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Analysis
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max time kernel
125s -
max time network
143s -
platform
windows10-2004_x64 -
resource
win10v2004-20240802-en -
resource tags
arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system -
submitted
07/08/2024, 00:14
Behavioral task
behavioral1
Sample
Client-built.exe
Resource
win7-20240729-en
General
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Target
Client-built.exe
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Size
3.1MB
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MD5
6f2f7543e46ca0cd1eecf947d68b0ec8
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SHA1
7cf099fee562af351bebcea654e660fb05a5e736
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SHA256
4d9417d9d1f8779020682a3882dc72979a504ea9b71ef51b37084556aa0d7205
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SHA512
5851ea5dc7f9160256fb28fb89784fbbe40e244b55f083175382464eafa6c39d8b0c88aead34812c7c9f1abb6ccc1db84f65d379b4e1e6b65f65dc1a1902117c
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SSDEEP
49152:ivyI22SsaNYfdPBldt698dBcjHh/RJ6EbR3LoGdf41THHB72eh2NT:ivf22SsaNYfdPBldt6+dBcjHh/RJ6O
Malware Config
Extracted
quasar
1.4.1
Office04
192.168.1.85:4782
d31c90bf-6e6a-483d-9f59-e618a1e6c7c9
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encryption_key
705FA42F7E103298DD84CEB0EA11F1B6B9143152
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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 2 IoCs
resource yara_rule behavioral2/memory/3996-1-0x00000000007C0000-0x0000000000AE4000-memory.dmp family_quasar behavioral2/files/0x00080000000234d3-6.dat family_quasar -
Executes dropped EXE 1 IoCs
pid Process 1240 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.
pid Process 2652 schtasks.exe 4048 schtasks.exe -
Suspicious use of AdjustPrivilegeToken 2 IoCs
description pid Process Token: SeDebugPrivilege 3996 Client-built.exe Token: SeDebugPrivilege 1240 Client.exe -
Suspicious use of SetWindowsHookEx 1 IoCs
pid Process 1240 Client.exe -
Suspicious use of WriteProcessMemory 6 IoCs
description pid Process procid_target PID 3996 wrote to memory of 2652 3996 Client-built.exe 88 PID 3996 wrote to memory of 2652 3996 Client-built.exe 88 PID 3996 wrote to memory of 1240 3996 Client-built.exe 90 PID 3996 wrote to memory of 1240 3996 Client-built.exe 90 PID 1240 wrote to memory of 4048 1240 Client.exe 91 PID 1240 wrote to memory of 4048 1240 Client.exe 91 -
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
PID:3996 -
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:2652
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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 SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1240 -
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:4048
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Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
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Filesize
3.1MB
MD56f2f7543e46ca0cd1eecf947d68b0ec8
SHA17cf099fee562af351bebcea654e660fb05a5e736
SHA2564d9417d9d1f8779020682a3882dc72979a504ea9b71ef51b37084556aa0d7205
SHA5125851ea5dc7f9160256fb28fb89784fbbe40e244b55f083175382464eafa6c39d8b0c88aead34812c7c9f1abb6ccc1db84f65d379b4e1e6b65f65dc1a1902117c