Threat Database Backdoors Backdoor.MSIL.Quasar.CB

Backdoor.MSIL.Quasar.CB

By CagedTech in Backdoors

Threat Scorecard

Popularity Rank: 8,214
Threat Level: 60 % (Medium)
Infected Computers: 302
First Seen: January 10, 2024
Last Seen: February 4, 2026
OS(es) Affected: Windows

Analysis Report

General information

Family Name: Backdoor.MSIL.Quasar.CB
Signature status: No Signature

Known Samples

MD5: 5bfd23d919cdca24ca00fd209fb2c892
SHA1: 26ed7e77c2f0e908c44ae91583df7b7d89eb09ab
File Size: 3.27 MB, 3265536 bytes
MD5: e63e1002264bfab0984f5bbaa6b087c3
SHA1: bfd51cdb12fc254f73de42bc86d621bee7baefda
File Size: 3.27 MB, 3266048 bytes
MD5: b7a22e3a5f77693df1e60c609422e3c6
SHA1: 788806aaddb01339b9fc3565c3c639b35293be06
SHA256: 9E2C555B3A28BD2FB7DEB92BBF17DB87BBDE1ECCF67968946E0610C1DD0B1FAF
File Size: 3.27 MB, 3265536 bytes
MD5: 6d122e686eee5c07efc1b77aa8aa0964
SHA1: 6670ed216aa90152e520e2e9ac8d77182eebcaa6
SHA256: BF3B25A2B492A680410CE9E11BC6CA565421AAAB80F1544688233E4E46BE667C
File Size: 3.27 MB, 3269120 bytes
MD5: d014ed4d60a17350c71d2e5802375db1
SHA1: 06a79f2c3f05936c719c41ed9894291bedefbdd3
SHA256: 360C50039718ABA457E304430E4473FFEF01F1AAE1DEA14C26805D2BBC4235C1
File Size: 3.27 MB, 3265536 bytes
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MD5: e22042f26afb819589df0c802700c19b
SHA1: dd23705275195878ef2daaefef3db67765076dda
SHA256: A01BD1832D20DE21F4F5F6B7A72987D8C83C70BE17AC8730CC67074C901C071E
File Size: 3.27 MB, 3265536 bytes
MD5: 84000533ecb2ad9cc3cc8b0ed4919393
SHA1: e2538225215ae24b4cfb52dd5825525d1b1471b7
SHA256: 4140A54E72BBB6A8E103CB109F88FE5A62B2F83735F085D9612674A17B48EF2D
File Size: 3.27 MB, 3265536 bytes
MD5: 2be09e53d5ce933bafcb0bf54143f0d3
SHA1: df7055de0aa17d40e0edbe92ac204670b68f119e
SHA256: C2FF2628B8FEF2F29D326F6B21A7EE79A4367A1066E5151FF524A0B084922A47
File Size: 3.27 MB, 3265536 bytes
MD5: f13287e4ccba22c67cb56af757086b7d
SHA1: 3e0780337841c7c9117661f057f49ccac16deb6a
SHA256: 441361AED58CCA83DDAE2000305153C4BD471D379201D7B964489148D0D3922A
File Size: 3.27 MB, 3266048 bytes
MD5: 05190a8f5edd34062bcaaa1dae84242f
SHA1: 0d5ba02e4d891b351e8aa269989feb3789ea0ad5
SHA256: 616D158A93F67CB26999D87B80FE512661E27543BDDC3973B34665EED79F1B03
File Size: 3.27 MB, 3266048 bytes

Windows Portable Executable Attributes

  • File doesn't have "Rich" header
  • File doesn't have debug information
  • File doesn't have exports table
  • File doesn't have security information
  • File is .NET application
  • File is 32-bit executable
  • File is either console or GUI application
  • File is GUI application (IMAGE_SUBSYSTEM_WINDOWS_GUI)
  • File is not packed
  • IMAGE_FILE_DLL is not set inside PE header (Executable)
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  • IMAGE_FILE_EXECUTABLE_IMAGE is set inside PE header (Executable Image)

Windows PE Version Information

Name Value
Assembly Version
  • 2.1.1.4
  • 1.4.1.0
  • 1.0.0.0
Company Name Manthe Industries, LLC
File Description
  • microsoft
  • Quasar Client
File Version
  • 2.1.1.4
  • 1.4.1
  • 1.0
Internal Name
  • Client.exe
  • Spook_V2.1.1.4.exe
Legal Copyright
  • Copyright © MaxXor 2023
  • Manthe Industries, LLC
Legal Trademarks Manthe Industries, LLC
Original Filename
  • Client.exe
  • Spook_V2.1.1.4.exe
Product Name
  • Quasar
  • Spook Client
Product Version
  • 2.1.1.4
  • 1.4.1
  • 1.0

File Traits

  • .NET
  • Run
  • x86

Block Information

Total Blocks: 14,560
Potentially Malicious Blocks: 308
Whitelisted Blocks: 14,252
Unknown Blocks: 0

Visual Map

x x x x 0 0 x x x x x x x 0 0 0 x 0 x x 0 x x x 0 x x 0 x x x x 0 x x x 0 x x x x x x x x x x x x x x 0 0 x x x x x x x x x x 0 x x x x x x x x x x x x x x x x x x x x x x x 0 x x x 0 x x x 0 x 0 0 0 0 0 x x 0 0 0 0 0 0 x x 0 0 0 0 0 0 x x x x 0 0 0 0 0 0 0 x 0 0 0 0 0 0 0 x x x x x x x x x x x x 0 x 0 x x x x 0 0 0 0 0 x x x x x 0 x x x x x x x x x 0 x 0 x 0 0 0 0 x 0 0 x x 0 0 x x x x x x x x x x x 0 x x x x x 0 0 0 x 0 0 x 0 0 0 0 x 0 x x 0 0 x 0 x x x x 0 x 0 0 x x x 0 x x x x x x 0 x 0 x x x x 0 0 x x 0 0 x 0 0 x x x x x 0 x 0 0 0 0 x x x x x x x x x x x x 0 0 0 0 x x x x x x x x 0 x x x x x x x x 0 x x x x 0 x x x 0 x x x x x x x x x x 0 x x x 0 x x x 0 x 0 x x 0 x x x x 0 x x x x x 0 x x 0 0 0 x 0 0 0 0 x 0 0 x x x x 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 x 0 x 0 0 0 0 0 x 0 0 0 0 x 0 0 0 x 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 x 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 x 0 0 0 0 0 x x x 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 x 0 0 x x x x x 0 0 x x x x 0 x x x x 0 x 0 0 x 0 x 0 0 0 x x 0 x 0 x 0 0 0 0 x x x x 0 0 0 x x x x 0 0 0 0 x 0 0 x x 0 x x 0 x x x x 0 x x x x 0 x x 0 x x x x 0 x 0 x 0 x x 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
... Data truncated
0 - Probable Safe Block
? - Unknown Block
x - Potentially Malicious Block

Similar Families

  • MSIL.Mardom.SF
  • MSIL.Quasar.B
  • MSIL.Quasar.CA
  • MSIL.Quasar.CB
  • MSIL.Spy.RC
Show More
  • MSIL.Spy.RCB

Windows API Usage

Category API
Syscall Use
  • ntdll.dll!NtAlertThreadByThreadId
  • ntdll.dll!NtAlpcSendWaitReceivePort
  • ntdll.dll!NtApphelpCacheControl
  • ntdll.dll!NtClearEvent
  • ntdll.dll!NtClose
  • ntdll.dll!NtConnectPort
  • ntdll.dll!NtCreateEvent
  • ntdll.dll!NtCreateFile
  • ntdll.dll!NtCreateMutant
  • ntdll.dll!NtCreatePrivateNamespace
Show More
  • ntdll.dll!NtCreateSection
  • ntdll.dll!NtCreateThreadEx
  • ntdll.dll!NtDeviceIoControlFile
  • ntdll.dll!NtDuplicateObject
  • ntdll.dll!NtEnumerateKey
  • ntdll.dll!NtEnumerateValueKey
  • ntdll.dll!NtFreeVirtualMemory
  • ntdll.dll!NtMapViewOfSection
  • ntdll.dll!NtOpenDirectoryObject
  • ntdll.dll!NtOpenEvent
  • ntdll.dll!NtOpenFile
  • ntdll.dll!NtOpenKey
  • ntdll.dll!NtOpenKeyEx
  • ntdll.dll!NtOpenProcess
  • ntdll.dll!NtOpenProcessToken
  • ntdll.dll!NtOpenSection
  • ntdll.dll!NtOpenThreadToken
  • ntdll.dll!NtProtectVirtualMemory
  • ntdll.dll!NtQueryAttributesFile
  • ntdll.dll!NtQueryDefaultLocale
  • ntdll.dll!NtQueryDirectoryFileEx
  • ntdll.dll!NtQueryFullAttributesFile
  • ntdll.dll!NtQueryInformationFile
  • ntdll.dll!NtQueryInformationJobObject
  • ntdll.dll!NtQueryInformationProcess
  • ntdll.dll!NtQueryInformationThread
  • ntdll.dll!NtQueryInformationToken
  • ntdll.dll!NtQueryKey
  • ntdll.dll!NtQueryLicenseValue
  • ntdll.dll!NtQueryPerformanceCounter
  • ntdll.dll!NtQuerySecurityAttributesToken
  • ntdll.dll!NtQuerySecurityObject
  • ntdll.dll!NtQuerySystemInformation
  • ntdll.dll!NtQuerySystemInformationEx
  • ntdll.dll!NtQueryValueKey
  • ntdll.dll!NtQueryVirtualMemory
  • ntdll.dll!NtQueryVolumeInformationFile
  • ntdll.dll!NtQueryWnfStateData
  • ntdll.dll!NtReadFile
  • ntdll.dll!NtReadRequestData
  • ntdll.dll!NtReleaseMutant
  • ntdll.dll!NtReleaseWorkerFactoryWorker
  • ntdll.dll!NtRequestWaitReplyPort
  • ntdll.dll!NtResumeThread
  • ntdll.dll!NtSetEvent
  • ntdll.dll!NtSetInformationKey
  • ntdll.dll!NtSetInformationProcess
  • ntdll.dll!NtSetInformationThread
  • ntdll.dll!NtSetInformationVirtualMemory
  • ntdll.dll!NtSetInformationWorkerFactory
  • ntdll.dll!NtSubscribeWnfStateChange
  • ntdll.dll!NtTestAlert
  • ntdll.dll!NtTraceControl
  • ntdll.dll!NtUnmapViewOfSection
  • ntdll.dll!NtUnmapViewOfSectionEx
  • ntdll.dll!NtWaitForAlertByThreadId
  • ntdll.dll!NtWaitForMultipleObjects
  • ntdll.dll!NtWaitForSingleObject
  • ntdll.dll!NtWaitForWorkViaWorkerFactory
  • ntdll.dll!NtWaitLowEventPair
  • ntdll.dll!NtWorkerFactoryWorkerReady
  • ntdll.dll!NtWriteFile
  • ntdll.dll!NtYieldExecution
  • UNKNOWN
User Data Access
  • GetComputerNameEx
  • GetUserDefaultLocaleName
  • GetUserObjectInformation
Other Suspicious
  • AdjustTokenPrivileges
Anti Debug
  • IsDebuggerPresent
Encryption Used
  • BCryptOpenAlgorithmProvider
  • CryptAcquireContext

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