Analysis Overview
SHA256
b2ebc3a634719e1727dcae13f9a4f5df3d89b89718cfd0b2886a971a08b55e77
Threat Level: Known bad
The file Client-abuilt.exe was found to be: Known bad.
Malicious Activity Summary
Quasar RAT
Quasar payload
Quasar family
Executes dropped EXE
Drops file in System32 directory
Unsigned PE
Creates scheduled task(s)
Suspicious use of AdjustPrivilegeToken
Suspicious use of WriteProcessMemory
Suspicious use of SetWindowsHookEx
Uses Task Scheduler COM API
MITRE ATT&CK
Enterprise Matrix V15
Analysis: static1
Detonation Overview
Reported
2024-03-30 03:20
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
2024-03-30 03:20
Reported
2024-03-30 03:22
Platform
win7-20240221-en
Max time kernel
130s
Max time network
144s
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 |
Executes dropped EXE
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windows\system32\SubDir\Client.exe | N/A |
Drops file in System32 directory
| Description | Indicator | Process | Target |
| File opened for modification | C:\Windows\system32\SubDir | C:\Users\Admin\AppData\Local\Temp\Client-abuilt.exe | N/A |
| File opened for modification | C:\Windows\system32\SubDir\Client.exe | C:\Windows\system32\SubDir\Client.exe | N/A |
| File opened for modification | C:\Windows\system32\SubDir | C:\Windows\system32\SubDir\Client.exe | N/A |
| File created | C:\Windows\system32\SubDir\Client.exe | C:\Users\Admin\AppData\Local\Temp\Client-abuilt.exe | N/A |
| File opened for modification | C:\Windows\system32\SubDir\Client.exe | C:\Users\Admin\AppData\Local\Temp\Client-abuilt.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-abuilt.exe | N/A |
| Token: SeDebugPrivilege | N/A | C:\Windows\system32\SubDir\Client.exe | N/A |
Suspicious use of SetWindowsHookEx
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windows\system32\SubDir\Client.exe | N/A |
Suspicious use of WriteProcessMemory
Uses Task Scheduler COM API
Processes
C:\Users\Admin\AppData\Local\Temp\Client-abuilt.exe
"C:\Users\Admin\AppData\Local\Temp\Client-abuilt.exe"
C:\Windows\system32\schtasks.exe
"schtasks" /create /tn "Client Startup" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f
C:\Windows\system32\SubDir\Client.exe
"C:\Windows\system32\SubDir\Client.exe"
C:\Windows\system32\schtasks.exe
"schtasks" /create /tn "Client Startup" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f
Network
| Country | Destination | Domain | Proto |
| US | 198.7.62.204:4782 | tcp | |
| N/A | 192.168.1.1:4782 | tcp | |
| US | 198.7.62.204:4782 | tcp | |
| N/A | 192.168.1.1:4782 | tcp | |
| US | 198.7.62.204:4782 | tcp | |
| N/A | 192.168.1.1:4782 | tcp |
Files
memory/2660-0-0x0000000000360000-0x00000000006A8000-memory.dmp
memory/2660-1-0x000007FEF5810000-0x000007FEF61FC000-memory.dmp
memory/2660-2-0x000000001B2E0000-0x000000001B360000-memory.dmp
C:\Windows\System32\SubDir\Client.exe
| MD5 | fe6bb1f615029c7e339444cbc41706bb |
| SHA1 | cabd13e4e04ef81687812f8680e55e048ee75bd7 |
| SHA256 | b2ebc3a634719e1727dcae13f9a4f5df3d89b89718cfd0b2886a971a08b55e77 |
| SHA512 | 90b15572b73bb065f8cc38a2ca1dbe8ee73991c3693c49f96cda8652d89b010199f4f152b53ae5a7de1a3b13877d301f724ff454e9187950053f7735849e7e82 |
memory/2680-8-0x000007FEF5810000-0x000007FEF61FC000-memory.dmp
memory/2680-9-0x0000000000CE0000-0x0000000001028000-memory.dmp
memory/2680-10-0x000000001B4A0000-0x000000001B520000-memory.dmp
memory/2660-11-0x000007FEF5810000-0x000007FEF61FC000-memory.dmp
memory/2680-12-0x000007FEF5810000-0x000007FEF61FC000-memory.dmp
memory/2680-13-0x000000001B4A0000-0x000000001B520000-memory.dmp
Analysis: behavioral2
Detonation Overview
Submitted
2024-03-30 03:20
Reported
2024-03-30 03:22
Platform
win10v2004-20240226-en
Max time kernel
144s
Max time network
155s
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:\Windows\system32\SubDir\Client.exe | N/A |
Drops file in System32 directory
| Description | Indicator | Process | Target |
| File created | C:\Windows\system32\SubDir\Client.exe | C:\Users\Admin\AppData\Local\Temp\Client-abuilt.exe | N/A |
| File opened for modification | C:\Windows\system32\SubDir\Client.exe | C:\Users\Admin\AppData\Local\Temp\Client-abuilt.exe | N/A |
| File opened for modification | C:\Windows\system32\SubDir | C:\Users\Admin\AppData\Local\Temp\Client-abuilt.exe | N/A |
| File opened for modification | C:\Windows\system32\SubDir\Client.exe | C:\Windows\system32\SubDir\Client.exe | N/A |
| File opened for modification | C:\Windows\system32\SubDir | C:\Windows\system32\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-abuilt.exe | N/A |
| Token: SeDebugPrivilege | N/A | C:\Windows\system32\SubDir\Client.exe | N/A |
Suspicious use of SetWindowsHookEx
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windows\system32\SubDir\Client.exe | N/A |
Suspicious use of WriteProcessMemory
| Description | Indicator | Process | Target |
| PID 4380 wrote to memory of 1432 | N/A | C:\Users\Admin\AppData\Local\Temp\Client-abuilt.exe | C:\Windows\SYSTEM32\schtasks.exe |
| PID 4380 wrote to memory of 1432 | N/A | C:\Users\Admin\AppData\Local\Temp\Client-abuilt.exe | C:\Windows\SYSTEM32\schtasks.exe |
| PID 4380 wrote to memory of 4084 | N/A | C:\Users\Admin\AppData\Local\Temp\Client-abuilt.exe | C:\Windows\system32\SubDir\Client.exe |
| PID 4380 wrote to memory of 4084 | N/A | C:\Users\Admin\AppData\Local\Temp\Client-abuilt.exe | C:\Windows\system32\SubDir\Client.exe |
| PID 4084 wrote to memory of 2940 | N/A | C:\Windows\system32\SubDir\Client.exe | C:\Windows\SYSTEM32\schtasks.exe |
| PID 4084 wrote to memory of 2940 | N/A | C:\Windows\system32\SubDir\Client.exe | C:\Windows\SYSTEM32\schtasks.exe |
Uses Task Scheduler COM API
Processes
C:\Users\Admin\AppData\Local\Temp\Client-abuilt.exe
"C:\Users\Admin\AppData\Local\Temp\Client-abuilt.exe"
C:\Windows\SYSTEM32\schtasks.exe
"schtasks" /create /tn "Client Startup" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f
C:\Windows\system32\SubDir\Client.exe
"C:\Windows\system32\SubDir\Client.exe"
C:\Windows\SYSTEM32\schtasks.exe
"schtasks" /create /tn "Client Startup" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f
C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
"C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --no-appcompat-clear --mojo-platform-channel-handle=3696 --field-trial-handle=3192,i,2785050981002401924,4037047756083432660,262144 --variations-seed-version /prefetch:8
Network
| Country | Destination | Domain | Proto |
| US | 8.8.8.8:53 | 232.168.11.51.in-addr.arpa | udp |
| US | 198.7.62.204:4782 | tcp | |
| US | 8.8.8.8:53 | 0.159.190.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 240.221.184.93.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 152.33.115.104.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 95.221.229.192.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 157.123.68.40.in-addr.arpa | udp |
| US | 13.107.253.64:443 | tcp | |
| N/A | 192.168.1.1:4782 | tcp | |
| US | 198.7.62.204:4782 | tcp | |
| US | 8.8.8.8:53 | 11.227.111.52.in-addr.arpa | udp |
| N/A | 192.168.1.1:4782 | tcp | |
| US | 8.8.8.8:53 | 157.123.68.40.in-addr.arpa | udp |
| US | 198.7.62.204:4782 | tcp | |
| US | 8.8.8.8:53 | 149.220.183.52.in-addr.arpa | udp |
| N/A | 192.168.1.1:4782 | tcp | |
| US | 8.8.8.8:53 | 26.178.89.13.in-addr.arpa | udp |
Files
memory/4380-0-0x0000000000010000-0x0000000000358000-memory.dmp
memory/4380-1-0x00007FFED71B0000-0x00007FFED7C71000-memory.dmp
memory/4380-2-0x000000001AF40000-0x000000001AF50000-memory.dmp
C:\Windows\System32\SubDir\Client.exe
| MD5 | fe6bb1f615029c7e339444cbc41706bb |
| SHA1 | cabd13e4e04ef81687812f8680e55e048ee75bd7 |
| SHA256 | b2ebc3a634719e1727dcae13f9a4f5df3d89b89718cfd0b2886a971a08b55e77 |
| SHA512 | 90b15572b73bb065f8cc38a2ca1dbe8ee73991c3693c49f96cda8652d89b010199f4f152b53ae5a7de1a3b13877d301f724ff454e9187950053f7735849e7e82 |
memory/4084-9-0x00007FFED71B0000-0x00007FFED7C71000-memory.dmp
memory/4084-10-0x000000001B400000-0x000000001B410000-memory.dmp
memory/4380-11-0x00007FFED71B0000-0x00007FFED7C71000-memory.dmp
memory/4084-12-0x000000001C0A0000-0x000000001C0F0000-memory.dmp
memory/4084-13-0x000000001C1B0000-0x000000001C262000-memory.dmp
memory/4084-14-0x00007FFED71B0000-0x00007FFED7C71000-memory.dmp
memory/4084-15-0x000000001B400000-0x000000001B410000-memory.dmp