Analysis Overview
SHA256
c1a4f8840c7d3c16fa5bb0b52507a501da19dff827fff7b64778f24726d8d5c9
Threat Level: Known bad
The file c1a4f8840c7d3c16fa5bb0b52507a501da19dff827fff7b64778f24726d8d5c9 was found to be: Known bad.
Malicious Activity Summary
Kutaki
Kutaki family
Kutaki Executable
Executes dropped EXE
Sets service image path in registry
Checks computer location settings
Loads dropped DLL
Drops startup file
Drops file in Windows directory
Enumerates physical storage devices
Suspicious use of WriteProcessMemory
Suspicious use of FindShellTrayWindow
Modifies registry class
Suspicious behavior: EnumeratesProcesses
Suspicious use of SetWindowsHookEx
Modifies data under HKEY_USERS
MITRE ATT&CK
Enterprise Matrix V6
Analysis: static1
Detonation Overview
Reported
2022-02-01 02:19
Signatures
Kutaki Executable
| Description | Indicator | Process | Target |
| N/A | N/A | N/A | N/A |
Kutaki family
Analysis: behavioral1
Detonation Overview
Submitted
2022-02-01 02:19
Reported
2022-02-01 02:22
Platform
win7-en-20211208
Max time kernel
137s
Max time network
119s
Command Line
Signatures
Kutaki
Kutaki Executable
| Description | Indicator | Process | Target |
| N/A | N/A | N/A | N/A |
| N/A | N/A | N/A | N/A |
| N/A | N/A | N/A | N/A |
Executes dropped EXE
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\tkmsbrch.exe | N/A |
Drops startup file
| Description | Indicator | Process | Target |
| File created | C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\tkmsbrch.exe | C:\Users\Admin\AppData\Local\Temp\c1a4f8840c7d3c16fa5bb0b52507a501da19dff827fff7b64778f24726d8d5c9.exe | N/A |
| File opened for modification | C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\tkmsbrch.exe | C:\Users\Admin\AppData\Local\Temp\c1a4f8840c7d3c16fa5bb0b52507a501da19dff827fff7b64778f24726d8d5c9.exe | N/A |
Loads dropped DLL
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Users\Admin\AppData\Local\Temp\c1a4f8840c7d3c16fa5bb0b52507a501da19dff827fff7b64778f24726d8d5c9.exe | N/A |
| N/A | N/A | C:\Users\Admin\AppData\Local\Temp\c1a4f8840c7d3c16fa5bb0b52507a501da19dff827fff7b64778f24726d8d5c9.exe | N/A |
Enumerates physical storage devices
Suspicious use of FindShellTrayWindow
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windows\SysWOW64\DllHost.exe | N/A |
Suspicious use of SetWindowsHookEx
Suspicious use of WriteProcessMemory
Processes
C:\Users\Admin\AppData\Local\Temp\c1a4f8840c7d3c16fa5bb0b52507a501da19dff827fff7b64778f24726d8d5c9.exe
"C:\Users\Admin\AppData\Local\Temp\c1a4f8840c7d3c16fa5bb0b52507a501da19dff827fff7b64778f24726d8d5c9.exe"
C:\Windows\SysWOW64\cmd.exe
cmd.exe /c C:\Users\Admin\AppData\Local\Temp\NewBitmapImage.bmp
C:\Windows\SysWOW64\DllHost.exe
C:\Windows\SysWOW64\DllHost.exe /Processid:{76D0CB12-7604-4048-B83C-1005C7DDC503}
C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\tkmsbrch.exe
"C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\tkmsbrch.exe"
Network
Files
memory/1092-56-0x0000000076121000-0x0000000076123000-memory.dmp
memory/708-59-0x00000000003D0000-0x00000000003D2000-memory.dmp
memory/1484-60-0x00000000001A0000-0x00000000001A2000-memory.dmp
memory/1484-61-0x0000000000500000-0x0000000000501000-memory.dmp
\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\tkmsbrch.exe
| MD5 | 7179c01d287ea46e21056c636762968e |
| SHA1 | a415e62ffb1aa36634d5829e4860440f98623358 |
| SHA256 | c1a4f8840c7d3c16fa5bb0b52507a501da19dff827fff7b64778f24726d8d5c9 |
| SHA512 | 875034e75889847861f603afada2ea5a7ebc1058e84dea5759dd8528055ad48cfd2b64bca3109721ccc2a16f171b8368649603955d69583380ec1400e5b34dfc |
\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\tkmsbrch.exe
| MD5 | 7179c01d287ea46e21056c636762968e |
| SHA1 | a415e62ffb1aa36634d5829e4860440f98623358 |
| SHA256 | c1a4f8840c7d3c16fa5bb0b52507a501da19dff827fff7b64778f24726d8d5c9 |
| SHA512 | 875034e75889847861f603afada2ea5a7ebc1058e84dea5759dd8528055ad48cfd2b64bca3109721ccc2a16f171b8368649603955d69583380ec1400e5b34dfc |
C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\tkmsbrch.exe
| MD5 | 7179c01d287ea46e21056c636762968e |
| SHA1 | a415e62ffb1aa36634d5829e4860440f98623358 |
| SHA256 | c1a4f8840c7d3c16fa5bb0b52507a501da19dff827fff7b64778f24726d8d5c9 |
| SHA512 | 875034e75889847861f603afada2ea5a7ebc1058e84dea5759dd8528055ad48cfd2b64bca3109721ccc2a16f171b8368649603955d69583380ec1400e5b34dfc |
Analysis: behavioral2
Detonation Overview
Submitted
2022-02-01 02:19
Reported
2022-02-01 02:22
Platform
win10v2004-en-20220112
Max time kernel
142s
Max time network
170s
Command Line
Signatures
Kutaki
Kutaki Executable
| Description | Indicator | Process | Target |
| N/A | N/A | N/A | N/A |
| N/A | N/A | N/A | N/A |
Executes dropped EXE
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\avffqdch.exe | N/A |
Sets service image path in registry
Checks computer location settings
| Description | Indicator | Process | Target |
| Key value queried | \REGISTRY\USER\S-1-5-21-790714498-1549421491-1643397139-1000\Control Panel\International\Geo\Nation | C:\Windows\SysWOW64\cmd.exe | N/A |
Drops startup file
| Description | Indicator | Process | Target |
| File created | C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\avffqdch.exe | C:\Users\Admin\AppData\Local\Temp\c1a4f8840c7d3c16fa5bb0b52507a501da19dff827fff7b64778f24726d8d5c9.exe | N/A |
| File opened for modification | C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\avffqdch.exe | C:\Users\Admin\AppData\Local\Temp\c1a4f8840c7d3c16fa5bb0b52507a501da19dff827fff7b64778f24726d8d5c9.exe | N/A |
Drops file in Windows directory
| Description | Indicator | Process | Target |
| File opened for modification | C:\Windows\Debug\WIA\wiatrace.log | C:\Windows\SysWOW64\mspaint.exe | N/A |
Enumerates physical storage devices
Modifies data under HKEY_USERS
| Description | Indicator | Process | Target |
| Key created | \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\SmartCardRoot\CRLs | C:\Windows\System32\WaaSMedicAgent.exe | N/A |
| Key created | \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\SmartCardRoot\CTLs | C:\Windows\System32\WaaSMedicAgent.exe | N/A |
| Key created | \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\SmartCardRoot\Certificates | C:\Windows\System32\WaaSMedicAgent.exe | N/A |
| Key created | \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\Disallowed\CTLs | C:\Windows\System32\WaaSMedicAgent.exe | N/A |
| Key created | \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\TrustedPeople | C:\Windows\System32\WaaSMedicAgent.exe | N/A |
| Key created | \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\Disallowed\Certificates | C:\Windows\System32\WaaSMedicAgent.exe | N/A |
| Key created | \REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\CA\Certificates | C:\Windows\System32\WaaSMedicAgent.exe | N/A |
| Key created | \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\Disallowed | C:\Windows\System32\WaaSMedicAgent.exe | N/A |
| Key created | \REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\Disallowed\Certificates | C:\Windows\System32\WaaSMedicAgent.exe | N/A |
| Key created | \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\Root\CTLs | C:\Windows\System32\WaaSMedicAgent.exe | N/A |
| Key created | \REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\trust\CTLs | C:\Windows\System32\WaaSMedicAgent.exe | N/A |
| Key created | \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\CA\Certificates | C:\Windows\System32\WaaSMedicAgent.exe | N/A |
| Key created | \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\Root | C:\Windows\System32\WaaSMedicAgent.exe | N/A |
| Key created | \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\TrustedPeople\CRLs | C:\Windows\System32\WaaSMedicAgent.exe | N/A |
| Key created | \REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\trust | C:\Windows\System32\WaaSMedicAgent.exe | N/A |
| Key created | \REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\trust\CRLs | C:\Windows\System32\WaaSMedicAgent.exe | N/A |
| Key created | \REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\CA\CRLs | C:\Windows\System32\WaaSMedicAgent.exe | N/A |
| Key created | \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\CA | C:\Windows\System32\WaaSMedicAgent.exe | N/A |
| Key created | \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\CA\CTLs | C:\Windows\System32\WaaSMedicAgent.exe | N/A |
| Key created | \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\SmartCardRoot | C:\Windows\System32\WaaSMedicAgent.exe | N/A |
| Key created | \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\TrustedPeople\CTLs | C:\Windows\System32\WaaSMedicAgent.exe | N/A |
| Key created | \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\trust\CRLs | C:\Windows\System32\WaaSMedicAgent.exe | N/A |
| Key created | \REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\trust\Certificates | C:\Windows\System32\WaaSMedicAgent.exe | N/A |
| Key created | \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\WinTrust\Trust Providers\Software Publishing | C:\Windows\System32\WaaSMedicAgent.exe | N/A |
| Key created | \REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\Disallowed | C:\Windows\System32\WaaSMedicAgent.exe | N/A |
| Key created | \REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\Disallowed\CTLs | C:\Windows\System32\WaaSMedicAgent.exe | N/A |
| Key created | \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\Root\Certificates | C:\Windows\System32\WaaSMedicAgent.exe | N/A |
| Key created | \REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\TrustedPeople\CRLs | C:\Windows\System32\WaaSMedicAgent.exe | N/A |
| Key created | \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\trust\Certificates | C:\Windows\System32\WaaSMedicAgent.exe | N/A |
| Key created | \REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\CA\CTLs | C:\Windows\System32\WaaSMedicAgent.exe | N/A |
| Key created | \REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\TrustedPeople | C:\Windows\System32\WaaSMedicAgent.exe | N/A |
| Key created | \REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\TrustedPeople\Certificates | C:\Windows\System32\WaaSMedicAgent.exe | N/A |
| Key created | \REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\TrustedPeople\CTLs | C:\Windows\System32\WaaSMedicAgent.exe | N/A |
| Key created | \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\trust | C:\Windows\System32\WaaSMedicAgent.exe | N/A |
| Key created | \REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\CA | C:\Windows\System32\WaaSMedicAgent.exe | N/A |
| Key created | \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\Disallowed\CRLs | C:\Windows\System32\WaaSMedicAgent.exe | N/A |
| Key created | \REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\Disallowed\CRLs | C:\Windows\System32\WaaSMedicAgent.exe | N/A |
| Key created | \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\Root\CRLs | C:\Windows\System32\WaaSMedicAgent.exe | N/A |
| Key created | \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\TrustedPeople\Certificates | C:\Windows\System32\WaaSMedicAgent.exe | N/A |
| Key created | \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\trust\CTLs | C:\Windows\System32\WaaSMedicAgent.exe | N/A |
| Key created | \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\CA\CRLs | C:\Windows\System32\WaaSMedicAgent.exe | N/A |
Modifies registry class
| Description | Indicator | Process | Target |
| Key created | \REGISTRY\USER\S-1-5-21-790714498-1549421491-1643397139-1000_Classes\Local Settings | C:\Windows\SysWOW64\cmd.exe | N/A |
Suspicious behavior: EnumeratesProcesses
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windows\SysWOW64\mspaint.exe | N/A |
| N/A | N/A | C:\Windows\SysWOW64\mspaint.exe | N/A |
Suspicious use of SetWindowsHookEx
Suspicious use of WriteProcessMemory
Processes
C:\Users\Admin\AppData\Local\Temp\c1a4f8840c7d3c16fa5bb0b52507a501da19dff827fff7b64778f24726d8d5c9.exe
"C:\Users\Admin\AppData\Local\Temp\c1a4f8840c7d3c16fa5bb0b52507a501da19dff827fff7b64778f24726d8d5c9.exe"
C:\Windows\SysWOW64\cmd.exe
cmd.exe /c C:\Users\Admin\AppData\Local\Temp\NewBitmapImage.bmp
C:\Windows\SysWOW64\mspaint.exe
"C:\Windows\system32\mspaint.exe" "C:\Users\Admin\AppData\Local\Temp\NewBitmapImage.bmp"
C:\Windows\System32\WaaSMedicAgent.exe
C:\Windows\System32\WaaSMedicAgent.exe f7d67dc6c46a842ea90747b9424e3464 BGQEXfaXXUSNy+AvXw5Ntg.0.1.0.0.0
C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\avffqdch.exe
"C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\avffqdch.exe"
Network
| Country | Destination | Domain | Proto |
| NL | 20.190.160.73:443 | tcp | |
| NL | 20.190.160.73:443 | tcp | |
| NL | 20.190.160.73:443 | tcp | |
| US | 93.184.220.29:80 | tcp | |
| US | 8.8.8.8:53 | settings-win.data.microsoft.com | udp |
| US | 52.167.17.97:443 | settings-win.data.microsoft.com | tcp |
| US | 52.167.17.97:443 | settings-win.data.microsoft.com | tcp |
| FR | 2.18.105.186:80 | go.microsoft.com | tcp |
| US | 8.8.8.8:53 | dmd.metaservices.microsoft.com | udp |
| US | 52.188.50.245:80 | dmd.metaservices.microsoft.com | tcp |
| US | 8.8.8.8:53 | crl3.digicert.com | udp |
| US | 72.21.91.29:80 | crl3.digicert.com | tcp |
| US | 209.197.3.8:80 | tcp | |
| US | 209.197.3.8:80 | tcp | |
| US | 52.167.17.97:443 | settings-win.data.microsoft.com | tcp |
| US | 52.167.17.97:443 | settings-win.data.microsoft.com | tcp |
| US | 52.167.17.97:443 | settings-win.data.microsoft.com | tcp |
Files
C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\avffqdch.exe
| MD5 | 7179c01d287ea46e21056c636762968e |
| SHA1 | a415e62ffb1aa36634d5829e4860440f98623358 |
| SHA256 | c1a4f8840c7d3c16fa5bb0b52507a501da19dff827fff7b64778f24726d8d5c9 |
| SHA512 | 875034e75889847861f603afada2ea5a7ebc1058e84dea5759dd8528055ad48cfd2b64bca3109721ccc2a16f171b8368649603955d69583380ec1400e5b34dfc |
C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\avffqdch.exe
| MD5 | 7179c01d287ea46e21056c636762968e |
| SHA1 | a415e62ffb1aa36634d5829e4860440f98623358 |
| SHA256 | c1a4f8840c7d3c16fa5bb0b52507a501da19dff827fff7b64778f24726d8d5c9 |
| SHA512 | 875034e75889847861f603afada2ea5a7ebc1058e84dea5759dd8528055ad48cfd2b64bca3109721ccc2a16f171b8368649603955d69583380ec1400e5b34dfc |