Analysis Overview
SHA256
37d30f9f28f61ffeb1a8f041167966dc075c62b123d832e738548cd4909d54fd
Threat Level: Known bad
The file Client-built.exe was found to be: Known bad.
Malicious Activity Summary
Quasar family
Quasar payload
Quasar RAT
Executes dropped EXE
Unsigned PE
Suspicious use of AdjustPrivilegeToken
Suspicious use of WriteProcessMemory
Creates scheduled task(s)
Uses Task Scheduler COM API
MITRE ATT&CK
Enterprise Matrix V15
Analysis: static1
Detonation Overview
Reported
2023-12-27 22:50
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
2023-12-27 22:50
Reported
2023-12-27 22:53
Platform
win10v2004-20231215-en
Max time kernel
148s
Max time network
152s
Command Line
Signatures
Quasar RAT
Quasar payload
| Description | Indicator | Process | Target |
| N/A | N/A | N/A | N/A |
Executes dropped EXE
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Users\Admin\AppData\Roaming\Realtek HD Audio Universal Service\RtkAudUService64.exe | N/A |
Creates scheduled task(s)
| 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\Realtek HD Audio Universal Service\RtkAudUService64.exe | N/A |
Suspicious use of WriteProcessMemory
| Description | Indicator | Process | Target |
| PID 5048 wrote to memory of 1648 | N/A | C:\Users\Admin\AppData\Local\Temp\Client-built.exe | C:\Windows\SYSTEM32\schtasks.exe |
| PID 5048 wrote to memory of 1648 | N/A | C:\Users\Admin\AppData\Local\Temp\Client-built.exe | C:\Windows\SYSTEM32\schtasks.exe |
| PID 5048 wrote to memory of 4224 | N/A | C:\Users\Admin\AppData\Local\Temp\Client-built.exe | C:\Users\Admin\AppData\Roaming\Realtek HD Audio Universal Service\RtkAudUService64.exe |
| PID 5048 wrote to memory of 4224 | N/A | C:\Users\Admin\AppData\Local\Temp\Client-built.exe | C:\Users\Admin\AppData\Roaming\Realtek HD Audio Universal Service\RtkAudUService64.exe |
| PID 4224 wrote to memory of 380 | N/A | C:\Users\Admin\AppData\Roaming\Realtek HD Audio Universal Service\RtkAudUService64.exe | C:\Windows\SYSTEM32\schtasks.exe |
| PID 4224 wrote to memory of 380 | N/A | C:\Users\Admin\AppData\Roaming\Realtek HD Audio Universal Service\RtkAudUService64.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:\Users\Admin\AppData\Roaming\Realtek HD Audio Universal Service\RtkAudUService64.exe
"C:\Users\Admin\AppData\Roaming\Realtek HD Audio Universal Service\RtkAudUService64.exe"
C:\Windows\SYSTEM32\schtasks.exe
"schtasks" /create /tn "Realtek HD Audio Universal Service" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\Realtek HD Audio Universal Service\RtkAudUService64.exe" /rl HIGHEST /f
C:\Windows\SYSTEM32\schtasks.exe
"schtasks" /create /tn "Realtek HD Audio Universal Service" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\Realtek HD Audio Universal Service\RtkAudUService64.exe" /rl HIGHEST /f
Network
| Country | Destination | Domain | Proto |
| US | 8.8.8.8:53 | g.bing.com | udp |
| US | 8.8.8.8:53 | 59.128.231.4.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 22.177.190.20.in-addr.arpa | udp |
| N/A | 192.168.178.197:4782 | tcp | |
| US | 8.8.8.8:53 | 95.221.229.192.in-addr.arpa | udp |
| US | 204.79.197.200:443 | g.bing.com | tcp |
| US | 8.8.8.8:53 | 200.197.79.204.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 9.228.82.20.in-addr.arpa | udp |
| N/A | 192.168.178.197:4782 | tcp | |
| US | 8.8.8.8:53 | 173.178.17.96.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 134.71.91.104.in-addr.arpa | udp |
| US | 138.91.171.81:80 | tcp | |
| US | 138.91.171.81:80 | tcp | |
| US | 8.8.8.8:53 | 88.156.103.20.in-addr.arpa | udp |
| N/A | 192.168.178.197:4782 | tcp | |
| US | 8.8.8.8:53 | udp | |
| US | 8.8.8.8:53 | udp | |
| GB | 96.16.110.41:443 | tcp | |
| US | 8.8.8.8:53 | udp | |
| US | 8.8.8.8:53 | udp | |
| US | 8.8.8.8:53 | udp | |
| US | 8.8.8.8:53 | udp | |
| N/A | 52.165.164.15:443 | tcp | |
| N/A | 51.104.136.2:443 | tcp | |
| N/A | 51.104.136.2:443 | tcp | |
| US | 8.8.8.8:53 | udp | |
| US | 8.8.8.8:53 | udp | |
| US | 8.8.8.8:53 | udp | |
| GB | 96.16.110.114:80 | tcp | |
| US | 20.231.121.79:80 | tcp | |
| N/A | 192.168.178.197:4782 | tcp | |
| GB | 96.16.110.114:80 | tcp | |
| US | 8.8.8.8:53 | udp | |
| US | 138.91.171.81:80 | tcp | |
| GB | 96.16.110.114:80 | tcp | |
| US | 8.8.8.8:53 | udp | |
| US | 8.8.8.8:53 | udp | |
| US | 8.8.8.8:53 | udp | |
| N/A | 52.165.164.15:443 | tcp | |
| N/A | 23.37.1.183:80 | tcp | |
| N/A | 23.37.1.183:80 | tcp | |
| US | 8.8.8.8:53 | udp | |
| US | 8.8.8.8:53 | udp | |
| US | 8.8.8.8:53 | 48.229.111.52.in-addr.arpa | udp |
| US | 8.8.8.8:53 | udp | |
| US | 8.8.8.8:53 | udp | |
| N/A | 20.54.110.119:443 | tcp | |
| N/A | 52.165.164.15:443 | tcp | |
| US | 8.8.8.8:53 | udp | |
| GB | 96.17.178.173:80 | tcp | |
| US | 8.8.8.8:53 | udp | |
| US | 8.8.8.8:53 | udp | |
| US | 8.8.8.8:53 | udp | |
| N/A | 192.168.178.197:4782 | tcp | |
| US | 8.8.8.8:53 | udp | |
| US | 204.79.197.200:443 | g.bing.com | tcp |
| US | 204.79.197.200:443 | g.bing.com | tcp |
| US | 204.79.197.200:443 | g.bing.com | tcp |
| US | 204.79.197.200:443 | g.bing.com | tcp |
| US | 204.79.197.200:443 | g.bing.com | tcp |
| N/A | 192.168.178.197:4782 | tcp | |
| N/A | 192.168.178.197:4782 | tcp |
Files
memory/5048-0-0x0000000000BD0000-0x0000000000EF4000-memory.dmp
memory/5048-1-0x00007FFE123D0000-0x00007FFE12E91000-memory.dmp
memory/5048-2-0x000000001BD40000-0x000000001BD50000-memory.dmp
memory/4224-10-0x00007FFE123D0000-0x00007FFE12E91000-memory.dmp
memory/4224-11-0x000000001B8A0000-0x000000001B8B0000-memory.dmp
memory/5048-9-0x00007FFE123D0000-0x00007FFE12E91000-memory.dmp
memory/4224-12-0x000000001BFF0000-0x000000001C040000-memory.dmp
memory/4224-13-0x000000001C100000-0x000000001C1B2000-memory.dmp
memory/4224-14-0x00007FFE123D0000-0x00007FFE12E91000-memory.dmp
memory/4224-15-0x000000001B8A0000-0x000000001B8B0000-memory.dmp