Analysis
- max time kernel
143s - max time network
150s - platform
windows10-2004_x64 - resource
win10v2004-20231215-en - resource tags
- submitted
04/02/2024, 22:42
General
- Target Client-built1.exe
- Size 3.1MB
- Sample240204-2m6b2aced3
- SHA256 d20d1f2ec5a33581f0a1c63450a570ad89653f5a5dfd5aad6829fa78a2809d04
Malware Config
Extracted
-
quasar
-
1.4.1
-
Office04
-
quasar.adminer.eu.org:80
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c00a57b8-6458-402d-95e1-ebeda04e5125
-
encryption_key
FEBC5C854FD21C7823AA8692AFBDC1DA8AE24AEC
-
install_name
Client.exe
-
log_directory
Logs
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reconnect_delay
3000
-
startup_key
Client Startup
-
subdirectory
SubDir
Signatures
- Quasar RAT
Quasar is an open source Remote Access Tool.
- Quasar payload 3 IoCs
- Executes dropped EXE 1 IoCs
- Drops file in Program Files directory 5 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-built1.exe"C:\Users\Admin\AppData\Local\Temp\Client-built1.exe"1⤵
- Drops file in Program Files directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
-
C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "Client Startup" /sc ONLOGON /tr "C:\Program Files\SubDir\Client.exe" /rl HIGHEST /f2⤵
- Creates scheduled task(s)
-
-
C:\Program Files\SubDir\Client.exe"C:\Program Files\SubDir\Client.exe"2⤵
- Executes dropped EXE
- Drops file in Program Files directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
-
C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "Client Startup" /sc ONLOGON /tr "C:\Program Files\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
Client.exe
memory/3232-0-0x00000000000C0000-0x00000000003E4000-memory.dmp
memory/3232-1-0x00007FF984A60000-0x00007FF985521000-memory.dmp
memory/3232-2-0x000000001B310000-0x000000001B320000-memory.dmp
memory/3232-10-0x00007FF984A60000-0x00007FF985521000-memory.dmp
memory/4696-9-0x00007FF984A60000-0x00007FF985521000-memory.dmp
memory/4696-11-0x000000001B8F0000-0x000000001B900000-memory.dmp
memory/4696-12-0x0000000002B50000-0x0000000002BA0000-memory.dmp
memory/4696-13-0x000000001C610000-0x000000001C6C2000-memory.dmp
memory/4696-14-0x00007FF984A60000-0x00007FF985521000-memory.dmp
memory/4696-15-0x000000001B8F0000-0x000000001B900000-memory.dmp