Analysis

  • max time kernel
    120s
  • max time network
    102s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20241007-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
  • submitted
    04/01/2025, 04:49

General

  • Target
    704dad95667ccdb58d605fa9c12bb85f1416a8eb3c48c2897b87e0c72193f0caN.exe
  • Size 614KB
  • Sample250104-ffxknaspfs
  • SHA256 704dad95667ccdb58d605fa9c12bb85f1416a8eb3c48c2897b87e0c72193f0ca
  • MD5 SHA1 SHA512 SSDEEP

Malware Config

Signatures

  • Expiro family
  • Expiro, m0yv

    Expiro aka m0yv is a multi-functional backdoor written in C++.

  • Expiro payload 1 IoCs
  • Disables taskbar notifications via registry modification
  • Executes dropped EXE 8 IoCs
  • Reads user/profile data of web browsers 3 TTPs

    Infostealers often target stored browser data, which can include saved credentials etc.

  • Unsecured Credentials: Credentials In Files 1 TTPs

    Steal credentials from unsecured files.

  • Windows security modification 2 TTPs 2 IoCs
  • Checks installed software on the system 1 TTPs

    Looks up Uninstall key entries in the registry to enumerate software on the system.

  • Drops Chrome extension 1 IoCs
  • Enumerates connected drives 3 TTPs 42 IoCs

    Attempts to read the root path of hard drives other than the default C: drive.

  • Drops file in System32 directory 64 IoCs
  • Drops file in Program Files directory 64 IoCs
  • Drops file in Windows directory 5 IoCs
  • 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.

  • Suspicious behavior: EnumeratesProcesses 34 IoCs
  • Suspicious behavior: LoadsDriver 2 IoCs
  • Suspicious use of AdjustPrivilegeToken 6 IoCs
  • System policy modification 1 TTPs 2 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\704dad95667ccdb58d605fa9c12bb85f1416a8eb3c48c2897b87e0c72193f0caN.exe
    "C:\Users\Admin\AppData\Local\Temp\704dad95667ccdb58d605fa9c12bb85f1416a8eb3c48c2897b87e0c72193f0caN.exe"
    1⤵
    • Drops Chrome extension
    • Enumerates connected drives
    • Drops file in System32 directory
    • Drops file in Program Files directory
    • Drops file in Windows directory
    • System Location Discovery: System Language Discovery
    • Suspicious use of AdjustPrivilegeToken
    PID:4952
  • C:\Program Files\Google\Chrome\Application\123.0.6312.123\elevation_service.exe
    "C:\Program Files\Google\Chrome\Application\123.0.6312.123\elevation_service.exe"
    1⤵
    • Executes dropped EXE
    PID:2212
  • C:\Program Files (x86)\Microsoft\Edge\Application\92.0.902.67\elevation_service.exe
    "C:\Program Files (x86)\Microsoft\Edge\Application\92.0.902.67\elevation_service.exe"
    1⤵
    • Executes dropped EXE
    PID:668
  • C:\Program Files (x86)\Mozilla Maintenance Service\maintenanceservice.exe
    "C:\Program Files (x86)\Mozilla Maintenance Service\maintenanceservice.exe"
    1⤵
    • Executes dropped EXE
    PID:1508
  • \??\c:\Program Files\Common Files\Microsoft Shared\Source Engine\OSE.EXE
    "c:\Program Files\Common Files\Microsoft Shared\Source Engine\OSE.EXE"
    1⤵
    • Executes dropped EXE
    • Windows security modification
    • Enumerates connected drives
    • Drops file in System32 directory
    • Drops file in Program Files directory
    • Drops file in Windows directory
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • System policy modification
    PID:1308
  • C:\Windows\System32\OpenSSH\ssh-agent.exe
    C:\Windows\System32\OpenSSH\ssh-agent.exe
    1⤵
    • Executes dropped EXE
    PID:2428
  • C:\Windows\system32\AgentService.exe
    C:\Windows\system32\AgentService.exe
    1⤵
    • Executes dropped EXE
    • Suspicious use of AdjustPrivilegeToken
    PID:788
  • C:\Windows\servicing\TrustedInstaller.exe
    C:\Windows\servicing\TrustedInstaller.exe
    1⤵
    • Executes dropped EXE
    • Drops file in Windows directory
    PID:4308
  • C:\Windows\system32\wbengine.exe
    "C:\Windows\system32\wbengine.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of AdjustPrivilegeToken
    PID:4048

Network

        MITRE ATT&CK Enterprise v15

        Replay Monitor

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        Downloads

        elevation_service.exe

        • Path C:\Program Files (x86)\Microsoft\Edge\Application\92.0.902.67\elevation_service.exe
        • Size 2.1MB
        • SHA256 35e1f16baef17590c4f3ba59d5ed0a88c4d7bc883da61a3dbe4a561534292311
        • MD5 SHA1 SHA512 SSDEEP

        maintenanceservice.exe

        • Path C:\Program Files (x86)\Mozilla Maintenance Service\maintenanceservice.exe
        • Size 777KB
        • SHA256 69e425bf4451b01409b5dcb70f8d743fdd81b0f8b0aa958d0d82b2b07ad12c46
        • MD5 SHA1 SHA512 SSDEEP

        7z.exe

        • Path C:\Program Files\7-Zip\7z.exe
        • Size 1.1MB
        • SHA256 ab1e912eb500768c8074d6bbf44bf2f48ec5891c88b76fcfba5f7e9602e72cc8
        • MD5 SHA1 SHA512 SSDEEP

        7zFM.exe

        • Path C:\Program Files\7-Zip\7zFM.exe
        • Size 1.4MB
        • SHA256 1d0ce0ff857ef803d7795146e4aaee3dc85dedfefd3b6a1fd856e2a89d0762ab
        • MD5 SHA1 SHA512 SSDEEP

        7zG.exe

        • Path C:\Program Files\7-Zip\7zG.exe
        • Size 1.2MB
        • SHA256 aaf67fe0a1a0d90da276054b3112969d52d2dbf218fba782dc409346a9dd57bf
        • MD5 SHA1 SHA512 SSDEEP

        Uninstall.exe

        • Path C:\Program Files\7-Zip\Uninstall.exe
        • Size 566KB
        • SHA256 3b1031e75d96526e3c5386762b0a2c88c18ae54db2367af00f99744034efaebe
        • MD5 SHA1 SHA512 SSDEEP

        AppVShNotify.exe

        • Path C:\Program Files\Common Files\microsoft shared\ClickToRun\AppVShNotify.exe
        • Size 828KB
        • SHA256 27b42865fa53809fc74696ef82fc195fd57b991df258be681792a0773cf13d84
        • MD5 SHA1 SHA512 SSDEEP

        IntegratedOffice.exe

        • Path C:\Program Files\Common Files\microsoft shared\ClickToRun\IntegratedOffice.exe
        • Size 4.6MB
        • SHA256 756acba24aea0358af886677f6b23feec25b6d1b0c73ae3d644213b8e5f5a5a0
        • MD5 SHA1 SHA512 SSDEEP

        MavInject32.exe

        • Path C:\Program Files\Common Files\microsoft shared\ClickToRun\MavInject32.exe
        • Size 898KB
        • SHA256 28bb7a96624edf73e51486cba057a5b420b98a6ead937844a9a1d2331a2f5a07
        • MD5 SHA1 SHA512 SSDEEP

        OfficeC2RClient.exe

        • Path C:\Program Files\Common Files\microsoft shared\ClickToRun\OfficeC2RClient.exe
        • Size 24.0MB
        • SHA256 04a4934eb44d1d286cceb7906fa4ad50fa6405fd4f5af753cd95327e857904c4
        • MD5 SHA1 SHA512 SSDEEP

        appvcleaner.exe

        • Path C:\Program Files\Common Files\microsoft shared\ClickToRun\appvcleaner.exe
        • Size 2.7MB
        • SHA256 37f6f65b58dab7d03d4de2150436280b60b79f4df8f72b787c7c62386aea8d47
        • MD5 SHA1 SHA512 SSDEEP

        OSE.EXE

        • Path C:\Program Files\Common Files\microsoft shared\Source Engine\OSE.EXE
        • Size 793KB
        • SHA256 65b75e13bee68c6e8b557b27d0a272d9d1960ba9febd31d1a6e298c8b9c08d94
        • MD5 SHA1 SHA512 SSDEEP

        bhlnifll.tmp

        • Path C:\Program Files\Google\Chrome\Application\123.0.6312.123\Installer\bhlnifll.tmp
        • Size 4.6MB
        • SHA256 5ca51d5238641f1c332ed2514ad9738600bf1167ad78e2f94ebbf49141c88c44
        • MD5 SHA1 SHA512 SSDEEP

        elevation_service.exe

        • Path C:\Program Files\Google\Chrome\Application\123.0.6312.123\elevation_service.exe
        • Size 2.1MB
        • SHA256 f8930ca6915a081ccac48ec9038d8bbabc9db5a27c22d2ec5004b459b1b8f1f4
        • MD5 SHA1 SHA512 SSDEEP

        iexplore.exe

        • Path C:\Program Files\Internet Explorer\iexplore.exe
        • Size 1.3MB
        • SHA256 c341fc4776292e2ff314946f94e211850b71f93d193427fbc3c35be245884728
        • MD5 SHA1 SHA512 SSDEEP

        powershell.exe

        • Path C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
        • Size 978KB
        • SHA256 8ddf7576700c76ab5fd5c0da0b2e65fde4f272813776a8bf5dfb9be06d55a783
        • MD5 SHA1 SHA512 SSDEEP

        AgentService.exe

        • Path C:\Windows\System32\AgentService.exe
        • Size 1.7MB
        • SHA256 dc89fa6307619839a1969740eddbeeed94b6944d91e8c7ecbf1a4efa6669f469
        • MD5 SHA1 SHA512 SSDEEP

        ssh-agent.exe

        • Path C:\Windows\System32\OpenSSH\ssh-agent.exe
        • Size 928KB
        • SHA256 ce1a65e00dd613e9fd783ec5f18e58e00c5defbba739e13ce21a6e6fde54b2ee
        • MD5 SHA1 SHA512 SSDEEP

        jnaakooh.tmp

        • Path C:\Windows\System32\jnaakooh.tmp
        • Size 1.3MB
        • SHA256 44b366a231af126eb7deedd66bc635dce37ee819d6b18f7c4935d33518db9fa2
        • MD5 SHA1 SHA512 SSDEEP

        wbengine.exe

        • Path C:\Windows\System32\wbengine.exe
        • Size 2.1MB
        • SHA256 48374957b820baccab8f205780583bd4895e816ae19366a4ee03cdff39ea8063
        • MD5 SHA1 SHA512 SSDEEP

        TrustedInstaller.exe

        • Path C:\Windows\servicing\TrustedInstaller.exe
        • Size 193KB
        • SHA256 73684e31ad4afe3fdc525b51ccaacc14d402c92db9c42e3fcbfe1e65524b1c01
        • MD5 SHA1 SHA512 SSDEEP

        wmpnetwk.exe

        • Path \??\c:\program files\windows media player\wmpnetwk.exe
        • Size 1.5MB
        • SHA256 3cb5cc5834db8a0159eb060a0938f0e098c7319a72c71c14dbbba8a775a20fad
        • MD5 SHA1 SHA512 SSDEEP

        fxssvc.exe

        • Path \??\c:\windows\system32\fxssvc.exe
        • Size 1.2MB
        • SHA256 5804d0ad7dd6a4c6024908ae93916efa173143eb65541860bbc87662d0dfa7b7
        • MD5 SHA1 SHA512 SSDEEP

        msdtc.exe

        • Path \??\c:\windows\system32\msdtc.exe
        • Size 700KB
        • SHA256 588865e9ef8622495c783047eb8f1b516af003d5ce7335d49b1fee709faa8e53
        • MD5 SHA1 SHA512 SSDEEP

        msiexec.exe

        • Path \??\c:\windows\system32\msiexec.exe
        • Size 623KB
        • SHA256 80ed69297478f450455fd8de0cf964ada9e9e50bb9a4fa37eda33fdb3b0d74e0
        • MD5 SHA1 SHA512 SSDEEP

        snmptrap.exe

        • Path \??\c:\windows\system32\snmptrap.exe
        • Size 572KB
        • SHA256 6c02f259d04272cb1f37e18d1b5d47f041e9279956d75d7c9648c51b4ea31dff
        • MD5 SHA1 SHA512 SSDEEP

        memory/668-29-0x0000000140000000-0x0000000140384000-memory.dmp

        memory/668-28-0x0000000140000000-0x0000000140384000-memory.dmp

        memory/788-88-0x0000000140000000-0x0000000140319000-memory.dmp

        memory/788-81-0x0000000140000000-0x0000000140319000-memory.dmp

        memory/1308-60-0x0000000140015000-0x0000000140016000-memory.dmp

        memory/1308-150-0x0000000140000000-0x0000000140228000-memory.dmp

        memory/1308-59-0x0000000140000000-0x0000000140228000-memory.dmp

        memory/1508-36-0x0000000140000000-0x0000000140228000-memory.dmp

        memory/1508-37-0x0000000140000000-0x0000000140228000-memory.dmp

        memory/2212-20-0x0000000140000000-0x000000014038D000-memory.dmp

        memory/2212-21-0x0000000140000000-0x000000014038D000-memory.dmp

        memory/2428-73-0x0000000140000000-0x000000014025B000-memory.dmp

        memory/2428-172-0x0000000140000000-0x000000014025B000-memory.dmp

        memory/2428-74-0x0000000140000000-0x000000014025B000-memory.dmp

        memory/2428-171-0x0000000140000000-0x000000014025B000-memory.dmp

        memory/4048-183-0x0000000140000000-0x000000014036F000-memory.dmp

        memory/4048-90-0x0000000140000000-0x000000014036F000-memory.dmp

        memory/4952-0-0x0000000001000000-0x00000000011CE000-memory.dmp

        memory/4952-2-0x0000000001000000-0x00000000011CE000-memory.dmp

        memory/4952-1-0x0000000001002000-0x0000000001003000-memory.dmp