Analysis
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max time kernel
146s -
max time network
152s -
platform
windows7_x64 -
resource
win7-20230712-en -
resource tags
arch:x64arch:x86image:win7-20230712-enlocale:en-usos:windows7-x64system -
submitted
03-08-2023 17:01
Behavioral task
behavioral1
Sample
ujbhz.exe
Resource
win7-20230712-en
General
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Target
ujbhz.exe
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Size
3.1MB
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MD5
73dcb3b3b59192b45f1975fc7a8e9d08
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SHA1
5fdaa30f92acc816c3b43db076f98c91391a3588
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SHA256
d580d7cf10f4eb1cd8aa0cbf80c30f832a0f052c33cdc3d1cf3710e6b67528a8
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SHA512
adce937291bf7c34e255d4b9785884552828cc07fc00b78842402e72e5addb31f61265c2aec593f5bdc1f041bdafd93758bfbc102c8ab25e4bbc7819c16aacc7
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SSDEEP
49152:zv2I22SsaNYfdPBldt698dBcjHPby3EfsAk/WPPoGdfTHHB72eh2NT:zvb22SsaNYfdPBldt6+dBcjHPby2H
Malware Config
Extracted
quasar
1.4.1
Infected
AmirAmir8565-20409.portmap.host:20409
ff410ede-beff-4970-8e12-7d251057f1fd
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encryption_key
1B172706DED462B59F2A5056AB06A8DD1EE8491B
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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
Realtek Audio
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subdirectory
SubDir
Signatures
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Quasar payload 4 IoCs
Processes:
resource yara_rule behavioral1/memory/1964-54-0x0000000000ED0000-0x00000000011F4000-memory.dmp family_quasar C:\Users\Admin\AppData\Roaming\SubDir\Client.exe family_quasar C:\Users\Admin\AppData\Roaming\SubDir\Client.exe family_quasar behavioral1/memory/1648-63-0x00000000011F0000-0x0000000001514000-memory.dmp family_quasar -
Executes dropped EXE 1 IoCs
Processes:
Client.exepid process 1648 Client.exe -
Creates scheduled task(s) 1 TTPs 2 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
Processes:
schtasks.exeschtasks.exepid process 2652 schtasks.exe 2920 schtasks.exe -
Suspicious use of AdjustPrivilegeToken 2 IoCs
Processes:
ujbhz.exeClient.exedescription pid process Token: SeDebugPrivilege 1964 ujbhz.exe Token: SeDebugPrivilege 1648 Client.exe -
Suspicious use of SetWindowsHookEx 1 IoCs
Processes:
Client.exepid process 1648 Client.exe -
Suspicious use of WriteProcessMemory 9 IoCs
Processes:
ujbhz.exeClient.exedescription pid process target process PID 1964 wrote to memory of 2652 1964 ujbhz.exe schtasks.exe PID 1964 wrote to memory of 2652 1964 ujbhz.exe schtasks.exe PID 1964 wrote to memory of 2652 1964 ujbhz.exe schtasks.exe PID 1964 wrote to memory of 1648 1964 ujbhz.exe Client.exe PID 1964 wrote to memory of 1648 1964 ujbhz.exe Client.exe PID 1964 wrote to memory of 1648 1964 ujbhz.exe Client.exe PID 1648 wrote to memory of 2920 1648 Client.exe schtasks.exe PID 1648 wrote to memory of 2920 1648 Client.exe schtasks.exe PID 1648 wrote to memory of 2920 1648 Client.exe schtasks.exe
Processes
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C:\Users\Admin\AppData\Local\Temp\ujbhz.exe"C:\Users\Admin\AppData\Local\Temp\ujbhz.exe"1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1964 -
C:\Windows\system32\schtasks.exe"schtasks" /create /tn "Realtek Audio" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f2⤵
- Creates scheduled task(s)
PID:2652 -
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:1648 -
C:\Windows\system32\schtasks.exe"schtasks" /create /tn "Realtek Audio" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f3⤵
- Creates scheduled task(s)
PID:2920
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
Loading Replay Monitor...
Downloads
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C:\Users\Admin\AppData\Roaming\SubDir\Client.exeFilesize
3.1MB
MD573dcb3b3b59192b45f1975fc7a8e9d08
SHA15fdaa30f92acc816c3b43db076f98c91391a3588
SHA256d580d7cf10f4eb1cd8aa0cbf80c30f832a0f052c33cdc3d1cf3710e6b67528a8
SHA512adce937291bf7c34e255d4b9785884552828cc07fc00b78842402e72e5addb31f61265c2aec593f5bdc1f041bdafd93758bfbc102c8ab25e4bbc7819c16aacc7
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C:\Users\Admin\AppData\Roaming\SubDir\Client.exeFilesize
3.1MB
MD573dcb3b3b59192b45f1975fc7a8e9d08
SHA15fdaa30f92acc816c3b43db076f98c91391a3588
SHA256d580d7cf10f4eb1cd8aa0cbf80c30f832a0f052c33cdc3d1cf3710e6b67528a8
SHA512adce937291bf7c34e255d4b9785884552828cc07fc00b78842402e72e5addb31f61265c2aec593f5bdc1f041bdafd93758bfbc102c8ab25e4bbc7819c16aacc7
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memory/1648-64-0x000007FEF5130000-0x000007FEF5B1C000-memory.dmpFilesize
9.9MB
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memory/1648-63-0x00000000011F0000-0x0000000001514000-memory.dmpFilesize
3.1MB
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memory/1648-65-0x0000000000430000-0x00000000004B0000-memory.dmpFilesize
512KB
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memory/1648-66-0x000007FEF5130000-0x000007FEF5B1C000-memory.dmpFilesize
9.9MB
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memory/1648-67-0x0000000000430000-0x00000000004B0000-memory.dmpFilesize
512KB
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memory/1964-54-0x0000000000ED0000-0x00000000011F4000-memory.dmpFilesize
3.1MB
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memory/1964-55-0x000007FEF5130000-0x000007FEF5B1C000-memory.dmpFilesize
9.9MB
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memory/1964-56-0x000000001B2C0000-0x000000001B340000-memory.dmpFilesize
512KB
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memory/1964-62-0x000007FEF5130000-0x000007FEF5B1C000-memory.dmpFilesize
9.9MB