Analysis Overview
SHA256
a90285e58fd49c1ae1cbf50f7f37438b12aa08b61e52a1f612e6cf9863d18672
Threat Level: Known bad
The file a90285e58fd49c1ae1cbf50f7f37438b12aa08b61e52a1f612e6cf9863d18672 was found to be: Known bad.
Malicious Activity Summary
Ryuk
Enumerates physical storage devices
Runs net.exe
Suspicious behavior: EnumeratesProcesses
Suspicious use of AdjustPrivilegeToken
Suspicious use of WriteProcessMemory
Checks processor information in registry
Modifies data under HKEY_USERS
MITRE ATT&CK
Enterprise Matrix V6
Analysis: static1
Detonation Overview
Reported
2022-02-20 03:32
Signatures
Analysis: behavioral1
Detonation Overview
Submitted
2022-02-20 03:32
Reported
2022-02-20 03:49
Platform
win7-en-20211208
Max time kernel
170s
Max time network
144s
Command Line
Signatures
Ryuk
Enumerates physical storage devices
Runs net.exe
Suspicious behavior: EnumeratesProcesses
Suspicious use of AdjustPrivilegeToken
| Description | Indicator | Process | Target |
| Token: SeBackupPrivilege | N/A | C:\Users\Admin\AppData\Local\Temp\a90285e58fd49c1ae1cbf50f7f37438b12aa08b61e52a1f612e6cf9863d18672.exe | N/A |
Suspicious use of WriteProcessMemory
Processes
C:\Users\Admin\AppData\Local\Temp\a90285e58fd49c1ae1cbf50f7f37438b12aa08b61e52a1f612e6cf9863d18672.exe
"C:\Users\Admin\AppData\Local\Temp\a90285e58fd49c1ae1cbf50f7f37438b12aa08b61e52a1f612e6cf9863d18672.exe"
C:\Windows\SysWOW64\net.exe
"C:\Windows\System32\net.exe" stop "audioendpointbuilder" /y
C:\Windows\SysWOW64\net.exe
"C:\Windows\System32\net.exe" stop "samss" /y
C:\Windows\SysWOW64\net1.exe
C:\Windows\system32\net1 stop "audioendpointbuilder" /y
C:\Windows\SysWOW64\net1.exe
C:\Windows\system32\net1 stop "samss" /y
C:\Windows\SysWOW64\net.exe
"C:\Windows\System32\net.exe" stop "samss" /y
C:\Windows\SysWOW64\net1.exe
C:\Windows\system32\net1 stop "samss" /y
C:\Windows\SysWOW64\net.exe
"C:\Windows\System32\net.exe" stop "samss" /y
C:\Windows\SysWOW64\net1.exe
C:\Windows\system32\net1 stop "samss" /y
Network
Files
memory/1472-55-0x0000000075F81000-0x0000000075F83000-memory.dmp
Analysis: behavioral2
Detonation Overview
Submitted
2022-02-20 03:32
Reported
2022-02-20 03:49
Platform
win10v2004-en-20220112
Max time kernel
180s
Max time network
198s
Command Line
Signatures
Ryuk
Checks processor information in registry
| Description | Indicator | Process | Target |
| Key opened | \Registry\Machine\HARDWARE\DESCRIPTION\System\CentralProcessor\0 | C:\Windows\system32\MusNotifyIcon.exe | N/A |
| Key value queried | \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\~MHz | C:\Windows\system32\MusNotifyIcon.exe | N/A |
Modifies data under HKEY_USERS
| Description | Indicator | Process | Target |
| Key created | \REGISTRY\USER\S-1-5-20\SOFTWARE\Microsoft\Windows\CurrentVersion\DeliveryOptimization | C:\Windows\System32\svchost.exe | N/A |
Suspicious behavior: EnumeratesProcesses
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Users\Admin\AppData\Local\Temp\a90285e58fd49c1ae1cbf50f7f37438b12aa08b61e52a1f612e6cf9863d18672.exe | N/A |
| N/A | N/A | C:\Users\Admin\AppData\Local\Temp\a90285e58fd49c1ae1cbf50f7f37438b12aa08b61e52a1f612e6cf9863d18672.exe | N/A |
Suspicious use of AdjustPrivilegeToken
| Description | Indicator | Process | Target |
| Token: SeBackupPrivilege | N/A | C:\Users\Admin\AppData\Local\Temp\a90285e58fd49c1ae1cbf50f7f37438b12aa08b61e52a1f612e6cf9863d18672.exe | N/A |
Processes
C:\Users\Admin\AppData\Local\Temp\a90285e58fd49c1ae1cbf50f7f37438b12aa08b61e52a1f612e6cf9863d18672.exe
"C:\Users\Admin\AppData\Local\Temp\a90285e58fd49c1ae1cbf50f7f37438b12aa08b61e52a1f612e6cf9863d18672.exe"
C:\Windows\system32\MusNotifyIcon.exe
%systemroot%\system32\MusNotifyIcon.exe NotifyTrayIcon 13
C:\Windows\System32\svchost.exe
C:\Windows\System32\svchost.exe -k NetworkService -p
Network
| Country | Destination | Domain | Proto |
| US | 209.197.3.8:80 | tcp | |
| US | 209.197.3.8:80 | tcp | |
| US | 209.197.3.8:80 | tcp | |
| US | 209.197.3.8:80 | tcp | |
| US | 8.8.8.8:53 | 106.89.54.20.in-addr.arpa | udp |