Analysis
- max time kernel
150s - max time network
140s - platform
windows10-1703_x64 - resource
win10-20240404-en - resource tags
- submitted
19/04/2024, 22:32
General
- Target Client-built.exe
- Size 3.1MB
- Sample240419-2f4jvsab4t
- SHA256 97cd6ad3a56efc266ba1860e2d1c5958094b988be74bd36e9499d22fdaed9c59
Malware Config
Extracted
-
quasar
-
1.4.1
-
Office04
-
192.168.1.139:4782
-
e12e9d8f-f86f-4c20-aaa9-ca4ae3df9435
-
encryption_key
8A5C503C69142D8C1F9A30FB7AA52FB2729B3861
-
install_name
Client.exe
-
log_directory
Logs
-
reconnect_delay
3000
-
startup_key
Client Startup
-
subdirectory
SubDir
Signatures
- Quasar RAT
Quasar is an open source Remote Access Tool.
- Quasar payload 2 IoCs
- Executes dropped EXE 1 IoCs
- Drops file in System32 directory 2 IoCs
- Creates scheduled task(s) 1 TTPs 2 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
- Suspicious use of AdjustPrivilegeToken 2 IoCs
- Suspicious use of SetWindowsHookEx 1 IoCs
- Suspicious use of WriteProcessMemory 6 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
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C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "Client Startup" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f2⤵
- Creates scheduled task(s)
-
-
C:\Windows\system32\SubDir\Client.exe"C:\Windows\system32\SubDir\Client.exe"2⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
-
C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "Client Startup" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f3⤵
- Creates scheduled task(s)
-
-
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
Client.exe
memory/804-9-0x00007FFDDF720000-0x00007FFDE010C000-memory.dmp
memory/804-10-0x000000001BC30000-0x000000001BC40000-memory.dmp
memory/804-11-0x000000001C300000-0x000000001C350000-memory.dmp
memory/804-12-0x000000001C410000-0x000000001C4C2000-memory.dmp
memory/804-13-0x00007FFDDF720000-0x00007FFDE010C000-memory.dmp
memory/804-14-0x000000001BC30000-0x000000001BC40000-memory.dmp
memory/4392-0-0x0000000000350000-0x0000000000674000-memory.dmp
memory/4392-1-0x00007FFDDF720000-0x00007FFDE010C000-memory.dmp
memory/4392-2-0x0000000000F50000-0x0000000000F60000-memory.dmp
memory/4392-8-0x00007FFDDF720000-0x00007FFDE010C000-memory.dmp