Analysis
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max time kernel
75s -
max time network
79s -
platform
windows7_x64 -
resource
win7-20240508-en -
resource tags
arch:x64arch:x86image:win7-20240508-enlocale:en-usos:windows7-x64system -
submitted
30-06-2024 13:13
Behavioral task
behavioral1
Sample
Client-built.exe
Resource
win7-20240508-en
General
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Target
Client-built.exe
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Size
3.1MB
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MD5
1e48869d1ce254c1aba0e61aedcdba8e
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SHA1
cf79b1e78d9e1616208e653c4df4eef3b9f7360b
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SHA256
ca182b6ce56a01a69122b24469fe5ad78e0cda78caeb49e5a814e2ac5774a10a
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SHA512
fc6469a2297258cd9723f2d6c795e78c5b065ed709384bb18fe0fb8255cb2760e0633ec2683652ef88abd87ac21ef1d31eee3fd35e64f464d4da0c205fdcb343
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SSDEEP
49152:7vilL26AaNeWgPhlmVqvMQ7XSKeQ03far7ToGddTHHB72eh2NT:7vaL26AaNeWgPhlmVqkQ7XSKu3Y
Malware Config
Extracted
quasar
1.4.1
Office04
192.168.1.150:4782
4fa54cdc-4bee-4759-b0fd-21bb6d6f9eed
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encryption_key
99A3D9CE1DE6501187FC4C0E50EBB3FE8AD7B9A8
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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
Microsoft Task Manager Worker Service
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subdirectory
SubDir
Signatures
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Quasar payload 3 IoCs
Processes:
resource yara_rule behavioral1/memory/2480-1-0x0000000000BC0000-0x0000000000EE4000-memory.dmp family_quasar C:\Users\Admin\AppData\Roaming\SubDir\Client.exe family_quasar behavioral1/memory/2824-8-0x0000000000250000-0x0000000000574000-memory.dmp family_quasar -
Executes dropped EXE 1 IoCs
Processes:
Client.exepid process 2824 Client.exe -
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
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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 2720 schtasks.exe 1452 schtasks.exe -
Suspicious use of AdjustPrivilegeToken 2 IoCs
Processes:
Client-built.exeClient.exedescription pid process Token: SeDebugPrivilege 2480 Client-built.exe Token: SeDebugPrivilege 2824 Client.exe -
Suspicious use of FindShellTrayWindow 1 IoCs
Processes:
Client.exepid process 2824 Client.exe -
Suspicious use of SendNotifyMessage 1 IoCs
Processes:
Client.exepid process 2824 Client.exe -
Suspicious use of SetWindowsHookEx 1 IoCs
Processes:
Client.exepid process 2824 Client.exe -
Suspicious use of WriteProcessMemory 9 IoCs
Processes:
Client-built.exeClient.exedescription pid process target process PID 2480 wrote to memory of 1452 2480 Client-built.exe schtasks.exe PID 2480 wrote to memory of 1452 2480 Client-built.exe schtasks.exe PID 2480 wrote to memory of 1452 2480 Client-built.exe schtasks.exe PID 2480 wrote to memory of 2824 2480 Client-built.exe Client.exe PID 2480 wrote to memory of 2824 2480 Client-built.exe Client.exe PID 2480 wrote to memory of 2824 2480 Client-built.exe Client.exe PID 2824 wrote to memory of 2720 2824 Client.exe schtasks.exe PID 2824 wrote to memory of 2720 2824 Client.exe schtasks.exe PID 2824 wrote to memory of 2720 2824 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\Client-built.exe"C:\Users\Admin\AppData\Local\Temp\Client-built.exe"1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
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C:\Windows\system32\schtasks.exe"schtasks" /create /tn "Microsoft Task Manager Worker Service" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f2⤵
- Scheduled Task/Job: Scheduled Task
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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 FindShellTrayWindow
- Suspicious use of SendNotifyMessage
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
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C:\Windows\system32\schtasks.exe"schtasks" /create /tn "Microsoft Task Manager Worker Service" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f3⤵
- Scheduled Task/Job: Scheduled Task
Network
MITRE ATT&CK Matrix ATT&CK v13
Replay Monitor
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Downloads
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C:\Users\Admin\AppData\Roaming\SubDir\Client.exeFilesize
3.1MB
MD51e48869d1ce254c1aba0e61aedcdba8e
SHA1cf79b1e78d9e1616208e653c4df4eef3b9f7360b
SHA256ca182b6ce56a01a69122b24469fe5ad78e0cda78caeb49e5a814e2ac5774a10a
SHA512fc6469a2297258cd9723f2d6c795e78c5b065ed709384bb18fe0fb8255cb2760e0633ec2683652ef88abd87ac21ef1d31eee3fd35e64f464d4da0c205fdcb343
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memory/2480-0-0x000007FEF5FB3000-0x000007FEF5FB4000-memory.dmpFilesize
4KB
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memory/2480-1-0x0000000000BC0000-0x0000000000EE4000-memory.dmpFilesize
3.1MB
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memory/2480-2-0x000007FEF5FB0000-0x000007FEF699C000-memory.dmpFilesize
9.9MB
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memory/2480-9-0x000007FEF5FB0000-0x000007FEF699C000-memory.dmpFilesize
9.9MB
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memory/2824-8-0x0000000000250000-0x0000000000574000-memory.dmpFilesize
3.1MB
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memory/2824-10-0x000007FEF5FB0000-0x000007FEF699C000-memory.dmpFilesize
9.9MB
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memory/2824-11-0x000007FEF5FB0000-0x000007FEF699C000-memory.dmpFilesize
9.9MB
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memory/2824-12-0x000007FEF5FB0000-0x000007FEF699C000-memory.dmpFilesize
9.9MB