Analysis
- max time kernel
138s - max time network
153s - platform
windows10-2004_x64 - resource
win10v2004-20231023-en - resource tags
- submitted
22/11/2023, 16:13
General
- Target Client-built.exe
- Size 3.1MB
- Sample231122-tn393aeb9w
- SHA256 556c3d399ad1ef6fd644197537d517582f64aeb18172ff5095e1e01eb3bf0d9c
Malware Config
Extracted
-
quasar
-
1.4.1
-
Office04
-
myquasarhost.ddns.net:4782
-
4820c051-6f63-4e0a-8e5b-025be7e4893b
-
encryption_key
C8A35AC023CEAD5AB85C1FB6B45B33B43A6B247F
-
install_name
word.exe
-
log_directory
Logs
-
reconnect_delay
3000
-
startup_key
Quasar Client Startup
-
subdirectory
SubDir
Signatures
- Quasar RAT
Quasar is an open source Remote Access Tool.
- Quasar payload 3 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 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⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
-
C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\word.exe" /rl HIGHEST /f2⤵
- Creates scheduled task(s)
-
-
C:\Users\Admin\AppData\Roaming\SubDir\word.exe"C:\Users\Admin\AppData\Roaming\SubDir\word.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 "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\word.exe" /rl HIGHEST /f3⤵
- Creates scheduled task(s)
-
-
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
word.exe
word.exe
memory/1760-0-0x00000000008E0000-0x0000000000C04000-memory.dmp
memory/1760-1-0x00007FF95AAC0000-0x00007FF95B581000-memory.dmp
memory/1760-2-0x000000001B900000-0x000000001B910000-memory.dmp
memory/1760-10-0x00007FF95AAC0000-0x00007FF95B581000-memory.dmp
memory/4084-9-0x00007FF95AAC0000-0x00007FF95B581000-memory.dmp
memory/4084-11-0x000000001BCE0000-0x000000001BCF0000-memory.dmp
memory/4084-12-0x000000001C3E0000-0x000000001C430000-memory.dmp
memory/4084-13-0x000000001C4F0000-0x000000001C5A2000-memory.dmp
memory/4084-14-0x00007FF95AAC0000-0x00007FF95B581000-memory.dmp
memory/4084-15-0x000000001BCE0000-0x000000001BCF0000-memory.dmp