Analysis
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max time kernel
117s -
max time network
121s -
platform
windows7_x64 -
resource
win7-20231023-en -
resource tags
arch:x64arch:x86image:win7-20231023-enlocale:en-usos:windows7-x64system -
submitted
01-12-2023 10:30
Behavioral task
behavioral1
Sample
client-2.exe
Resource
win7-20231023-en
General
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Target
client-2.exe
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Size
3.1MB
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MD5
cac610eeae60d8291a852ad9dda90c81
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SHA1
d97afeabdc465c60ba040becfbc5abde19ec9326
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SHA256
7fbdff8ee9930b76ae1ca9310f493ae700e1f7c9aa1b32c47fca64a240317ed4
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SHA512
887edd3ac530c3014aea7d8aab97756aabf250c5cecf01c837a19787403ca6dcb0ed1e84a6842af69c4418e14e7bd9327762db228344229df24ff536ae81d2e5
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SSDEEP
49152:uvct62XlaSFNWPjljiFa2RoUYIy6RJ6LbR3LoGduTHHB72eh2NT:uvg62XlaSFNWPjljiFXRoUYIy6RJ6d
Malware Config
Extracted
quasar
1.4.1
Office04
127.0.0.1:7777
e74501e4-0d13-44ea-ab56-f5adb400d53b
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encryption_key
122EFF89481AC09109CB9613ECDFDD3EE770EBD3
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install_name
Client.exe
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log_directory
Logs
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reconnect_delay
300000
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startup_key
Quasar Client Startup
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subdirectory
SubDir
Signatures
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Quasar payload 4 IoCs
resource yara_rule behavioral1/memory/2696-0-0x0000000001250000-0x0000000001574000-memory.dmp family_quasar behavioral1/files/0x000c0000000122d9-5.dat family_quasar behavioral1/files/0x000c0000000122d9-6.dat family_quasar behavioral1/memory/2728-9-0x00000000003B0000-0x00000000006D4000-memory.dmp family_quasar -
Executes dropped EXE 1 IoCs
pid Process 2728 Client.exe -
Drops file in System32 directory 2 IoCs
description ioc Process File created C:\Windows\system32\SubDir\Client.exe client-2.exe File opened for modification C:\Windows\system32\SubDir\Client.exe client-2.exe -
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
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Creates scheduled task(s) 1 TTPs 2 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
pid Process 2624 schtasks.exe 2432 schtasks.exe -
Suspicious use of AdjustPrivilegeToken 2 IoCs
description pid Process Token: SeDebugPrivilege 2696 client-2.exe Token: SeDebugPrivilege 2728 Client.exe -
Suspicious use of FindShellTrayWindow 1 IoCs
pid Process 2728 Client.exe -
Suspicious use of SendNotifyMessage 1 IoCs
pid Process 2728 Client.exe -
Suspicious use of SetWindowsHookEx 1 IoCs
pid Process 2728 Client.exe -
Suspicious use of WriteProcessMemory 9 IoCs
description pid Process procid_target PID 2696 wrote to memory of 2624 2696 client-2.exe 28 PID 2696 wrote to memory of 2624 2696 client-2.exe 28 PID 2696 wrote to memory of 2624 2696 client-2.exe 28 PID 2696 wrote to memory of 2728 2696 client-2.exe 30 PID 2696 wrote to memory of 2728 2696 client-2.exe 30 PID 2696 wrote to memory of 2728 2696 client-2.exe 30 PID 2728 wrote to memory of 2432 2728 Client.exe 31 PID 2728 wrote to memory of 2432 2728 Client.exe 31 PID 2728 wrote to memory of 2432 2728 Client.exe 31 -
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-2.exe"C:\Users\Admin\AppData\Local\Temp\client-2.exe"1⤵
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2696 -
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)
PID:2624
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C:\Windows\system32\SubDir\Client.exe"C:\Windows\system32\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
PID:2728 -
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)
PID:2432
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Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
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Filesize
3.1MB
MD5cac610eeae60d8291a852ad9dda90c81
SHA1d97afeabdc465c60ba040becfbc5abde19ec9326
SHA2567fbdff8ee9930b76ae1ca9310f493ae700e1f7c9aa1b32c47fca64a240317ed4
SHA512887edd3ac530c3014aea7d8aab97756aabf250c5cecf01c837a19787403ca6dcb0ed1e84a6842af69c4418e14e7bd9327762db228344229df24ff536ae81d2e5
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Filesize
3.1MB
MD5cac610eeae60d8291a852ad9dda90c81
SHA1d97afeabdc465c60ba040becfbc5abde19ec9326
SHA2567fbdff8ee9930b76ae1ca9310f493ae700e1f7c9aa1b32c47fca64a240317ed4
SHA512887edd3ac530c3014aea7d8aab97756aabf250c5cecf01c837a19787403ca6dcb0ed1e84a6842af69c4418e14e7bd9327762db228344229df24ff536ae81d2e5