Analysis
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max time kernel
1047s -
max time network
478s -
platform
windows10-2004_x64 -
resource
win10v2004-20241007-en -
resource tags
arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system -
submitted
24-12-2024 16:36
Behavioral task
behavioral1
Sample
Client-built.exe
Resource
win7-20241023-en
Behavioral task
behavioral2
Sample
Client-built.exe
Resource
win10v2004-20241007-en
Behavioral task
behavioral3
Sample
Client-built.exe
Resource
win10ltsc2021-20241211-en
General
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Target
Client-built.exe
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Size
3.1MB
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MD5
2df7f55c626ea8077ef2cc5ffd32dc38
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SHA1
93131a8d6128ea827f1f31ada4391f94bbc1dd06
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SHA256
58f7dda2165a44ddad0d441ba356a0626d1ad619d766a58008320ec5936cdb94
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SHA512
362bfea6ae2127df5da06904407286c0ed49846ec230ae149a46a4cdcdb101987963a406427283d409957427bdc57a77c3ac90f567b3d00ad561f025f10912cc
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SSDEEP
49152:ZvZI22SsaNYfdPBldt698dBcjHVi/2BxmgoGd5UTHHB72eh2NT:Zva22SsaNYfdPBldt6+dBcjHU/O
Malware Config
Extracted
quasar
1.4.1
Office04
85.209.133.15:111
95ddd19c-037b-4e62-8c64-298b31d663b8
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encryption_key
43DE31297B50FED5B1E6867AE89B621C68EF71E2
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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 1 IoCs
resource yara_rule behavioral2/memory/4188-1-0x00000000009F0000-0x0000000000D14000-memory.dmp family_quasar -
Checks computer location settings 2 TTPs 1 IoCs
Looks up country code configured in the registry, likely geofence.
description ioc Process Key value queried \REGISTRY\USER\S-1-5-21-940901362-3608833189-1915618603-1000\Control Panel\International\Geo\Nation Client-built.exe -
Executes dropped EXE 1 IoCs
pid Process 920 eUu0mGet8wkK.exe -
Drops desktop.ini file(s) 1 IoCs
description ioc Process File opened for modification C:\$RECYCLE.BIN\S-1-5-18\desktop.ini LogonUI.exe -
Drops file in Windows directory 1 IoCs
description ioc Process File created C:\Windows\rescache\_merged\2229298842\2626455757.pri LogonUI.exe -
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
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System Location Discovery: System Language Discovery 1 TTPs 1 IoCs
Attempt gather information about the system language of a victim in order to infer the geographical location of that host.
description ioc Process Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language eUu0mGet8wkK.exe -
Modifies data under HKEY_USERS 25 IoCs
description ioc Process Set value (int) \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\AccentColor = "4292311040" LogonUI.exe Set value (int) \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationColor = "3288365271" LogonUI.exe Set value (str) \REGISTRY\USER\.DEFAULT\Software\Classes\Local Settings\MuiCache\26\52C64B7E\@%SystemRoot%\system32\shell32.dll,-50176 = "File Operation" LogonUI.exe Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Themes\History LogonUI.exe Set value (int) \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\Accent\StartColorMenu = "4288567808" LogonUI.exe Set value (int) \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\Accent\AccentColorMenu = "4292311040" LogonUI.exe Set value (int) \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\TelemetrySalt = "4" LogonUI.exe Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\BitBucket\Volume\{625ed6c4-0000-0000-0000-d01200000000} LogonUI.exe Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\BitBucket LogonUI.exe Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM LogonUI.exe Set value (data) \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Shell Extensions\Cached\{40DD6E20-7C17-11CE-A804-00AA003CA9F6} {000214FC-0000-0000-C000-000000000046} 0xFFFF = 0100000000000000590e7c3f2356db01 LogonUI.exe Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer LogonUI.exe Set value (int) \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\EnableWindowColorization = "162" LogonUI.exe Set value (int) \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationGlassAttribute = "1" LogonUI.exe Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Shell Extensions\Cached LogonUI.exe Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\BitBucket\Volume LogonUI.exe Set value (int) \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\BitBucket\Volume\{625ed6c4-0000-0000-0000-d01200000000}\MaxCapacity = "14116" LogonUI.exe Set value (int) \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationColorBalance = "89" LogonUI.exe Set value (int) \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationAfterglow = "3288365271" LogonUI.exe Set value (int) \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationAfterglowBalance = "10" LogonUI.exe Set value (int) \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\BitBucket\Volume\{625ed6c4-0000-0000-0000-d01200000000}\NukeOnDelete = "0" LogonUI.exe Set value (int) \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationBlurBalance = "1" LogonUI.exe Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\Accent LogonUI.exe Set value (data) \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\Accent\AccentPalette = a6d8ff0076b9ed00429ce3000078d700005a9e000042750000264200f7630c00 LogonUI.exe Set value (int) \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Themes\History\AutoColor = "0" LogonUI.exe -
Suspicious use of AdjustPrivilegeToken 8 IoCs
description pid Process Token: SeDebugPrivilege 4188 Client-built.exe Token: SeDebugPrivilege 920 eUu0mGet8wkK.exe Token: 33 3224 AUDIODG.EXE Token: SeIncBasePriorityPrivilege 3224 AUDIODG.EXE Token: SeShutdownPrivilege 3988 shutdown.exe Token: SeRemoteShutdownPrivilege 3988 shutdown.exe Token: SeShutdownPrivilege 4568 LogonUI.exe Token: SeCreatePagefilePrivilege 4568 LogonUI.exe -
Suspicious use of FindShellTrayWindow 4 IoCs
pid Process 4188 Client-built.exe 4188 Client-built.exe 4188 Client-built.exe 4188 Client-built.exe -
Suspicious use of SendNotifyMessage 4 IoCs
pid Process 4188 Client-built.exe 4188 Client-built.exe 4188 Client-built.exe 4188 Client-built.exe -
Suspicious use of SetWindowsHookEx 2 IoCs
pid Process 4568 LogonUI.exe 4568 LogonUI.exe -
Suspicious use of WriteProcessMemory 5 IoCs
description pid Process procid_target PID 4188 wrote to memory of 920 4188 Client-built.exe 99 PID 4188 wrote to memory of 920 4188 Client-built.exe 99 PID 4188 wrote to memory of 920 4188 Client-built.exe 99 PID 4188 wrote to memory of 3988 4188 Client-built.exe 104 PID 4188 wrote to memory of 3988 4188 Client-built.exe 104
Processes
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C:\Users\Admin\AppData\Local\Temp\Client-built.exe"C:\Users\Admin\AppData\Local\Temp\Client-built.exe"1⤵
- Checks computer location settings
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of FindShellTrayWindow
- Suspicious use of SendNotifyMessage
- Suspicious use of WriteProcessMemory
PID:4188 -
C:\Users\Admin\AppData\Local\Temp\eUu0mGet8wkK.exe"C:\Users\Admin\AppData\Local\Temp\eUu0mGet8wkK.exe"2⤵
- Executes dropped EXE
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
PID:920
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C:\Windows\System32\shutdown.exe"C:\Windows\System32\shutdown.exe" /s /t 02⤵
- Suspicious use of AdjustPrivilegeToken
PID:3988
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C:\Windows\system32\AUDIODG.EXEC:\Windows\system32\AUDIODG.EXE 0x2c8 0x4bc1⤵
- Suspicious use of AdjustPrivilegeToken
PID:3224
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C:\Windows\system32\LogonUI.exe"LogonUI.exe" /flags:0x4 /state0:0xa38c9055 /state1:0x41c64e6d1⤵
- Drops desktop.ini file(s)
- Drops file in Windows directory
- Modifies data under HKEY_USERS
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
PID:4568
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
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C:\ProgramData\Microsoft\Windows\SystemData\S-1-5-21-940901362-3608833189-1915618603-1000\ReadOnly\LockScreen_O\LockScreen___1280_0720_notdimmed.jpg
Filesize296KB
MD54760e6b503731c2f2c17f6d70f3d599e
SHA11a144d5f990a0b11dde2132f8ffce207ca40d139
SHA256a4db65b004f5fc15e225559ee56cac1c065df80c50f12d0a0a38f17b2e03b4fc
SHA512d665569b6b9fa4849930e0064a4b7e9fd77d0bb655bc69e363d6a2990c0fa5729b8c282a09fee977b66ea2c1bafce3e7dc8f62c507a3f2d0c2215d2ff9c13871
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Filesize
854KB
MD55fdbb633c00c6ae9a7f850236e0eb4c4
SHA13779b3e58e64b7045abd0ab8764918285b2e24d4
SHA256ec2fc127825e04f42d45c436cf7ee484aac78bdb94b4ea4d077d6b7c88379037
SHA512710ea49f9a1aea061c5c887d6025da86be6ce0cbd40a42c71c8f1c78438ffdbbbe34ed4b8853f1e3468e3ae3e629ef147b271dbceac0b83542ece08dfcd12e61