Analysis
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max time kernel
149s -
max time network
151s -
platform
windows10-2004_x64 -
resource
win10v2004-20240611-en -
resource tags
arch:x64arch:x86image:win10v2004-20240611-enlocale:en-usos:windows10-2004-x64system -
submitted
30-06-2024 15:31
Behavioral task
behavioral1
Sample
Client-built.exe
Resource
win7-20231129-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 2 IoCs
Processes:
resource yara_rule behavioral2/memory/4888-1-0x00000000004D0000-0x00000000007F4000-memory.dmp family_quasar C:\Users\Admin\AppData\Roaming\SubDir\Client.exe family_quasar -
Executes dropped EXE 1 IoCs
Processes:
Client.exepid process 2052 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 1580 schtasks.exe 3204 schtasks.exe -
Suspicious use of AdjustPrivilegeToken 2 IoCs
Processes:
Client-built.exeClient.exedescription pid process Token: SeDebugPrivilege 4888 Client-built.exe Token: SeDebugPrivilege 2052 Client.exe -
Suspicious use of FindShellTrayWindow 1 IoCs
Processes:
Client.exepid process 2052 Client.exe -
Suspicious use of SendNotifyMessage 1 IoCs
Processes:
Client.exepid process 2052 Client.exe -
Suspicious use of SetWindowsHookEx 1 IoCs
Processes:
Client.exepid process 2052 Client.exe -
Suspicious use of WriteProcessMemory 6 IoCs
Processes:
Client-built.exeClient.exedescription pid process target process PID 4888 wrote to memory of 1580 4888 Client-built.exe schtasks.exe PID 4888 wrote to memory of 1580 4888 Client-built.exe schtasks.exe PID 4888 wrote to memory of 2052 4888 Client-built.exe Client.exe PID 4888 wrote to memory of 2052 4888 Client-built.exe Client.exe PID 2052 wrote to memory of 3204 2052 Client.exe schtasks.exe PID 2052 wrote to memory of 3204 2052 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
Loading Replay Monitor...
Downloads
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C:\Users\Admin\AppData\Roaming\SubDir\Client.exeFilesize
3.1MB
MD51e48869d1ce254c1aba0e61aedcdba8e
SHA1cf79b1e78d9e1616208e653c4df4eef3b9f7360b
SHA256ca182b6ce56a01a69122b24469fe5ad78e0cda78caeb49e5a814e2ac5774a10a
SHA512fc6469a2297258cd9723f2d6c795e78c5b065ed709384bb18fe0fb8255cb2760e0633ec2683652ef88abd87ac21ef1d31eee3fd35e64f464d4da0c205fdcb343
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memory/2052-10-0x00007FFCCD2C0000-0x00007FFCCDD81000-memory.dmpFilesize
10.8MB
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memory/2052-11-0x00007FFCCD2C0000-0x00007FFCCDD81000-memory.dmpFilesize
10.8MB
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memory/2052-12-0x000000001CA20000-0x000000001CA70000-memory.dmpFilesize
320KB
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memory/2052-13-0x000000001CB30000-0x000000001CBE2000-memory.dmpFilesize
712KB
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memory/2052-14-0x00007FFCCD2C0000-0x00007FFCCDD81000-memory.dmpFilesize
10.8MB
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memory/4888-0-0x00007FFCCD2C3000-0x00007FFCCD2C5000-memory.dmpFilesize
8KB
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memory/4888-1-0x00000000004D0000-0x00000000007F4000-memory.dmpFilesize
3.1MB
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memory/4888-2-0x00007FFCCD2C0000-0x00007FFCCDD81000-memory.dmpFilesize
10.8MB
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memory/4888-9-0x00007FFCCD2C0000-0x00007FFCCDD81000-memory.dmpFilesize
10.8MB