Analysis

  • max time kernel
    149s
  • max time network
    126s
  • platform
    windows7_x64
  • resource
    win7-20240221-en
  • resource tags

    arch:x64arch:x86image:win7-20240221-enlocale:en-usos:windows7-x64system
  • submitted
    08/04/2024, 03:51

General

  • Target
    $TEMP/MailRuSputnik_rfrletitbit2_s_mpcln9514_lite.exe
  • Size 3.8MB
  • Sample240408-eepyraga24
  • SHA256 da0e716af146e66e9e5aeeafc46ab2c2b81bc29fb800a2ac2816af537b03b240
  • MD5 SHA1 SHA512 SSDEEP

Malware Config

Signatures

  • Modifies Windows Firewall 2 TTPs 2 IoCs
  • Executes dropped EXE 4 IoCs
  • Loads dropped DLL 10 IoCs
  • Reads user/profile data of web browsers 2 TTPs

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

  • Adds Run key to start application 2 TTPs 1 IoCs
  • Checks installed software on the system 1 TTPs

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

  • Checks whether UAC is enabled 1 TTPs 2 IoCs
  • Installs/modifies Browser Helper Object 2 TTPs 2 IoCs

    BHOs are DLL modules which act as plugins for Internet Explorer.

  • Drops file in System32 directory 2 IoCs
  • Drops file in Program Files directory 6 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Modifies Internet Explorer settings 1 TTPs 27 IoCs
  • Modifies Internet Explorer start page 1 TTPs 1 IoCs
  • Modifies registry class 64 IoCs
  • Suspicious behavior: EnumeratesProcesses 64 IoCs
  • Suspicious use of WriteProcessMemory 20 IoCs
  • System policy modification 1 TTPs 1 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\$TEMP\MailRuSputnik_rfrletitbit2_s_mpcln9514_lite.exe
    "C:\Users\Admin\AppData\Local\Temp\$TEMP\MailRuSputnik_rfrletitbit2_s_mpcln9514_lite.exe"
    1⤵
    • Loads dropped DLL
    • Checks whether UAC is enabled
    • Installs/modifies Browser Helper Object
    • Drops file in Program Files directory
    • Modifies Internet Explorer settings
    • Modifies Internet Explorer start page
    • Modifies registry class
    • Suspicious use of WriteProcessMemory
    • System policy modification
    PID:2240
    • C:\Program Files (x86)\Mail.Ru\Sputnik\SputnikHelper.exe
      "C:\Program Files (x86)\Mail.Ru\Sputnik\SputnikHelper.exe" /RegServer
      2⤵
      • Executes dropped EXE
      • Modifies registry class
      PID:1996
    • C:\Windows\SysWOW64\netsh.exe
      "C:\Windows\System32\netsh.exe" firewall add allowedprogram "C:\Program Files (x86)\Mail.Ru\Sputnik\SputnikHelper.exe" "C:\Program Files (x86)\Mail.Ru\Sputnik\SputnikHelper.exe" ENABLE ALL
      2⤵
      • Modifies Windows Firewall
      PID:1712
    • C:\Windows\SysWOW64\netsh.exe
      "C:\Windows\System32\netsh.exe" firewall add allowedprogram "C:\Program Files (x86)\Mail.Ru\Sputnik\SputnikFlashPlayer.exe" "C:\Program Files (x86)\Mail.Ru\Sputnik\SputnikFlashPlayer.exe" ENABLE ALL
      2⤵
      • Modifies Windows Firewall
      PID:2344
    • C:\Users\Admin\AppData\Local\Temp\GuardMailRu.exe
      "C:\Users\Admin\AppData\Local\Temp\GuardMailRu.exe" /INSTALL2 /LANG=ru /GUID={3EE97002-F692-4364-9CF9-14804FE1A29B}
      2⤵
      • Executes dropped EXE
      • Adds Run key to start application
      • Checks whether UAC is enabled
      • Drops file in Program Files directory
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of WriteProcessMemory
      PID:2100
      • C:\Program Files (x86)\Mail.Ru\Guard\GuardMailRu.exe
        "C:\Program Files (x86)\Mail.Ru\Guard\GuardMailRu.exe" /gui
        3⤵
        • Executes dropped EXE
        • Loads dropped DLL
        PID:2848
  • C:\Program Files (x86)\Mail.Ru\Guard\GuardMailRu.exe
    "C:\Program Files (x86)\Mail.Ru\Guard\GuardMailRu.exe"
    1⤵
    • Executes dropped EXE
    • Drops file in System32 directory
    • Modifies Internet Explorer settings
    • Suspicious behavior: EnumeratesProcesses
    PID:2972

Network

        MITRE ATT&CK Enterprise v15

        Replay Monitor

        Loading Replay Monitor...

        Downloads

        Preferences

        • Path C:\Users\Admin\AppData\Local\Google\Chrome\User Data\Default\Preferences
        • Size 6KB
        • SHA256 ab8b9a31aa545022214f03809b3010540fd940dd03f0fa93659830135634497b
        • MD5 SHA1 SHA512 SSDEEP

        thumbnail_bg.png

        • Path C:\Users\Admin\AppData\Roaming\Mozilla\Firefox\Profiles\bm46du9w.Admin\extensions\{37964A3C-4EE8-47b1-8321-34DE2C39BA4D}\chrome\skin\tabs\thumbnail_bg.png
        • Size 162B
        • SHA256 539e5288dc16f987a223f3bb76a6ddd01a7ce75be796d679b09bc29c5cd85b4a
        • MD5 SHA1 SHA512

        2_10.png

        • Path C:\Users\Admin\AppData\Roaming\Mozilla\Firefox\Profiles\bm46du9w.Admin\extensions\{37964A3C-4EE8-47b1-8321-34DE2C39BA4D}\chrome\skin\weather\2_10.png
        • Size 3KB
        • SHA256 c7660d24b1239cc4a2a5d176a2c135ad104bbcbb904362297bb336de9f7a2bcf
        • MD5 SHA1 SHA512

        prefs.js

        • Path C:\Users\Admin\AppData\Roaming\Mozilla\Firefox\Profiles\bm46du9w.Admin\prefs.js
        • Size 69B
        • SHA256 b31be1373b73fa6a04c5c1c51dea2211f016d509a7fbef6d2bfac1015449ac4c
        • MD5 SHA1 SHA512

        install.rdf

        • Path C:\Users\Admin\AppData\Roaming\Mozilla\Firefox\Profiles\bm46du9w.default-release\extensions\{37964A3C-4EE8-47b1-8321-34DE2C39BA4D}\install.rdf
        • Size 1KB
        • SHA256 be86314e913facb86bcb10add8daba8a51208a5c82f77100fb8ed7b33cf89f05
        • MD5 SHA1 SHA512

        prefs.js

        • Path C:\Users\Admin\AppData\Roaming\Mozilla\Firefox\Profiles\bm46du9w.default-release\prefs.js
        • Size 6KB
        • SHA256 79f63f6787e744f68ec52a2925bb259741777fe5b1749f6d058570c85d011ab6
        • MD5 SHA1 SHA512 SSDEEP

        MailRuSputnik.dll

        • Path \Program Files (x86)\Mail.Ru\Sputnik\MailRuSputnik.dll
        • Size 1.5MB
        • SHA256 460d1ec2f2019db2ab0c91f412c9ccda30d5266d9be3b8be8b0a9ccb9f2bc513
        • MD5 SHA1 SHA512 SSDEEP

        SputnikHelper.exe

        • Path \Program Files (x86)\Mail.Ru\Sputnik\SputnikHelper.exe
        • Size 263KB
        • SHA256 0ebe401d1115c3d9568156f24e40843b0c710b18b54f2ee20627e72cf04dca9e
        • MD5 SHA1 SHA512 SSDEEP

        GuardMailRu.exe

        • Path \Users\Admin\AppData\Local\Temp\GuardMailRu.exe
        • Size 1.7MB
        • SHA256 2fe206942c8bb8789b19ca663dbdeb5a57eae513f5e8e6264902099bcfdc7bd1
        • MD5 SHA1 SHA512 SSDEEP

        memory/2848-576-0x0000000000080000-0x0000000000081000-memory.dmp

        memory/2848-588-0x0000000000080000-0x0000000000081000-memory.dmp