Overview

overview

10

Static

static

26944aed6d...af.exe

windows7_x64

10

26944aed6d...af.exe

windows7_x64

10

26944aed6d...af.exe

windows10_x64

10

26944aed6d...af.exe

windows10_x64

10

Analysis

  • max time kernel
    136s
  • max time network
    137s
  • platform
    windows10_x64
  • resource
    win10-jp
  • submitted
    10-09-2021 02:02

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General

  • Target

    26944aed6dfc2c25f96bbca49925fcaf.exe

  • Size

    3.9MB

  • MD5

    26944aed6dfc2c25f96bbca49925fcaf

  • SHA1

    b2b7a7a659abf7fd2c5596c119478363e0b7f360

  • SHA256

    64dd547546394e1d431a25a671892c7aca9cf57ed0733a7435028792ad42f4a7

  • SHA512

    ea0a599107acfbca4cc20987d003bd27a3168adea1df56378d4b6a934d1429d543bec91a7216c485ec0167b1d34ed510299e030944c4b8f6c3922b4699a4eabf

Score
10/10
rustybuerloaderpersistence

Malware Config

Extracted

Family

rustybuer

C2

https://awmelisers.com/

Signatures

  • Modifies system executable filetype association 2 TTPs 3 IoCs
    persistence
  • Registers COM server for autorun 1 TTPs
    persistence
  • RustyBuer

    RustyBuer is a new variant of Buer loader written in Rust.

    loaderrustybuer
  • Suspicious use of NtCreateUserProcessOtherParentProcess 1 IoCs
  • Executes dropped EXE 1 IoCs
  • Loads dropped DLL 6 IoCs
  • Adds Run key to start application 2 TTPs 3 IoCs
    persistence
  • Enumerates connected drives 3 TTPs 49 IoCs

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

  • Drops file in System32 directory 4 IoCs
  • Suspicious use of SetThreadContext 1 IoCs
  • Modifies Internet Explorer settings 1 TTPs 2 IoCs
    adwarespyware
  • Modifies data under HKEY_USERS 23 IoCs
  • Modifies registry class 64 IoCs
  • Suspicious behavior: EnumeratesProcesses 32 IoCs
  • Suspicious use of AdjustPrivilegeToken 3 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 15 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\26944aed6dfc2c25f96bbca49925fcaf.exe
    "C:\Users\Admin\AppData\Local\Temp\26944aed6dfc2c25f96bbca49925fcaf.exe"
    1⤵
    • Suspicious use of SetThreadContext
    • Suspicious use of WriteProcessMemory
    PID:5012
    • C:\Windows\SysWOW64\secinit.exe
      "C:\Windows\System32\secinit.exe"
      2⤵
      • Enumerates connected drives
      • Suspicious behavior: EnumeratesProcesses
      PID:1296
  • C:\Users\Admin\AppData\Local\Microsoft\OneDrive\StandaloneUpdater\OneDriveSetup.exe
    "C:\Users\Admin\AppData\Local\Microsoft\OneDrive\StandaloneUpdater\OneDriveSetup.exe" /update
    1⤵
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    PID:4596
    • C:\Users\Admin\AppData\Local\Microsoft\OneDrive\StandaloneUpdater\OneDriveSetup.exe
      C:\Users\Admin\AppData\Local\Microsoft\OneDrive\StandaloneUpdater\OneDriveSetup.exe /update /peruser /childprocess /extractFilesWithLessThreadCount /renameReplaceOneDriveExe /renameReplaceODSUExe /removeNonCurrentVersions
      2⤵
      • Modifies system executable filetype association
      • Adds Run key to start application
      • Modifies Internet Explorer settings
      • Modifies registry class
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of WriteProcessMemory
      PID:1812
      • C:\Users\Admin\AppData\Local\Microsoft\OneDrive\21.150.0725.0001\FileSyncConfig.exe
        "C:\Users\Admin\AppData\Local\Microsoft\OneDrive\21.150.0725.0001\FileSyncConfig.exe"
        3⤵
        • Executes dropped EXE
        • Loads dropped DLL
        PID:4424
  • \??\c:\windows\system32\svchost.exe
    c:\windows\system32\svchost.exe -k netsvcs -s seclogon
    1⤵
    • Suspicious use of NtCreateUserProcessOtherParentProcess
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:1512
  • C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\Reader_sl.exe
    "C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\Reader_sl.exe"
    1⤵
      PID:4284
    • C:\Program Files\Common Files\Microsoft Shared\ClickToRun\OfficeC2RClient.exe
      "C:\Program Files\Common Files\Microsoft Shared\ClickToRun\OfficeC2RClient.exe" /frequentupdate SCHEDULEDTASK displaylevel=False
      1⤵
      • Drops file in System32 directory
      • Modifies data under HKEY_USERS
      • Suspicious use of SetWindowsHookEx
      PID:2324

    Network

    MITRE ATT&CK Enterprise v6

    Replay Monitor

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    Downloads

    • memory/1296-129-0x0000000000400000-0x0000000000535000-memory.dmp

      Filesize

      1.2MB

      Download

    • memory/1296-134-0x0000000000400000-0x0000000000535000-memory.dmp

      Filesize

      1.2MB

      Download

    • memory/5012-133-0x0000000000DB0000-0x0000000000DB1000-memory.dmp

      Filesize

      4KB

      Download