Analysis
- max time kernel
95s - max time network
97s - platform
windows10-2004_x64 - resource
win10v2004-20240802-en - resource tags
- submitted
05/08/2024, 04:23
General
- Target Client-built.exe
- Size 3.1MB
- Sample240805-e1aqys1arg
- SHA256 01b172d69a0ce6bdf3f29f89b58e18474d07d7c57f22ac4633fdb2cfa794cb6c
Malware Config
Extracted
-
quasar
-
1.4.1
-
Office04
-
147.185.221.20:18563
-
147.185.221.20:9835
-
c2e1b18a-ce93-436d-ad8b-21bf89015e19
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encryption_key
9E968F05BD874BA1BE086FD1774A027473823F49
-
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 1 IoCs
- Checks computer location settings 2 TTPs 1 IoCs
Looks up country code configured in the registry, likely geofence.
- Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
- System Network Configuration Discovery: Internet Connection Discovery 1 TTPs 1 IoCs
Adversaries may check for Internet connectivity on compromised systems.
- Runs ping.exe 1 TTPs 1 IoCs
- Suspicious use of AdjustPrivilegeToken 3 IoCs
- Suspicious use of FindShellTrayWindow 3 IoCs
- Suspicious use of SendNotifyMessage 3 IoCs
- Suspicious use of WriteProcessMemory 6 IoCs
Processes
-
C:\Users\Admin\AppData\Local\Temp\Client-built.exe"C:\Users\Admin\AppData\Local\Temp\Client-built.exe"1⤵
- Checks computer location settings
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of FindShellTrayWindow
- Suspicious use of SendNotifyMessage
- Suspicious use of WriteProcessMemory
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C:\Windows\system32\cmd.exeC:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\KuBhliT3xyl5.bat" "2⤵
- Suspicious use of WriteProcessMemory
-
C:\Windows\system32\chcp.comchcp 650013⤵
-
-
C:\Windows\system32\PING.EXEping -n 10 localhost3⤵
- System Network Configuration Discovery: Internet Connection Discovery
- Runs ping.exe
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-
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C:\Windows\system32\AUDIODG.EXEC:\Windows\system32\AUDIODG.EXE 0x45c 0x48c1⤵
- Suspicious use of AdjustPrivilegeToken
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
KuBhliT3xyl5.bat
memory/4912-0-0x00007FFCBAE03000-0x00007FFCBAE05000-memory.dmp
memory/4912-1-0x0000000000510000-0x0000000000834000-memory.dmp
memory/4912-2-0x00007FFCBAE00000-0x00007FFCBB8C1000-memory.dmp
memory/4912-3-0x000000001BF20000-0x000000001BF70000-memory.dmp
memory/4912-4-0x000000001C030000-0x000000001C0E2000-memory.dmp
memory/4912-5-0x000000001BEF0000-0x000000001BF02000-memory.dmp
memory/4912-6-0x000000001BFB0000-0x000000001BFEC000-memory.dmp
memory/4912-7-0x00007FFCBAE03000-0x00007FFCBAE05000-memory.dmp
memory/4912-8-0x00007FFCBAE00000-0x00007FFCBB8C1000-memory.dmp
memory/4912-9-0x000000001CCE0000-0x000000001CD8A000-memory.dmp
memory/4912-18-0x00007FFCBAE00000-0x00007FFCBB8C1000-memory.dmp