Analysis Overview
SHA256
a400494e331bad7b692500e84505d5c675f490d025be0546d020c249f0236a6c
Threat Level: Known bad
The file a400494e331bad7b692500e84505d5c675f490d025be0546d020c249f0236a6c was found to be: Known bad.
Malicious Activity Summary
Process spawned unexpected child process
Suspicious Office macro
System Location Discovery: System Language Discovery
Enumerates system info in registry
Suspicious use of SetWindowsHookEx
Checks processor information in registry
Suspicious use of FindShellTrayWindow
Suspicious behavior: AddClipboardFormatListener
Suspicious use of WriteProcessMemory
MITRE ATT&CK
Enterprise Matrix V15
Analysis: static1
Detonation Overview
Reported
2024-11-11 20:29
Signatures
Suspicious Office macro
| Description | Indicator | Process | Target |
| N/A | N/A | N/A | N/A |
Analysis: behavioral1
Detonation Overview
Submitted
2024-11-11 20:29
Reported
2024-11-11 20:31
Platform
win7-20241010-en
Max time kernel
120s
Max time network
121s
Command Line
Signatures
Process spawned unexpected child process
| Description | Indicator | Process | Target |
| Parent C:\Program Files (x86)\Microsoft Office\Office14\EXCEL.EXE is not expected to spawn this process | N/A | C:\Windows\SysWow64\regsvr32.exe | C:\Program Files (x86)\Microsoft Office\Office14\EXCEL.EXE |
System Location Discovery: System Language Discovery
| Description | Indicator | Process | Target |
| Key opened | \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language | C:\Program Files (x86)\Microsoft Office\Office14\EXCEL.EXE | N/A |
| Key opened | \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language | C:\Windows\SysWow64\regsvr32.exe | N/A |
Enumerates system info in registry
| Description | Indicator | Process | Target |
| Key opened | \REGISTRY\MACHINE\Hardware\Description\System\FloatingPointProcessor | C:\Program Files (x86)\Microsoft Office\Office14\EXCEL.EXE | N/A |
Suspicious behavior: AddClipboardFormatListener
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Program Files (x86)\Microsoft Office\Office14\EXCEL.EXE | N/A |
Suspicious use of SetWindowsHookEx
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Program Files (x86)\Microsoft Office\Office14\EXCEL.EXE | N/A |
| N/A | N/A | C:\Program Files (x86)\Microsoft Office\Office14\EXCEL.EXE | N/A |
| N/A | N/A | C:\Program Files (x86)\Microsoft Office\Office14\EXCEL.EXE | N/A |
Suspicious use of WriteProcessMemory
| Description | Indicator | Process | Target |
| PID 1192 wrote to memory of 2756 | N/A | C:\Program Files (x86)\Microsoft Office\Office14\EXCEL.EXE | C:\Windows\SysWow64\regsvr32.exe |
| PID 1192 wrote to memory of 2756 | N/A | C:\Program Files (x86)\Microsoft Office\Office14\EXCEL.EXE | C:\Windows\SysWow64\regsvr32.exe |
| PID 1192 wrote to memory of 2756 | N/A | C:\Program Files (x86)\Microsoft Office\Office14\EXCEL.EXE | C:\Windows\SysWow64\regsvr32.exe |
| PID 1192 wrote to memory of 2756 | N/A | C:\Program Files (x86)\Microsoft Office\Office14\EXCEL.EXE | C:\Windows\SysWow64\regsvr32.exe |
| PID 1192 wrote to memory of 2756 | N/A | C:\Program Files (x86)\Microsoft Office\Office14\EXCEL.EXE | C:\Windows\SysWow64\regsvr32.exe |
| PID 1192 wrote to memory of 2756 | N/A | C:\Program Files (x86)\Microsoft Office\Office14\EXCEL.EXE | C:\Windows\SysWow64\regsvr32.exe |
| PID 1192 wrote to memory of 2756 | N/A | C:\Program Files (x86)\Microsoft Office\Office14\EXCEL.EXE | C:\Windows\SysWow64\regsvr32.exe |
Processes
C:\Program Files (x86)\Microsoft Office\Office14\EXCEL.EXE
"C:\Program Files (x86)\Microsoft Office\Office14\EXCEL.EXE" /dde C:\Users\Admin\AppData\Local\Temp\a400494e331bad7b692500e84505d5c675f490d025be0546d020c249f0236a6c.xlsm
C:\Windows\SysWow64\regsvr32.exe
C:\Windows\SysWow64\regsvr32.exe -s ..\rfs.dll
Network
| Country | Destination | Domain | Proto |
| US | 8.8.8.8:53 | beetle-j.jp | udp |
| JP | 219.100.169.159:80 | beetle-j.jp | tcp |
| US | 8.8.8.8:53 | brutobrasil.com.br | udp |
| US | 209.126.103.109:443 | brutobrasil.com.br | tcp |
| US | 209.126.103.109:443 | brutobrasil.com.br | tcp |
| US | 209.126.103.109:443 | brutobrasil.com.br | tcp |
| US | 209.126.103.109:443 | brutobrasil.com.br | tcp |
| US | 8.8.8.8:53 | e3technology.in | udp |
| US | 3.33.130.190:80 | e3technology.in | tcp |
Files
memory/1192-1-0x000000007263D000-0x0000000072648000-memory.dmp
memory/1192-0-0x000000005FFF0000-0x0000000060000000-memory.dmp
C:\Users\Admin\rfs.dll
| MD5 | e89f75f918dbdcee28604d4e09dd71d7 |
| SHA1 | f9d9055e9878723a12063b47d4a1a5f58c3eb1e9 |
| SHA256 | 6dc9c7fc93bb488bb0520a6c780a8d3c0fb5486a4711aca49b4c53fac7393023 |
| SHA512 | 8df0ab2e3679b64a6174deff4259ae5680f88e3ae307e0ea2dfff88ec4ba14f3477c9fe3a5aa5da3a8e857601170a5108ed75f6d6975958ac7a314e4a336aed0 |
memory/1192-7-0x000000007263D000-0x0000000072648000-memory.dmp
Analysis: behavioral2
Detonation Overview
Submitted
2024-11-11 20:29
Reported
2024-11-11 20:31
Platform
win10v2004-20241007-en
Max time kernel
133s
Max time network
137s
Command Line
Signatures
Process spawned unexpected child process
| Description | Indicator | Process | Target |
| Parent C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE is not expected to spawn this process | N/A | C:\Windows\SysWow64\regsvr32.exe | C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE |
System Location Discovery: System Language Discovery
| Description | Indicator | Process | Target |
| Key opened | \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language | C:\Windows\SysWow64\regsvr32.exe | N/A |
Checks processor information in registry
| Description | Indicator | Process | Target |
| Key value queried | \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\~MHz | C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE | N/A |
| Key value queried | \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString | C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE | N/A |
| Key opened | \REGISTRY\MACHINE\Hardware\Description\System\CentralProcessor\0 | C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE | N/A |
Enumerates system info in registry
| Description | Indicator | Process | Target |
| Key opened | \REGISTRY\MACHINE\Hardware\Description\System\BIOS | C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE | N/A |
| Key value queried | \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\BIOS\SystemFamily | C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE | N/A |
| Key value queried | \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\BIOS\SystemSKU | C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE | N/A |
Suspicious behavior: AddClipboardFormatListener
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE | N/A |
Suspicious use of FindShellTrayWindow
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE | N/A |
| N/A | N/A | C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE | N/A |
Suspicious use of SetWindowsHookEx
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE | N/A |
| N/A | N/A | C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE | N/A |
| N/A | N/A | C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE | N/A |
| N/A | N/A | C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE | N/A |
| N/A | N/A | C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE | N/A |
| N/A | N/A | C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE | N/A |
| N/A | N/A | C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE | N/A |
| N/A | N/A | C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE | N/A |
| N/A | N/A | C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE | N/A |
| N/A | N/A | C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE | N/A |
| N/A | N/A | C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE | N/A |
| N/A | N/A | C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE | N/A |
Suspicious use of WriteProcessMemory
| Description | Indicator | Process | Target |
| PID 3560 wrote to memory of 4592 | N/A | C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE | C:\Windows\SysWow64\regsvr32.exe |
| PID 3560 wrote to memory of 4592 | N/A | C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE | C:\Windows\SysWow64\regsvr32.exe |
| PID 3560 wrote to memory of 4592 | N/A | C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE | C:\Windows\SysWow64\regsvr32.exe |
Processes
C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE
"C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE" "C:\Users\Admin\AppData\Local\Temp\a400494e331bad7b692500e84505d5c675f490d025be0546d020c249f0236a6c.xlsm"
C:\Windows\SysWow64\regsvr32.exe
C:\Windows\SysWow64\regsvr32.exe -s ..\rfs.dll
Network
| Country | Destination | Domain | Proto |
| US | 8.8.8.8:53 | roaming.officeapps.live.com | udp |
| NL | 52.109.89.19:443 | roaming.officeapps.live.com | tcp |
| US | 8.8.8.8:53 | beetle-j.jp | udp |
| US | 8.8.8.8:53 | 8.8.8.8.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 18.89.109.52.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 97.17.167.52.in-addr.arpa | udp |
| JP | 219.100.169.159:80 | beetle-j.jp | tcp |
| US | 8.8.8.8:53 | 19.89.109.52.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 172.210.232.199.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 20.160.190.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 95.221.229.192.in-addr.arpa | udp |
| US | 8.8.8.8:53 | brutobrasil.com.br | udp |
| US | 209.126.103.109:443 | brutobrasil.com.br | tcp |
| US | 8.8.8.8:53 | 159.169.100.219.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 109.103.126.209.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 23.149.64.172.in-addr.arpa | udp |
| US | 8.8.8.8:53 | www.brutobrasil.com.br | udp |
| US | 209.126.103.109:443 | www.brutobrasil.com.br | tcp |
| US | 8.8.8.8:53 | e3technology.in | udp |
| US | 15.197.148.33:80 | e3technology.in | tcp |
| US | 8.8.8.8:53 | 33.148.197.15.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 8.179.89.13.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 58.55.71.13.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 200.163.202.172.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 15.164.165.52.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 172.214.232.199.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 11.227.111.52.in-addr.arpa | udp |
Files
memory/3560-1-0x00007FFF8A4B0000-0x00007FFF8A4C0000-memory.dmp
memory/3560-0-0x00007FFFCA4CD000-0x00007FFFCA4CE000-memory.dmp
memory/3560-4-0x00007FFF8A4B0000-0x00007FFF8A4C0000-memory.dmp
memory/3560-3-0x00007FFF8A4B0000-0x00007FFF8A4C0000-memory.dmp
memory/3560-5-0x00007FFF8A4B0000-0x00007FFF8A4C0000-memory.dmp
memory/3560-2-0x00007FFF8A4B0000-0x00007FFF8A4C0000-memory.dmp
memory/3560-9-0x00007FFFCA430000-0x00007FFFCA625000-memory.dmp
memory/3560-11-0x00007FFFCA430000-0x00007FFFCA625000-memory.dmp
memory/3560-15-0x00007FFFCA430000-0x00007FFFCA625000-memory.dmp
memory/3560-14-0x00007FFFCA430000-0x00007FFFCA625000-memory.dmp
memory/3560-16-0x00007FFF87DF0000-0x00007FFF87E00000-memory.dmp
memory/3560-13-0x00007FFFCA430000-0x00007FFFCA625000-memory.dmp
memory/3560-17-0x00007FFF87DF0000-0x00007FFF87E00000-memory.dmp
memory/3560-12-0x00007FFFCA430000-0x00007FFFCA625000-memory.dmp
memory/3560-19-0x00007FFFCA430000-0x00007FFFCA625000-memory.dmp
memory/3560-20-0x00007FFFCA430000-0x00007FFFCA625000-memory.dmp
memory/3560-18-0x00007FFFCA430000-0x00007FFFCA625000-memory.dmp
memory/3560-10-0x00007FFFCA430000-0x00007FFFCA625000-memory.dmp
memory/3560-8-0x00007FFFCA430000-0x00007FFFCA625000-memory.dmp
memory/3560-7-0x00007FFFCA430000-0x00007FFFCA625000-memory.dmp
memory/3560-6-0x00007FFFCA430000-0x00007FFFCA625000-memory.dmp
C:\Users\Admin\rfs.dll
| MD5 | e89f75f918dbdcee28604d4e09dd71d7 |
| SHA1 | f9d9055e9878723a12063b47d4a1a5f58c3eb1e9 |
| SHA256 | 6dc9c7fc93bb488bb0520a6c780a8d3c0fb5486a4711aca49b4c53fac7393023 |
| SHA512 | 8df0ab2e3679b64a6174deff4259ae5680f88e3ae307e0ea2dfff88ec4ba14f3477c9fe3a5aa5da3a8e857601170a5108ed75f6d6975958ac7a314e4a336aed0 |
memory/3560-43-0x00007FFFCA4CD000-0x00007FFFCA4CE000-memory.dmp
memory/3560-44-0x00007FFFCA430000-0x00007FFFCA625000-memory.dmp
memory/3560-45-0x00007FFFCA430000-0x00007FFFCA625000-memory.dmp
memory/3560-46-0x00007FFFCA430000-0x00007FFFCA625000-memory.dmp
C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Recent\CustomDestinations\b8ab77100df80ab2.customDestinations-ms
| MD5 | 98f6b43c2cf68c322d3a77b73c747a8a |
| SHA1 | 4d6b3d8e8baf2f09b87fff135dc13808733c6d2b |
| SHA256 | a5ebbdc558b8d9e9efb49dae6f3cb37df0493cbb82d9447ead6ea0cbfe8b0d1d |
| SHA512 | abd27876104975e9595e9c32a90effb3e246bdaa194fd556b8b24bc824a89f35193ba0eecebe9382c0a7c32608a90e0c6aa36f1c1e0eaf07bfdd51aad88d5a19 |