Analysis
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max time kernel
596s -
max time network
598s -
platform
windows11-21h2_x64 -
resource
win11-20241007-fr -
resource tags
arch:x64arch:x86image:win11-20241007-frlocale:fr-fros:windows11-21h2-x64systemwindows -
submitted
04-01-2025 09:53
Behavioral task
behavioral1
Sample
Client-built.exe
Resource
win10v2004-20241007-fr
Behavioral task
behavioral2
Sample
Client-built.exe
Resource
win10ltsc2021-20241211-fr
General
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Target
Client-built.exe
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Size
3.1MB
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MD5
00213fcafbc3094166240f85a2113a48
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SHA1
bca3cb12ffc1deecaa48e75fd044d12bbbfdc7be
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SHA256
f84484392271761f6894d474af57c959f72b40bf0afbd3ff00c34d9aaadd49f6
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SHA512
b048cc823268d731b0b35600723cb4a58fa108f1ef48f1ebad7b522a6c8656c981e363d5a908403b1ef20909d2624c325d22df2143774190b12f5fcb3741fa10
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SSDEEP
49152:rvmI22SsaNYfdPBldt698dBcjHGCW1JbLoGd4THHB72eh2NT:rvr22SsaNYfdPBldt6+dBcjHGCi
Malware Config
Extracted
quasar
1.4.1
Office04
192.168.1.46:4782
f6997eed-21d3-4b8e-b10b-56ea04111c63
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encryption_key
7E7C408B51CEDDF4082BCC64D506AE67B3B3044D
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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 family
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Quasar payload 2 IoCs
resource yara_rule behavioral3/memory/4900-1-0x0000000000630000-0x0000000000954000-memory.dmp family_quasar behavioral3/files/0x001b00000002aab6-6.dat family_quasar -
Executes dropped EXE 1 IoCs
pid Process 2012 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 1336 schtasks.exe 1136 schtasks.exe -
Suspicious use of AdjustPrivilegeToken 2 IoCs
description pid Process Token: SeDebugPrivilege 4900 Client-built.exe Token: SeDebugPrivilege 2012 Client.exe -
Suspicious use of WriteProcessMemory 6 IoCs
description pid Process procid_target PID 4900 wrote to memory of 1136 4900 Client-built.exe 77 PID 4900 wrote to memory of 1136 4900 Client-built.exe 77 PID 4900 wrote to memory of 2012 4900 Client-built.exe 79 PID 4900 wrote to memory of 2012 4900 Client-built.exe 79 PID 2012 wrote to memory of 1336 2012 Client.exe 80 PID 2012 wrote to memory of 1336 2012 Client.exe 80 -
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:4900 -
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:1136
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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 WriteProcessMemory
PID:2012 -
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:1336
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C:\Windows\system32\svchost.exeC:\Windows\system32\svchost.exe -k LocalService -p -s NPSMSvc1⤵PID:4888
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
Loading Replay Monitor...
Downloads
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Filesize
3.1MB
MD500213fcafbc3094166240f85a2113a48
SHA1bca3cb12ffc1deecaa48e75fd044d12bbbfdc7be
SHA256f84484392271761f6894d474af57c959f72b40bf0afbd3ff00c34d9aaadd49f6
SHA512b048cc823268d731b0b35600723cb4a58fa108f1ef48f1ebad7b522a6c8656c981e363d5a908403b1ef20909d2624c325d22df2143774190b12f5fcb3741fa10