Analysis

  • max time kernel
    149s
  • max time network
    145s
  • platform
    windows11-21h2_x64
  • resource
    win11-20260130-en
  • resource tags

    arch:x64arch:x86image:win11-20260130-enlocale:en-usos:windows11-21h2-x64systemwindows
  • submitted
    15/04/2026, 12:15

General

  • Target
    YandexPackSetup.exe
  • Size 10.1MB
  • Sample260415-pfbgvsdv9m
  • SHA256 ead7a779cabae642d09be07283cc99e53c84ecf90349444e0d0ac4bf9901fe47
  • MD5 SHA1 SHA512 SSDEEP TLSH

Malware Config

Signatures

  • Executes dropped EXE 4 IoCs
  • Loads dropped DLL 10 IoCs
  • Reads user/profile data of web browsers 3 TTPs

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

  • Checks installed software on the system 1 TTPs

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

  • Enumerates connected drives 3 TTPs 46 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 Windows directory 21 IoCs
  • Browser Information Discovery 1 TTPs

    Enumerate browser information.

  • Enumerates physical storage devices 1 TTPs

    Attempts to interact with connected storage/optical drive(s).

  • System Location Discovery: System Language Discovery 1 TTPs 6 IoCs

    Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

  • Modifies Internet Explorer settings 1 TTPs 2 IoCs
  • Modifies system certificate store 2 TTPs 8 IoCs
  • Suspicious behavior: EnumeratesProcesses 14 IoCs
  • Suspicious use of AdjustPrivilegeToken 60 IoCs
  • Suspicious use of FindShellTrayWindow 2 IoCs
  • Suspicious use of WriteProcessMemory 4 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\YandexPackSetup.exe
    "C:\Users\Admin\AppData\Local\Temp\YandexPackSetup.exe"
    1⤵
    • Enumerates connected drives
    • System Location Discovery: System Language Discovery
    • Modifies system certificate store
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of FindShellTrayWindow
    PID:5196
  • C:\Windows\system32\msiexec.exe
    C:\Windows\system32\msiexec.exe /V
    1⤵
    • Enumerates connected drives
    • Drops file in Windows directory
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:3368
    • C:\Windows\syswow64\MsiExec.exe
      C:\Windows\syswow64\MsiExec.exe -Embedding 79B9A06832F9C9880A455767659E1174
      2⤵
      • Loads dropped DLL
      • System Location Discovery: System Language Discovery
      • Suspicious use of WriteProcessMemory
      PID:3572
      • C:\Users\Admin\AppData\Local\Temp\FAB33C42-2C50-4F95-86F2-B36E9A0945C1\lite_installer.exe
        "C:\Users\Admin\AppData\Local\Temp\FAB33C42-2C50-4F95-86F2-B36E9A0945C1\lite_installer.exe" --use-user-default-locale --silent --cumtom-welcome-page=https://browser.yandex.ru/promo/welcome_com/5/
        3⤵
        • Executes dropped EXE
        • System Location Discovery: System Language Discovery
        • Suspicious behavior: EnumeratesProcesses
        PID:3016
      • C:\Users\Admin\AppData\Local\Temp\72578DDB-6355-4205-9524-48A558EECFBF\seederexe.exe
        "C:\Users\Admin\AppData\Local\Temp\72578DDB-6355-4205-9524-48A558EECFBF\seederexe.exe" "--yqs=" "--yhp=" "--ilight=" "--oem=" "--nopin=n" "--pin_custom=n" "--pin_desktop=n" "--pin_taskbar=y" "--locale=us" "--browser=" "--browser_default=" "--loglevel=trace" "--ess=" "--clids=C:\Users\Admin\AppData\Local\Temp\clids-yasearch.xml" "--sender=C:\Users\Admin\AppData\Local\Temp\71243359-B0D0-46F5-BA24-1623610E5E4C\sender.exe" "--is_elevated=yes" "--ui_level=5" "--good_token=x" "--no_opera=n"
        3⤵
        • Executes dropped EXE
        • System Location Discovery: System Language Discovery
        • Modifies Internet Explorer settings
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of WriteProcessMemory
        PID:2752
        • C:\Users\Admin\AppData\Local\Temp\71243359-B0D0-46F5-BA24-1623610E5E4C\sender.exe
          C:\Users\Admin\AppData\Local\Temp\71243359-B0D0-46F5-BA24-1623610E5E4C\sender.exe --send "/status.xml?clid=6035492&uuid=23a0c8f8-4a7f-4963-8c65-fa6659c5a5b3&vnt=Windows 11x64&file-no=8%0A15%0A25%0A45%0A57%0A59%0A102%0A111%0A125%0A"
          4⤵
          • Executes dropped EXE
          • Drops file in System32 directory
          • System Location Discovery: System Language Discovery
          • Suspicious behavior: EnumeratesProcesses
          PID:1700
  • C:\Users\Admin\AppData\Local\Temp\71243359-B0D0-46F5-BA24-1623610E5E4C\sender.exe
    "C:\Users\Admin\AppData\Local\Temp\71243359-B0D0-46F5-BA24-1623610E5E4C\sender.exe" --job-name=ySenderExe-{0C88EA27-2083-4062-B24F-0A9C9F065D91} --local-path=C:\Users\Admin\AppData\Local\Temp\yst.tmp --send="/status.xml?clid=6035492&uuid=23a0c8f8-4a7f-4963-8c65-fa6659c5a5b3&vnt=Windows 11x64&file-no=8%0A15%0A25%0A45%0A57%0A59%0A102%0A111%0A125"
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    • Suspicious behavior: EnumeratesProcesses
    PID:9308

Network

        MITRE ATT&CK Enterprise v16

        Replay Monitor

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        Downloads

        e57e88c.rbs

        • Path C:\Config.Msi\e57e88c.rbs
        • Size 580B
        • SHA256 f8ab5b892e31c7107d5b849c8034386442da8428b6dcf620e55ff42a1350fac3
        • MD5 SHA1 SHA512 TLSH

        357F04AD41BCF5FE18FCB69F60C6680F_394487CAFBCFB8C5917AD7A10924C8A7

        • Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\357F04AD41BCF5FE18FCB69F60C6680F_394487CAFBCFB8C5917AD7A10924C8A7
        • Size 1KB
        • SHA256 7fe9b3c538fa6c1cac4a8cf7dfedd6ac4abd1c7532d720e32cabd7de6244af38
        • MD5 SHA1 SHA512 TLSH

        9CB4373A4252DE8D2212929836304EC5_1AB74AA2E3A56E1B8AD8D3FEC287554E

        • Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\9CB4373A4252DE8D2212929836304EC5_1AB74AA2E3A56E1B8AD8D3FEC287554E
        • Size 1KB
        • SHA256 b4f0b11e06aba5b62a455912bb98591cbd9a100f0c2a5bbdc3e84a29db023117
        • MD5 SHA1 SHA512 TLSH

        357F04AD41BCF5FE18FCB69F60C6680F_394487CAFBCFB8C5917AD7A10924C8A7

        • Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\357F04AD41BCF5FE18FCB69F60C6680F_394487CAFBCFB8C5917AD7A10924C8A7
        • Size 536B
        • SHA256 218a59fee7a5b081c19c25553ae5da2f4ffb118d67136ddfcdc523d36bfcd6fb
        • MD5 SHA1 SHA512 TLSH

        9CB4373A4252DE8D2212929836304EC5_1AB74AA2E3A56E1B8AD8D3FEC287554E

        • Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\9CB4373A4252DE8D2212929836304EC5_1AB74AA2E3A56E1B8AD8D3FEC287554E
        • Size 536B
        • SHA256 e07bdc181b29fc8de08add7289ba53052f12cf063453d19a9641b0bbd0bd65a4
        • MD5 SHA1 SHA512 TLSH

        sender.exe

        • Path C:\Users\Admin\AppData\Local\Temp\71243359-B0D0-46F5-BA24-1623610E5E4C\sender.exe
        • Size 260KB
        • SHA256 36022c6ecb3426791e6edee9074a3861fe5b660d98f2b2b7c13b80fe11a75577
        • MD5 SHA1 SHA512 SSDEEP TLSH

        seederexe.exe

        • Path C:\Users\Admin\AppData\Local\Temp\72578DDB-6355-4205-9524-48A558EECFBF\seederexe.exe
        • Size 8.6MB
        • SHA256 35585d12899435e13e186490fcf1d270adbe3c74a1e0578b3d9314858bf2d797
        • MD5 SHA1 SHA512 SSDEEP TLSH

        lite_installer.exe

        • Path C:\Users\Admin\AppData\Local\Temp\FAB33C42-2C50-4F95-86F2-B36E9A0945C1\lite_installer.exe
        • Size 419KB
        • SHA256 688d0b782437ccfae2944281ade651a2da063f222e80b3510789dbdce8b00fdc
        • MD5 SHA1 SHA512 SSDEEP TLSH

        YandexSearch00000.log

        • Path C:\Users\Admin\AppData\Local\Temp\YandexSearch00000.log
        • Size 34KB
        • SHA256 452d289314d941b3d7cb7b638ab0086fc8bf1c8493d084e4a30bfeaa0ab5d329
        • MD5 SHA1 SHA512 SSDEEP TLSH

        clids-yasearch.xml

        • Path C:\Users\Admin\AppData\Local\Temp\clids-yasearch.xml
        • Size 531B
        • SHA256 081acaf053b713ef777e8d87a0760aeafb97a1e4b0fe8bd1cd631401ac90c7e1
        • MD5 SHA1 SHA512 TLSH

        omnija-20261615.zip

        • Path C:\Users\Admin\AppData\Local\Temp\omnija-20261615.zip
        • Size 45.1MB
        • SHA256 7d5072b7fa0880c245cb54a627474b67df7b4f3f33a7ae828b39417f9621eef0
        • MD5 SHA1 SHA512 SSDEEP TLSH

        tmp2752aaaaaa

        • Path C:\Users\Admin\AppData\Local\Temp\tmp2752aaaaaa
        • Size 2.5MB
        • SHA256 74d5e8d3cd8d659d8df8e6f306832dfc252e1a6e676bb60334e31b5943deb4fb
        • MD5 SHA1 SHA512 SSDEEP TLSH

        vendor00000.xml

        • Path C:\Users\Admin\AppData\Local\Temp\vendor00000.xml
        • Size 510B
        • SHA256 1a855972dc308e47d30d567e1b37fdad349bf555b971bc14ead76e17a8accccc
        • MD5 SHA1 SHA512 TLSH

        YandexSearch.msi

        • Path C:\Users\Admin\AppData\Local\Temp\{5B964E0E-B9A3-4276-9ED9-4D5A5720747A}\YandexSearch.msi
        • Size 9.8MB
        • SHA256 b2fda5fb2d8e65fc0448d308647d8afd1e4ecd7bff0103ec3700e0798a7db0a3
        • MD5 SHA1 SHA512 SSDEEP TLSH

        places.sqlite-20260415121630.908532.backup

        • Path C:\Users\Admin\AppData\Roaming\Mozilla\Firefox\Profiles\94s8sulr.Admin\places.sqlite-20260415121630.908532.backup
        • Size 68KB
        • SHA256 b6d278384a3684409a2a86f03e4f52869818ce7dd8b5779876960353f7d35dc1
        • MD5 SHA1 SHA512 SSDEEP TLSH

        Bookmarks-20260415121631.236690.backup

        • Path C:\Users\Admin\AppData\Roaming\Opera Software\Opera Stable\Bookmarks-20260415121631.236690.backup
        • Size 1KB
        • SHA256 2b167248e8136c4d45c2c46e2bff6fb5e5137dd4dfdccde998599be2df2e9335
        • MD5 SHA1 SHA512 TLSH

        Preferences-20260415121631.236690.backup

        • Path C:\Users\Admin\AppData\Roaming\Opera Software\Opera Stable\Preferences-20260415121631.236690.backup
        • Size 313B
        • SHA256 ed6a32e11cc99728771989b01f5ae813de80c46a59d3dc68c23a4671a343cb8c
        • MD5 SHA1 SHA512 TLSH

        ui

        • Path C:\Users\Admin\AppData\Roaming\Yandex\ui
        • Size 38B
        • SHA256 0d6ee21913f753c595cb4ad36fb40812d485042a46c3f79a8f91d6345ab788c7
        • MD5 SHA1 SHA512

        MSIE985.tmp

        • Path C:\Windows\Installer\MSIE985.tmp
        • Size 181KB
        • SHA256 a5dd2f97c6787c335b7807ff9b6966877e9dd811f9e26326837a7d2bd224de86
        • MD5 SHA1 SHA512 SSDEEP TLSH

        MSIEA22.tmp

        • Path C:\Windows\Installer\MSIEA22.tmp
        • Size 189KB
        • SHA256 669cc0aae068ced3154acaecb0c692c4c5e61bc2ca95b40395a3399e75fcb9b2
        • MD5 SHA1 SHA512 SSDEEP TLSH

        memory/1700-9089-0x0000000002D20000-0x0000000002DE1000-memory.dmp

        memory/1700-9093-0x0000000002D20000-0x0000000002DE1000-memory.dmp

        memory/2752-9084-0x0000000002DD0000-0x0000000002E91000-memory.dmp

        memory/3016-9087-0x00000000026F0000-0x00000000027B1000-memory.dmp

        memory/3368-9088-0x000002709B740000-0x000002709B74C000-memory.dmp

        memory/5196-207-0x0000000002CF0000-0x0000000002DB1000-memory.dmp

        memory/9308-9096-0x00000000024E0000-0x00000000025A1000-memory.dmp