Analysis
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max time kernel
131s -
max time network
144s -
platform
windows7_x64 -
resource
win7-20240708-en -
resource tags
arch:x64arch:x86image:win7-20240708-enlocale:en-usos:windows7-x64system -
submitted
28-07-2024 19:07
Behavioral task
behavioral1
Sample
Loader.exe
Resource
win7-20240708-en
General
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Target
Loader.exe
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Size
3.1MB
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MD5
6c0cfc9686b74302e726ddcc3252740e
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SHA1
a588ad7e2398448a1587576b1f90c9c59bcd78fc
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SHA256
342c074263edefc48959a9c15cb1cc05046c53a1607728eb6679f9c8303680a0
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SHA512
1e9ae56b2ee6bef507cfd3137616b1ea0ffb98c4e0bd5fdf429fb77d5c6ee475ee9d22edacdc883dd7e0bd2b2b6c0e13c43a55f8cf3c84b229a98f42fa1acc02
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SSDEEP
49152:PvyI22SsaNYfdPBldt698dBcjHE/Ta95fQ7k/tLoGdQTHHB72eh2NT:Pvf22SsaNYfdPBldt6+dBcjHMa1
Malware Config
Extracted
quasar
1.4.1
Office04
192.168.1.51:4782
f27e08a6-ff49-4d45-95d3-6cd8cee7819a
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encryption_key
9E15BDE09B20CFD0A6A2957840462A93B6C4BFD6
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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 behavioral1/memory/2356-1-0x0000000000990000-0x0000000000CB4000-memory.dmp family_quasar C:\Users\Admin\AppData\Roaming\SubDir\Client.exe family_quasar behavioral1/memory/2156-8-0x0000000001040000-0x0000000001364000-memory.dmp family_quasar -
Executes dropped EXE 1 IoCs
Processes:
Client.exepid process 2156 Client.exe -
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 1708 schtasks.exe 2960 schtasks.exe -
Suspicious use of AdjustPrivilegeToken 2 IoCs
Processes:
Loader.exeClient.exedescription pid process Token: SeDebugPrivilege 2356 Loader.exe Token: SeDebugPrivilege 2156 Client.exe -
Suspicious use of SetWindowsHookEx 1 IoCs
Processes:
Client.exepid process 2156 Client.exe -
Suspicious use of WriteProcessMemory 9 IoCs
Processes:
Loader.exeClient.exedescription pid process target process PID 2356 wrote to memory of 1708 2356 Loader.exe schtasks.exe PID 2356 wrote to memory of 1708 2356 Loader.exe schtasks.exe PID 2356 wrote to memory of 1708 2356 Loader.exe schtasks.exe PID 2356 wrote to memory of 2156 2356 Loader.exe Client.exe PID 2356 wrote to memory of 2156 2356 Loader.exe Client.exe PID 2356 wrote to memory of 2156 2356 Loader.exe Client.exe PID 2156 wrote to memory of 2960 2156 Client.exe schtasks.exe PID 2156 wrote to memory of 2960 2156 Client.exe schtasks.exe PID 2156 wrote to memory of 2960 2156 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\Loader.exe"C:\Users\Admin\AppData\Local\Temp\Loader.exe"1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2356 -
C:\Windows\system32\schtasks.exe"schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f2⤵
- Scheduled Task/Job: Scheduled Task
PID:1708 -
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:2156 -
C:\Windows\system32\schtasks.exe"schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f3⤵
- Scheduled Task/Job: Scheduled Task
PID:2960
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
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Filesize
3.1MB
MD56c0cfc9686b74302e726ddcc3252740e
SHA1a588ad7e2398448a1587576b1f90c9c59bcd78fc
SHA256342c074263edefc48959a9c15cb1cc05046c53a1607728eb6679f9c8303680a0
SHA5121e9ae56b2ee6bef507cfd3137616b1ea0ffb98c4e0bd5fdf429fb77d5c6ee475ee9d22edacdc883dd7e0bd2b2b6c0e13c43a55f8cf3c84b229a98f42fa1acc02