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Analysis
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max time kernel
147s -
max time network
145s -
platform
windows10-2004_x64 -
resource
win10v2004-20241007-en -
resource tags
arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system -
submitted
28/12/2024, 05:26
Behavioral task
behavioral1
Sample
Cryptor/Client-built.exe
Resource
win7-20240903-en
Behavioral task
behavioral2
Sample
Cryptor/Client-built.exe
Resource
win10v2004-20241007-en
Behavioral task
behavioral3
Sample
Cryptor/Cryptor.exe
Resource
win7-20240903-en
Behavioral task
behavioral4
Sample
Cryptor/Cryptor.exe
Resource
win10v2004-20241007-en
General
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Target
Cryptor/Client-built.exe
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Size
3.1MB
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MD5
ffde80003bb39e45f92460a84b343771
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SHA1
1ada86e287115526fc12d74865de3ca0c59c8c08
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SHA256
e057b678ff3bca92b8672af195249608bcb56cfd01c1980d14b7c3e4d6952c8b
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SHA512
4ae9adb21f511b1d114d5258d24d5b138a387149c593ed0743ad644ddb9461a248919ed305dbaae6b9beed9ed4525f8ad23a653c4b6507e7a021ea05a35961b4
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SSDEEP
49152:uvRt62XlaSFNWPjljiFa2RoUYI9yL37ar1LoGdZ+47UTHHB72eh2NT:uvb62XlaSFNWPjljiFXRoUYIA3O
Malware Config
Extracted
quasar
1.4.1
Office04
127.0.0.1:4782
b8be2b57-3322-4df8-967c-65aedf2d425d
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encryption_key
5871F8D84AF9E4D8F5ABACF2A5DD66E256B5A672
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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 behavioral2/memory/3980-1-0x0000000000210000-0x0000000000534000-memory.dmp family_quasar behavioral2/files/0x000a000000023b77-5.dat family_quasar -
Executes dropped EXE 1 IoCs
pid Process 228 Client.exe -
Drops file in Program Files directory 2 IoCs
description ioc Process File opened for modification C:\Program Files\SubDir\Client.exe Client-built.exe File created C:\Program Files\SubDir\Client.exe Client-built.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 3584 schtasks.exe 380 schtasks.exe -
Suspicious use of AdjustPrivilegeToken 2 IoCs
description pid Process Token: SeDebugPrivilege 3980 Client-built.exe Token: SeDebugPrivilege 228 Client.exe -
Suspicious use of FindShellTrayWindow 1 IoCs
pid Process 228 Client.exe -
Suspicious use of SendNotifyMessage 1 IoCs
pid Process 228 Client.exe -
Suspicious use of SetWindowsHookEx 1 IoCs
pid Process 228 Client.exe -
Suspicious use of WriteProcessMemory 6 IoCs
description pid Process procid_target PID 3980 wrote to memory of 3584 3980 Client-built.exe 82 PID 3980 wrote to memory of 3584 3980 Client-built.exe 82 PID 3980 wrote to memory of 228 3980 Client-built.exe 84 PID 3980 wrote to memory of 228 3980 Client-built.exe 84 PID 228 wrote to memory of 380 228 Client.exe 85 PID 228 wrote to memory of 380 228 Client.exe 85 -
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\Cryptor\Client-built.exe"C:\Users\Admin\AppData\Local\Temp\Cryptor\Client-built.exe"1⤵
- Drops file in Program Files directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3980 -
C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Program Files\SubDir\Client.exe" /rl HIGHEST /f2⤵
- Scheduled Task/Job: Scheduled Task
PID:3584
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C:\Program Files\SubDir\Client.exe"C:\Program Files\SubDir\Client.exe"2⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of FindShellTrayWindow
- Suspicious use of SendNotifyMessage
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:228 -
C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Program Files\SubDir\Client.exe" /rl HIGHEST /f3⤵
- Scheduled Task/Job: Scheduled Task
PID:380
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Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
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Filesize
3.1MB
MD5ffde80003bb39e45f92460a84b343771
SHA11ada86e287115526fc12d74865de3ca0c59c8c08
SHA256e057b678ff3bca92b8672af195249608bcb56cfd01c1980d14b7c3e4d6952c8b
SHA5124ae9adb21f511b1d114d5258d24d5b138a387149c593ed0743ad644ddb9461a248919ed305dbaae6b9beed9ed4525f8ad23a653c4b6507e7a021ea05a35961b4