Analysis
- max time kernel
149s - max time network
142s - platform
windows10-2004_x64 - resource
win10v2004-20231215-en - resource tags
- submitted
07/04/2024, 17:20
General
- Target Client-built.exe
- Size 3.1MB
- Sample240407-vwt7ssaa73
- SHA256 143bbf5bac623e9042c4878583568b9a25688f82771e59c04ad6512fc1cf9941
Malware Config
Extracted
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quasar
-
1.4.1
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Office04
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73.238.161.169:4782
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6f2da1e0-0b1d-4489-8337-4b54f7842996
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encryption_key
C3507C52E0A338AFEFD6D5EFFBE2D0543A9115C7
-
install_name
Client.exe
-
log_directory
Logs
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reconnect_delay
3000
-
startup_key
Quasar Client Startup
-
subdirectory
SubDir
Signatures
- Quasar RAT
Quasar is an open source Remote Access Tool.
- Quasar payload 2 IoCs
- Executes dropped EXE 1 IoCs
- Drops file in System32 directory 5 IoCs
- Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
- 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 FindShellTrayWindow 1 IoCs
- Suspicious use of SendNotifyMessage 1 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
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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
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C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f2⤵
- Creates scheduled task(s)
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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 FindShellTrayWindow
- Suspicious use of SendNotifyMessage
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
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C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f3⤵
- Creates scheduled task(s)
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Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
Client.exe
memory/4192-0-0x0000000000EB0000-0x00000000011D4000-memory.dmp
memory/4192-1-0x00007FFBC4850000-0x00007FFBC5311000-memory.dmp
memory/4192-2-0x000000001BD20000-0x000000001BD30000-memory.dmp
memory/4192-10-0x00007FFBC4850000-0x00007FFBC5311000-memory.dmp
memory/4900-9-0x00007FFBC4850000-0x00007FFBC5311000-memory.dmp
memory/4900-11-0x000000001B390000-0x000000001B3A0000-memory.dmp
memory/4900-12-0x000000001C150000-0x000000001C1A0000-memory.dmp
memory/4900-13-0x000000001C260000-0x000000001C312000-memory.dmp
memory/4900-14-0x00007FFBC4850000-0x00007FFBC5311000-memory.dmp
memory/4900-15-0x000000001B390000-0x000000001B3A0000-memory.dmp