Analysis
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max time kernel
1045s -
max time network
551s -
platform
windows10-ltsc 2021_x64 -
resource
win10ltsc2021-20241211-en -
resource tags
arch:x64arch:x86image:win10ltsc2021-20241211-enlocale:en-usos:windows10-ltsc 2021-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 behavioral3/memory/4736-1-0x0000000000750000-0x0000000000A74000-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-1-5-21-1411052346-3904498293-150013998-1000\Control Panel\International\Geo\Nation Client-built.exe -
Executes dropped EXE 1 IoCs
pid Process 4528 YSzANwffvO4D.exe -
Drops file in System32 directory 2 IoCs
description ioc Process File opened for modification C:\Windows\system32\config\systemprofile\AppData\Local\Microsoft\Windows\Caches\cversions.3.db LogonUI.exe File opened for modification C:\Windows\system32\config\systemprofile\AppData\Local\Microsoft\Windows\1033\StructuredQuerySchema.bin LogonUI.exe -
Drops file in Windows directory 1 IoCs
description ioc Process File created C:\Windows\rescache\_merged\2229298842\827415343.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 YSzANwffvO4D.exe -
Modifies data under HKEY_USERS 15 IoCs
description ioc Process Set value (int) \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\EnableWindowColorization = "165" 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\Themes\History LogonUI.exe Set value (int) \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationColor = "3288365271" LogonUI.exe Set value (int) \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationBlurBalance = "1" LogonUI.exe Set value (int) \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\AccentColor = "4292311040" LogonUI.exe Set value (int) \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationAfterglowBalance = "10" 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 Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM LogonUI.exe Set value (int) \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Themes\History\AutoColor = "0" 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\DWM\ColorizationColorBalance = "89" 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\DWM\ColorizationAfterglow = "3288365271" LogonUI.exe -
Suspicious use of AdjustPrivilegeToken 8 IoCs
description pid Process Token: SeDebugPrivilege 4736 Client-built.exe Token: SeDebugPrivilege 4528 YSzANwffvO4D.exe Token: 33 3448 AUDIODG.EXE Token: SeIncBasePriorityPrivilege 3448 AUDIODG.EXE Token: SeShutdownPrivilege 3152 shutdown.exe Token: SeRemoteShutdownPrivilege 3152 shutdown.exe Token: SeShutdownPrivilege 4116 LogonUI.exe Token: SeCreatePagefilePrivilege 4116 LogonUI.exe -
Suspicious use of FindShellTrayWindow 4 IoCs
pid Process 4736 Client-built.exe 4736 Client-built.exe 4736 Client-built.exe 4736 Client-built.exe -
Suspicious use of SendNotifyMessage 4 IoCs
pid Process 4736 Client-built.exe 4736 Client-built.exe 4736 Client-built.exe 4736 Client-built.exe -
Suspicious use of SetWindowsHookEx 2 IoCs
pid Process 4116 LogonUI.exe 4116 LogonUI.exe -
Suspicious use of WriteProcessMemory 5 IoCs
description pid Process procid_target PID 4736 wrote to memory of 4528 4736 Client-built.exe 104 PID 4736 wrote to memory of 4528 4736 Client-built.exe 104 PID 4736 wrote to memory of 4528 4736 Client-built.exe 104 PID 4736 wrote to memory of 3152 4736 Client-built.exe 107 PID 4736 wrote to memory of 3152 4736 Client-built.exe 107
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:4736 -
C:\Users\Admin\AppData\Local\Temp\YSzANwffvO4D.exe"C:\Users\Admin\AppData\Local\Temp\YSzANwffvO4D.exe"2⤵
- Executes dropped EXE
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
PID:4528
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C:\Windows\System32\shutdown.exe"C:\Windows\System32\shutdown.exe" /s /t 02⤵
- Suspicious use of AdjustPrivilegeToken
PID:3152
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C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe"C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --string-annotations=is-enterprise-managed=no --field-trial-handle=5040,i,418820165226066361,4591810059585231024,262144 --variations-seed-version --mojo-platform-channel-handle=3044 /prefetch:81⤵PID:2916
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C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe"C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --string-annotations=is-enterprise-managed=no --field-trial-handle=5252,i,418820165226066361,4591810059585231024,262144 --variations-seed-version --mojo-platform-channel-handle=3340 /prefetch:81⤵PID:732
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C:\Windows\system32\AUDIODG.EXEC:\Windows\system32\AUDIODG.EXE 0x2f8 0x4a81⤵
- Suspicious use of AdjustPrivilegeToken
PID:3448
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C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe"C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --string-annotations=is-enterprise-managed=no --field-trial-handle=3332,i,418820165226066361,4591810059585231024,262144 --variations-seed-version --mojo-platform-channel-handle=5160 /prefetch:81⤵PID:1084
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C:\Windows\system32\LogonUI.exe"LogonUI.exe" /flags:0x4 /state0:0xa39ea055 /state1:0x41c64e6d1⤵
- Drops file in System32 directory
- Drops file in Windows directory
- Modifies data under HKEY_USERS
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
PID:4116
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
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Filesize
854KB
MD55fdbb633c00c6ae9a7f850236e0eb4c4
SHA13779b3e58e64b7045abd0ab8764918285b2e24d4
SHA256ec2fc127825e04f42d45c436cf7ee484aac78bdb94b4ea4d077d6b7c88379037
SHA512710ea49f9a1aea061c5c887d6025da86be6ce0cbd40a42c71c8f1c78438ffdbbbe34ed4b8853f1e3468e3ae3e629ef147b271dbceac0b83542ece08dfcd12e61