Analysis

  • max time kernel
    120s
  • max time network
    121s
  • platform
    windows7_x64
  • resource
    win7-20240508-en
  • resource tags

    arch:x64arch:x86image:win7-20240508-enlocale:en-usos:windows7-x64system
  • submitted
    17/06/2024, 00:04

General

  • Target
    brk.bat
  • Size 3KB
  • Sample240617-acn68avcqa
  • SHA256 4d177a08245a8c582abbdae3a83fcf95a8fd464ebd040a1f69c10e30f72704f5
  • MD5 SHA1 SHA512

Malware Config

Signatures

  • Deletes shadow copies 3 TTPs

    Ransomware often targets backup files to inhibit system recovery.

  • Reads user/profile data of web browsers 2 TTPs

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

  • Enumerates physical storage devices 1 TTPs

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

  • Modifies Internet Explorer settings 1 TTPs 36 IoCs
  • NTFS ADS 1 IoCs
  • Suspicious behavior: CmdExeWriteProcessMemorySpam 2 IoCs
  • Suspicious behavior: EnumeratesProcesses 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 43 IoCs
  • Suspicious use of FindShellTrayWindow 1 IoCs
  • Suspicious use of SetWindowsHookEx 6 IoCs
  • Suspicious use of WriteProcessMemory 27 IoCs
  • Uses Volume Shadow Copy service COM API

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

Processes

  • C:\Windows\system32\cmd.exe
    cmd /c "C:\Users\Admin\AppData\Local\Temp\brk.bat"
    1⤵
    • NTFS ADS
    • Suspicious use of WriteProcessMemory
    PID:2140
    • C:\Windows\system32\chcp.com
      chcp 866
      2⤵
        PID:1960
      • C:\Users\Admin\AppData\Local\Temp\gpg.exe
        C:\Users\Admin\AppData\Local\Temp\gpg.exe --import C:\Users\Admin\AppData\Local\Temp\brg.brg
        2⤵
        • Suspicious behavior: CmdExeWriteProcessMemorySpam
        PID:2968
      • C:\Users\Admin\AppData\Local\Temp\gpg.exe
        C:\Users\Admin\AppData\Local\Temp\gpg.exe -r y1688 --yes -q --no-verbose --trust-model always -o C:\Users\Admin\AppData\Local\Temp\zarlock.KEY -e C:\Users\Admin\AppData\Local\Temp\rost.doc
        2⤵
        • Suspicious behavior: CmdExeWriteProcessMemorySpam
        • Suspicious behavior: EnumeratesProcesses
        PID:2992
      • C:\Windows\system32\cmd.exe
        C:\Windows\system32\cmd.exe /c type C:\Users\Admin\AppData\Local\Temp\Flag.txt
        2⤵
          PID:2176
        • C:\Windows\System32\WScript.exe
          "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\sh.vbs"
          2⤵
          • Suspicious use of WriteProcessMemory
          PID:2948
          • C:\Windows\System32\wbem\WMIC.exe
            "C:\Windows\System32\wbem\WMIC.exe" shadowcopy delete /nointeractive
            3⤵
            • Suspicious use of AdjustPrivilegeToken
            PID:2596
        • C:\Program Files\Internet Explorer\iexplore.exe
          "C:\Program Files\Internet Explorer\iexplore.exe" C:\Users\Admin\AppData\Local\Temp\zarlock_Help_decrypt.html
          2⤵
          • Modifies Internet Explorer settings
          • Suspicious use of FindShellTrayWindow
          • Suspicious use of SetWindowsHookEx
          • Suspicious use of WriteProcessMemory
          PID:2676
          • C:\Program Files (x86)\Internet Explorer\IEXPLORE.EXE
            "C:\Program Files (x86)\Internet Explorer\IEXPLORE.EXE" SCODEF:2676 CREDAT:275457 /prefetch:2
            3⤵
            • Modifies Internet Explorer settings
            • Suspicious use of SetWindowsHookEx
            PID:624
      • C:\Windows\system32\vssvc.exe
        C:\Windows\system32\vssvc.exe
        1⤵
        • Suspicious use of AdjustPrivilegeToken
        PID:2500

      Network

            MITRE ATT&CK Enterprise v15

            Replay Monitor

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            Downloads

            Flag.txt

            • Path C:\Users\Admin\AppData\Local\Temp\Flag.txt
            • Size 268KB
            • SHA256 a085c7f909ee17e6552062ac2838603ca57c282cefc73d6000c8ed3003762a25
            • MD5 SHA1 SHA512 SSDEEP

            Flag.txt

            • Path C:\Users\Admin\AppData\Local\Temp\Flag.txt
            • Size 4KB
            • SHA256 0fa0ed58e9fe97e2a66bb3488115e11c7da20eaa399c03fb65434f36fdea44f0
            • MD5 SHA1 SHA512 SSDEEP

            rost.doc

            • Path C:\Users\Admin\AppData\Local\Temp\rost.doc
            • Size 39B
            • SHA256 8049ecb1f7a5242302ad378e9b485622f1287e57f5ec90c1aef6bca5cacf1880
            • MD5 SHA1 SHA512

            zarlock_Help_decrypt.html

            • Path C:\Users\Admin\AppData\Local\Temp\zarlock_Help_decrypt.html
            • Size 683B
            • SHA256 ec07910016d5d1cba9299bcb60079c37e1b3b9e63aebcffd5612365849232f09
            • MD5 SHA1 SHA512

            pubring.kbx

            • Path C:\Users\Admin\AppData\Roaming\gnupg\pubring.kbx
            • Size 1KB
            • SHA256 65f0bd2afdeb0fedfe298734c42a5f49d4c7d6a0dc7be53851f6e09630452176
            • MD5 SHA1 SHA512

            trustdb.gpg

            • Path C:\Users\Admin\AppData\Roaming\gnupg\trustdb.gpg
            • Size 1KB
            • SHA256 622d221beeeef268f7df45530a1c186df1d519d4001a0c72daa1baee3812be31
            • MD5 SHA1 SHA512

            memory/2968-10-0x0000000065A80000-0x0000000065A99000-memory.dmp

            memory/2968-9-0x0000000000400000-0x0000000000519000-memory.dmp

            memory/2968-11-0x000000006B480000-0x000000006B4AF000-memory.dmp

            memory/2968-12-0x00000000655C0000-0x00000000656BA000-memory.dmp

            memory/2968-14-0x0000000063080000-0x00000000630A0000-memory.dmp

            memory/2968-13-0x0000000066580000-0x000000006664C000-memory.dmp

            memory/2992-23-0x00000000655C0000-0x00000000656BA000-memory.dmp

            memory/2992-25-0x0000000063080000-0x00000000630A0000-memory.dmp

            memory/2992-24-0x0000000066580000-0x000000006664C000-memory.dmp

            memory/2992-22-0x000000006B480000-0x000000006B4AF000-memory.dmp

            memory/2992-21-0x0000000065A80000-0x0000000065A99000-memory.dmp

            memory/2992-20-0x0000000000400000-0x0000000000519000-memory.dmp