Analysis Overview
SHA256
8442a6a136ea46c9c5815736b4ba8a12e7976a21d75c229198d42b1c7213bfe4
Threat Level: Known bad
The file 8442a6a136ea46c9c5815736b4ba8a12e7976a21d75c229198d42b1c7213bfe4 was found to be: Known bad.
Malicious Activity Summary
Ryuk
Checks computer location settings
Adds Run key to start application
Drops desktop.ini file(s)
Drops file in Program Files directory
Enumerates physical storage devices
Suspicious behavior: EnumeratesProcesses
Suspicious use of AdjustPrivilegeToken
Suspicious use of WriteProcessMemory
MITRE ATT&CK
Enterprise Matrix V6
Analysis: static1
Detonation Overview
Reported
2022-02-20 05:06
Signatures
Analysis: behavioral1
Detonation Overview
Submitted
2022-02-20 05:06
Reported
2022-02-20 05:49
Platform
win7-en-20211208
Max time kernel
171s
Max time network
149s
Command Line
Signatures
Ryuk
Adds Run key to start application
| Description | Indicator | Process | Target |
| Set value (str) | \REGISTRY\USER\S-1-5-21-2329389628-4064185017-3901522362-1000\Software\Microsoft\Windows\CurrentVersion\Run\svchos = "C:\\Users\\Admin\\AppData\\Local\\Temp\\8442a6a136ea46c9c5815736b4ba8a12e7976a21d75c229198d42b1c7213bfe4.exe" | C:\Windows\SysWOW64\reg.exe | N/A |
| Key created | \REGISTRY\USER\S-1-5-21-2329389628-4064185017-3901522362-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run | C:\Windows\SysWOW64\reg.exe | N/A |
Drops desktop.ini file(s)
| Description | Indicator | Process | Target |
| File opened for modification | C:\Program Files\Common Files\Microsoft Shared\Stationery\Desktop.ini | C:\Users\Admin\AppData\Local\Temp\8442a6a136ea46c9c5815736b4ba8a12e7976a21d75c229198d42b1c7213bfe4.exe | N/A |
| File opened for modification | C:\Program Files\desktop.ini | C:\Users\Admin\AppData\Local\Temp\8442a6a136ea46c9c5815736b4ba8a12e7976a21d75c229198d42b1c7213bfe4.exe | N/A |
Drops file in Program Files directory
Enumerates physical storage devices
Suspicious behavior: EnumeratesProcesses
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Users\Admin\AppData\Local\Temp\8442a6a136ea46c9c5815736b4ba8a12e7976a21d75c229198d42b1c7213bfe4.exe | N/A |
Suspicious use of AdjustPrivilegeToken
| Description | Indicator | Process | Target |
| Token: SeDebugPrivilege | N/A | C:\Users\Admin\AppData\Local\Temp\8442a6a136ea46c9c5815736b4ba8a12e7976a21d75c229198d42b1c7213bfe4.exe | N/A |
Suspicious use of WriteProcessMemory
Processes
C:\Windows\system32\Dwm.exe
"C:\Windows\system32\Dwm.exe"
C:\Windows\system32\taskhost.exe
"taskhost.exe"
C:\Users\Admin\AppData\Local\Temp\8442a6a136ea46c9c5815736b4ba8a12e7976a21d75c229198d42b1c7213bfe4.exe
"C:\Users\Admin\AppData\Local\Temp\8442a6a136ea46c9c5815736b4ba8a12e7976a21d75c229198d42b1c7213bfe4.exe"
C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C REG ADD "HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Run" /v "svchos" /t REG_SZ /d "C:\Users\Admin\AppData\Local\Temp\8442a6a136ea46c9c5815736b4ba8a12e7976a21d75c229198d42b1c7213bfe4.exe" /f /reg:64
C:\Windows\system32\conhost.exe
\??\C:\Windows\system32\conhost.exe "454446870-2078751958176106590-8134576631384567631-18451716916430804871910280670"
C:\Windows\SysWOW64\reg.exe
REG ADD "HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Run" /v "svchos" /t REG_SZ /d "C:\Users\Admin\AppData\Local\Temp\8442a6a136ea46c9c5815736b4ba8a12e7976a21d75c229198d42b1c7213bfe4.exe" /f /reg:64
Network
Files
memory/1136-55-0x0000000076511000-0x0000000076513000-memory.dmp
memory/1208-56-0x0000000030000000-0x0000000030384000-memory.dmp
memory/792-60-0x0000000030000000-0x0000000030384000-memory.dmp
Analysis: behavioral2
Detonation Overview
Submitted
2022-02-20 05:06
Reported
2022-02-20 05:48
Platform
win10v2004-en-20220113
Max time kernel
177s
Max time network
222s
Command Line
Signatures
Checks computer location settings
| Description | Indicator | Process | Target |
| Key value queried | \REGISTRY\USER\S-1-5-21-1346565761-3498240568-4147300184-1000\Control Panel\International\Geo\Nation | C:\Users\Admin\AppData\Local\Temp\8442a6a136ea46c9c5815736b4ba8a12e7976a21d75c229198d42b1c7213bfe4.exe | N/A |
Adds Run key to start application
| Description | Indicator | Process | Target |
| Set value (str) | \REGISTRY\USER\S-1-5-21-1346565761-3498240568-4147300184-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\svchos = "C:\\Users\\Admin\\AppData\\Local\\Temp\\8442a6a136ea46c9c5815736b4ba8a12e7976a21d75c229198d42b1c7213bfe4.exe" | C:\Windows\SysWOW64\reg.exe | N/A |
| Key created | \REGISTRY\USER\S-1-5-21-1346565761-3498240568-4147300184-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run | C:\Windows\SysWOW64\reg.exe | N/A |
Enumerates physical storage devices
Suspicious behavior: EnumeratesProcesses
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Users\Admin\AppData\Local\Temp\8442a6a136ea46c9c5815736b4ba8a12e7976a21d75c229198d42b1c7213bfe4.exe | N/A |
| N/A | N/A | C:\Users\Admin\AppData\Local\Temp\8442a6a136ea46c9c5815736b4ba8a12e7976a21d75c229198d42b1c7213bfe4.exe | N/A |
Suspicious use of AdjustPrivilegeToken
| Description | Indicator | Process | Target |
| Token: SeDebugPrivilege | N/A | C:\Users\Admin\AppData\Local\Temp\8442a6a136ea46c9c5815736b4ba8a12e7976a21d75c229198d42b1c7213bfe4.exe | N/A |
Suspicious use of WriteProcessMemory
Processes
C:\Windows\System32\RuntimeBroker.exe
C:\Windows\System32\RuntimeBroker.exe -Embedding
C:\Windows\SystemApps\Microsoft.Windows.StartMenuExperienceHost_cw5n1h2txyewy\StartMenuExperienceHost.exe
"C:\Windows\SystemApps\Microsoft.Windows.StartMenuExperienceHost_cw5n1h2txyewy\StartMenuExperienceHost.exe" -ServerName:App.AppXywbrabmsek0gm3tkwpr5kwzbs55tkqay.mca
C:\Windows\system32\DllHost.exe
C:\Windows\system32\DllHost.exe /Processid:{3EB3C877-1F16-487C-9050-104DBCD66683}
C:\Windows\system32\svchost.exe
C:\Windows\system32\svchost.exe -k ClipboardSvcGroup -p -s cbdhsvc
C:\Windows\system32\taskhostw.exe
taskhostw.exe {222A245B-E637-4AE9-A93F-A59CA119A75E}
C:\Windows\system32\svchost.exe
C:\Windows\system32\svchost.exe -k UnistackSvcGroup -s CDPUserSvc
C:\Windows\system32\sihost.exe
sihost.exe
C:\Windows\System32\RuntimeBroker.exe
C:\Windows\System32\RuntimeBroker.exe -Embedding
C:\Windows\system32\backgroundTaskHost.exe
"C:\Windows\system32\backgroundTaskHost.exe" -ServerName:App.AppXmtcan0h2tfbfy7k9kn8hbxb6dmzz1zh0.mca
C:\Windows\System32\RuntimeBroker.exe
C:\Windows\System32\RuntimeBroker.exe -Embedding
C:\Windows\System32\RuntimeBroker.exe
C:\Windows\System32\RuntimeBroker.exe -Embedding
C:\Windows\SystemApps\Microsoft.Windows.Search_cw5n1h2txyewy\SearchApp.exe
"C:\Windows\SystemApps\Microsoft.Windows.Search_cw5n1h2txyewy\SearchApp.exe" -ServerName:CortanaUI.AppX8z9r6jm96hw4bsbneegw0kyxx296wr9t.mca
C:\Users\Admin\AppData\Local\Temp\8442a6a136ea46c9c5815736b4ba8a12e7976a21d75c229198d42b1c7213bfe4.exe
"C:\Users\Admin\AppData\Local\Temp\8442a6a136ea46c9c5815736b4ba8a12e7976a21d75c229198d42b1c7213bfe4.exe"
C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C REG ADD "HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Run" /v "svchos" /t REG_SZ /d "C:\Users\Admin\AppData\Local\Temp\8442a6a136ea46c9c5815736b4ba8a12e7976a21d75c229198d42b1c7213bfe4.exe" /f /reg:64
C:\Windows\SysWOW64\reg.exe
REG ADD "HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Run" /v "svchos" /t REG_SZ /d "C:\Users\Admin\AppData\Local\Temp\8442a6a136ea46c9c5815736b4ba8a12e7976a21d75c229198d42b1c7213bfe4.exe" /f /reg:64
Network
| Country | Destination | Domain | Proto |
| US | 93.184.220.29:80 | tcp | |
| US | 93.184.220.29:80 | tcp | |
| US | 93.184.220.29:80 | tcp | |
| US | 72.21.81.240:80 | tcp | |
| US | 72.21.81.240:80 | tcp | |
| US | 168.62.240.75:443 | tcp | |
| US | 204.79.197.200:443 | tcp |