Analysis Overview
SHA256
fc564833b7c6fc4e991eb80e075d1c36306b9828172609ad311216ec5fc647f4
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
Enumerates physical storage devices
Scheduled Task/Job: Scheduled Task
Suspicious use of SendNotifyMessage
Suspicious use of WriteProcessMemory
Suspicious use of AdjustPrivilegeToken
Suspicious use of FindShellTrayWindow
Uses Task Scheduler COM API
MITRE ATT&CK
Enterprise Matrix V15
Analysis: static1
Detonation Overview
Reported
2024-10-31 00:37
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
2024-10-31 00:37
Reported
2024-10-31 00:40
Platform
win7-20240903-en
Max time kernel
149s
Max time network
136s
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 |
| 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
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 | 10.127.1.2:1604 | tcp | |
| N/A | 10.127.1.2:1604 | tcp | |
| N/A | 10.127.1.2:1604 | tcp | |
| N/A | 10.127.1.2:1604 | tcp | |
| N/A | 10.127.1.2:1604 | tcp | |
| N/A | 10.127.1.2:1604 | tcp | |
| N/A | 10.127.1.2:1604 | tcp |
Files
memory/2348-0-0x000007FEF6083000-0x000007FEF6084000-memory.dmp
memory/2348-1-0x0000000000910000-0x0000000000C34000-memory.dmp
memory/2348-2-0x000007FEF6080000-0x000007FEF6A6C000-memory.dmp
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
| MD5 | dca77ba52c9e20bdb3fcb81657918f89 |
| SHA1 | 7cec39d83783008bb9a151b2a71dbc1eb03a7bbf |
| SHA256 | fc564833b7c6fc4e991eb80e075d1c36306b9828172609ad311216ec5fc647f4 |
| SHA512 | 30fe235a26fe74a1fe27caafe059ee5463790252b046a5e467a0d938f1b77a05c0850a37883066a0d4c7bbd11f1bf36bf7a35e4ef3da86d4f7b2c240f2d8929a |
memory/1872-7-0x000007FEF6080000-0x000007FEF6A6C000-memory.dmp
memory/2348-9-0x000007FEF6080000-0x000007FEF6A6C000-memory.dmp
memory/1872-8-0x00000000012C0000-0x00000000015E4000-memory.dmp
memory/1872-10-0x000007FEF6080000-0x000007FEF6A6C000-memory.dmp
memory/1872-11-0x000007FEF6080000-0x000007FEF6A6C000-memory.dmp
Analysis: behavioral2
Detonation Overview
Submitted
2024-10-31 00:37
Reported
2024-10-31 00:40
Platform
win10v2004-20241007-en
Max time kernel
145s
Max time network
148s
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 3528 wrote to memory of 4856 | N/A | C:\Users\Admin\AppData\Local\Temp\Client-built.exe | C:\Windows\SYSTEM32\schtasks.exe |
| PID 3528 wrote to memory of 4856 | N/A | C:\Users\Admin\AppData\Local\Temp\Client-built.exe | C:\Windows\SYSTEM32\schtasks.exe |
| PID 3528 wrote to memory of 528 | N/A | C:\Users\Admin\AppData\Local\Temp\Client-built.exe | C:\Users\Admin\AppData\Roaming\SubDir\Client.exe |
| PID 3528 wrote to memory of 528 | N/A | C:\Users\Admin\AppData\Local\Temp\Client-built.exe | C:\Users\Admin\AppData\Roaming\SubDir\Client.exe |
| PID 528 wrote to memory of 4564 | N/A | C:\Users\Admin\AppData\Roaming\SubDir\Client.exe | C:\Windows\SYSTEM32\schtasks.exe |
| PID 528 wrote to memory of 4564 | 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 | 149.220.183.52.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 226.108.222.173.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 72.32.126.40.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 95.221.229.192.in-addr.arpa | udp |
| US | 8.8.8.8:53 | g.bing.com | udp |
| US | 150.171.27.10:443 | g.bing.com | tcp |
| N/A | 10.127.1.2:1604 | tcp | |
| US | 8.8.8.8:53 | 10.27.171.150.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 58.55.71.13.in-addr.arpa | udp |
| N/A | 10.127.1.2:1604 | tcp | |
| US | 8.8.8.8:53 | 171.39.242.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 197.87.175.4.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 101.11.19.2.in-addr.arpa | udp |
| N/A | 10.127.1.2:1604 | tcp | |
| US | 8.8.8.8:53 | 210.108.222.173.in-addr.arpa | udp |
| N/A | 10.127.1.2:1604 | tcp | |
| US | 8.8.8.8:53 | 29.243.111.52.in-addr.arpa | udp |
| N/A | 10.127.1.2:1604 | tcp | |
| US | 8.8.8.8:53 | tse1.mm.bing.net | udp |
| US | 150.171.28.10:443 | tse1.mm.bing.net | tcp |
| US | 150.171.28.10:443 | tse1.mm.bing.net | tcp |
| US | 150.171.28.10:443 | tse1.mm.bing.net | tcp |
| US | 150.171.28.10:443 | tse1.mm.bing.net | tcp |
| US | 150.171.28.10:443 | tse1.mm.bing.net | tcp |
| N/A | 10.127.1.2:1604 | tcp | |
| US | 8.8.8.8:53 | 43.58.199.20.in-addr.arpa | udp |
Files
memory/3528-0-0x00007FFA102C3000-0x00007FFA102C5000-memory.dmp
memory/3528-1-0x00000000001F0000-0x0000000000514000-memory.dmp
memory/3528-2-0x00007FFA102C0000-0x00007FFA10D81000-memory.dmp
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
| MD5 | dca77ba52c9e20bdb3fcb81657918f89 |
| SHA1 | 7cec39d83783008bb9a151b2a71dbc1eb03a7bbf |
| SHA256 | fc564833b7c6fc4e991eb80e075d1c36306b9828172609ad311216ec5fc647f4 |
| SHA512 | 30fe235a26fe74a1fe27caafe059ee5463790252b046a5e467a0d938f1b77a05c0850a37883066a0d4c7bbd11f1bf36bf7a35e4ef3da86d4f7b2c240f2d8929a |
memory/528-8-0x00007FFA102C0000-0x00007FFA10D81000-memory.dmp
memory/3528-9-0x00007FFA102C0000-0x00007FFA10D81000-memory.dmp
memory/528-10-0x00007FFA102C0000-0x00007FFA10D81000-memory.dmp
memory/528-11-0x000000001C680000-0x000000001C6D0000-memory.dmp
memory/528-12-0x000000001C790000-0x000000001C842000-memory.dmp
memory/528-13-0x00007FFA102C0000-0x00007FFA10D81000-memory.dmp