\Windows\\SysWOW64\\Remcos\\$77-Installer\"" | C:\Users\Admin\AppData\Local\Temp\Updater.exe | N/A |
| Set value (str) | \REGISTRY\USER\S-1-5-21-2412658365-3084825385-3340777666-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Rmc-YXZARA = "\"C:\\Windows\\SysWOW64\\Remcos\\$77-Installer\"" | \??\c:\program files (x86)\internet explorer\iexplore.exe | N/A |
| Set value (str) | \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\Rmc-YXZARA = "\"C:\\Windows\\SysWOW64\\Remcos\\$77-Installer\"" | \??\c:\program files (x86)\internet explorer\iexplore.exe | N/A |
Drops file in System32 directory
| Description | Indicator | Process | Target |
| File created | C:\Windows\SysWOW64\Remcos\$77-Installer | C:\Users\Admin\AppData\Local\Temp\Updater.exe | N/A |
| File opened for modification | C:\Windows\SysWOW64\Remcos\$77-Installer | C:\Users\Admin\AppData\Local\Temp\Updater.exe | N/A |
| File opened for modification | C:\Windows\SysWOW64\Remcos | C:\Users\Admin\AppData\Local\Temp\Updater.exe | N/A |
Suspicious use of SetThreadContext
| Description | Indicator | Process | Target |
| PID 1256 set thread context of 2660 | N/A | C:\Users\Admin\AppData\Local\Temp\Updater.exe | \??\c:\program files (x86)\internet explorer\iexplore.exe |
| PID 2660 set thread context of 3876 | N/A | \??\c:\program files (x86)\internet explorer\iexplore.exe | C:\Windows\SysWOW64\svchost.exe |
Enumerates physical storage devices
System Location Discovery: System Language Discovery
| Description | Indicator | Process | Target |
| Key opened | \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language | C:\Windows\SysWOW64\reg.exe | N/A |
| Key opened | \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language | C:\Users\Admin\Downloads\NecroObfuscator\NecroObfuscator\NecroObfuscator.exe | N/A |
| Key opened | \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language | C:\Users\Admin\AppData\Local\Temp\Updater.exe | N/A |
| Key opened | \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language | C:\Windows\SysWOW64\cmd.exe | N/A |
| Key opened | \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language | C:\Windows\SysWOW64\reg.exe | N/A |
| Key opened | \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language | \??\c:\program files (x86)\internet explorer\iexplore.exe | N/A |
| Key opened | \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language | C:\Windows\SysWOW64\cmd.exe | N/A |
Modifies registry key
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windows\SysWOW64\reg.exe | N/A |
| N/A | N/A | C:\Windows\SysWOW64\reg.exe | N/A |
Suspicious behavior: EnumeratesProcesses
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Users\Admin\AppData\Local\Temp\Updater.exe | N/A |
| N/A | N/A | C:\Users\Admin\AppData\Local\Temp\Updater.exe | N/A |
Suspicious behavior: MapViewOfSection
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Users\Admin\AppData\Local\Temp\Updater.exe | N/A |
| N/A | N/A | \??\c:\program files (x86)\internet explorer\iexplore.exe | N/A |
Suspicious use of WriteProcessMemory
Processes
C:\Users\Admin\AppData\Local\Temp\Updater.exe
"C:\Users\Admin\AppData\Local\Temp\Updater.exe"
C:\Windows\SysWOW64\cmd.exe
/k %windir%\System32\reg.exe ADD HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System /v EnableLUA /t REG_DWORD /d 0 /f
C:\Windows\SysWOW64\reg.exe
C:\Windows\System32\reg.exe ADD HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System /v EnableLUA /t REG_DWORD /d 0 /f
\??\c:\program files (x86)\internet explorer\iexplore.exe
"c:\program files (x86)\internet explorer\iexplore.exe"
C:\Windows\SysWOW64\cmd.exe
/k %windir%\System32\reg.exe ADD HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System /v EnableLUA /t REG_DWORD /d 0 /f
C:\Windows\SysWOW64\svchost.exe
svchost.exe
C:\Windows\SysWOW64\reg.exe
C:\Windows\System32\reg.exe ADD HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System /v EnableLUA /t REG_DWORD /d 0 /f
C:\Windows\System32\rundll32.exe
C:\Windows\System32\rundll32.exe C:\Windows\System32\shell32.dll,SHCreateLocalServerRunDll {9aa46009-3ce0-458a-a354-715610a075e6} -Embedding
C:\Users\Admin\Downloads\NecroObfuscator\NecroObfuscator\NecroObfuscator.exe
"C:\Users\Admin\Downloads\NecroObfuscator\NecroObfuscator\NecroObfuscator.exe"
Network
| Country | Destination | Domain | Proto |
| US | 8.8.8.8:53 | mode-clusters.gl.at.ply.gg | udp |
| US | 147.185.221.21:36304 | mode-clusters.gl.at.ply.gg | tcp |
| US | 8.8.8.8:53 | 104.219.191.52.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 21.221.185.147.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 73.144.22.2.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 2.159.190.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | geoplugin.net | udp |
| NL | 178.237.33.50:80 | geoplugin.net | tcp |
| NL | 178.237.33.50:80 | geoplugin.net | tcp |
| US | 8.8.8.8:53 | 95.221.229.192.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 50.33.237.178.in-addr.arpa | udp |
| US | 147.185.221.21:36304 | mode-clusters.gl.at.ply.gg | tcp |
| US | 147.185.221.21:36304 | mode-clusters.gl.at.ply.gg | tcp |
| US | 8.8.8.8:53 | 196.249.167.52.in-addr.arpa | udp |
| US | 147.185.221.21:36304 | mode-clusters.gl.at.ply.gg | tcp |
| US | 147.185.221.21:36304 | mode-clusters.gl.at.ply.gg | tcp |
| US | 8.8.8.8:53 | 26.165.165.52.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 56.126.166.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 0.205.248.87.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 81.144.22.2.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 26.35.223.20.in-addr.arpa | udp |
Files
C:\Windows\SysWOW64\Remcos\$77-Installer
| MD5 | 2e2946dbb102329c2b7ea3a6bc6d928e |
| SHA1 | f71e23604985c52f609a8eaa1f907b6cf1311bbe |
| SHA256 | 4311ee23e9f4cb3432d3b0a5a78b020f89494063ba1d870298f2117970879e37 |
| SHA512 | 60ab3f9a07d86dcdf37e2823d2f140f28dcd2b6120821703db1eadd2ed8ab34aea6abeb5cc6e54426374f6e780a2d9014dbd1a9d353cbb1d6ccd077e58ce57da |
memory/2660-15-0x00000000008F0000-0x0000000000972000-memory.dmp
memory/2660-17-0x00000000008F0000-0x0000000000972000-memory.dmp
memory/3876-25-0x0000000000460000-0x00000000004E2000-memory.dmp
memory/2660-27-0x00000000008F0000-0x0000000000972000-memory.dmp
memory/3876-26-0x0000000000460000-0x00000000004E2000-memory.dmp
memory/3876-24-0x0000000000460000-0x00000000004E2000-memory.dmp
memory/3876-23-0x0000000000460000-0x00000000004E2000-memory.dmp
memory/2660-19-0x00000000008F0000-0x0000000000972000-memory.dmp
memory/2660-18-0x00000000008F0000-0x0000000000972000-memory.dmp
memory/2660-16-0x00000000008F0000-0x0000000000972000-memory.dmp
memory/2660-29-0x00000000008F0000-0x0000000000972000-memory.dmp
memory/2660-28-0x00000000008F0000-0x0000000000972000-memory.dmp
memory/2660-30-0x00000000008F0000-0x0000000000972000-memory.dmp
memory/2660-33-0x00000000008F0000-0x0000000000972000-memory.dmp
memory/2660-34-0x00000000008F0000-0x0000000000972000-memory.dmp
memory/2660-35-0x00000000008F0000-0x0000000000972000-memory.dmp
memory/2660-36-0x00000000008F0000-0x0000000000972000-memory.dmp
memory/2660-37-0x00000000008F0000-0x0000000000972000-memory.dmp
memory/2660-38-0x00000000008F0000-0x0000000000972000-memory.dmp
memory/2660-40-0x00000000008F0000-0x0000000000972000-memory.dmp
memory/2660-41-0x00000000008F0000-0x0000000000972000-memory.dmp
memory/2660-42-0x00000000008F0000-0x0000000000972000-memory.dmp
memory/2660-43-0x00000000008F0000-0x0000000000972000-memory.dmp
memory/2660-44-0x00000000008F0000-0x0000000000972000-memory.dmp
memory/2660-45-0x00000000008F0000-0x0000000000972000-memory.dmp
memory/2660-46-0x00000000008F0000-0x0000000000972000-memory.dmp
memory/2660-47-0x00000000008F0000-0x0000000000972000-memory.dmp
memory/2660-48-0x00000000008F0000-0x0000000000972000-memory.dmp
memory/2660-49-0x00000000008F0000-0x0000000000972000-memory.dmp
memory/2660-52-0x00000000008F0000-0x0000000000972000-memory.dmp
memory/2660-53-0x00000000008F0000-0x0000000000972000-memory.dmp
memory/2660-54-0x00000000008F0000-0x0000000000972000-memory.dmp
memory/2660-55-0x00000000008F0000-0x0000000000972000-memory.dmp
memory/4480-56-0x0000000000E30000-0x0000000000EA8000-memory.dmp
memory/4480-57-0x0000000005E10000-0x00000000063B4000-memory.dmp
memory/4480-58-0x00000000056E0000-0x000000000570C000-memory.dmp
memory/4480-59-0x0000000005B80000-0x0000000005C12000-memory.dmp
memory/4480-60-0x0000000005B70000-0x0000000005B7A000-memory.dmp
memory/2660-61-0x00000000008F0000-0x0000000000972000-memory.dmp
memory/2660-62-0x00000000008F0000-0x0000000000972000-memory.dmp