Overview

overview

10

Static

static

10

PrivateChat.exe

windows7-x64

10

PrivateChat.exe

windows10-2004-x64

10

Analysis

  • max time kernel
    133s
  • max time network
    128s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240226-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system
  • submitted
    22-03-2024 23:48

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General

  • Target

    PrivateChat.exe

  • Size

    120KB

  • MD5

    5d4c5f3457c4487fe26df768ed8f3d2b

  • SHA1

    f5f3df7d11e06dc158ac8183a8bde5895f8ea251

  • SHA256

    19c393a4787d325984d850d8f02db1f302819b808952f72c332251d5d95f7c32

  • SHA512

    793b8917ad068b77bcc7d771a28069ac432cfb441438e1a1f159fe94cbb2aa550fb2cc47d7354e30275ce2df402774902c987ad9b9be900f3748281f13a30e9a

  • SSDEEP

    3072:QoIcFr9LvJxaJ3e6ua0g0qcB2f/u80kcmU/C7eJBz4Jtu:dr9LvkbOqguxU6f4

Score
10/10
chaosevasionransomwarespywarestealer

Malware Config

Signatures

  • Chaos

    Ransomware family first seen in June 2021.

    ransomwarechaos
  • Chaos Ransomware 2 IoCs
  • Deletes shadow copies 2 TTPs

    Ransomware often targets backup files to inhibit system recovery.

    ransomware
  • Modifies boot configuration data using bcdedit 1 TTPs 2 IoCs
    ransomwareevasion
  • Deletes backup catalog 3 TTPs 1 IoCs

    Uses wbadmin.exe to inhibit system recovery.

    ransomware
  • Checks computer location settings 2 TTPs 2 IoCs

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

  • Drops startup file 3 IoCs
  • Executes dropped EXE 1 IoCs
  • Reads user/profile data of web browsers 2 TTPs

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

    spywarestealer
  • Drops desktop.ini file(s) 34 IoCs
  • Sets desktop wallpaper using registry 2 TTPs 1 IoCs
    ransomware
  • Enumerates physical storage devices 1 TTPs

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

  • Checks SCSI registry key(s) 3 TTPs 4 IoCs

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

  • Interacts with shadow copies 2 TTPs 1 IoCs

    Shadow copies are often targeted by ransomware to inhibit system recovery.

    ransomware
  • Modifies registry class 9 IoCs
  • Opens file in notepad (likely ransom note) 2 IoCs
    ransomware
  • Suspicious behavior: AddClipboardFormatListener 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 55 IoCs
  • Suspicious use of AdjustPrivilegeToken 50 IoCs
  • Suspicious use of SetWindowsHookEx 8 IoCs
  • Suspicious use of WriteProcessMemory 20 IoCs
  • Uses Task Scheduler COM API 1 TTPs

    The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.

    persistence
  • Uses Volume Shadow Copy service COM API

    The Volume Shadow Copy service is used to manage backups/snapshots.

    ransomware

Processes

  • C:\Users\Admin\AppData\Local\Temp\PrivateChat.exe
    "C:\Users\Admin\AppData\Local\Temp\PrivateChat.exe"
    1⤵
    • Checks computer location settings
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:4060
    • C:\Users\Admin\AppData\Roaming\PrivateChat.exe
      "C:\Users\Admin\AppData\Roaming\PrivateChat.exe"
      2⤵
      • Checks computer location settings
      • Drops startup file
      • Executes dropped EXE
      • Drops desktop.ini file(s)
      • Sets desktop wallpaper using registry
      • Modifies registry class
      • Suspicious behavior: AddClipboardFormatListener
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:2492
      • C:\Windows\System32\cmd.exe
        "C:\Windows\System32\cmd.exe" /C vssadmin delete shadows /all /quiet & wmic shadowcopy delete
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:4908
        • C:\Windows\system32\vssadmin.exe
          vssadmin delete shadows /all /quiet
          4⤵
          • Interacts with shadow copies
          PID:776
        • C:\Windows\System32\Wbem\WMIC.exe
          wmic shadowcopy delete
          4⤵
          • Suspicious use of AdjustPrivilegeToken
          PID:2236
      • C:\Windows\System32\cmd.exe
        "C:\Windows\System32\cmd.exe" /C bcdedit /set {default} bootstatuspolicy ignoreallfailures & bcdedit /set {default} recoveryenabled no
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:2384
        • C:\Windows\system32\bcdedit.exe
          bcdedit /set {default} bootstatuspolicy ignoreallfailures
          4⤵
          • Modifies boot configuration data using bcdedit
          PID:4624
        • C:\Windows\system32\bcdedit.exe
          bcdedit /set {default} recoveryenabled no
          4⤵
          • Modifies boot configuration data using bcdedit
          PID:2972
      • C:\Windows\System32\cmd.exe
        "C:\Windows\System32\cmd.exe" /C wbadmin delete catalog -quiet
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:4436
        • C:\Windows\system32\wbadmin.exe
          wbadmin delete catalog -quiet
          4⤵
          • Deletes backup catalog
          PID:2876
      • C:\Windows\system32\NOTEPAD.EXE
        "C:\Windows\system32\NOTEPAD.EXE" C:\Users\Admin\AppData\Roaming\README.txt
        3⤵
        • Opens file in notepad (likely ransom note)
        PID:3076
  • C:\Windows\system32\vssvc.exe
    C:\Windows\system32\vssvc.exe
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    PID:3796
  • C:\Windows\system32\wbengine.exe
    "C:\Windows\system32\wbengine.exe"
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    PID:4420
  • C:\Windows\System32\vdsldr.exe
    C:\Windows\System32\vdsldr.exe -Embedding
    1⤵
      PID:2332
    • C:\Windows\System32\vds.exe
      C:\Windows\System32\vds.exe
      1⤵
      • Checks SCSI registry key(s)
      PID:3724
    • C:\Windows\system32\OpenWith.exe
      C:\Windows\system32\OpenWith.exe -Embedding
      1⤵
      • Modifies registry class
      • Suspicious use of SetWindowsHookEx
      PID:928
    • C:\Windows\system32\OpenWith.exe
      C:\Windows\system32\OpenWith.exe -Embedding
      1⤵
      • Modifies registry class
      • Suspicious use of SetWindowsHookEx
      PID:464
    • C:\Windows\system32\OpenWith.exe
      C:\Windows\system32\OpenWith.exe -Embedding
      1⤵
      • Modifies registry class
      • Suspicious use of SetWindowsHookEx
      PID:1684
    • C:\Windows\system32\OpenWith.exe
      C:\Windows\system32\OpenWith.exe -Embedding
      1⤵
      • Modifies registry class
      • Suspicious use of SetWindowsHookEx
      PID:696
    • C:\Windows\system32\OpenWith.exe
      C:\Windows\system32\OpenWith.exe -Embedding
      1⤵
      • Modifies registry class
      • Suspicious use of SetWindowsHookEx
      PID:412
    • C:\Windows\system32\OpenWith.exe
      C:\Windows\system32\OpenWith.exe -Embedding
      1⤵
      • Modifies registry class
      • Suspicious use of SetWindowsHookEx
      PID:4584
    • C:\Windows\system32\OpenWith.exe
      C:\Windows\system32\OpenWith.exe -Embedding
      1⤵
      • Modifies registry class
      • Suspicious use of SetWindowsHookEx
      PID:1384
    • C:\Windows\system32\OpenWith.exe
      C:\Windows\system32\OpenWith.exe -Embedding
      1⤵
      • Modifies registry class
      • Suspicious use of SetWindowsHookEx
      PID:928
    • C:\Windows\system32\NOTEPAD.EXE
      "C:\Windows\system32\NOTEPAD.EXE" C:\Users\Public\Desktop\README.txt
      1⤵
      • Opens file in notepad (likely ransom note)
      PID:2312

    Network

    MITRE ATT&CK Enterprise v15

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    Downloads

    • C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\PrivateChat.exe.log
      Filesize

      226B

      MD5

      28d7fcc2b910da5e67ebb99451a5f598

      SHA1

      a5bf77a53eda1208f4f37d09d82da0b9915a6747

      SHA256

      2391511d0a66ed9f84ae54254f51c09e43be01ad685db80da3201ec880abd49c

      SHA512

      2d8eb65cbf04ca506f4ef3b9ae13ccf05ebefab702269ba70ffd1ce9e6c615db0a3ee3ac0e81a06f546fc3250b7b76155dd51241c41b507a441b658c8e761df6

      Download Submit

    • C:\Users\Admin\AppData\Roaming\PrivateChat.exe
      Filesize

      120KB

      MD5

      5d4c5f3457c4487fe26df768ed8f3d2b

      SHA1

      f5f3df7d11e06dc158ac8183a8bde5895f8ea251

      SHA256

      19c393a4787d325984d850d8f02db1f302819b808952f72c332251d5d95f7c32

      SHA512

      793b8917ad068b77bcc7d771a28069ac432cfb441438e1a1f159fe94cbb2aa550fb2cc47d7354e30275ce2df402774902c987ad9b9be900f3748281f13a30e9a

      Download Submit

    • C:\Users\Admin\Documents\README.txt
      Filesize

      366B

      MD5

      a9739643e50a5d9ca0f162feb7846dd5

      SHA1

      d10c5feedd35fd2a24cd1266014ae8adaad22fd3

      SHA256

      e611bd6ae4702f7496dda7ae78a5df097d1e6858c7fa38b3b9b7140379f7d51c

      SHA512

      cb5e3943ccce39f10a899a4900952b702601840a2e6dd8e385ebed1e4e7b041f8440dd7dde229c5d28cf82f380b17f498a3e6cb8426d984b71a4115de3df9552

      Download Submit

    • memory/2492-15-0x00007FFDB6630000-0x00007FFDB70F1000-memory.dmp

      Filesize

      10.8MB

      Download

    • memory/2492-17-0x00000000029C0000-0x00000000029D0000-memory.dmp

      Filesize

      64KB

      Download

    • memory/2492-440-0x00007FFDB6630000-0x00007FFDB70F1000-memory.dmp

      Filesize

      10.8MB

      Download

    • memory/2492-441-0x00000000029C0000-0x00000000029D0000-memory.dmp

      Filesize

      64KB

      Download

    • memory/4060-0-0x0000000000710000-0x0000000000734000-memory.dmp

      Filesize

      144KB

      Download

    • memory/4060-1-0x00007FFDB6630000-0x00007FFDB70F1000-memory.dmp

      Filesize

      10.8MB

      Download

    • memory/4060-439-0x00007FFDB6630000-0x00007FFDB70F1000-memory.dmp

      Filesize

      10.8MB

      Download