Overview

overview

10

Static

static

10

winrar downloader.exe

windows7-x64

10

Analysis

  • max time kernel
    44s
  • max time network
    18s
  • platform
    windows7_x64
  • resource
    win7-20240704-en
  • resource tags

    arch:x64arch:x86image:win7-20240704-enlocale:en-usos:windows7-x64system
  • submitted
    29-08-2024 07:58

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General

  • Target

    winrar downloader.exe

  • Size

    96KB

  • MD5

    b2692504c14981764eba95b5cda1aac8

  • SHA1

    f35d3653f2c166caea51977042877cb6e1544b85

  • SHA256

    6e951ec3eefa660258a0e12350e3e477348467f15feb77b71b5a89c73532ce8a

  • SHA512

    66c73af4e0db0463c46bb7443c56eeac1dded76f19d7512be287c944944e753c2db8d4ebe523493f39a70965c27c5c51ec1d44eb286ed70319e775b35cdd2b33

  • SSDEEP

    1536:dNpn7Ddnq9VXNlEOr/9bq9q7ExehRN2Qk4BHqhiGgiFMzLPwiSfiKxNXCGEP9jFY:Rndnq9VdMtj

Score
10/10
chaosdefense_evasionevasionexecutionimpactpersistenceransomwarespywarestealer

Malware Config

Extracted

Path

C:\Users\Admin\AppData\Local\Google\Chrome\User Data\read_it.txt

Ransom Note
Don't worry, you can return all your files! All your files like documents, photos, databases and other important are encrypted What guarantees do we give to you? You can send 3 of your encrypted files and we decrypt it for free. You must follow these steps To decrypt your files : 1) Write on our e-mail :[email protected] ( In case of no answer in 24 hours check your spam folder or write us to this e-mail: [email protected]) 2) Obtain Bitcoin (You have to pay for decryption in Bitcoins. After payment we will send you the tool that will decrypt all your files.)

Signatures

  • Chaos

    Ransomware family first seen in June 2021.

    ransomwarechaos
  • Chaos Ransomware 3 IoCs
  • Deletes shadow copies 3 TTPs

    Ransomware often targets backup files to inhibit system recovery.

    ransomwaredefense_evasionimpactexecution
  • 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
  • Disables Task Manager via registry modification
    evasion
  • Drops startup file 2 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
  • Adds Run key to start application 2 TTPs 1 IoCs
    persistence
  • Drops desktop.ini file(s) 64 IoCs
  • Enumerates connected drives 3 TTPs 23 IoCs

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

  • 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).

  • Interacts with shadow copies 3 TTPs 1 IoCs

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

    ransomware
  • Modifies registry class 1 IoCs
  • Opens file in notepad (likely ransom note) 1 IoCs
    ransomware
  • Suspicious behavior: AddClipboardFormatListener 2 IoCs
  • Suspicious behavior: EnumeratesProcesses 14 IoCs
  • Suspicious behavior: GetForegroundWindowSpam 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 49 IoCs
  • Suspicious use of FindShellTrayWindow 39 IoCs
  • Suspicious use of SendNotifyMessage 38 IoCs
  • Suspicious use of WriteProcessMemory 30 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\winrar downloader.exe
    "C:\Users\Admin\AppData\Local\Temp\winrar downloader.exe"
    1⤵
    • Suspicious behavior: AddClipboardFormatListener
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:2532
    • C:\Users\Admin\AppData\Roaming\svchost.exe
      "C:\Users\Admin\AppData\Roaming\svchost.exe"
      2⤵
      • Drops startup file
      • Executes dropped EXE
      • Adds Run key to start application
      • Drops desktop.ini file(s)
      • Sets desktop wallpaper using registry
      • Suspicious behavior: AddClipboardFormatListener
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:2804
      • 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:2812
        • C:\Windows\system32\vssadmin.exe
          vssadmin delete shadows /all /quiet
          4⤵
          • Interacts with shadow copies
          PID:2884
        • C:\Windows\System32\Wbem\WMIC.exe
          wmic shadowcopy delete
          4⤵
          • Suspicious use of AdjustPrivilegeToken
          PID:964
      • 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:2964
        • C:\Windows\system32\bcdedit.exe
          bcdedit /set {default} bootstatuspolicy ignoreallfailures
          4⤵
          • Modifies boot configuration data using bcdedit
          PID:2944
        • C:\Windows\system32\bcdedit.exe
          bcdedit /set {default} recoveryenabled no
          4⤵
          • Modifies boot configuration data using bcdedit
          PID:2952
      • C:\Windows\System32\cmd.exe
        "C:\Windows\System32\cmd.exe" /C wbadmin delete catalog -quiet
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:3000
        • C:\Windows\system32\wbadmin.exe
          wbadmin delete catalog -quiet
          4⤵
          • Deletes backup catalog
          PID:3008
      • C:\Windows\system32\NOTEPAD.EXE
        "C:\Windows\system32\NOTEPAD.EXE" C:\Users\Admin\AppData\Roaming\read_it.txt
        3⤵
        • Opens file in notepad (likely ransom note)
        PID:2832
  • C:\Windows\system32\vssvc.exe
    C:\Windows\system32\vssvc.exe
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    PID:2416
  • C:\Windows\system32\taskmgr.exe
    "C:\Windows\system32\taskmgr.exe" /4
    1⤵
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious behavior: GetForegroundWindowSpam
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of FindShellTrayWindow
    • Suspicious use of SendNotifyMessage
    PID:2300
  • C:\Windows\system32\wbengine.exe
    "C:\Windows\system32\wbengine.exe"
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    PID:2996
  • C:\Windows\System32\vdsldr.exe
    C:\Windows\System32\vdsldr.exe -Embedding
    1⤵
      PID:2472
    • C:\Windows\System32\vds.exe
      C:\Windows\System32\vds.exe
      1⤵
        PID:1036
      • C:\Windows\system32\rundll32.exe
        "C:\Windows\system32\rundll32.exe" C:\Windows\system32\shell32.dll,OpenAs_RunDLL C:\Users\Admin\Desktop\WaitTrace.vssx
        1⤵
        • Modifies registry class
        PID:2280
      • C:\Windows\system32\taskmgr.exe
        "C:\Windows\system32\taskmgr.exe" /4
        1⤵
          PID:2688
        • C:\Windows\system32\mstsc.exe
          "C:\Windows\system32\mstsc.exe"
          1⤵
          • Enumerates connected drives
          PID:2532

        Network

        MITRE ATT&CK Enterprise v15

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        Downloads

        • C:\Users\Admin\AppData\Local\Google\Chrome\User Data\read_it.txt
          Filesize

          582B

          MD5

          ed5cc52876db869de48a4783069c2a5e

          SHA1

          a9d51ceaeff715ace430f9462ab2ee4e7f33e70e

          SHA256

          45726f2f29967ef016f8d556fb6468a577307d67388cc4530295a9ca10fdfa36

          SHA512

          1745aefb9b4db4cdd7c08ee3a7d133db08f35a336fd18b598211519b481ef25ac84a3e8a3da3db06caef9f531288d1cf0ca8d4b2560637945e7953e8b45421f5

          Download Submit

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

          96KB

          MD5

          b2692504c14981764eba95b5cda1aac8

          SHA1

          f35d3653f2c166caea51977042877cb6e1544b85

          SHA256

          6e951ec3eefa660258a0e12350e3e477348467f15feb77b71b5a89c73532ce8a

          SHA512

          66c73af4e0db0463c46bb7443c56eeac1dded76f19d7512be287c944944e753c2db8d4ebe523493f39a70965c27c5c51ec1d44eb286ed70319e775b35cdd2b33

          Download Submit

        • C:\Users\Default\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Accessories\Notepad.lnk
          Filesize

          1B

          MD5

          d1457b72c3fb323a2671125aef3eab5d

          SHA1

          5bab61eb53176449e25c2c82f172b82cb13ffb9d

          SHA256

          8a8de823d5ed3e12746a62ef169bcf372be0ca44f0a1236abc35df05d96928e1

          SHA512

          ca63c07ad35d8c9fb0c92d6146759b122d4ec5d3f67ebe2f30ddb69f9e6c9fd3bf31a5e408b08f1d4d9cd68120cced9e57f010bef3cde97653fed5470da7d1a0

          Download Submit

        • memory/2300-13-0x0000000140000000-0x00000001405E8000-memory.dmp

          Filesize

          5.9MB

          Download

        • memory/2300-12-0x0000000140000000-0x00000001405E8000-memory.dmp

          Filesize

          5.9MB

          Download

        • memory/2300-1058-0x0000000140000000-0x00000001405E8000-memory.dmp

          Filesize

          5.9MB

          Download

        • memory/2532-9-0x000007FEF5580000-0x000007FEF5F6C000-memory.dmp

          Filesize

          9.9MB

          Download

        • memory/2532-0-0x000007FEF5583000-0x000007FEF5584000-memory.dmp

          Filesize

          4KB

          Download

        • memory/2532-2-0x000007FEF5580000-0x000007FEF5F6C000-memory.dmp

          Filesize

          9.9MB

          Download

        • memory/2532-1-0x0000000000E60000-0x0000000000E7E000-memory.dmp

          Filesize

          120KB

          Download

        • memory/2804-8-0x00000000001F0000-0x000000000020E000-memory.dmp

          Filesize

          120KB

          Download

        • memory/2804-10-0x000007FEF5580000-0x000007FEF5F6C000-memory.dmp

          Filesize

          9.9MB

          Download

        • memory/2804-11-0x000007FEF5580000-0x000007FEF5F6C000-memory.dmp

          Filesize

          9.9MB

          Download

        • memory/2804-14-0x000007FEF5580000-0x000007FEF5F6C000-memory.dmp

          Filesize

          9.9MB

          Download