Analysis
- max time kernel
149s - max time network
147s - platform
windows11-21h2_x64 - resource
win11-20260130-en - resource tags
- submitted
19/04/2026, 13:36
General
- Target Client-built.exe
- Size 3.1MB
- Sample260419-qv95eagy6z
- SHA256 221a49f43f08cefba50cfe0905463bfc33cd991c4274e41104f9dcf47fc823a3
Malware Config
Extracted
-
quasar
-
1.4.1
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Office04
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traveltogether.in.net:443
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sunilmilkcentre.in.net:443
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gujarattour.in.net:443
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bd8d9841-9321-4d03-b7a9-ba6f9c368302
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encryption_key
6036311E00155C31A9D54EA6B1527D8921B0E84A
-
install_name
Client.exe
-
key_salt
bfeb1e56fbcd973bb219022430a57843003d5644d21e62b9d4f180e7e6c33941
-
log_directory
Logs
-
reconnect_delay
3000
-
startup_key
Quasar Client Startup
-
subdirectory
SubDir
Signatures
- Family: Quasar RAT
Quasar is an open source Remote Access Tool.
- Quasar payload 2 IoCs
- Executes dropped EXE 2 IoCs
- Drops file in System32 directory 2 IoCs
- Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
- Scheduled Task/Job: Scheduled Task 1 TTPs 2 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
- Suspicious use of AdjustPrivilegeToken 3 IoCs
- Suspicious use of FindShellTrayWindow 1 IoCs
- Suspicious use of SendNotifyMessage 1 IoCs
- Suspicious use of WriteProcessMemory 3 IoCs
- Uses Task Scheduler COM API 1 TTPs
The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.
Processes
-
C:\Users\Admin\AppData\Local\Temp\Client-built.exe"C:\Users\Admin\AppData\Local\Temp\Client-built.exe"1⤵
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
-
C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f2⤵
- Scheduled Task/Job: Scheduled Task
-
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C:\Windows\system32\SubDir\Client.exe"C:\Windows\system32\SubDir\Client.exe"2⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of FindShellTrayWindow
- Suspicious use of SendNotifyMessage
- Suspicious use of WriteProcessMemory
-
C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f3⤵
- Scheduled Task/Job: Scheduled Task
-
-
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C:\Windows\system32\SubDir\Client.exeC:\Windows\system32\SubDir\Client.exe1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
Network
MITRE ATT&CK Enterprise v16
Replay Monitor
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Downloads
Client.exe
memory/896-12-0x000000001C2F0000-0x000000001C3A2000-memory.dmp
memory/896-16-0x000000001B6D0000-0x000000001B7BA000-memory.dmp
memory/896-18-0x000000001B6C0000-0x000000001B6D0000-memory.dmp
memory/896-17-0x0000000001210000-0x0000000001222000-memory.dmp
memory/896-9-0x000000001B6C0000-0x000000001B6D0000-memory.dmp
memory/896-11-0x000000001C1E0000-0x000000001C230000-memory.dmp
memory/1388-15-0x0000000001040000-0x0000000001052000-memory.dmp
memory/1388-14-0x000000001B3B0000-0x000000001B49A000-memory.dmp
memory/3352-0-0x0000000000EC0000-0x00000000011E4000-memory.dmp
memory/3352-7-0x000000001BD40000-0x000000001BE2A000-memory.dmp
memory/3352-8-0x000000001C270000-0x000000001C282000-memory.dmp
memory/3352-1-0x000000001BE30000-0x000000001BE40000-memory.dmp