Analysis Overview
SHA256
597a26bc8399acff834bbce2ccbe7d5bab0e190e7f9163c2bce5feacc7f77ee9
Threat Level: Known bad
The file Client-built.exe was found to be: Known bad.
Malicious Activity Summary
Quasar payload
Quasar RAT
Quasar family
Executes dropped EXE
Unsigned PE
Enumerates physical storage devices
Suspicious use of SendNotifyMessage
Suspicious use of FindShellTrayWindow
Scheduled Task/Job: Scheduled Task
Suspicious use of AdjustPrivilegeToken
Uses Task Scheduler COM API
Suspicious use of WriteProcessMemory
MITRE ATT&CK
Enterprise Matrix V15
Analysis: static1
Detonation Overview
Reported
2024-11-03 07:12
Signatures
Quasar family
Quasar payload
| Description | Indicator | Process | Target |
| N/A | N/A | N/A | N/A |
Unsigned PE
| Description | Indicator | Process | Target |
| N/A | N/A | N/A | N/A |
Analysis: behavioral1
Detonation Overview
Submitted
2024-11-03 07:12
Reported
2024-11-03 07:15
Platform
win10v2004-20241007-en
Max time kernel
137s
Max time network
146s
Command Line
Signatures
Quasar RAT
Quasar family
Quasar payload
| 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\SubDir\Client.exe | N/A |
Enumerates physical storage devices
Scheduled Task/Job: Scheduled Task
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windows\SYSTEM32\schtasks.exe | N/A |
| N/A | N/A | C:\Windows\SYSTEM32\schtasks.exe | N/A |
Suspicious use of AdjustPrivilegeToken
| Description | Indicator | Process | Target |
| Token: SeDebugPrivilege | N/A | C:\Users\Admin\AppData\Local\Temp\Client-built.exe | N/A |
| Token: SeDebugPrivilege | N/A | C:\Users\Admin\AppData\Roaming\SubDir\Client.exe | N/A |
Suspicious use of FindShellTrayWindow
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Users\Admin\AppData\Roaming\SubDir\Client.exe | N/A |
Suspicious use of SendNotifyMessage
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Users\Admin\AppData\Roaming\SubDir\Client.exe | N/A |
Suspicious use of WriteProcessMemory
| Description | Indicator | Process | Target |
| PID 1460 wrote to memory of 1344 | N/A | C:\Users\Admin\AppData\Local\Temp\Client-built.exe | C:\Windows\SYSTEM32\schtasks.exe |
| PID 1460 wrote to memory of 1344 | N/A | C:\Users\Admin\AppData\Local\Temp\Client-built.exe | C:\Windows\SYSTEM32\schtasks.exe |
| PID 1460 wrote to memory of 116 | N/A | C:\Users\Admin\AppData\Local\Temp\Client-built.exe | C:\Users\Admin\AppData\Roaming\SubDir\Client.exe |
| PID 1460 wrote to memory of 116 | N/A | C:\Users\Admin\AppData\Local\Temp\Client-built.exe | C:\Users\Admin\AppData\Roaming\SubDir\Client.exe |
| PID 116 wrote to memory of 1816 | N/A | C:\Users\Admin\AppData\Roaming\SubDir\Client.exe | C:\Windows\SYSTEM32\schtasks.exe |
| PID 116 wrote to memory of 1816 | N/A | C:\Users\Admin\AppData\Roaming\SubDir\Client.exe | C:\Windows\SYSTEM32\schtasks.exe |
Uses Task Scheduler COM API
Processes
C:\Users\Admin\AppData\Local\Temp\Client-built.exe
"C:\Users\Admin\AppData\Local\Temp\Client-built.exe"
C:\Windows\SYSTEM32\schtasks.exe
"schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
"C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
C:\Windows\SYSTEM32\schtasks.exe
"schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
Network
| Country | Destination | Domain | Proto |
| US | 8.8.8.8:53 | 196.249.167.52.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 95.221.229.192.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 68.32.126.40.in-addr.arpa | udp |
| N/A | 192.168.0.18:4782 | tcp | |
| US | 8.8.8.8:53 | 88.156.103.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 209.205.72.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 58.55.71.13.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 217.106.137.52.in-addr.arpa | udp |
| N/A | 192.168.0.18:4782 | tcp | |
| US | 8.8.8.8:53 | 212.20.149.52.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 198.187.3.20.in-addr.arpa | udp |
| N/A | 192.168.0.18:4782 | tcp | |
| US | 8.8.8.8:53 | 88.210.23.2.in-addr.arpa | udp |
| N/A | 192.168.0.18:4782 | tcp | |
| US | 8.8.8.8:53 | 48.229.111.52.in-addr.arpa | udp |
| US | 8.8.8.8:53 | tse1.mm.bing.net | udp |
| US | 150.171.27.10:443 | tse1.mm.bing.net | tcp |
| US | 150.171.27.10:443 | tse1.mm.bing.net | tcp |
| US | 150.171.27.10:443 | tse1.mm.bing.net | tcp |
| US | 150.171.27.10:443 | tse1.mm.bing.net | tcp |
| US | 150.171.27.10:443 | tse1.mm.bing.net | tcp |
| N/A | 192.168.0.18:4782 | tcp | |
| N/A | 192.168.0.18:4782 | tcp |
Files
memory/1460-0-0x00007FFFAEA13000-0x00007FFFAEA15000-memory.dmp
memory/1460-1-0x00000000004B0000-0x00000000007D4000-memory.dmp
memory/1460-2-0x00007FFFAEA10000-0x00007FFFAF4D1000-memory.dmp
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
| MD5 | 671df8e1c2f83f10f1cfb3f447299806 |
| SHA1 | 9586ee12e49e5fbac96adfd5f3d59e4dfb8393f0 |
| SHA256 | 597a26bc8399acff834bbce2ccbe7d5bab0e190e7f9163c2bce5feacc7f77ee9 |
| SHA512 | 097a01e399d7527b0fc2bf952e7153d56b255897ef3f219cbd32938072d4ea66e62894d66f6b0ca80fbfda5c02738497d60c2ea415b0f900941a9c3121619690 |
memory/1460-9-0x00007FFFAEA10000-0x00007FFFAF4D1000-memory.dmp
memory/116-8-0x00007FFFAEA10000-0x00007FFFAF4D1000-memory.dmp
memory/116-10-0x00007FFFAEA10000-0x00007FFFAF4D1000-memory.dmp
memory/116-11-0x000000001D650000-0x000000001D6A0000-memory.dmp
memory/116-12-0x000000001D760000-0x000000001D812000-memory.dmp
memory/116-13-0x00007FFFAEA10000-0x00007FFFAF4D1000-memory.dmp
Analysis: behavioral2
Detonation Overview
Submitted
2024-11-03 07:12
Reported
2024-11-03 07:15
Platform
win10ltsc2021-20241023-en
Max time kernel
127s
Max time network
146s
Command Line
Signatures
Quasar RAT
Quasar family
Quasar payload
| 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\SubDir\Client.exe | N/A |
Enumerates physical storage devices
Scheduled Task/Job: Scheduled Task
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windows\SYSTEM32\schtasks.exe | N/A |
| N/A | N/A | C:\Windows\SYSTEM32\schtasks.exe | N/A |
Suspicious use of AdjustPrivilegeToken
| Description | Indicator | Process | Target |
| Token: SeDebugPrivilege | N/A | C:\Users\Admin\AppData\Local\Temp\Client-built.exe | N/A |
| Token: SeDebugPrivilege | N/A | C:\Users\Admin\AppData\Roaming\SubDir\Client.exe | N/A |
Suspicious use of FindShellTrayWindow
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Users\Admin\AppData\Roaming\SubDir\Client.exe | N/A |
Suspicious use of SendNotifyMessage
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Users\Admin\AppData\Roaming\SubDir\Client.exe | N/A |
Suspicious use of WriteProcessMemory
| Description | Indicator | Process | Target |
| PID 4460 wrote to memory of 4880 | N/A | C:\Users\Admin\AppData\Local\Temp\Client-built.exe | C:\Windows\SYSTEM32\schtasks.exe |
| PID 4460 wrote to memory of 4880 | N/A | C:\Users\Admin\AppData\Local\Temp\Client-built.exe | C:\Windows\SYSTEM32\schtasks.exe |
| PID 4460 wrote to memory of 2532 | N/A | C:\Users\Admin\AppData\Local\Temp\Client-built.exe | C:\Users\Admin\AppData\Roaming\SubDir\Client.exe |
| PID 4460 wrote to memory of 2532 | N/A | C:\Users\Admin\AppData\Local\Temp\Client-built.exe | C:\Users\Admin\AppData\Roaming\SubDir\Client.exe |
| PID 2532 wrote to memory of 4896 | N/A | C:\Users\Admin\AppData\Roaming\SubDir\Client.exe | C:\Windows\SYSTEM32\schtasks.exe |
| PID 2532 wrote to memory of 4896 | N/A | C:\Users\Admin\AppData\Roaming\SubDir\Client.exe | C:\Windows\SYSTEM32\schtasks.exe |
Uses Task Scheduler COM API
Processes
C:\Users\Admin\AppData\Local\Temp\Client-built.exe
"C:\Users\Admin\AppData\Local\Temp\Client-built.exe"
C:\Windows\SYSTEM32\schtasks.exe
"schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
"C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
C:\Windows\SYSTEM32\schtasks.exe
"schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
Network
| Country | Destination | Domain | Proto |
| US | 8.8.8.8:53 | 8.8.8.8.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 58.55.71.13.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 172.214.232.199.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 68.32.126.40.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 95.221.229.192.in-addr.arpa | udp |
| N/A | 192.168.0.18:4782 | tcp | |
| US | 8.8.8.8:53 | 217.106.137.52.in-addr.arpa | udp |
| N/A | 192.168.0.18:4782 | tcp | |
| US | 8.8.8.8:53 | 53.210.109.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 198.187.3.20.in-addr.arpa | udp |
| N/A | 192.168.0.18:4782 | tcp | |
| US | 8.8.8.8:53 | 240.221.184.93.in-addr.arpa | udp |
| N/A | 192.168.0.18:4782 | tcp | |
| N/A | 192.168.0.18:4782 | tcp | |
| N/A | 192.168.0.18:4782 | tcp |
Files
memory/4460-0-0x00007FFE261B3000-0x00007FFE261B5000-memory.dmp
memory/4460-1-0x00000000009B0000-0x0000000000CD4000-memory.dmp
memory/4460-2-0x00007FFE261B0000-0x00007FFE26C72000-memory.dmp
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
| MD5 | 671df8e1c2f83f10f1cfb3f447299806 |
| SHA1 | 9586ee12e49e5fbac96adfd5f3d59e4dfb8393f0 |
| SHA256 | 597a26bc8399acff834bbce2ccbe7d5bab0e190e7f9163c2bce5feacc7f77ee9 |
| SHA512 | 097a01e399d7527b0fc2bf952e7153d56b255897ef3f219cbd32938072d4ea66e62894d66f6b0ca80fbfda5c02738497d60c2ea415b0f900941a9c3121619690 |
memory/4460-5-0x00007FFE261B0000-0x00007FFE26C72000-memory.dmp
memory/2532-6-0x00007FFE261B0000-0x00007FFE26C72000-memory.dmp
memory/2532-7-0x00007FFE261B0000-0x00007FFE26C72000-memory.dmp
memory/2532-8-0x000000001D710000-0x000000001D760000-memory.dmp
memory/2532-9-0x000000001D820000-0x000000001D8D2000-memory.dmp
memory/2532-10-0x00007FFE261B0000-0x00007FFE26C72000-memory.dmp
Analysis: behavioral3
Detonation Overview
Submitted
2024-11-03 07:12
Reported
2024-11-03 07:15
Platform
win11-20241007-en
Max time kernel
127s
Max time network
146s
Command Line
Signatures
Quasar RAT
Quasar family
Quasar payload
| 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\SubDir\Client.exe | N/A |
Enumerates physical storage devices
Scheduled Task/Job: Scheduled Task
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windows\SYSTEM32\schtasks.exe | N/A |
| N/A | N/A | C:\Windows\SYSTEM32\schtasks.exe | N/A |
Suspicious use of AdjustPrivilegeToken
| Description | Indicator | Process | Target |
| Token: SeDebugPrivilege | N/A | C:\Users\Admin\AppData\Local\Temp\Client-built.exe | N/A |
| Token: SeDebugPrivilege | N/A | C:\Users\Admin\AppData\Roaming\SubDir\Client.exe | N/A |
Suspicious use of FindShellTrayWindow
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Users\Admin\AppData\Roaming\SubDir\Client.exe | N/A |
Suspicious use of SendNotifyMessage
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Users\Admin\AppData\Roaming\SubDir\Client.exe | N/A |
Suspicious use of WriteProcessMemory
| Description | Indicator | Process | Target |
| PID 1260 wrote to memory of 1132 | N/A | C:\Users\Admin\AppData\Local\Temp\Client-built.exe | C:\Windows\SYSTEM32\schtasks.exe |
| PID 1260 wrote to memory of 1132 | N/A | C:\Users\Admin\AppData\Local\Temp\Client-built.exe | C:\Windows\SYSTEM32\schtasks.exe |
| PID 1260 wrote to memory of 3616 | N/A | C:\Users\Admin\AppData\Local\Temp\Client-built.exe | C:\Users\Admin\AppData\Roaming\SubDir\Client.exe |
| PID 1260 wrote to memory of 3616 | N/A | C:\Users\Admin\AppData\Local\Temp\Client-built.exe | C:\Users\Admin\AppData\Roaming\SubDir\Client.exe |
| PID 3616 wrote to memory of 2748 | N/A | C:\Users\Admin\AppData\Roaming\SubDir\Client.exe | C:\Windows\SYSTEM32\schtasks.exe |
| PID 3616 wrote to memory of 2748 | N/A | C:\Users\Admin\AppData\Roaming\SubDir\Client.exe | C:\Windows\SYSTEM32\schtasks.exe |
Uses Task Scheduler COM API
Processes
C:\Users\Admin\AppData\Local\Temp\Client-built.exe
"C:\Users\Admin\AppData\Local\Temp\Client-built.exe"
C:\Windows\SYSTEM32\schtasks.exe
"schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
"C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
C:\Windows\SYSTEM32\schtasks.exe
"schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
Network
| Country | Destination | Domain | Proto |
| N/A | 192.168.0.18:4782 | tcp | |
| N/A | 192.168.0.18:4782 | tcp | |
| US | 8.8.8.8:53 | 8.8.8.8.in-addr.arpa | udp |
| N/A | 192.168.0.18:4782 | tcp | |
| N/A | 192.168.0.18:4782 | tcp | |
| N/A | 192.168.0.18:4782 | tcp | |
| N/A | 192.168.0.18:4782 | tcp |
Files
memory/1260-0-0x00007FFD38193000-0x00007FFD38195000-memory.dmp
memory/1260-1-0x0000000000E50000-0x0000000001174000-memory.dmp
memory/1260-2-0x00007FFD38190000-0x00007FFD38C52000-memory.dmp
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
| MD5 | 671df8e1c2f83f10f1cfb3f447299806 |
| SHA1 | 9586ee12e49e5fbac96adfd5f3d59e4dfb8393f0 |
| SHA256 | 597a26bc8399acff834bbce2ccbe7d5bab0e190e7f9163c2bce5feacc7f77ee9 |
| SHA512 | 097a01e399d7527b0fc2bf952e7153d56b255897ef3f219cbd32938072d4ea66e62894d66f6b0ca80fbfda5c02738497d60c2ea415b0f900941a9c3121619690 |
memory/1260-8-0x00007FFD38190000-0x00007FFD38C52000-memory.dmp
memory/3616-9-0x00007FFD38190000-0x00007FFD38C52000-memory.dmp
memory/3616-10-0x00007FFD38190000-0x00007FFD38C52000-memory.dmp
memory/3616-11-0x000000001C000000-0x000000001C050000-memory.dmp
memory/3616-12-0x000000001C110000-0x000000001C1C2000-memory.dmp
memory/3616-13-0x00007FFD38190000-0x00007FFD38C52000-memory.dmp
Analysis: behavioral4
Detonation Overview
Submitted
2024-11-03 07:12
Reported
2024-11-03 07:16
Platform
win7-20241010-en
Max time kernel
122s
Max time network
129s
Command Line
Signatures
Quasar RAT
Quasar family
Quasar payload
| Description | Indicator | Process | Target |
| N/A | N/A | N/A | N/A |
Scheduled Task/Job: Scheduled Task
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windows\system32\schtasks.exe | N/A |
Suspicious use of AdjustPrivilegeToken
| Description | Indicator | Process | Target |
| Token: SeDebugPrivilege | N/A | C:\Users\Admin\AppData\Local\Temp\Client-built.exe | N/A |
Suspicious use of WriteProcessMemory
| Description | Indicator | Process | Target |
| PID 2368 wrote to memory of 2308 | N/A | C:\Users\Admin\AppData\Local\Temp\Client-built.exe | C:\Windows\system32\schtasks.exe |
| PID 2368 wrote to memory of 2308 | N/A | C:\Users\Admin\AppData\Local\Temp\Client-built.exe | C:\Windows\system32\schtasks.exe |
| PID 2368 wrote to memory of 2308 | N/A | C:\Users\Admin\AppData\Local\Temp\Client-built.exe | C:\Windows\system32\schtasks.exe |
Uses Task Scheduler COM API
Processes
C:\Users\Admin\AppData\Local\Temp\Client-built.exe
"C:\Users\Admin\AppData\Local\Temp\Client-built.exe"
C:\Windows\system32\schtasks.exe
"schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
Network
Files
memory/2368-0-0x000007FEF5653000-0x000007FEF5654000-memory.dmp
memory/2368-1-0x0000000000F20000-0x0000000001244000-memory.dmp
memory/2368-2-0x000007FEF5650000-0x000007FEF603C000-memory.dmp
memory/2368-4-0x000007FEF5653000-0x000007FEF5654000-memory.dmp
memory/2368-5-0x000007FEF5650000-0x000007FEF603C000-memory.dmp