Analysis
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max time kernel
149s -
max time network
157s -
platform
windows10-2004_x64 -
resource
win10v2004-20240508-en -
resource tags
arch:x64arch:x86image:win10v2004-20240508-enlocale:en-usos:windows10-2004-x64system -
submitted
30-06-2024 16:46
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
4f56c5c10fd6d558874a09e5d4dbdffd
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SHA1
5b9692b0cfc0da65752a7c6e98528a49ef1b17b9
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SHA256
0a1af9ad6684d877f7c58b00bec90875ccfd709f547fe396a87a9c26e881977b
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SHA512
699ff682370ee44a41af76686435f41682910d1291fbe159570f51e1aed05331dfce20074b3d5cd5937dfe6a8db651f8a4f320b4bf2fe2f38d585b8d4b95c8b4
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SSDEEP
49152:GvnI22SsaNYfdPBldt698dBcjHnKmmmmzzRoGdJCTHHB72eh2NT:GvI22SsaNYfdPBldt6+dBcjHKmmh
Malware Config
Extracted
quasar
1.4.1
Office04
86.137.1.84:4782
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/3488-1-0x0000000000B90000-0x0000000000EB4000-memory.dmp family_quasar C:\Users\Admin\AppData\Roaming\SubDir\Client.exe family_quasar -
Executes dropped EXE 1 IoCs
Processes:
Client.exepid process 2808 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 4856 schtasks.exe 3196 schtasks.exe -
Suspicious use of AdjustPrivilegeToken 2 IoCs
Processes:
Client-built.exeClient.exedescription pid process Token: SeDebugPrivilege 3488 Client-built.exe Token: SeDebugPrivilege 2808 Client.exe -
Suspicious use of FindShellTrayWindow 1 IoCs
Processes:
Client.exepid process 2808 Client.exe -
Suspicious use of SendNotifyMessage 1 IoCs
Processes:
Client.exepid process 2808 Client.exe -
Suspicious use of SetWindowsHookEx 1 IoCs
Processes:
Client.exepid process 2808 Client.exe -
Suspicious use of WriteProcessMemory 6 IoCs
Processes:
Client-built.exeClient.exedescription pid process target process PID 3488 wrote to memory of 4856 3488 Client-built.exe schtasks.exe PID 3488 wrote to memory of 4856 3488 Client-built.exe schtasks.exe PID 3488 wrote to memory of 2808 3488 Client-built.exe Client.exe PID 3488 wrote to memory of 2808 3488 Client-built.exe Client.exe PID 2808 wrote to memory of 3196 2808 Client.exe schtasks.exe PID 2808 wrote to memory of 3196 2808 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
MD54f56c5c10fd6d558874a09e5d4dbdffd
SHA15b9692b0cfc0da65752a7c6e98528a49ef1b17b9
SHA2560a1af9ad6684d877f7c58b00bec90875ccfd709f547fe396a87a9c26e881977b
SHA512699ff682370ee44a41af76686435f41682910d1291fbe159570f51e1aed05331dfce20074b3d5cd5937dfe6a8db651f8a4f320b4bf2fe2f38d585b8d4b95c8b4
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memory/2808-10-0x00007FFB58520000-0x00007FFB58FE1000-memory.dmpFilesize
10.8MB
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memory/2808-11-0x00007FFB58520000-0x00007FFB58FE1000-memory.dmpFilesize
10.8MB
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memory/2808-12-0x000000001DFA0000-0x000000001DFF0000-memory.dmpFilesize
320KB
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memory/2808-13-0x000000001E0B0000-0x000000001E162000-memory.dmpFilesize
712KB
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memory/2808-14-0x00007FFB58520000-0x00007FFB58FE1000-memory.dmpFilesize
10.8MB
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memory/3488-0-0x00007FFB58523000-0x00007FFB58525000-memory.dmpFilesize
8KB
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memory/3488-1-0x0000000000B90000-0x0000000000EB4000-memory.dmpFilesize
3.1MB
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memory/3488-2-0x00007FFB58520000-0x00007FFB58FE1000-memory.dmpFilesize
10.8MB
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memory/3488-9-0x00007FFB58520000-0x00007FFB58FE1000-memory.dmpFilesize
10.8MB