Analysis
- max time kernel
189s - max time network
203s - platform
windows10-2004_x64 - resource
win10v2004-20231023-en - resource tags
- submitted
04/11/2023, 10:50
General
- Target Client-built.exe
- Size 3.1MB
- Sample231104-mxqa8sae22
- SHA256 62de60b59a7e50201894f528b124dc94c072c9db3904494d194b0c7f8be5a4f7
Score
10/10
Malware Config
Extracted
Family
-
quasar
Version
-
1.4.1
Botnet
-
Office04
C2
-
serverlolxd.ddns.net:4782
Mutex
-
d8c275e5-18fa-4e81-8ec8-a1df4d7051cd
Attributes
-
encryption_key
55134B4B269EA9FF5C0DE96378EBD7CC33C096F6
-
install_name
Client.exe
-
log_directory
Logs
-
reconnect_delay
3000
-
startup_key
Windows Update
-
subdirectory
SubDir
Signatures
- Quasar RAT
Quasar is an open source Remote Access Tool.
- Quasar payload 1 IoCs
- Drops file in System32 directory 2 IoCs
- Creates scheduled task(s) 1 TTPs 1 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
- Suspicious use of AdjustPrivilegeToken 1 IoCs
- Suspicious use of WriteProcessMemory 2 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 "Windows Update" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f2⤵
- Creates scheduled task(s)
-
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
memory/836-0-0x0000000000240000-0x0000000000564000-memory.dmp
memory/836-1-0x00007FF898D80000-0x00007FF899841000-memory.dmp
memory/836-2-0x0000000002730000-0x0000000002740000-memory.dmp
memory/836-3-0x00007FF898D80000-0x00007FF899841000-memory.dmp
memory/836-4-0x0000000002730000-0x0000000002740000-memory.dmp