Analysis Overview
SHA256
8555743631267a78de02ae65d5454e3bfc2ac6c5336dab259fcff5316aba840c
Threat Level: Known bad
The file Client.exe was found to be: Known bad.
Malicious Activity Summary
Quasar RAT
Quasar payload
Quasar family
Executes dropped EXE
Unsigned PE
Suspicious use of AdjustPrivilegeToken
Suspicious use of WriteProcessMemory
Creates scheduled task(s)
Suspicious use of SetWindowsHookEx
Uses Task Scheduler COM API
MITRE ATT&CK
Enterprise Matrix V15
Analysis: static1
Detonation Overview
Reported
2024-01-08 11:59
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 11:59
Reported
2024-01-08 12:02
Platform
win7-20231215-en
Max time kernel
134s
Max time network
164s
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
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 | s4.v100.vip | udp |
| CN | 43.248.117.189:27923 | s4.v100.vip | tcp |
| CN | 43.248.117.189:27923 | s4.v100.vip | tcp |
| CN | 43.248.117.189:27923 | s4.v100.vip | tcp |
| CN | 43.248.117.189:27923 | s4.v100.vip | tcp |
| CN | 43.248.117.189:27923 | s4.v100.vip | tcp |
| CN | 43.248.117.189:27923 | s4.v100.vip | tcp |
Files
memory/2476-1-0x000007FEF5A30000-0x000007FEF641C000-memory.dmp
memory/2476-0-0x0000000001240000-0x0000000001564000-memory.dmp
memory/2476-2-0x000000001B260000-0x000000001B2E0000-memory.dmp
memory/2476-7-0x000007FEF5A30000-0x000007FEF641C000-memory.dmp
memory/1704-9-0x0000000000360000-0x0000000000684000-memory.dmp
memory/1704-8-0x000007FEF5A30000-0x000007FEF641C000-memory.dmp
memory/1704-10-0x000000001AB90000-0x000000001AC10000-memory.dmp
memory/1704-11-0x000007FEF5A30000-0x000007FEF641C000-memory.dmp
memory/1704-12-0x000000001AB90000-0x000000001AC10000-memory.dmp
Analysis: behavioral2
Detonation Overview
Submitted
2024-01-08 11:59
Reported
2024-01-08 12:02
Platform
win10v2004-20231215-en
Max time kernel
153s
Max time network
166s
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 4976 wrote to memory of 1936 | N/A | C:\Users\Admin\AppData\Local\Temp\Client.exe | C:\Windows\SYSTEM32\schtasks.exe |
| PID 4976 wrote to memory of 1936 | N/A | C:\Users\Admin\AppData\Local\Temp\Client.exe | C:\Windows\SYSTEM32\schtasks.exe |
| PID 4976 wrote to memory of 3912 | N/A | C:\Users\Admin\AppData\Local\Temp\Client.exe | C:\Users\Admin\AppData\Roaming\SubDir\Client.exe |
| PID 4976 wrote to memory of 3912 | N/A | C:\Users\Admin\AppData\Local\Temp\Client.exe | C:\Users\Admin\AppData\Roaming\SubDir\Client.exe |
| PID 3912 wrote to memory of 1472 | N/A | C:\Users\Admin\AppData\Roaming\SubDir\Client.exe | C:\Windows\SYSTEM32\schtasks.exe |
| PID 3912 wrote to memory of 1472 | 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 | 138.91.171.81:80 | tcp | |
| US | 8.8.8.8:53 | 147.177.190.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 240.221.184.93.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 95.221.229.192.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 59.128.231.4.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 241.154.82.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 55.36.223.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | s4.v100.vip | udp |
| CN | 43.248.117.189:27923 | s4.v100.vip | tcp |
| US | 8.8.8.8:53 | 86.23.85.13.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 158.240.127.40.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 41.110.16.96.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 206.23.85.13.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 134.71.91.104.in-addr.arpa | udp |
| CN | 43.248.117.189:27923 | s4.v100.vip | tcp |
| US | 8.8.8.8:53 | 26.35.223.20.in-addr.arpa | udp |
| 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 |
| US | 92.123.241.104:80 | tcp | |
| US | 8.8.8.8:53 | 104.241.123.92.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 119.110.54.20.in-addr.arpa | udp |
| CN | 43.248.117.189:27923 | s4.v100.vip | tcp |
| US | 8.8.8.8:53 | 178.178.17.96.in-addr.arpa | udp |
| CN | 43.248.117.189:27923 | s4.v100.vip | tcp |
| US | 8.8.8.8:53 | 174.178.17.96.in-addr.arpa | udp |
| US | 8.8.8.8:53 | udp | |
| US | 92.123.241.104:80 | tcp | |
| US | 8.8.8.8:53 | udp | |
| US | 93.184.221.240:80 | tcp | |
| US | 93.184.221.240:80 | tcp | |
| US | 8.8.8.8:53 | udp | |
| GB | 96.17.178.174:80 | tcp | |
| CN | 43.248.117.189:27923 | s4.v100.vip | tcp |
| GB | 96.17.178.174:80 | tcp | |
| GB | 96.17.178.174:80 | tcp | |
| GB | 96.17.178.174:80 | tcp | |
| GB | 96.17.178.174:80 | tcp | |
| US | 8.8.8.8:53 | udp | |
| US | 8.8.8.8:53 | udp | |
| US | 192.229.221.95:80 | tcp | |
| CN | 43.248.117.189:27923 | s4.v100.vip | tcp |
| US | 8.8.8.8:53 | udp |
Files
memory/4976-0-0x0000000000630000-0x0000000000954000-memory.dmp
memory/4976-2-0x000000001B780000-0x000000001B790000-memory.dmp
memory/4976-1-0x00007FF9D39A0000-0x00007FF9D4461000-memory.dmp
C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\Client.exe.log
| MD5 | baf55b95da4a601229647f25dad12878 |
| SHA1 | abc16954ebfd213733c4493fc1910164d825cac8 |
| SHA256 | ee954c5d8156fd8890e582c716e5758ed9b33721258f10e758bdc31ccbcb1924 |
| SHA512 | 24f502fedb1a305d0d7b08857ffc1db9b2359ff34e06d5748ecc84e35c985f29a20d9f0a533bea32d234ab37097ec0481620c63b14ac89b280e75e14d19fd545 |
memory/4976-10-0x00007FF9D39A0000-0x00007FF9D4461000-memory.dmp
memory/3912-11-0x000000001B560000-0x000000001B570000-memory.dmp
memory/3912-9-0x00007FF9D39A0000-0x00007FF9D4461000-memory.dmp
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
| MD5 | 379dba3ccd9f0cf1bbf0be8e4c0f5b17 |
| SHA1 | a627b49c6a4c44df8c38e1814c9e73f2256479c2 |
| SHA256 | 6a345b8019c0d9f3783addf793ac867781ca0990e1a7b29f32db90d970934bca |
| SHA512 | 20e6f85d2a174182834561c1effefea008d0aedc4d66efe49fbaef67b928064768e825e78a171e6f755082b2b3661ed20bdc39bf4e493392771f5f46a2ccc899 |
memory/3912-12-0x0000000002AA0000-0x0000000002AF0000-memory.dmp
memory/3912-13-0x000000001BC30000-0x000000001BCE2000-memory.dmp
memory/3912-14-0x00007FF9D39A0000-0x00007FF9D4461000-memory.dmp
memory/3912-15-0x000000001B560000-0x000000001B570000-memory.dmp