Analysis

  • max time kernel
    120s
  • max time network
    97s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20241007-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
  • submitted
    29/11/2024, 04:06

General

  • Target
    b4d6eaa6fb791e405cc9f5831932251bcb98cdd07cab88d4e09285648914e63fN.exe
  • Size 614KB
  • Sample241129-epdcpszpaj
  • SHA256 b4d6eaa6fb791e405cc9f5831932251bcb98cdd07cab88d4e09285648914e63f
  • 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 5 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 2 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 2 IoCs
  • System policy modification 1 TTPs 2 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\b4d6eaa6fb791e405cc9f5831932251bcb98cdd07cab88d4e09285648914e63fN.exe
    "C:\Users\Admin\AppData\Local\Temp\b4d6eaa6fb791e405cc9f5831932251bcb98cdd07cab88d4e09285648914e63fN.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:1072
  • 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
    • 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:3724
  • 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:4872
  • C:\Program Files (x86)\Mozilla Maintenance Service\maintenanceservice.exe
    "C:\Program Files (x86)\Mozilla Maintenance Service\maintenanceservice.exe"
    1⤵
    • Executes dropped EXE
    • Drops file in Program Files directory
    PID:4276
  • \??\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
    PID:2032
  • C:\Windows\System32\OpenSSH\ssh-agent.exe
    C:\Windows\System32\OpenSSH\ssh-agent.exe
    1⤵
    • Executes dropped EXE
    PID:1816

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 2b25cdc90e71316dcce9cf7fefc77de0a608f28a22d5ee827da1e016235e966d
        • MD5 SHA1 SHA512 SSDEEP

        maintenanceservice.exe

        • Path C:\Program Files (x86)\Mozilla Maintenance Service\maintenanceservice.exe
        • Size 781KB
        • SHA256 af03e20c6e41699a6dcc538dec8ac5f47c34af14a6ec6035af7f2af82520a43e
        • MD5 SHA1 SHA512 SSDEEP

        7z.exe

        • Path C:\Program Files\7-Zip\7z.exe
        • Size 1.1MB
        • SHA256 2ccb3e613850dd5722abb6f82ca6110aa9f1e754d789f68f82814fe4d52e24ae
        • MD5 SHA1 SHA512 SSDEEP

        7zFM.exe

        • Path C:\Program Files\7-Zip\7zFM.exe
        • Size 1.5MB
        • SHA256 e8580b901eb9f5300e2322ab305d957c911cd3538002d650596ceb4df7ee3fae
        • MD5 SHA1 SHA512 SSDEEP

        7zG.exe

        • Path C:\Program Files\7-Zip\7zG.exe
        • Size 1.2MB
        • SHA256 9107151a26f30c9a9beba23266d7f28d11ac5ec291a155cd6ca8db5b9bf4f74d
        • MD5 SHA1 SHA512 SSDEEP

        AppVShNotify.exe

        • Path C:\Program Files\Common Files\microsoft shared\ClickToRun\AppVShNotify.exe
        • Size 832KB
        • SHA256 5a4a341e7431431adac6d45b408815312c7cd8f46c195cbd564a94914133a1e8
        • MD5 SHA1 SHA512 SSDEEP

        IntegratedOffice.exe

        • Path C:\Program Files\Common Files\microsoft shared\ClickToRun\IntegratedOffice.exe
        • Size 4.6MB
        • SHA256 f717da8d3e7d0220652cf6efb542701e502ea2d8cfa9e03772808a5a95e68fdb
        • MD5 SHA1 SHA512 SSDEEP

        MavInject32.exe

        • Path C:\Program Files\Common Files\microsoft shared\ClickToRun\MavInject32.exe
        • Size 898KB
        • SHA256 0c3a100a039dbdd2121c1ae58ac79b2dbf68292afc2791b60c2bdf798fbd3865
        • MD5 SHA1 SHA512 SSDEEP

        OfficeC2RClient.exe

        • Path C:\Program Files\Common Files\microsoft shared\ClickToRun\OfficeC2RClient.exe
        • Size 24.0MB
        • SHA256 c2a7403952eb48a495514090d7e1b48e78c99b5743ac90a18b92d4a931d412e2
        • MD5 SHA1 SHA512 SSDEEP

        appvcleaner.exe

        • Path C:\Program Files\Common Files\microsoft shared\ClickToRun\appvcleaner.exe
        • Size 2.7MB
        • SHA256 26c12715bfabe05353f91a41e8e81099ffbc4b77f1961876fd8a96f04dfac02d
        • MD5 SHA1 SHA512 SSDEEP

        OSE.EXE

        • Path C:\Program Files\Common Files\microsoft shared\Source Engine\OSE.EXE
        • Size 797KB
        • SHA256 422fb14bf7d675474d954d088159e2ba6b328d2ec6cff4bc406e85c5d35e01b6
        • MD5 SHA1 SHA512 SSDEEP

        cpkcoelj.tmp

        • Path C:\Program Files\Google\Chrome\Application\123.0.6312.123\Installer\cpkcoelj.tmp
        • Size 4.6MB
        • SHA256 c1546e5355e43e7f94391e7bd4004d55147b0033e8f6adea84eb4dd8643dd44d
        • 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 451322b08e1d4114491177b6cfe300d45fc5c735e72ea63c3a93bf8831731ccf
        • MD5 SHA1 SHA512 SSDEEP

        iexplore.exe

        • Path C:\Program Files\Internet Explorer\iexplore.exe
        • Size 1.3MB
        • SHA256 1b214ed62471e00a3dae9c79df716b96955cf5172e57648df1d6d3217c4d0722
        • MD5 SHA1 SHA512 SSDEEP

        powershell.exe

        • Path C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
        • Size 978KB
        • SHA256 c178af291c2c7c7eb3b335e0f240ef26da4caa736ef4e8ebbb82b3b17ea344cc
        • MD5 SHA1 SHA512 SSDEEP

        ssh-agent.exe

        • Path C:\Windows\System32\OpenSSH\ssh-agent.exe
        • Size 932KB
        • SHA256 7983e9471157da0eb7f123220e95fa7b264c5a2b1f0080c66c940735951112a9
        • MD5 SHA1 SHA512 SSDEEP

        enfpcnji.tmp

        • Path C:\Windows\System32\enfpcnji.tmp
        • Size 1.3MB
        • SHA256 f6e0cb49e151811bfe18fd506f65342314b22edc6b82fae88f940ff657837b11
        • MD5 SHA1 SHA512 SSDEEP

        wmpnetwk.exe

        • Path \??\c:\program files\windows media player\wmpnetwk.exe
        • Size 1.5MB
        • SHA256 24c64776fafecd41af9bb19f016151fa31bfc76edc6f1abab83c8c47c1db0411
        • MD5 SHA1 SHA512 SSDEEP

        Agentservice.exe

        • Path \??\c:\windows\system32\Agentservice.exe
        • Size 1.7MB
        • SHA256 8c71df38ead72901016ff6141615e9a6e70dd512f0cba3300475bbdd505c1164
        • MD5 SHA1 SHA512 SSDEEP

        fxssvc.exe

        • Path \??\c:\windows\system32\fxssvc.exe
        • Size 1.2MB
        • SHA256 fc388b86334d7668e03273aa904c87305a4d5d8e84f11a163e0e80f09b000927
        • MD5 SHA1 SHA512 SSDEEP

        msdtc.exe

        • Path \??\c:\windows\system32\msdtc.exe
        • Size 700KB
        • SHA256 0642ef0c466b8ddd6102066c79c912632782771ecceacb2a94226e78119754dc
        • MD5 SHA1 SHA512 SSDEEP

        msiexec.exe

        • Path \??\c:\windows\system32\msiexec.exe
        • Size 623KB
        • SHA256 721891dc91578c2662df2bdb99fab38562ffadb8a96014e7442dd16e5046e601
        • MD5 SHA1 SHA512 SSDEEP

        snmptrap.exe

        • Path \??\c:\windows\system32\snmptrap.exe
        • Size 572KB
        • SHA256 aaa986db292e5062f60e151c6ebf178ab2a87933cc78089d554a40f0a3e7bf60
        • MD5 SHA1 SHA512 SSDEEP

        wbengine.exe

        • Path \??\c:\windows\system32\wbengine.exe
        • Size 2.1MB
        • SHA256 f935f2165cd161e7175565efdfcb03cf99fde93e0c5713674da6b8cabf6730ed
        • MD5 SHA1 SHA512 SSDEEP

        memory/1072-2-0x0000000000400000-0x0000000000658000-memory.dmp

        memory/1072-1-0x0000000000407000-0x0000000000408000-memory.dmp

        memory/1072-0-0x0000000000400000-0x0000000000658000-memory.dmp

        memory/1816-172-0x0000000140000000-0x00000001402E6000-memory.dmp

        memory/1816-74-0x0000000140000000-0x00000001402E6000-memory.dmp

        memory/2032-161-0x0000000140000000-0x00000001402B3000-memory.dmp

        memory/2032-155-0x0000000140000000-0x00000001402B3000-memory.dmp

        memory/2032-62-0x0000000140000000-0x00000001402B3000-memory.dmp

        memory/2032-61-0x0000000140000000-0x00000001402B3000-memory.dmp

        memory/3724-117-0x0000000140000000-0x0000000140418000-memory.dmp

        memory/3724-21-0x00000001400B2000-0x00000001400B3000-memory.dmp

        memory/3724-20-0x0000000140000000-0x0000000140418000-memory.dmp

        memory/4276-59-0x0000000140000000-0x00000001402B3000-memory.dmp

        memory/4276-36-0x0000000140000000-0x00000001402B3000-memory.dmp

        memory/4276-37-0x0000000140000000-0x00000001402B3000-memory.dmp

        memory/4872-118-0x0000000140000000-0x000000014040F000-memory.dmp

        memory/4872-29-0x0000000140000000-0x000000014040F000-memory.dmp

        memory/4872-28-0x0000000140000000-0x000000014040F000-memory.dmp