Analysis

  • max time kernel
    127s
  • max time network
    148s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220812-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
  • submitted
    29-09-2022 10:36

General

  • Target

    Bolbi.vbs

  • Size

    46KB

  • MD5

    99ec3237394257cb0b5c24affe458f48

  • SHA1

    5300e68423da9712280e601b51622c4b567a23a4

  • SHA256

    ec17f950f6ee9c0c237d93bc0b766aa6e2ab458c70320b534212043128177b51

  • SHA512

    af2394d18f672def6d5d7081def759093759205aac0390ca03591c58c15a02e463a68b583b6fc28ef1368922b4bd5f9072d570ee97a955250a478cdb093500cb

  • SSDEEP

    384:m71ThEgivcqpCghtpCAhDnVLri57VurlgRL1xCLI05ej+1DPpUo/i/vFCbWZkraB:m7BGV95hIG1/d49gsCDsl

Malware Config

Signatures

  • UAC bypass 3 TTPs 1 IoCs
  • Blocklisted process makes network request 5 IoCs
  • Disables cmd.exe use via registry modification 1 IoCs
  • Modifies Installed Components in the registry 2 TTPs 1 IoCs
  • Possible privilege escalation attempt 4 IoCs
  • Sets file execution options in registry 2 TTPs 64 IoCs
  • Checks computer location settings 2 TTPs 2 IoCs

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

  • Modifies file permissions 1 TTPs 4 IoCs
  • Adds Run key to start application 2 TTPs 4 IoCs
  • Checks whether UAC is enabled 1 TTPs 1 IoCs
  • Enumerates connected drives 3 TTPs 1 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
  • Drops file in Program Files directory 64 IoCs
  • Drops file in Windows directory 1 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Checks SCSI registry key(s) 3 TTPs 58 IoCs

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

  • Enumerates system info in registry 2 TTPs 2 IoCs
  • Kills process with taskkill 1 IoCs
  • Modifies Control Panel 4 IoCs
  • Modifies registry class 62 IoCs
  • Suspicious behavior: GetForegroundWindowSpam 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 49 IoCs
  • Suspicious use of FindShellTrayWindow 49 IoCs
  • Suspicious use of SendNotifyMessage 29 IoCs
  • Suspicious use of SetWindowsHookEx 4 IoCs
  • Suspicious use of WriteProcessMemory 22 IoCs
  • System policy modification 1 TTPs 31 IoCs

Processes

  • C:\Windows\System32\WScript.exe
    "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\Bolbi.vbs"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:2608
    • C:\Windows\System32\wscript.exe
      "C:\Windows\System32\wscript.exe" "C:\Users\Admin\AppData\Local\Temp\Bolbi.vbs" /elevated
      2⤵
      • UAC bypass
      • Blocklisted process makes network request
      • Disables cmd.exe use via registry modification
      • Sets file execution options in registry
      • Checks computer location settings
      • Adds Run key to start application
      • Checks whether UAC is enabled
      • Sets desktop wallpaper using registry
      • Drops file in Program Files directory
      • Drops file in Windows directory
      • Modifies Control Panel
      • Suspicious use of WriteProcessMemory
      • System policy modification
      PID:1084
      • C:\Windows\System32\cmd.exe
        "C:\Windows\System32\cmd.exe" /c C:\Users\Public\Ghostroot\KillDora.bat
        3⤵
        • Modifies registry class
        • Suspicious use of WriteProcessMemory
        PID:5116
        • C:\Windows\System32\rundll32.exe
          C:\Windows\System32\RUNDLL32.EXE user32.dll, UpdatePerUserSystemParameters
          4⤵
            PID:2432
          • C:\Windows\system32\reg.exe
            reg delete "HKLM\System\CurrentControlSet\Control\SafeBoot\Minimal" /f
            4⤵
              PID:4520
            • C:\Windows\system32\reg.exe
              reg delete "HKLM\System\CurrentControlSet\Control\SafeBoot\Network" /f
              4⤵
                PID:5000
              • C:\Windows\system32\taskkill.exe
                taskkill /f /im explorer.exe
                4⤵
                • Kills process with taskkill
                • Suspicious use of AdjustPrivilegeToken
                PID:400
              • C:\Windows\explorer.exe
                explorer.exe
                4⤵
                • Modifies Installed Components in the registry
                • Enumerates connected drives
                • Checks SCSI registry key(s)
                • Modifies registry class
                • Suspicious behavior: GetForegroundWindowSpam
                • Suspicious use of AdjustPrivilegeToken
                • Suspicious use of FindShellTrayWindow
                • Suspicious use of SendNotifyMessage
                • Suspicious use of SetWindowsHookEx
                PID:1736
              • C:\Windows\system32\takeown.exe
                takeown /f C:\Windows\System32\
                4⤵
                • Possible privilege escalation attempt
                • Modifies file permissions
                • Suspicious use of AdjustPrivilegeToken
                PID:1288
              • C:\Windows\system32\icacls.exe
                icacls C:\Windows\System32 /Grant Users:F
                4⤵
                • Possible privilege escalation attempt
                • Modifies file permissions
                PID:3064
              • C:\Windows\system32\takeown.exe
                takeown /f C:\Windows\
                4⤵
                • Possible privilege escalation attempt
                • Modifies file permissions
                • Suspicious use of AdjustPrivilegeToken
                PID:1380
              • C:\Windows\system32\icacls.exe
                icacls C:\Windows\ /Grant Users:F
                4⤵
                • Possible privilege escalation attempt
                • Modifies file permissions
                PID:4752
        • C:\Windows\SystemApps\Microsoft.Windows.StartMenuExperienceHost_cw5n1h2txyewy\StartMenuExperienceHost.exe
          "C:\Windows\SystemApps\Microsoft.Windows.StartMenuExperienceHost_cw5n1h2txyewy\StartMenuExperienceHost.exe" -ServerName:App.AppXywbrabmsek0gm3tkwpr5kwzbs55tkqay.mca
          1⤵
          • Modifies registry class
          • Suspicious use of SetWindowsHookEx
          PID:4756
        • C:\Windows\SystemApps\Microsoft.Windows.Search_cw5n1h2txyewy\SearchApp.exe
          "C:\Windows\SystemApps\Microsoft.Windows.Search_cw5n1h2txyewy\SearchApp.exe" -ServerName:CortanaUI.AppX8z9r6jm96hw4bsbneegw0kyxx296wr9t.mca
          1⤵
          • Enumerates system info in registry
          • Modifies registry class
          • Suspicious use of SetWindowsHookEx
          PID:2236

        Network

        MITRE ATT&CK Matrix ATT&CK v6

        Persistence

        Registry Run Keys / Startup Folder

        3
        T1060

        Privilege Escalation

        Bypass User Account Control

        1
        T1088

        Defense Evasion

        Bypass User Account Control

        1
        T1088

        Disabling Security Tools

        1
        T1089

        Modify Registry

        6
        T1112

        File Permissions Modification

        1
        T1222

        Discovery

        Query Registry

        4
        T1012

        System Information Discovery

        6
        T1082

        Peripheral Device Discovery

        2
        T1120

        Impact

        Defacement

        1
        T1491

        Replay Monitor

        Loading Replay Monitor...

        Downloads

        • C:\USERS\ADMIN\DESKTOP\BOLBI.TXT
          Filesize

          29B

          MD5

          b37ed35ef479e43f406429bc36e68ec4

          SHA1

          5e3ec88d9d13d136af28dea0d3c2529f5b6e3b82

          SHA256

          cc2b26f9e750e05cd680ef5721d9269fe4c8d23cabf500a2ff9065b6b4f7e08c

          SHA512

          d1c1ea6292d8113ce8f02a9ad3921e2d8632f036bdfa243bd6600a173ac0b1fc659f91b43c8d9ec0beaabb87d9654f5f231e98fde27e4d9bdfd5862ca5cb13b7

        • C:\Users\Public\Ghostroot\KillDora.bat
          Filesize

          482B

          MD5

          4f08159f1d70d41bf975e23230033a0f

          SHA1

          ea88d6fbdcf218e0e04a650d947250d8a3dfad40

          SHA256

          d6e7530e3879225bc21fc17859e5b5c71414375baac27bb361fd9162f4b49e0e

          SHA512

          958ac467e54d35c4ca5459853d661e49ea81efaa1ce3044114d577fcb757343a40ddb30b9f540cf9c100f05958a843bf312fa879c43bda7513643c824b318d6a

        • memory/400-138-0x0000000000000000-mapping.dmp
        • memory/1084-132-0x0000000000000000-mapping.dmp
        • memory/1288-140-0x0000000000000000-mapping.dmp
        • memory/1380-161-0x0000000000000000-mapping.dmp
        • memory/1736-139-0x0000000000000000-mapping.dmp
        • memory/2236-159-0x0000024D09820000-0x0000024D09920000-memory.dmp
          Filesize

          1024KB

        • memory/2236-165-0x0000024D0C3B0000-0x0000024D0C3D0000-memory.dmp
          Filesize

          128KB

        • memory/2236-176-0x0000024D0C634000-0x0000024D0C637000-memory.dmp
          Filesize

          12KB

        • memory/2236-175-0x0000024D0C634000-0x0000024D0C637000-memory.dmp
          Filesize

          12KB

        • memory/2236-152-0x0000024509360000-0x0000024509368000-memory.dmp
          Filesize

          32KB

        • memory/2236-154-0x0000024D0A830000-0x0000024D0A850000-memory.dmp
          Filesize

          128KB

        • memory/2236-156-0x0000024D0C4B0000-0x0000024D0C4D0000-memory.dmp
          Filesize

          128KB

        • memory/2236-174-0x0000024D0C634000-0x0000024D0C637000-memory.dmp
          Filesize

          12KB

        • memory/2236-160-0x0000024D0A870000-0x0000024D0A890000-memory.dmp
          Filesize

          128KB

        • memory/2236-173-0x0000024D0C634000-0x0000024D0C637000-memory.dmp
          Filesize

          12KB

        • memory/2236-171-0x0000024D0C630000-0x0000024D0C634000-memory.dmp
          Filesize

          16KB

        • memory/2236-170-0x0000024D0C630000-0x0000024D0C634000-memory.dmp
          Filesize

          16KB

        • memory/2236-167-0x0000024D0C630000-0x0000024D0C634000-memory.dmp
          Filesize

          16KB

        • memory/2236-168-0x0000024D0C630000-0x0000024D0C634000-memory.dmp
          Filesize

          16KB

        • memory/2236-169-0x0000024D0C630000-0x0000024D0C634000-memory.dmp
          Filesize

          16KB

        • memory/2432-135-0x0000000000000000-mapping.dmp
        • memory/3064-141-0x0000000000000000-mapping.dmp
        • memory/4520-136-0x0000000000000000-mapping.dmp
        • memory/4752-162-0x0000000000000000-mapping.dmp
        • memory/5000-137-0x0000000000000000-mapping.dmp
        • memory/5116-133-0x0000000000000000-mapping.dmp