Analysis
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max time kernel
101s -
max time network
118s -
platform
windows10-2004_x64 -
resource
win10v2004-20240802-en -
resource tags
arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system -
submitted
04-08-2024 20:22
Behavioral task
behavioral1
Sample
fa3f8212e3f1cf885d35ea36ef891350N.exe
Resource
win7-20240729-en
General
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Target
fa3f8212e3f1cf885d35ea36ef891350N.exe
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Size
3.1MB
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MD5
fa3f8212e3f1cf885d35ea36ef891350
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SHA1
49759e579fffe208716703aed27aa057913a6e08
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SHA256
78d043a6604624a4dbce3e3b284e49a297768218407213f17b5bfce17d97b6d5
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SHA512
98343b8274d5036613f04e17315de729e780f2441ba7be5d9f6bef2f314124c6caf8dd170f1b6479c9ec37225ebf40672f2303bb6814f018683a14a7cc166a0f
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SSDEEP
49152:3vyI22SsaNYfdPBldt698dBcjHjuDkE2HBk/+FxoGdFbTHHB72eh2NT:3vf22SsaNYfdPBldt6+dBcjHjuD+7
Malware Config
Extracted
quasar
1.4.1
Office04
192.168.1.19:4782
5c77ed4c-6371-4d16-85c9-eceeff9626f3
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encryption_key
ED5632772B2E213D31112B5C6006F8881852B4E0
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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
Quasar Client Startup
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subdirectory
SubDir
Signatures
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Quasar payload 2 IoCs
Processes:
resource yara_rule behavioral2/memory/3264-1-0x0000000000170000-0x0000000000494000-memory.dmp family_quasar C:\Users\Admin\AppData\Roaming\SubDir\Client.exe family_quasar -
Executes dropped EXE 1 IoCs
Processes:
Client.exepid process 4148 Client.exe -
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 2352 schtasks.exe 3028 schtasks.exe -
Suspicious use of AdjustPrivilegeToken 2 IoCs
Processes:
fa3f8212e3f1cf885d35ea36ef891350N.exeClient.exedescription pid process Token: SeDebugPrivilege 3264 fa3f8212e3f1cf885d35ea36ef891350N.exe Token: SeDebugPrivilege 4148 Client.exe -
Suspicious use of SetWindowsHookEx 1 IoCs
Processes:
Client.exepid process 4148 Client.exe -
Suspicious use of WriteProcessMemory 6 IoCs
Processes:
fa3f8212e3f1cf885d35ea36ef891350N.exeClient.exedescription pid process target process PID 3264 wrote to memory of 3028 3264 fa3f8212e3f1cf885d35ea36ef891350N.exe schtasks.exe PID 3264 wrote to memory of 3028 3264 fa3f8212e3f1cf885d35ea36ef891350N.exe schtasks.exe PID 3264 wrote to memory of 4148 3264 fa3f8212e3f1cf885d35ea36ef891350N.exe Client.exe PID 3264 wrote to memory of 4148 3264 fa3f8212e3f1cf885d35ea36ef891350N.exe Client.exe PID 4148 wrote to memory of 2352 4148 Client.exe schtasks.exe PID 4148 wrote to memory of 2352 4148 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\fa3f8212e3f1cf885d35ea36ef891350N.exe"C:\Users\Admin\AppData\Local\Temp\fa3f8212e3f1cf885d35ea36ef891350N.exe"1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3264 -
C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f2⤵
- Scheduled Task/Job: Scheduled Task
PID:3028 -
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 SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:4148 -
C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f3⤵
- Scheduled Task/Job: Scheduled Task
PID:2352
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
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Filesize
3.1MB
MD5fa3f8212e3f1cf885d35ea36ef891350
SHA149759e579fffe208716703aed27aa057913a6e08
SHA25678d043a6604624a4dbce3e3b284e49a297768218407213f17b5bfce17d97b6d5
SHA51298343b8274d5036613f04e17315de729e780f2441ba7be5d9f6bef2f314124c6caf8dd170f1b6479c9ec37225ebf40672f2303bb6814f018683a14a7cc166a0f