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Overview

overview

9

Static

static

3

Crypter.exe

windows7-x64

9

Crypter.exe

windows10-2004-x64

9

Analysis

  • max time kernel
    128s
  • max time network
    33s
  • platform
    windows7_x64
  • resource
    win7-20230621-en
  • resource tags

    arch:x64arch:x86image:win7-20230621-enlocale:en-usos:windows7-x64system
  • submitted
    28/06/2023, 14:53

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General

  • Target

    Crypter.exe

  • Size

    141KB

  • MD5

    26156564a104eae0cc9b06306a63ed9a

  • SHA1

    a81e06b82d233c813b8803ce1c608b83cbbba8e6

  • SHA256

    f1bb5ce204bc9e9fd12c3cb8c376e36e9ab47528c7c1ca865b38b8bd02314fc9

  • SHA512

    f5d502ded9705a7dc53243d9dfae2095f95fbbc288a737f2d4259caa8a6ecbc6b256d786fae042d12af4931b79033540ef0aee98fc6a5ed99539fc7a122b7c98

  • SSDEEP

    3072:4qHmFIAcneRB2ukEtRJ2XgqNjjCvvkfV7mF:JmsexkEt2hWCm

Score
9/10
ransomwarespywarestealer

Malware Config

Signatures

  • Deletes shadow copies 2 TTPs

    Ransomware often targets backup files to inhibit system recovery.

    ransomware
  • Renames multiple (10303) files with added filename extension

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

    ransomware
  • Modifies extensions of user files 16 IoCs

    Ransomware generally changes the extension on encrypted files.

    ransomware
  • Executes dropped EXE 1 IoCs
  • Loads dropped DLL 1 IoCs
  • Reads user/profile data of web browsers 2 TTPs

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

    spywarestealer
  • Enumerates connected drives 3 TTPs 25 IoCs

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

  • Drops file in Program Files directory 64 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Creates scheduled task(s) 1 TTPs 1 IoCs

    Schtasks is often used by malware for persistence or to perform post-infection execution.

    persistence
  • Interacts with shadow copies 2 TTPs 2 IoCs

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

    ransomware
  • Opens file in notepad (likely ransom note) 3 IoCs
    ransomware
  • Suspicious behavior: EnumeratesProcesses 36 IoCs
  • Suspicious use of AdjustPrivilegeToken 64 IoCs
  • Suspicious use of FindShellTrayWindow 1 IoCs
  • Suspicious use of WriteProcessMemory 38 IoCs
  • 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\Crypter.exe
    "C:\Users\Admin\AppData\Local\Temp\Crypter.exe"
    1⤵
    • Modifies extensions of user files
    • Enumerates connected drives
    • Drops file in Program Files directory
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:1768
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /c SCHTASKS.exe /Create /RU "NT AUTHORITY\SYSTEM" /sc onstart /TN "Windows Update BETA" /TR "C:\Users\Admin\AppData\Local\Temp\Crypter.exe" /F
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:1716
      • C:\Windows\SysWOW64\schtasks.exe
        SCHTASKS.exe /Create /RU "NT AUTHORITY\SYSTEM" /sc onstart /TN "Windows Update BETA" /TR "C:\Users\Admin\AppData\Local\Temp\Crypter.exe" /F
        3⤵
        • Creates scheduled task(s)
        PID:1064
    • C:\Windows\System32\cmd.exe
      "C:\Windows\System32\cmd.exe" /c vssadmin.exe delete shadows /all /quiet
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:1252
      • C:\Windows\system32\vssadmin.exe
        vssadmin.exe delete shadows /all /quiet
        3⤵
        • Interacts with shadow copies
        PID:1728
    • C:\Windows\System32\cmd.exe
      "C:\Windows\System32\cmd.exe" /c vssadmin.exe delete shadows /all /quiet
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:1948
      • C:\Windows\system32\vssadmin.exe
        vssadmin.exe delete shadows /all /quiet
        3⤵
        • Interacts with shadow copies
        PID:828
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /c "C:\Users\Admin\AppData\Local\Temp\L11.tmp"
      2⤵
      • Loads dropped DLL
      • Suspicious use of WriteProcessMemory
      PID:288
      • C:\Users\Admin\AppData\Local\Temp\L11.tmp
        C:\Users\Admin\AppData\Local\Temp\L11.tmp
        3⤵
        • Executes dropped EXE
        PID:924
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /c SCHTASKS.exe /Delete /TN "Windows Update BETA" /F
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:1288
      • C:\Windows\SysWOW64\schtasks.exe
        SCHTASKS.exe /Delete /TN "Windows Update BETA" /F
        3⤵
          PID:1060
    • C:\Windows\system32\vssvc.exe
      C:\Windows\system32\vssvc.exe
      1⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:960
    • C:\Windows\system32\NOTEPAD.EXE
      "C:\Windows\system32\NOTEPAD.EXE" C:\Users\Admin\Desktop\resq_Recovery.txt
      1⤵
      • Opens file in notepad (likely ransom note)
      PID:852
    • C:\Windows\system32\NOTEPAD.EXE
      "C:\Windows\system32\NOTEPAD.EXE" C:\Users\Admin\Desktop\resq_Recovery.txt
      1⤵
      • Opens file in notepad (likely ransom note)
      PID:1512
    • C:\Windows\system32\NOTEPAD.EXE
      "C:\Windows\system32\NOTEPAD.EXE" C:\Users\Admin\Documents\resq_Recovery.txt
      1⤵
      • Opens file in notepad (likely ransom note)
      PID:204
    • C:\Program Files\7-Zip\7zG.exe
      "C:\Program Files\7-Zip\7zG.exe" a -i#7zMap18302:282:7zEvent14191 -ad -saa -- "C:\Users\Admin\Documents\Documents"
      1⤵
      • Suspicious use of FindShellTrayWindow
      PID:292
    • C:\Windows\system32\AUDIODG.EXE
      C:\Windows\system32\AUDIODG.EXE 0x570
      1⤵
        PID:2040

      Network

      MITRE ATT&CK Enterprise v6

      Replay Monitor

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      Downloads

      • C:\Users\Admin\AppData\Local\Temp\L11.tmp
        Filesize

        5KB

        MD5

        ab65af4349e7c5b0872c8b808d036980

        SHA1

        414b2a2748b7ea6176c1d2453f89fdc8a2d349d0

        SHA256

        a6c41f368f42a7c57c307a48ce2440a60a744226b6414fadb6517a80a5d160a2

        SHA512

        2c61c56e8c299677bad4ce223e3187200c341aa4dd4503fac1217aa8e15687af03544a6d160bb2b1b131a56ea9df2967e00359aa622f12d1b82605c40cca6679

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      • C:\Users\Admin\AppData\Local\Temp\L11.tmp
        Filesize

        5KB

        MD5

        ab65af4349e7c5b0872c8b808d036980

        SHA1

        414b2a2748b7ea6176c1d2453f89fdc8a2d349d0

        SHA256

        a6c41f368f42a7c57c307a48ce2440a60a744226b6414fadb6517a80a5d160a2

        SHA512

        2c61c56e8c299677bad4ce223e3187200c341aa4dd4503fac1217aa8e15687af03544a6d160bb2b1b131a56ea9df2967e00359aa622f12d1b82605c40cca6679

        Download Submit

      • C:\Users\Admin\Desktop\resq_Recovery.txt
        Filesize

        690B

        MD5

        557f56a43cfbac7ddf83eeefb5aaeaa6

        SHA1

        0a9a5a5d46c60dd3d2acaae5e0a7c5bfd2677c4a

        SHA256

        3aa1bc73e902b58f6ab3dc7ff49e71e355eae50ae00448b554c8c509e99f4c78

        SHA512

        1c1c5cf1101195f19036ac7f2cd1addb3412ae53401801443becfa708bbe9ed3198093455a608947af5a211dc787913f06902c10e3c850d0272cac69df4993df

        Download Submit

      • C:\Users\Admin\Documents\ResetRead.dotm.resq100
        Filesize

        821KB

        MD5

        eb01332a8b8c2fa528c0d2f8d35f5a85

        SHA1

        5bf0972a788b0312c2084452b081c022edb0290a

        SHA256

        4944a94c603a747582d2bce8fa0c88786b0eb30afeda46acfcd34c483ad06cf4

        SHA512

        7316544220f8a2269cba8cd1037b6a90cc6695680f8ce78faafb7c1c65380e82025544d33cea390c923cb725bfab0fd789221d193365db5a944f23803f584151

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      • C:\Users\Admin\Documents\ResolveOut.xlsb.resq100
        Filesize

        403KB

        MD5

        3e10e0145b26950172d73096e853e95c

        SHA1

        796d15533fbdec1943088513d483484bdb2f3ee3

        SHA256

        701372039a93f9c2ee1bd1c47348e4d6961a48587d835cbebb0d50d3a566b3a2

        SHA512

        7dfa16e4687dfec304bf3da426f34cc375c047f474e309fd3163f40c60a370c7d70cd4fe0f7db445b7acc115d92ddb4f0ae53000df1f0ab9fe1d59f284ed74b7

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

        690B

        MD5

        557f56a43cfbac7ddf83eeefb5aaeaa6

        SHA1

        0a9a5a5d46c60dd3d2acaae5e0a7c5bfd2677c4a

        SHA256

        3aa1bc73e902b58f6ab3dc7ff49e71e355eae50ae00448b554c8c509e99f4c78

        SHA512

        1c1c5cf1101195f19036ac7f2cd1addb3412ae53401801443becfa708bbe9ed3198093455a608947af5a211dc787913f06902c10e3c850d0272cac69df4993df

        Download Submit

      • C:\Users\resq_Recovery.txt
        Filesize

        690B

        MD5

        557f56a43cfbac7ddf83eeefb5aaeaa6

        SHA1

        0a9a5a5d46c60dd3d2acaae5e0a7c5bfd2677c4a

        SHA256

        3aa1bc73e902b58f6ab3dc7ff49e71e355eae50ae00448b554c8c509e99f4c78

        SHA512

        1c1c5cf1101195f19036ac7f2cd1addb3412ae53401801443becfa708bbe9ed3198093455a608947af5a211dc787913f06902c10e3c850d0272cac69df4993df

        Download Submit

      • \Users\Admin\AppData\Local\Temp\L11.tmp
        Filesize

        5KB

        MD5

        ab65af4349e7c5b0872c8b808d036980

        SHA1

        414b2a2748b7ea6176c1d2453f89fdc8a2d349d0

        SHA256

        a6c41f368f42a7c57c307a48ce2440a60a744226b6414fadb6517a80a5d160a2

        SHA512

        2c61c56e8c299677bad4ce223e3187200c341aa4dd4503fac1217aa8e15687af03544a6d160bb2b1b131a56ea9df2967e00359aa622f12d1b82605c40cca6679

        Download Submit