Analysis
- max time kernel
135s - max time network
147s - platform
windows10-2004_x64 - resource
win10v2004-20231215-en - resource tags
- submitted
04/02/2024, 22:43
General
- Target Client-built2.exe
- Size 3.1MB
- Sample240204-2m8gdsedgl
- SHA256 989f8844b3bd86c1fd08d9aca9a1e03a25d3e7182d800ac749bf1b07b5be9e0c
Malware Config
Extracted
-
quasar
-
1.4.1
-
Office04
-
quasar.adminer.eu.org:80
-
c00a57b8-6458-402d-95e1-ebeda04e5125
-
encryption_key
FEBC5C854FD21C7823AA8692AFBDC1DA8AE24AEC
-
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
- 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 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-built2.exe"C:\Users\Admin\AppData\Local\Temp\Client-built2.exe"1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
-
C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f2⤵
- Creates scheduled task(s)
-
-
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"2⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
-
C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\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/1132-9-0x00007FFC8E260000-0x00007FFC8ED21000-memory.dmp
memory/1132-11-0x000000001B8C0000-0x000000001B8D0000-memory.dmp
memory/1132-12-0x000000001B850000-0x000000001B8A0000-memory.dmp
memory/1132-13-0x000000001C290000-0x000000001C342000-memory.dmp
memory/1132-14-0x00007FFC8E260000-0x00007FFC8ED21000-memory.dmp
memory/1132-15-0x000000001B8C0000-0x000000001B8D0000-memory.dmp
memory/4764-0-0x0000000000D40000-0x0000000001064000-memory.dmp
memory/4764-1-0x00007FFC8E260000-0x00007FFC8ED21000-memory.dmp
memory/4764-2-0x000000001BE10000-0x000000001BE20000-memory.dmp
memory/4764-10-0x00007FFC8E260000-0x00007FFC8ED21000-memory.dmp