Analysis
- max time kernel
149s - max time network
153s - platform
windows10-2004_x64 - resource
win10v2004-20231215-en - resource tags
- submitted
04/02/2024, 22:42
General
- Target Client-built.exe
- Size 3.1MB
- Sample240204-2myxyscec8
- SHA256 c9e67efac82588abc854006e4f68a7e9121b63b0dbd8535f28893bc05e3c9861
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
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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 System32 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-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 "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
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- 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
Client.exe
memory/1328-0-0x0000000000F80000-0x00000000012A4000-memory.dmp
memory/1328-1-0x00007FF97DBA0000-0x00007FF97E661000-memory.dmp
memory/1328-2-0x0000000003310000-0x0000000003320000-memory.dmp
memory/1328-10-0x00007FF97DBA0000-0x00007FF97E661000-memory.dmp
memory/1416-9-0x00007FF97DBA0000-0x00007FF97E661000-memory.dmp
memory/1416-11-0x000000001BF40000-0x000000001BF50000-memory.dmp
memory/1416-12-0x000000001BEC0000-0x000000001BF10000-memory.dmp
memory/1416-13-0x000000001C400000-0x000000001C4B2000-memory.dmp
memory/1416-14-0x00007FF97DBA0000-0x00007FF97E661000-memory.dmp
memory/1416-15-0x000000001BF40000-0x000000001BF50000-memory.dmp