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Analysis
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max time kernel
436s -
max time network
624s -
platform
windows11-21h2_x64 -
resource
win11-20240704-en -
resource tags
arch:x64arch:x86image:win11-20240704-enlocale:en-usos:windows11-21h2-x64system -
submitted
06/07/2024, 14:05
General
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Target
pegasus.exe
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Size
3.1MB
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MD5
2e46c4fb200c850394e4e708d4c0d36b
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SHA1
dbeae23123b58434eedf7a0462dda53b7ae0fc01
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SHA256
198076159ed4e2443380f81b53f506807e3ef4cca8692084922744548e5383bf
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SHA512
a0c8ec64b280a3c2800cb300d464340a4de79dea2907b3c1d66bb2f54d447794e20f8097d2be6299ae04a395891d33589531142cdc7516131d9afe4e7ac0a8c2
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SSDEEP
49152:3vgt62XlaSFNWPjljiFa2RoUYIyKAi+h8vJihoGdJoTHHB72eh2NT:3vM62XlaSFNWPjljiFXRoUYIMhb5
Malware Config
Extracted
quasar
1.4.1
Office04
90.219.112.122:4782
878b2fb4-192c-4f50-ae38-0881a431b12f
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encryption_key
DB1FE6851C4D98E11497D9AF06379F8966EC065A
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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
Java Updater
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subdirectory
SubDir
Signatures
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Quasar payload 1 IoCs
resource yara_rule behavioral1/memory/4748-1-0x0000000000020000-0x0000000000344000-memory.dmp family_quasar -
Drops file in System32 directory 2 IoCs
description ioc Process File created C:\Windows\system32\SubDir\Client.exe pegasus.exe File opened for modification C:\Windows\system32\SubDir\Client.exe pegasus.exe -
Modifies registry class 1 IoCs
description ioc Process Key created \REGISTRY\USER\S-1-5-21-1945933150-1754111531-3454729080-1000_Classes\Local Settings\MuiCache MiniSearchHost.exe -
Scheduled Task/Job: Scheduled Task 1 TTPs 1 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
pid Process 1452 schtasks.exe -
Suspicious use of AdjustPrivilegeToken 1 IoCs
description pid Process Token: SeDebugPrivilege 4748 pegasus.exe -
Suspicious use of SetWindowsHookEx 1 IoCs
pid Process 1216 MiniSearchHost.exe -
Suspicious use of WriteProcessMemory 2 IoCs
description pid Process procid_target PID 4748 wrote to memory of 1452 4748 pegasus.exe 78 PID 4748 wrote to memory of 1452 4748 pegasus.exe 78 -
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\pegasus.exe"C:\Users\Admin\AppData\Local\Temp\pegasus.exe"1⤵
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4748 -
C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "Java Updater" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f2⤵
- Scheduled Task/Job: Scheduled Task
PID:1452
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C:\Windows\SystemApps\MicrosoftWindows.Client.CBS_cw5n1h2txyewy\MiniSearchHost.exe"C:\Windows\SystemApps\MicrosoftWindows.Client.CBS_cw5n1h2txyewy\MiniSearchHost.exe" -ServerName:MiniSearchUI.AppXj3y73at8fy1htwztzxs68sxx1v7cksp7.mca1⤵
- Modifies registry class
- Suspicious use of SetWindowsHookEx
PID:1216
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C:\Windows\system32\svchost.exeC:\Windows\system32\svchost.exe -k LocalService -p -s NPSMSvc1⤵PID:3640
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C:\Windows\System32\rundll32.exeC:\Windows\System32\rundll32.exe C:\Windows\System32\shell32.dll,SHCreateLocalServerRunDll {9aa46009-3ce0-458a-a354-715610a075e6} -Embedding1⤵PID:3756
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
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C:\Users\Admin\AppData\Local\Packages\MicrosoftWindows.Client.CBS_cw5n1h2txyewy\TempState\SearchHoverUnifiedTileModelCache.dat
Filesize10KB
MD586bc1f430c46c1c8597ba754a8855be9
SHA18be41ec9fb15b246f9c107545ad15314d1160f01
SHA2569f277094b7ff8fe8e320026497542a0b52e2a1be8b108a63a83e8371e0a6bf86
SHA51247655f29fd07921c53d98051c1ce3408b94bb03284526f4cd273e92359e54342233aee4cae1161863df84f17e870f9bb8b80bb7e70c8662280e9a79744fe9e94
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C:\Users\Admin\AppData\Local\Packages\MicrosoftWindows.Client.CBS_cw5n1h2txyewy\TempState\SearchHoverUnifiedTileModelCache.dat
Filesize10KB
MD5d99739e3657b8a4c1259c604069954dd
SHA1450004f5f1c436cc1302bd51dbe81141a6e847e1
SHA25691695bb6bd03a200dfc32e50bf858bcd7d95b598196ae5df7d5bfd1add9ecb36
SHA512bd2f5ca319a57a642a7992533ba0903883134e1460de1598561f72828c20c68e5b3a752defef21962567181e5158df116d725c70bbe1f0042dbc6870b5075dae