Analysis
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max time kernel
149s -
max time network
154s -
platform
windows7_x64 -
resource
win7-20240704-en -
resource tags
arch:x64arch:x86image:win7-20240704-enlocale:en-usos:windows7-x64system -
submitted
16/08/2024, 23:44
Behavioral task
behavioral1
Sample
Client-built.exe
Resource
win7-20240704-en
General
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Target
Client-built.exe
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Size
3.1MB
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MD5
4c11f56b9a516468535cd9dfb4625554
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SHA1
c85f8a363d0bc4071c82648736d04502a0f77b6e
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SHA256
54f96306329acf69543eafbc220bb617151cf4f6572d05a1d99aa2633134b29f
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SHA512
b525267b0de611e119c141962f9b8a2e054b3f5afa15140d098ca278e468658aac649c19b802076461fc283e7b7a826b146b3a2319e2af635df6eb820fd81e1d
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SSDEEP
49152:tmCk6UTYfYnGJCvFt8lJ6QgeC2eH4THHB72eh2NT:tmsUTyYnGJCvFt8lJ6Qg5
Malware Config
Extracted
quasar
1.4.1
SKIDS
147.185.221.22:6712
4464eb7a-fcd4-46b0-a1b1-9f00f87d96f8
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encryption_key
9E968F05BD874BA1BE086FD1774A027473823F49
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install_name
Windows Host Process.exe
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log_directory
WindowsLogs
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reconnect_delay
3000
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startup_key
Windows Host Process
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subdirectory
Windows
Signatures
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Quasar payload 3 IoCs
resource yara_rule behavioral1/memory/2356-1-0x00000000010C0000-0x00000000013EC000-memory.dmp family_quasar behavioral1/files/0x0009000000016d66-6.dat family_quasar behavioral1/memory/2976-9-0x0000000000DF0000-0x000000000111C000-memory.dmp family_quasar -
Executes dropped EXE 1 IoCs
pid Process 2976 Windows Host Process.exe -
Drops file in System32 directory 5 IoCs
description ioc Process File opened for modification C:\Windows\system32\Windows Windows Host Process.exe File created C:\Windows\system32\Windows\Windows Host Process.exe Client-built.exe File opened for modification C:\Windows\system32\Windows\Windows Host Process.exe Client-built.exe File opened for modification C:\Windows\system32\Windows Client-built.exe File opened for modification C:\Windows\system32\Windows\Windows Host Process.exe Windows Host Process.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.
pid Process 2252 schtasks.exe 2760 schtasks.exe -
Suspicious use of AdjustPrivilegeToken 2 IoCs
description pid Process Token: SeDebugPrivilege 2356 Client-built.exe Token: SeDebugPrivilege 2976 Windows Host Process.exe -
Suspicious use of FindShellTrayWindow 1 IoCs
pid Process 2976 Windows Host Process.exe -
Suspicious use of SendNotifyMessage 1 IoCs
pid Process 2976 Windows Host Process.exe -
Suspicious use of SetWindowsHookEx 1 IoCs
pid Process 2976 Windows Host Process.exe -
Suspicious use of WriteProcessMemory 9 IoCs
description pid Process procid_target PID 2356 wrote to memory of 2252 2356 Client-built.exe 30 PID 2356 wrote to memory of 2252 2356 Client-built.exe 30 PID 2356 wrote to memory of 2252 2356 Client-built.exe 30 PID 2356 wrote to memory of 2976 2356 Client-built.exe 32 PID 2356 wrote to memory of 2976 2356 Client-built.exe 32 PID 2356 wrote to memory of 2976 2356 Client-built.exe 32 PID 2976 wrote to memory of 2760 2976 Windows Host Process.exe 33 PID 2976 wrote to memory of 2760 2976 Windows Host Process.exe 33 PID 2976 wrote to memory of 2760 2976 Windows Host Process.exe 33 -
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⤵
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2356 -
C:\Windows\system32\schtasks.exe"schtasks" /create /tn "Windows Host Process" /sc ONLOGON /tr "C:\Windows\system32\Windows\Windows Host Process.exe" /rl HIGHEST /f2⤵
- Scheduled Task/Job: Scheduled Task
PID:2252
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C:\Windows\system32\Windows\Windows Host Process.exe"C:\Windows\system32\Windows\Windows Host Process.exe"2⤵
- Executes dropped EXE
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of FindShellTrayWindow
- Suspicious use of SendNotifyMessage
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:2976 -
C:\Windows\system32\schtasks.exe"schtasks" /create /tn "Windows Host Process" /sc ONLOGON /tr "C:\Windows\system32\Windows\Windows Host Process.exe" /rl HIGHEST /f3⤵
- Scheduled Task/Job: Scheduled Task
PID:2760
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Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
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Filesize
3.1MB
MD54c11f56b9a516468535cd9dfb4625554
SHA1c85f8a363d0bc4071c82648736d04502a0f77b6e
SHA25654f96306329acf69543eafbc220bb617151cf4f6572d05a1d99aa2633134b29f
SHA512b525267b0de611e119c141962f9b8a2e054b3f5afa15140d098ca278e468658aac649c19b802076461fc283e7b7a826b146b3a2319e2af635df6eb820fd81e1d