Analysis
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max time kernel
126s -
max time network
142s -
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 12:00
Behavioral task
behavioral1
Sample
qqsarbuilder.exe
Resource
win7-20240704-en
General
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Target
qqsarbuilder.exe
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Size
3.1MB
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MD5
ea1ab6ce5932a3718821475f19feefea
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SHA1
5ab97ce62532976abd93ed2cf56662b8ec15606c
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SHA256
27f1a7bab299f2c36793116723e05be58c6edff36c07ba24a2703903cbdd6048
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SHA512
e66fa91097b2f725503206bd7e92da486ffd17a9c8fab221387c1d3795e59afedae4fb791b9c530e2e25272a642964e63dc15fe081faed29289c332db8523838
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SSDEEP
49152:fvSI22SsaNYfdPBldt698dBcjHvSZxNESEJk/ijLoGdLqiTHHB72eh2NT:fv/22SsaNYfdPBldt6+dBcjHvUxAv7
Malware Config
Extracted
quasar
1.4.1
Office04
192.168.174.129:4782
4642d254-5910-430f-8e8f-b944ab72b6fd
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encryption_key
F0F78B2B4A3D25098C1C1557DC99FDA4D204F27D
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install_name
windwsupdater.exe
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log_directory
Logs
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reconnect_delay
3000
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startup_key
windwsupdater
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subdirectory
SubDir
Signatures
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Quasar payload 2 IoCs
Processes:
resource yara_rule behavioral2/memory/3196-1-0x00000000006C0000-0x00000000009E4000-memory.dmp family_quasar C:\Users\Admin\AppData\Roaming\SubDir\windwsupdater.exe family_quasar -
Executes dropped EXE 1 IoCs
Processes:
windwsupdater.exepid process 2796 windwsupdater.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 4988 schtasks.exe 2808 schtasks.exe -
Suspicious use of AdjustPrivilegeToken 2 IoCs
Processes:
qqsarbuilder.exewindwsupdater.exedescription pid process Token: SeDebugPrivilege 3196 qqsarbuilder.exe Token: SeDebugPrivilege 2796 windwsupdater.exe -
Suspicious use of SetWindowsHookEx 1 IoCs
Processes:
windwsupdater.exepid process 2796 windwsupdater.exe -
Suspicious use of WriteProcessMemory 6 IoCs
Processes:
qqsarbuilder.exewindwsupdater.exedescription pid process target process PID 3196 wrote to memory of 4988 3196 qqsarbuilder.exe schtasks.exe PID 3196 wrote to memory of 4988 3196 qqsarbuilder.exe schtasks.exe PID 3196 wrote to memory of 2796 3196 qqsarbuilder.exe windwsupdater.exe PID 3196 wrote to memory of 2796 3196 qqsarbuilder.exe windwsupdater.exe PID 2796 wrote to memory of 2808 2796 windwsupdater.exe schtasks.exe PID 2796 wrote to memory of 2808 2796 windwsupdater.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\qqsarbuilder.exe"C:\Users\Admin\AppData\Local\Temp\qqsarbuilder.exe"1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3196 -
C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "windwsupdater" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\windwsupdater.exe" /rl HIGHEST /f2⤵
- Scheduled Task/Job: Scheduled Task
PID:4988 -
C:\Users\Admin\AppData\Roaming\SubDir\windwsupdater.exe"C:\Users\Admin\AppData\Roaming\SubDir\windwsupdater.exe"2⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:2796 -
C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "windwsupdater" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\windwsupdater.exe" /rl HIGHEST /f3⤵
- Scheduled Task/Job: Scheduled Task
PID:2808
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
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Filesize
3.1MB
MD5ea1ab6ce5932a3718821475f19feefea
SHA15ab97ce62532976abd93ed2cf56662b8ec15606c
SHA25627f1a7bab299f2c36793116723e05be58c6edff36c07ba24a2703903cbdd6048
SHA512e66fa91097b2f725503206bd7e92da486ffd17a9c8fab221387c1d3795e59afedae4fb791b9c530e2e25272a642964e63dc15fe081faed29289c332db8523838