Analysis
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max time kernel
150s -
max time network
149s -
platform
windows10-2004_x64 -
resource
win10v2004-20230221-en -
resource tags
arch:x64arch:x86image:win10v2004-20230221-enlocale:en-usos:windows10-2004-x64system -
submitted
27-05-2023 13:11
Behavioral task
behavioral1
Sample
a6c317dcb5b9f43c26d53121a696eadb.exe
Resource
win7-20230220-en
General
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Target
a6c317dcb5b9f43c26d53121a696eadb.exe
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Size
3.1MB
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MD5
a6c317dcb5b9f43c26d53121a696eadb
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SHA1
10516eb3ed753b9f224f2170da50cde5f0e32d2c
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SHA256
a7e7d00dbcfded8345042410b362d04338fa33dea700a9cdf18679578f6d51af
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SHA512
5cf4f966dc5b94d35804448dde4600049407884330971e34e9462f044f8bb966035759f3a1d1ddb2796565cfed215b544c5adcdb60a75b4cbd15f9b1b1a4583d
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SSDEEP
49152:bvyI22SsaNYfdPBldt698dBcjHsRu6nBxHOoGdG5MbOTHHB72eh2NT:bvf22SsaNYfdPBldt6+dBcjHf6q
Malware Config
Extracted
quasar
1.4.1
Office04
147.135.165.27:4782
f500aa4e-d127-4766-9ef9-64174e95f29c
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encryption_key
491408BD5297689B51A8088AE3C37B6548A71F50
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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 3 IoCs
Processes:
resource yara_rule behavioral2/memory/2676-133-0x0000000000A10000-0x0000000000D34000-memory.dmp family_quasar C:\Windows\System32\SubDir\Client.exe family_quasar C:\Windows\system32\SubDir\Client.exe family_quasar -
Executes dropped EXE 1 IoCs
Processes:
Client.exepid process 4476 Client.exe -
Drops file in System32 directory 5 IoCs
Processes:
Client.exea6c317dcb5b9f43c26d53121a696eadb.exedescription ioc process File opened for modification C:\Windows\system32\SubDir Client.exe File created C:\Windows\system32\SubDir\Client.exe a6c317dcb5b9f43c26d53121a696eadb.exe File opened for modification C:\Windows\system32\SubDir\Client.exe a6c317dcb5b9f43c26d53121a696eadb.exe File opened for modification C:\Windows\system32\SubDir a6c317dcb5b9f43c26d53121a696eadb.exe File opened for modification C:\Windows\system32\SubDir\Client.exe Client.exe -
Creates scheduled task(s) 1 TTPs 2 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
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Suspicious use of AdjustPrivilegeToken 2 IoCs
Processes:
a6c317dcb5b9f43c26d53121a696eadb.exeClient.exedescription pid process Token: SeDebugPrivilege 2676 a6c317dcb5b9f43c26d53121a696eadb.exe Token: SeDebugPrivilege 4476 Client.exe -
Suspicious use of SetWindowsHookEx 1 IoCs
Processes:
Client.exepid process 4476 Client.exe -
Suspicious use of WriteProcessMemory 6 IoCs
Processes:
a6c317dcb5b9f43c26d53121a696eadb.exeClient.exedescription pid process target process PID 2676 wrote to memory of 2436 2676 a6c317dcb5b9f43c26d53121a696eadb.exe schtasks.exe PID 2676 wrote to memory of 2436 2676 a6c317dcb5b9f43c26d53121a696eadb.exe schtasks.exe PID 2676 wrote to memory of 4476 2676 a6c317dcb5b9f43c26d53121a696eadb.exe Client.exe PID 2676 wrote to memory of 4476 2676 a6c317dcb5b9f43c26d53121a696eadb.exe Client.exe PID 4476 wrote to memory of 640 4476 Client.exe schtasks.exe PID 4476 wrote to memory of 640 4476 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\a6c317dcb5b9f43c26d53121a696eadb.exe"C:\Users\Admin\AppData\Local\Temp\a6c317dcb5b9f43c26d53121a696eadb.exe"1⤵
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
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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)
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C:\Windows\system32\SubDir\Client.exe"C:\Windows\system32\SubDir\Client.exe"2⤵
- Executes dropped EXE
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
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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)
Network
MITRE ATT&CK Matrix ATT&CK v6
Replay Monitor
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Downloads
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C:\Windows\System32\SubDir\Client.exeFilesize
3.1MB
MD5a6c317dcb5b9f43c26d53121a696eadb
SHA110516eb3ed753b9f224f2170da50cde5f0e32d2c
SHA256a7e7d00dbcfded8345042410b362d04338fa33dea700a9cdf18679578f6d51af
SHA5125cf4f966dc5b94d35804448dde4600049407884330971e34e9462f044f8bb966035759f3a1d1ddb2796565cfed215b544c5adcdb60a75b4cbd15f9b1b1a4583d
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C:\Windows\system32\SubDir\Client.exeFilesize
3.1MB
MD5a6c317dcb5b9f43c26d53121a696eadb
SHA110516eb3ed753b9f224f2170da50cde5f0e32d2c
SHA256a7e7d00dbcfded8345042410b362d04338fa33dea700a9cdf18679578f6d51af
SHA5125cf4f966dc5b94d35804448dde4600049407884330971e34e9462f044f8bb966035759f3a1d1ddb2796565cfed215b544c5adcdb60a75b4cbd15f9b1b1a4583d
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memory/2676-133-0x0000000000A10000-0x0000000000D34000-memory.dmpFilesize
3.1MB
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memory/2676-134-0x00000000015A0000-0x00000000015B0000-memory.dmpFilesize
64KB
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memory/4476-141-0x000000001B350000-0x000000001B360000-memory.dmpFilesize
64KB
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memory/4476-142-0x000000001B2F0000-0x000000001B340000-memory.dmpFilesize
320KB
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memory/4476-143-0x000000001BC30000-0x000000001BCE2000-memory.dmpFilesize
712KB
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memory/4476-144-0x000000001B350000-0x000000001B360000-memory.dmpFilesize
64KB