Analysis
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max time kernel
142s -
max time network
164s -
platform
windows11-21h2_x64 -
resource
win11-20240412-en -
resource tags
arch:x64arch:x86image:win11-20240412-enlocale:en-usos:windows11-21h2-x64system -
submitted
17-04-2024 11:27
Behavioral task
behavioral1
Sample
mainn.exe
Resource
win10v2004-20240412-en
General
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Target
mainn.exe
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Size
3.3MB
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MD5
88daabfadfec7379a7b25ff1602dd7bd
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SHA1
65c3f35d7150df340ca797a2662437933178c9b5
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SHA256
0268b6f80286ff64286d42529c76f9e744932ca5a650b7e9ef2c3c0afc01af79
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SHA512
7a205e62c3608fcad774dea6384ae7da904a2ba090b9b6f30454bd23eab9f54a1dbaffd72c3534c554c468a5efaa90d75f659e74fdba3ee8581cbb9356c68aa2
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SSDEEP
49152:7vBt62XlaSFNWPjljiFa2RoUYI1bxNESEgk/iSLoGdDTHHB72eh2NT:7vr62XlaSFNWPjljiFXRoUYIJxbc
Malware Config
Extracted
quasar
1.4.1
Office04
192.168.12.185:4782
15144cdb-7c06-478d-9be3-8228cfe2eee6
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encryption_key
5FCAB94261E1E836E0ECC532E93B636646535E65
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install_name
Conhost.exe
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log_directory
Scex
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reconnect_delay
3000
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startup_key
Google Chrome
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subdirectory
SubDir
Signatures
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Quasar payload 2 IoCs
Processes:
resource yara_rule behavioral2/memory/1248-0-0x00000000008C0000-0x0000000000C08000-memory.dmp family_quasar C:\Windows\System32\SubDir\Conhost.exe family_quasar -
Executes dropped EXE 1 IoCs
Processes:
Conhost.exepid process 944 Conhost.exe -
Drops file in System32 directory 5 IoCs
Processes:
Conhost.exemainn.exedescription ioc process File opened for modification C:\Windows\system32\SubDir Conhost.exe File created C:\Windows\system32\SubDir\Conhost.exe mainn.exe File opened for modification C:\Windows\system32\SubDir\Conhost.exe mainn.exe File opened for modification C:\Windows\system32\SubDir mainn.exe File opened for modification C:\Windows\system32\SubDir\Conhost.exe Conhost.exe -
Creates scheduled task(s) 1 TTPs 2 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
Processes:
schtasks.exeschtasks.exepid process 3012 schtasks.exe 2684 schtasks.exe -
Suspicious use of AdjustPrivilegeToken 2 IoCs
Processes:
mainn.exeConhost.exedescription pid process Token: SeDebugPrivilege 1248 mainn.exe Token: SeDebugPrivilege 944 Conhost.exe -
Suspicious use of SetWindowsHookEx 1 IoCs
Processes:
Conhost.exepid process 944 Conhost.exe -
Suspicious use of WriteProcessMemory 6 IoCs
Processes:
mainn.exeConhost.exedescription pid process target process PID 1248 wrote to memory of 2684 1248 mainn.exe schtasks.exe PID 1248 wrote to memory of 2684 1248 mainn.exe schtasks.exe PID 1248 wrote to memory of 944 1248 mainn.exe Conhost.exe PID 1248 wrote to memory of 944 1248 mainn.exe Conhost.exe PID 944 wrote to memory of 3012 944 Conhost.exe schtasks.exe PID 944 wrote to memory of 3012 944 Conhost.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\mainn.exe"C:\Users\Admin\AppData\Local\Temp\mainn.exe"1⤵
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1248 -
C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "Google Chrome" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Conhost.exe" /rl HIGHEST /f2⤵
- Creates scheduled task(s)
PID:2684 -
C:\Windows\system32\SubDir\Conhost.exe"C:\Windows\system32\SubDir\Conhost.exe"2⤵
- Executes dropped EXE
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:944 -
C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "Google Chrome" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Conhost.exe" /rl HIGHEST /f3⤵
- Creates scheduled task(s)
PID:3012
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
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Filesize
3.3MB
MD588daabfadfec7379a7b25ff1602dd7bd
SHA165c3f35d7150df340ca797a2662437933178c9b5
SHA2560268b6f80286ff64286d42529c76f9e744932ca5a650b7e9ef2c3c0afc01af79
SHA5127a205e62c3608fcad774dea6384ae7da904a2ba090b9b6f30454bd23eab9f54a1dbaffd72c3534c554c468a5efaa90d75f659e74fdba3ee8581cbb9356c68aa2