Analysis
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max time kernel
1798s -
max time network
1810s -
platform
windows10-1703_x64 -
resource
win10-20240221-en -
resource tags
arch:x64arch:x86image:win10-20240221-enlocale:en-usos:windows10-1703-x64system -
submitted
31/03/2024, 00:37
Behavioral task
behavioral1
Sample
Client-built.exe
Resource
win10-20240221-en
Behavioral task
behavioral2
Sample
Client-built.exe
Resource
win10v2004-20240226-en
General
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Target
Client-built.exe
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Size
3.1MB
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MD5
57045c2bf3377b12aa5abce21cc0a99d
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SHA1
217202ed404f25fc550ad70fd7066b0fe8773ef9
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SHA256
f2e04196e1353ad216e077e0aeb2e1ab8ee93b8b16b205422b4cc6d8adc50cc2
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SHA512
9ab46cc194eeaabb75777457a01328f5a8d2ebf604efba0623575cf25c04e206e416ee72db17e3c92a9d363330f82fa3ce2aac64c2a4a61d4dce34d79b73366e
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SSDEEP
49152:Wv+I22SsaNYfdPBldt698dBcjHukuQPoGdhEQTHHB72eh2NT:Wvz22SsaNYfdPBldt6+dBcjHukuE
Malware Config
Extracted
quasar
1.4.1
Ratted
140.238.91.110:44867
be049c71-d631-4f68-8b3e-8e01081f2340
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encryption_key
AA883CE7347A3543F81EBCDE3BBF3BFC9C60344E
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install_name
WOS64UPD.exe
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log_directory
Windows Update Logs
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reconnect_delay
3000
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startup_key
Windows Updater
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subdirectory
Windows
Signatures
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Quasar payload 2 IoCs
resource yara_rule behavioral1/memory/4584-0-0x0000000000A30000-0x0000000000D54000-memory.dmp family_quasar behavioral1/files/0x000700000001abeb-5.dat family_quasar -
Executes dropped EXE 1 IoCs
pid Process 4600 WOS64UPD.exe -
Creates scheduled task(s) 1 TTPs 2 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
pid Process 4176 schtasks.exe 840 schtasks.exe -
Suspicious use of AdjustPrivilegeToken 2 IoCs
description pid Process Token: SeDebugPrivilege 4584 Client-built.exe Token: SeDebugPrivilege 4600 WOS64UPD.exe -
Suspicious use of SetWindowsHookEx 1 IoCs
pid Process 4600 WOS64UPD.exe -
Suspicious use of WriteProcessMemory 6 IoCs
description pid Process procid_target PID 4584 wrote to memory of 4176 4584 Client-built.exe 73 PID 4584 wrote to memory of 4176 4584 Client-built.exe 73 PID 4584 wrote to memory of 4600 4584 Client-built.exe 75 PID 4584 wrote to memory of 4600 4584 Client-built.exe 75 PID 4600 wrote to memory of 840 4600 WOS64UPD.exe 76 PID 4600 wrote to memory of 840 4600 WOS64UPD.exe 76 -
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
PID:4584 -
C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "Windows Updater" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\Windows\WOS64UPD.exe" /rl HIGHEST /f2⤵
- Creates scheduled task(s)
PID:4176
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C:\Users\Admin\AppData\Roaming\Windows\WOS64UPD.exe"C:\Users\Admin\AppData\Roaming\Windows\WOS64UPD.exe"2⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:4600 -
C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "Windows Updater" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\Windows\WOS64UPD.exe" /rl HIGHEST /f3⤵
- Creates scheduled task(s)
PID:840
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Network
MITRE ATT&CK Enterprise v15
Replay Monitor
Loading Replay Monitor...
Downloads
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Filesize
3.1MB
MD557045c2bf3377b12aa5abce21cc0a99d
SHA1217202ed404f25fc550ad70fd7066b0fe8773ef9
SHA256f2e04196e1353ad216e077e0aeb2e1ab8ee93b8b16b205422b4cc6d8adc50cc2
SHA5129ab46cc194eeaabb75777457a01328f5a8d2ebf604efba0623575cf25c04e206e416ee72db17e3c92a9d363330f82fa3ce2aac64c2a4a61d4dce34d79b73366e