Overview

overview

10

Static

static

10

ef8b996e4d...95.exe

windows7-x64

9

ef8b996e4d...95.exe

windows10-2004-x64

9

Analysis

  • max time kernel
    145s
  • max time network
    145s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240802-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system
  • submitted
    24/09/2024, 05:07

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General

  • Target
    ef8b996e4d7e84c179f8268f3d686195.exe
  • Size 146KB
  • Sample240924-fr1rfstckn
  • SHA256 d582110cd8a31d867e1a1eada4fb726acbbf960bed0aafeec854e455bc53403f
  • MD5 SHA1 SHA512 SSDEEP
Score
9/10
defense_evasiondiscoveryransomwarespywarestealer

Malware Config

Signatures

  • Renames multiple (602) files with added filename extension

    This suggests ransomware activity of encrypting all the files on the system.

    ransomware
  • Checks computer location settings 2 TTPs 1 IoCs

    Looks up country code configured in the registry, likely geofence.

  • Deletes itself 1 IoCs
  • Executes dropped EXE 1 IoCs
  • Reads user/profile data of web browsers 3 TTPs

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

    spywarestealer
  • Drops desktop.ini file(s) 2 IoCs
  • Indicator Removal: File Deletion 1 TTPs

    Adversaries may delete files left behind by the actions of their intrusion activity.

    defense_evasion
  • Drops file in System32 directory 4 IoCs
  • Suspicious use of NtSetInformationThreadHideFromDebugger 1 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • System Location Discovery: System Language Discovery 1 TTPs 3 IoCs

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

    discovery
  • Checks processor information in registry 2 TTPs 3 IoCs

    Processor information is often read in order to detect sandboxing environments.

  • Enumerates system info in registry 2 TTPs 3 IoCs
  • Suspicious behavior: EnumeratesProcesses 64 IoCs
  • Suspicious behavior: RenamesItself 26 IoCs
  • Suspicious use of AdjustPrivilegeToken 64 IoCs
  • Suspicious use of SetWindowsHookEx 13 IoCs
  • Suspicious use of WriteProcessMemory 11 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\ef8b996e4d7e84c179f8268f3d686195.exe
    "C:\Users\Admin\AppData\Local\Temp\ef8b996e4d7e84c179f8268f3d686195.exe"
    1⤵
    • Drops desktop.ini file(s)
    • System Location Discovery: System Language Discovery
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:4396
    • C:\Windows\splwow64.exe
      C:\Windows\splwow64.exe 12288
      2⤵
      • Drops file in System32 directory
      PID:948
    • C:\ProgramData\AAC8.tmp
      "C:\ProgramData\AAC8.tmp"
      2⤵
      • Checks computer location settings
      • Deletes itself
      • Executes dropped EXE
      • Suspicious use of NtSetInformationThreadHideFromDebugger
      • System Location Discovery: System Language Discovery
      • Suspicious behavior: RenamesItself
      • Suspicious use of WriteProcessMemory
      PID:1612
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C DEL /F /Q C:\PROGRA~3\AAC8.tmp >> NUL
        3⤵
        • System Location Discovery: System Language Discovery
        PID:2800
  • C:\Windows\system32\svchost.exe
    C:\Windows\system32\svchost.exe -k PrintWorkflow -s PrintWorkflowUserSvc
    1⤵
      PID:184
    • C:\Windows\system32\printfilterpipelinesvc.exe
      C:\Windows\system32\printfilterpipelinesvc.exe -Embedding
      1⤵
      • Drops file in System32 directory
      • Suspicious use of WriteProcessMemory
      PID:4472
      • C:\Program Files\Microsoft Office\root\Office16\ONENOTE.EXE
        /insertdoc "C:\Users\Admin\AppData\Local\Microsoft\Windows\INetCache\{304BC69C-C46F-4613-AB39-3B3D26B2A42C}.xps" 133716280380790000
        2⤵
        • Checks processor information in registry
        • Enumerates system info in registry
        • Suspicious use of SetWindowsHookEx
        PID:1280

    Network

          MITRE ATT&CK Enterprise v15

          Replay Monitor

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          Downloads

          YYYYYYYYYYY
          • Path C:\$Recycle.Bin\S-1-5-21-656926755-4116854191-210765258-1000\YYYYYYYYYYY
          • Size 129B
          • SHA256 ea6cbf3bd0c5956a0bc258a64b562e74adc86e74ffd47e1a22092301282f68f6
          • MD5 SHA1 SHA512
          Submit Download

          AAC8.tmp
          • Path C:\ProgramData\AAC8.tmp
          • Size 14KB
          • SHA256 917e115cc403e29b4388e0d175cbfac3e7e40ca1742299fbdb353847db2de7c2
          • MD5 SHA1 SHA512 SSDEEP
          Submit Download

          DDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDD
          • Path C:\Users\Admin\AppData\Local\Temp\DDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDD
          • Size 146KB
          • SHA256 079a944ccab4445b6108ad7ad7d31bfe56915b06f23833749bb6343453eeed51
          • MD5 SHA1 SHA512 SSDEEP
          Submit Download

          Open Notebook.onetoc2
          • Path C:\Users\Admin\Documents\OneNote Notebooks\My Notebook\Open Notebook.onetoc2
          • Size 4KB
          • SHA256 94e263433870ef1449eb9708ee4159f71a920a3a75960683a541ed8d202d7ad8
          • MD5 SHA1 SHA512 SSDEEP
          Submit Download

          iFnyJHFpx.README.txt
          • Path C:\iFnyJHFpx.README.txt
          • Size 638B
          • SHA256 7c750178e9525b4eef587eed36c7040a4806207909e4463a56f33073081b7de5
          • MD5 SHA1 SHA512
          Submit Download

          DDDDDDDDDDD
          • Path F:\$RECYCLE.BIN\S-1-5-21-656926755-4116854191-210765258-1000\DDDDDDDDDDD
          • Size 129B
          • SHA256 49d85fcb6fad28dc8720a44d3c5d4885dad0af79b334b49efb3d424495eb60fe
          • MD5 SHA1 SHA512
          Submit Download

          memory/1280-2826-0x00007FF933BD0000-0x00007FF933BE0000-memory.dmp
          Download

          memory/1280-2825-0x00007FF933BD0000-0x00007FF933BE0000-memory.dmp
          Download

          memory/1280-2827-0x00007FF933BD0000-0x00007FF933BE0000-memory.dmp
          Download

          memory/1280-2828-0x00007FF933BD0000-0x00007FF933BE0000-memory.dmp
          Download

          memory/1280-2829-0x00007FF933BD0000-0x00007FF933BE0000-memory.dmp
          Download

          memory/1280-2830-0x00007FF9315C0000-0x00007FF9315D0000-memory.dmp
          Download

          memory/1280-2831-0x00007FF9315C0000-0x00007FF9315D0000-memory.dmp
          Download

          memory/4396-2781-0x0000000001050000-0x0000000001060000-memory.dmp
          Download

          memory/4396-2780-0x0000000001050000-0x0000000001060000-memory.dmp
          Download

          memory/4396-2782-0x0000000001050000-0x0000000001060000-memory.dmp
          Download

          memory/4396-0-0x0000000001050000-0x0000000001060000-memory.dmp
          Download

          memory/4396-2-0x0000000001050000-0x0000000001060000-memory.dmp
          Download

          memory/4396-1-0x0000000001050000-0x0000000001060000-memory.dmp
          Download