Analysis
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max time kernel
150s -
max time network
155s -
platform
windows10-2004_x64 -
resource
win10v2004-20231127-en -
resource tags
arch:x64arch:x86image:win10v2004-20231127-enlocale:en-usos:windows10-2004-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 3 IoCs
resource yara_rule behavioral2/memory/4112-0-0x0000000000D40000-0x0000000001064000-memory.dmp family_quasar behavioral2/files/0x0006000000023224-5.dat family_quasar behavioral2/files/0x0006000000023224-7.dat family_quasar -
Executes dropped EXE 1 IoCs
pid Process 2972 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 3788 schtasks.exe 2152 schtasks.exe -
Suspicious use of AdjustPrivilegeToken 2 IoCs
description pid Process Token: SeDebugPrivilege 4112 client-2.exe Token: SeDebugPrivilege 2972 Client.exe -
Suspicious use of FindShellTrayWindow 1 IoCs
pid Process 2972 Client.exe -
Suspicious use of SendNotifyMessage 1 IoCs
pid Process 2972 Client.exe -
Suspicious use of SetWindowsHookEx 1 IoCs
pid Process 2972 Client.exe -
Suspicious use of WriteProcessMemory 6 IoCs
description pid Process procid_target PID 4112 wrote to memory of 3788 4112 client-2.exe 81 PID 4112 wrote to memory of 3788 4112 client-2.exe 81 PID 4112 wrote to memory of 2972 4112 client-2.exe 82 PID 4112 wrote to memory of 2972 4112 client-2.exe 82 PID 2972 wrote to memory of 2152 2972 Client.exe 83 PID 2972 wrote to memory of 2152 2972 Client.exe 83 -
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:4112 -
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:3788
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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:2972 -
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:2152
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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