Analysis
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max time kernel
148s -
max time network
152s -
platform
windows10-2004_x64 -
resource
win10v2004-20240611-en -
resource tags
arch:x64arch:x86image:win10v2004-20240611-enlocale:en-usos:windows10-2004-x64system -
submitted
30-06-2024 16:15
Behavioral task
behavioral1
Sample
Client-built.exe
Resource
win7-20240611-en
General
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Target
Client-built.exe
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Size
3.1MB
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MD5
acae78b76f4b990b86e2d2d5edfbb6fe
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SHA1
0407bc802c64787ffd2baf35f6ef6c186e88d1dc
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SHA256
afaf1fafdbbd222021f2d6dc870e4026866a2be055654207be312d6d9cbf3bf4
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SHA512
8ff3124fa36c76ee7da622cf6faa6e992369dd6211e9808896afb32b677dadbbf65ed36748c8b7edfd0d01a706b3e38e293053f10e2d983017061f82fc426ee3
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SSDEEP
49152:SvnI22SsaNYfdPBldt698dBcjHBuRJ6dbR3LoGdKITHHB72eh2NT:SvI22SsaNYfdPBldt6+dBcjHBuRJ6v6
Malware Config
Extracted
quasar
1.4.1
Office04
192.168.1.150:4782
adc301f6-35ca-4636-b286-ad2aef63f877
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encryption_key
54B7AB1A151267275EF24D335CE7E3B6ABDDC53E
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install_name
Client.exe
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log_directory
Logs
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reconnect_delay
3000
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startup_key
Microsoft Launcher Task Manager
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subdirectory
SubDir
Signatures
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Quasar payload 2 IoCs
Processes:
resource yara_rule behavioral2/memory/4036-1-0x0000000000FB0000-0x00000000012D4000-memory.dmp family_quasar C:\Users\Admin\AppData\Roaming\SubDir\Client.exe family_quasar -
Executes dropped EXE 1 IoCs
Processes:
Client.exepid process 4628 Client.exe -
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
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Scheduled Task/Job: Scheduled Task 1 TTPs 2 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
Processes:
schtasks.exeschtasks.exepid process 1540 schtasks.exe 64 schtasks.exe -
Suspicious use of AdjustPrivilegeToken 2 IoCs
Processes:
Client-built.exeClient.exedescription pid process Token: SeDebugPrivilege 4036 Client-built.exe Token: SeDebugPrivilege 4628 Client.exe -
Suspicious use of FindShellTrayWindow 1 IoCs
Processes:
Client.exepid process 4628 Client.exe -
Suspicious use of SendNotifyMessage 1 IoCs
Processes:
Client.exepid process 4628 Client.exe -
Suspicious use of SetWindowsHookEx 1 IoCs
Processes:
Client.exepid process 4628 Client.exe -
Suspicious use of WriteProcessMemory 6 IoCs
Processes:
Client-built.exeClient.exedescription pid process target process PID 4036 wrote to memory of 64 4036 Client-built.exe schtasks.exe PID 4036 wrote to memory of 64 4036 Client-built.exe schtasks.exe PID 4036 wrote to memory of 4628 4036 Client-built.exe Client.exe PID 4036 wrote to memory of 4628 4036 Client-built.exe Client.exe PID 4628 wrote to memory of 1540 4628 Client.exe schtasks.exe PID 4628 wrote to memory of 1540 4628 Client.exe schtasks.exe -
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⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
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C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "Microsoft Launcher Task Manager" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f2⤵
- Scheduled Task/Job: Scheduled Task
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C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"2⤵
- Executes dropped EXE
- 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 "Microsoft Launcher Task Manager" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f3⤵
- Scheduled Task/Job: Scheduled Task
Network
MITRE ATT&CK Matrix ATT&CK v13
Replay Monitor
Loading Replay Monitor...
Downloads
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C:\Users\Admin\AppData\Roaming\SubDir\Client.exeFilesize
3.1MB
MD5acae78b76f4b990b86e2d2d5edfbb6fe
SHA10407bc802c64787ffd2baf35f6ef6c186e88d1dc
SHA256afaf1fafdbbd222021f2d6dc870e4026866a2be055654207be312d6d9cbf3bf4
SHA5128ff3124fa36c76ee7da622cf6faa6e992369dd6211e9808896afb32b677dadbbf65ed36748c8b7edfd0d01a706b3e38e293053f10e2d983017061f82fc426ee3
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memory/4036-0-0x00007FF9F7B53000-0x00007FF9F7B55000-memory.dmpFilesize
8KB
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memory/4036-1-0x0000000000FB0000-0x00000000012D4000-memory.dmpFilesize
3.1MB
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memory/4036-2-0x00007FF9F7B50000-0x00007FF9F8611000-memory.dmpFilesize
10.8MB
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memory/4036-10-0x00007FF9F7B50000-0x00007FF9F8611000-memory.dmpFilesize
10.8MB
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memory/4628-9-0x00007FF9F7B50000-0x00007FF9F8611000-memory.dmpFilesize
10.8MB
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memory/4628-11-0x00007FF9F7B50000-0x00007FF9F8611000-memory.dmpFilesize
10.8MB
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memory/4628-12-0x000000001C050000-0x000000001C0A0000-memory.dmpFilesize
320KB
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memory/4628-13-0x000000001C160000-0x000000001C212000-memory.dmpFilesize
712KB
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memory/4628-14-0x00007FF9F7B50000-0x00007FF9F8611000-memory.dmpFilesize
10.8MB