Analysis
- max time kernel
139s - max time network
144s - platform
windows10-2004_x64 - resource
win10v2004-20230220-en - resource tags
- submitted
06/06/2023, 15:10
General
- Target 333.exe
- Size 3.1MB
- Sample230606-sj38tsec22
- SHA256 d465ae9ae6e31167882d3b174e65fb3147ead1574d6cade606a3aa4ae0c5545c
Malware Config
Extracted
-
quasar
-
1.4.1
-
Office04
-
146.56.36.222:4782
-
bab74252-734a-4e03-933a-2f4f1e18953d
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encryption_key
F48794CF898BB4C5B6223D4F472D7C5E4AD2EF9D
-
install_name
yu.exe
-
log_directory
Logs
-
reconnect_delay
3000
-
startup_key
zhudongfangyu
-
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\333.exe"C:\Users\Admin\AppData\Local\Temp\333.exe"1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
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C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "zhudongfangyu" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\yu.exe" /rl HIGHEST /f2⤵
- Creates scheduled task(s)
-
-
C:\Users\Admin\AppData\Roaming\SubDir\yu.exe"C:\Users\Admin\AppData\Roaming\SubDir\yu.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 "zhudongfangyu" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\yu.exe" /rl HIGHEST /f3⤵
- Creates scheduled task(s)
-
-
Network
MITRE ATT&CK Enterprise v6
Replay Monitor
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Downloads
yu.exe
yu.exe
memory/1020-141-0x000000001B290000-0x000000001B2A0000-memory.dmp
memory/1020-142-0x000000001BA00000-0x000000001BA50000-memory.dmp
memory/1020-143-0x000000001BB10000-0x000000001BBC2000-memory.dmp
memory/1020-144-0x000000001B2E0000-0x000000001B2F2000-memory.dmp
memory/1020-145-0x000000001BA90000-0x000000001BACC000-memory.dmp
memory/1020-146-0x000000001B290000-0x000000001B2A0000-memory.dmp
memory/2084-133-0x0000000000430000-0x0000000000754000-memory.dmp
memory/2084-134-0x000000001B2D0000-0x000000001B2E0000-memory.dmp