Analysis Overview
SHA256
a5473ea4c4ef75c217e0d252d1c7d235b781a75810b7e731a97ed78b45646840
Threat Level: Known bad
The file Client-built.exe was found to be: Known bad.
Malicious Activity Summary
Quasar payload
Quasar RAT
Quasar family
Executes dropped EXE
Drops file in System32 directory
Enumerates physical storage devices
Unsigned PE
Suspicious use of SetWindowsHookEx
Suspicious use of FindShellTrayWindow
Suspicious use of SendNotifyMessage
Uses Task Scheduler COM API
Creates scheduled task(s)
Runs ping.exe
Suspicious use of AdjustPrivilegeToken
Suspicious use of WriteProcessMemory
MITRE ATT&CK
Enterprise Matrix V15
Analysis: static1
Detonation Overview
Reported
2024-04-19 11:09
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
2024-04-19 11:09
Reported
2024-04-19 11:10
Platform
win7-20240221-en
Max time kernel
15s
Max time network
19s
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\updale.exe | N/A |
Drops file in System32 directory
| Description | Indicator | Process | Target |
| File created | C:\Windows\system32\SubDir\updale.exe | C:\Users\Admin\AppData\Local\Temp\Client-built.exe | N/A |
| File opened for modification | C:\Windows\system32\SubDir\updale.exe | C:\Users\Admin\AppData\Local\Temp\Client-built.exe | N/A |
| File opened for modification | C:\Windows\system32\SubDir | C:\Users\Admin\AppData\Local\Temp\Client-built.exe | N/A |
| File opened for modification | C:\Windows\system32\SubDir\updale.exe | C:\Windows\system32\SubDir\updale.exe | N/A |
| File opened for modification | C:\Windows\system32\SubDir | C:\Windows\system32\SubDir\updale.exe | N/A |
Enumerates physical storage devices
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 |
Runs ping.exe
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windows\system32\PING.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:\Windows\system32\SubDir\updale.exe | N/A |
Suspicious use of FindShellTrayWindow
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windows\system32\SubDir\updale.exe | N/A |
Suspicious use of SendNotifyMessage
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windows\system32\SubDir\updale.exe | N/A |
Suspicious use of SetWindowsHookEx
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windows\system32\SubDir\updale.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 "windows av startup" /sc ONLOGON /tr "C:\Windows\system32\SubDir\updale.exe" /rl HIGHEST /f
C:\Windows\system32\SubDir\updale.exe
"C:\Windows\system32\SubDir\updale.exe"
C:\Windows\system32\schtasks.exe
"schtasks" /create /tn "windows av startup" /sc ONLOGON /tr "C:\Windows\system32\SubDir\updale.exe" /rl HIGHEST /f
C:\Windows\system32\cmd.exe
cmd /c ""C:\Users\Admin\AppData\Local\Temp\pmknLoE48RGB.bat" "
C:\Windows\system32\chcp.com
chcp 65001
C:\Windows\system32\PING.EXE
ping -n 10 localhost
Network
| Country | Destination | Domain | Proto |
| US | 8.8.8.8:53 | funlink.ddns.net | udp |
Files
memory/2240-0-0x0000000000EA0000-0x00000000011C4000-memory.dmp
memory/2240-1-0x000007FEF5700000-0x000007FEF60EC000-memory.dmp
memory/2240-2-0x000000001AD40000-0x000000001ADC0000-memory.dmp
C:\Windows\System32\SubDir\updale.exe
| MD5 | 2c1fba8d6624adf6c582fb2d5fb43b28 |
| SHA1 | bd45ee984e9476d604824f83c6cf6111a9db2467 |
| SHA256 | a5473ea4c4ef75c217e0d252d1c7d235b781a75810b7e731a97ed78b45646840 |
| SHA512 | cc85b5f1c2765c49f34c236634dcbfdfd6cc62e0b954b74c12b0d89dc29044dff88a9840e5c02a39e140564283074c78359dd70dfc7f426daefb75f195f14e19 |
memory/2240-8-0x000007FEF5700000-0x000007FEF60EC000-memory.dmp
memory/2540-10-0x000007FEF5700000-0x000007FEF60EC000-memory.dmp
memory/2540-9-0x0000000000E00000-0x0000000001124000-memory.dmp
C:\Users\Admin\AppData\Local\Temp\pmknLoE48RGB.bat
| MD5 | 9cce0dca1ef1148360b651f825223599 |
| SHA1 | 014b0417c7daa19d4389080d54fe174340a12784 |
| SHA256 | 0a6ad1828f76c970269eef4db6b9d818986290c8bf8e1a551ea4f0f80bb2b725 |
| SHA512 | 079b6727d575cb411489b15de50fbf551aa948794b517e4d8d6aff95ae57dd54bfefb065ad7a6bfa27a64b7c5fd53531bb57a5a0648afd10d014017f7f387b0d |
memory/2540-20-0x000007FEF5700000-0x000007FEF60EC000-memory.dmp
Analysis: behavioral2
Detonation Overview
Submitted
2024-04-19 11:09
Reported
2024-04-19 11:12
Platform
win10v2004-20240226-en
Max time kernel
135s
Max time network
162s
Command Line
Signatures
Quasar RAT
Quasar payload
| Description | Indicator | Process | Target |
| N/A | N/A | N/A | N/A |
Drops file in System32 directory
| Description | Indicator | Process | Target |
| File created | C:\Windows\system32\SubDir\updale.exe | C:\Users\Admin\AppData\Local\Temp\Client-built.exe | N/A |
| File opened for modification | C:\Windows\system32\SubDir\updale.exe | C:\Users\Admin\AppData\Local\Temp\Client-built.exe | N/A |
Creates scheduled task(s)
| Description | Indicator | Process | Target |
| 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 |
Suspicious use of WriteProcessMemory
| Description | Indicator | Process | Target |
| PID 1504 wrote to memory of 1436 | N/A | C:\Users\Admin\AppData\Local\Temp\Client-built.exe | C:\Windows\SYSTEM32\schtasks.exe |
| PID 1504 wrote to memory of 1436 | N/A | C:\Users\Admin\AppData\Local\Temp\Client-built.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:\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=4144 --field-trial-handle=2276,i,11674642242468042059,14711253743544118298,262144 --variations-seed-version /prefetch:8
C:\Windows\SYSTEM32\schtasks.exe
"schtasks" /create /tn "windows av startup" /sc ONLOGON /tr "C:\Windows\system32\SubDir\updale.exe" /rl HIGHEST /f
Network
| Country | Destination | Domain | Proto |
| US | 8.8.8.8:53 | 133.211.185.52.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 82.90.14.23.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 103.169.127.40.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 198.187.3.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 24.139.73.23.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 71.159.190.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 19.229.111.52.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 91.90.14.23.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 183.142.211.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 232.168.11.51.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 171.117.168.52.in-addr.arpa | udp |
Files
memory/1504-0-0x00000000005D0000-0x00000000008F4000-memory.dmp
memory/1504-1-0x00007FFA05EA0000-0x00007FFA06961000-memory.dmp
memory/1504-2-0x000000001B600000-0x000000001B610000-memory.dmp
memory/1504-3-0x00007FFA05EA0000-0x00007FFA06961000-memory.dmp
memory/1504-4-0x000000001B600000-0x000000001B610000-memory.dmp