Analysis Overview
SHA256
d7a8958c5fde707a0943fb7021e254fd142fb434f4d9b7fcd03f1857ddfeeea9
Threat Level: Known bad
The file Client.exe was found to be: Known bad.
Malicious Activity Summary
Quasar family
Quasar payload
Quasar RAT
Executes dropped EXE
Unsigned PE
Creates scheduled task(s)
Suspicious use of SetWindowsHookEx
Suspicious use of WriteProcessMemory
Suspicious use of AdjustPrivilegeToken
Uses Task Scheduler COM API
MITRE ATT&CK
Enterprise Matrix V15
Analysis: static1
Detonation Overview
Reported
2024-01-08 09:48
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
2024-01-08 09:48
Reported
2024-01-08 09:50
Platform
win7-20231215-en
Max time kernel
149s
Max time network
150s
Command Line
Signatures
Quasar RAT
Quasar payload
| 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 |
| 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 |
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.exe | N/A |
| Token: SeDebugPrivilege | N/A | C:\Users\Admin\AppData\Roaming\SubDir\Client.exe | N/A |
Suspicious use of SetWindowsHookEx
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Users\Admin\AppData\Roaming\SubDir\Client.exe | N/A |
Suspicious use of WriteProcessMemory
Uses Task Scheduler COM API
Processes
C:\Users\Admin\AppData\Local\Temp\Client.exe
"C:\Users\Admin\AppData\Local\Temp\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
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 | 192.168.0.145:4782 | tcp | |
| N/A | 192.168.0.145:4782 | tcp | |
| N/A | 192.168.0.145:4782 | tcp | |
| N/A | 192.168.0.145:4782 | tcp | |
| N/A | 192.168.0.145:4782 | tcp | |
| N/A | 192.168.0.145:4782 | tcp | |
| N/A | 192.168.0.145:4782 | tcp |
Files
memory/1564-0-0x0000000000BC0000-0x0000000000EE4000-memory.dmp
memory/1564-1-0x000007FEF5300000-0x000007FEF5CEC000-memory.dmp
memory/1564-2-0x000000001B1B0000-0x000000001B230000-memory.dmp
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
| MD5 | 48326c4d7f7305cd367d69c61593db38 |
| SHA1 | 731b05943fba78cd161d50ae2b9f50392aff12d1 |
| SHA256 | ebf8d5fd18e458810280879cc1e782b9b0180083049301939060f21c55f2abfe |
| SHA512 | d3e6ae47d10345eae1fe32237d50a467cd4a62e5f27708de8183b3506cba20a404bf83bf3573d97c193c03fe545004c130c86c0a65e5502f062c6d8aae3697ab |
memory/2372-9-0x000007FEF5300000-0x000007FEF5CEC000-memory.dmp
memory/2372-10-0x000000001B3F0000-0x000000001B470000-memory.dmp
memory/2372-8-0x00000000009F0000-0x0000000000D14000-memory.dmp
memory/1564-7-0x000007FEF5300000-0x000007FEF5CEC000-memory.dmp
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
| MD5 | bfb70f6b45d4239bda6c60afb185c415 |
| SHA1 | 99a8ed14889cd4c594bc9ff0e6be09b2abb63d74 |
| SHA256 | be456c09857247d734e975107e8522bf09bba7833e13ecff434db231e44a1e6a |
| SHA512 | 7dd523b21a1558847e6262b34389ba53ee0b55816e92f79c8539b0f8037c52a69ea19af4b0bd21d3187000124032168c2c8fdf9e19248945355651294f2ed0d8 |
memory/2372-11-0x000007FEF5300000-0x000007FEF5CEC000-memory.dmp
memory/2372-12-0x000000001B3F0000-0x000000001B470000-memory.dmp
Analysis: behavioral2
Detonation Overview
Submitted
2024-01-08 09:48
Reported
2024-01-08 09:51
Platform
win10v2004-20231215-en
Max time kernel
156s
Max time network
171s
Command Line
Signatures
Quasar RAT
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 |
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.exe | N/A |
| Token: SeDebugPrivilege | N/A | C:\Users\Admin\AppData\Roaming\SubDir\Client.exe | N/A |
Suspicious use of SetWindowsHookEx
| 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 3988 wrote to memory of 4780 | N/A | C:\Users\Admin\AppData\Local\Temp\Client.exe | C:\Windows\SYSTEM32\schtasks.exe |
| PID 3988 wrote to memory of 4780 | N/A | C:\Users\Admin\AppData\Local\Temp\Client.exe | C:\Windows\SYSTEM32\schtasks.exe |
| PID 3988 wrote to memory of 3800 | N/A | C:\Users\Admin\AppData\Local\Temp\Client.exe | C:\Users\Admin\AppData\Roaming\SubDir\Client.exe |
| PID 3988 wrote to memory of 3800 | N/A | C:\Users\Admin\AppData\Local\Temp\Client.exe | C:\Users\Admin\AppData\Roaming\SubDir\Client.exe |
| PID 3800 wrote to memory of 3108 | N/A | C:\Users\Admin\AppData\Roaming\SubDir\Client.exe | C:\Windows\SYSTEM32\schtasks.exe |
| PID 3800 wrote to memory of 3108 | 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.exe
"C:\Users\Admin\AppData\Local\Temp\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
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 | 22.177.190.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 95.221.229.192.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 9.228.82.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 26.35.223.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 114.110.16.96.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 41.110.16.96.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 59.128.231.4.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 50.23.12.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 15.164.165.52.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 134.71.91.104.in-addr.arpa | udp |
| N/A | 192.168.0.145:4782 | tcp | |
| US | 8.8.8.8:53 | 2.136.104.51.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 23.236.111.52.in-addr.arpa | udp |
| N/A | 192.168.0.145:4782 | tcp | |
| US | 8.8.8.8:53 | 158.240.127.40.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 88.156.103.20.in-addr.arpa | udp |
| N/A | 192.168.0.145:4782 | tcp | |
| US | 8.8.8.8:53 | 18.173.189.20.in-addr.arpa | udp |
| N/A | 192.168.0.145:4782 | tcp | |
| US | 8.8.8.8:53 | tse1.mm.bing.net | udp |
| US | 204.79.197.200:443 | tse1.mm.bing.net | tcp |
| US | 204.79.197.200:443 | tse1.mm.bing.net | tcp |
| US | 204.79.197.200:443 | tse1.mm.bing.net | tcp |
| US | 204.79.197.200:443 | tse1.mm.bing.net | tcp |
| US | 204.79.197.200:443 | tse1.mm.bing.net | tcp |
| US | 8.8.8.8:53 | 200.197.79.204.in-addr.arpa | udp |
| N/A | 192.168.0.145:4782 | tcp |
Files
memory/3988-0-0x0000000000160000-0x0000000000484000-memory.dmp
memory/3988-1-0x00007FF99DF60000-0x00007FF99EA21000-memory.dmp
memory/3988-2-0x000000001B010000-0x000000001B020000-memory.dmp
memory/3988-3-0x00007FF99DF60000-0x00007FF99EA21000-memory.dmp
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
| MD5 | 228e6dce6f5770e966b7e2be915aec8b |
| SHA1 | 96886116cd9472d6cffb38ff90567c4cf5b4f608 |
| SHA256 | d7a8958c5fde707a0943fb7021e254fd142fb434f4d9b7fcd03f1857ddfeeea9 |
| SHA512 | 5f75ac6af421291df9dade1edc4969b584b1264e6cfb027f58a23c199e4f82b98a24f21cbc755cd7f0d16ea4291160765c49e651c95273f891f79c419076fd6d |
C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\Client.exe.log
| MD5 | baf55b95da4a601229647f25dad12878 |
| SHA1 | abc16954ebfd213733c4493fc1910164d825cac8 |
| SHA256 | ee954c5d8156fd8890e582c716e5758ed9b33721258f10e758bdc31ccbcb1924 |
| SHA512 | 24f502fedb1a305d0d7b08857ffc1db9b2359ff34e06d5748ecc84e35c985f29a20d9f0a533bea32d234ab37097ec0481620c63b14ac89b280e75e14d19fd545 |
memory/3800-10-0x00007FF99DF60000-0x00007FF99EA21000-memory.dmp
memory/3988-11-0x000000001B010000-0x000000001B020000-memory.dmp
memory/3800-12-0x0000000002C70000-0x0000000002C80000-memory.dmp
memory/3988-13-0x00007FF99DF60000-0x00007FF99EA21000-memory.dmp
memory/3800-14-0x000000001C080000-0x000000001C0D0000-memory.dmp
memory/3800-15-0x000000001C190000-0x000000001C242000-memory.dmp
memory/3800-16-0x00007FF99DF60000-0x00007FF99EA21000-memory.dmp