Analysis
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max time kernel
50s -
max time network
138s -
platform
windows10-1703_x64 -
resource
win10-20230220-en -
resource tags
arch:x64arch:x86image:win10-20230220-enlocale:en-usos:windows10-1703-x64system -
submitted
16-05-2023 06:23
General
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Target
d969fc2e15743d6d44f477907368f2ebc96cefba20a232861fc7337bfa938d75.exe
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Size
2.8MB
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MD5
ec4951e9f2b1945815954fec161cf57a
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SHA1
8e9e6857a0251a89b9c43b650344fb4f1648fa76
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SHA256
d969fc2e15743d6d44f477907368f2ebc96cefba20a232861fc7337bfa938d75
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SHA512
596e28d3529be33483589973ac34410f574cd888bda74e1e24afb2a2de107af4e788e2a27648da3c4fe4db4f49184244ce6ccf50f480c95c8d252d541587ad15
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SSDEEP
49152:y/Cbs48/vm/XpRDVHFZuAzG5LfvUza32ehyfT36:y/Ob8/vm/XnDVHbs
Malware Config
Extracted
quasar
1.4.0
X
45.141.27.208:4780
127.0.0.1:4780
d6e77ea9-bff7-4566-b4dd-f1be3c293c5e
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encryption_key
57F667877C1FCDA6663E2FDAC6FB8CFDE3CEA957
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install_name
winx.exe
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log_directory
Logs
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reconnect_delay
3000
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startup_key
winx
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subdirectory
sys
Signatures
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Quasar payload 3 IoCs
Processes:
resource yara_rule behavioral1/memory/2488-121-0x0000000000DA0000-0x000000000106A000-memory.dmp family_quasar C:\Windows\System32\sys\winx.exe family_quasar C:\Windows\system32\sys\winx.exe family_quasar -
Executes dropped EXE 1 IoCs
Processes:
winx.exepid process 3176 winx.exe -
Drops file in System32 directory 5 IoCs
Processes:
d969fc2e15743d6d44f477907368f2ebc96cefba20a232861fc7337bfa938d75.exewinx.exedescription ioc process File opened for modification C:\Windows\system32\sys\winx.exe d969fc2e15743d6d44f477907368f2ebc96cefba20a232861fc7337bfa938d75.exe File opened for modification C:\Windows\system32\sys d969fc2e15743d6d44f477907368f2ebc96cefba20a232861fc7337bfa938d75.exe File opened for modification C:\Windows\system32\sys\winx.exe winx.exe File opened for modification C:\Windows\system32\sys winx.exe File created C:\Windows\system32\sys\winx.exe d969fc2e15743d6d44f477907368f2ebc96cefba20a232861fc7337bfa938d75.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 2544 schtasks.exe 4000 schtasks.exe -
Suspicious use of AdjustPrivilegeToken 2 IoCs
Processes:
d969fc2e15743d6d44f477907368f2ebc96cefba20a232861fc7337bfa938d75.exewinx.exedescription pid process Token: SeDebugPrivilege 2488 d969fc2e15743d6d44f477907368f2ebc96cefba20a232861fc7337bfa938d75.exe Token: SeDebugPrivilege 3176 winx.exe -
Suspicious use of SetWindowsHookEx 1 IoCs
Processes:
winx.exepid process 3176 winx.exe -
Suspicious use of WriteProcessMemory 6 IoCs
Processes:
d969fc2e15743d6d44f477907368f2ebc96cefba20a232861fc7337bfa938d75.exewinx.exedescription pid process target process PID 2488 wrote to memory of 2544 2488 d969fc2e15743d6d44f477907368f2ebc96cefba20a232861fc7337bfa938d75.exe schtasks.exe PID 2488 wrote to memory of 2544 2488 d969fc2e15743d6d44f477907368f2ebc96cefba20a232861fc7337bfa938d75.exe schtasks.exe PID 2488 wrote to memory of 3176 2488 d969fc2e15743d6d44f477907368f2ebc96cefba20a232861fc7337bfa938d75.exe winx.exe PID 2488 wrote to memory of 3176 2488 d969fc2e15743d6d44f477907368f2ebc96cefba20a232861fc7337bfa938d75.exe winx.exe PID 3176 wrote to memory of 4000 3176 winx.exe schtasks.exe PID 3176 wrote to memory of 4000 3176 winx.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\d969fc2e15743d6d44f477907368f2ebc96cefba20a232861fc7337bfa938d75.exe"C:\Users\Admin\AppData\Local\Temp\d969fc2e15743d6d44f477907368f2ebc96cefba20a232861fc7337bfa938d75.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 "winx" /sc ONLOGON /tr "C:\Windows\system32\sys\winx.exe" /rl HIGHEST /f2⤵
- Creates scheduled task(s)
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C:\Windows\system32\sys\winx.exe"C:\Windows\system32\sys\winx.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 "winx" /sc ONLOGON /tr "C:\Windows\system32\sys\winx.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\sys\winx.exeFilesize
2.8MB
MD5ec4951e9f2b1945815954fec161cf57a
SHA18e9e6857a0251a89b9c43b650344fb4f1648fa76
SHA256d969fc2e15743d6d44f477907368f2ebc96cefba20a232861fc7337bfa938d75
SHA512596e28d3529be33483589973ac34410f574cd888bda74e1e24afb2a2de107af4e788e2a27648da3c4fe4db4f49184244ce6ccf50f480c95c8d252d541587ad15
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C:\Windows\system32\sys\winx.exeFilesize
2.8MB
MD5ec4951e9f2b1945815954fec161cf57a
SHA18e9e6857a0251a89b9c43b650344fb4f1648fa76
SHA256d969fc2e15743d6d44f477907368f2ebc96cefba20a232861fc7337bfa938d75
SHA512596e28d3529be33483589973ac34410f574cd888bda74e1e24afb2a2de107af4e788e2a27648da3c4fe4db4f49184244ce6ccf50f480c95c8d252d541587ad15
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memory/2488-121-0x0000000000DA0000-0x000000000106A000-memory.dmpFilesize
2.8MB
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memory/2488-122-0x0000000001930000-0x0000000001940000-memory.dmpFilesize
64KB
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memory/3176-129-0x0000000001730000-0x0000000001740000-memory.dmpFilesize
64KB
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memory/3176-130-0x00000000030E0000-0x0000000003130000-memory.dmpFilesize
320KB
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memory/3176-131-0x000000001C4A0000-0x000000001C552000-memory.dmpFilesize
712KB
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memory/3176-134-0x000000001BA60000-0x000000001BA72000-memory.dmpFilesize
72KB
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memory/3176-135-0x000000001BAC0000-0x000000001BAFE000-memory.dmpFilesize
248KB
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memory/3176-136-0x0000000001730000-0x0000000001740000-memory.dmpFilesize
64KB