Analysis

  • max time kernel
    150s
  • max time network
    152s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20230220-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20230220-enlocale:en-usos:windows10-2004-x64system
  • submitted
    05-05-2023 20:56

General

  • Target

    rundll64.exe

  • Size

    236KB

  • MD5

    4165a3dba3c7ac26b225f8623f70ebaa

  • SHA1

    587df43d63da7dfd726a4bb8f39877647cc07da0

  • SHA256

    523d97331fcef84ff767dbb01836766d8b1be9bbeb3d76e9fda3a02ad46fd976

  • SHA512

    43ad74651aad95f16bd17f6fea857534c6c6502cb0c06262092e7b10ab59a27b663565668d6fd4436c72a114f632ab6940fc4f1914d165eba7e5a8a8b5743b8e

  • SSDEEP

    6144:qb/A0SeQu0hL2cyBt2iOjese1HSCRhECwt6:q8D5P2ICsDCRhQ6

Malware Config

Signatures

  • Phobos

    Phobos ransomware appeared at the beginning of 2019.

  • Deletes shadow copies 2 TTPs

    Ransomware often targets backup files to inhibit system recovery.

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

    Uses wbadmin.exe to inhibit system recovery.

  • Modifies Windows Firewall 1 TTPs 2 IoCs
  • Drops startup file 1 IoCs
  • Reads user/profile data of web browsers 2 TTPs

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

  • Adds Run key to start application 2 TTPs 2 IoCs
  • Drops desktop.ini file(s) 2 IoCs
  • Drops file in Program Files directory 64 IoCs
  • Program crash 1 IoCs
  • 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.

  • Suspicious behavior: EnumeratesProcesses 64 IoCs
  • Suspicious use of AdjustPrivilegeToken 49 IoCs
  • Suspicious use of WriteProcessMemory 18 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.

  • Uses Volume Shadow Copy service COM API

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

Processes

  • C:\Users\Admin\AppData\Local\Temp\rundll64.exe
    "C:\Users\Admin\AppData\Local\Temp\rundll64.exe"
    1⤵
    • Drops startup file
    • Adds Run key to start application
    • Drops desktop.ini file(s)
    • Drops file in Program Files directory
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:3340
    • C:\Users\Admin\AppData\Local\Temp\rundll64.exe
      "C:\Users\Admin\AppData\Local\Temp\rundll64.exe"
      2⤵
        PID:2832
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 2832 -s 460
          3⤵
          • Program crash
          PID:4684
      • C:\Windows\system32\cmd.exe
        "C:\Windows\system32\cmd.exe"
        2⤵
        • Suspicious use of WriteProcessMemory
        PID:4180
        • C:\Windows\system32\netsh.exe
          netsh advfirewall set currentprofile state off
          3⤵
          • Modifies Windows Firewall
          PID:4676
        • C:\Windows\system32\netsh.exe
          netsh firewall set opmode mode=disable
          3⤵
          • Modifies Windows Firewall
          PID:1244
      • C:\Windows\system32\cmd.exe
        "C:\Windows\system32\cmd.exe"
        2⤵
        • Suspicious use of WriteProcessMemory
        PID:2012
        • C:\Windows\system32\vssadmin.exe
          vssadmin delete shadows /all /quiet
          3⤵
          • Interacts with shadow copies
          PID:4624
        • C:\Windows\System32\Wbem\WMIC.exe
          wmic shadowcopy delete
          3⤵
          • Suspicious use of AdjustPrivilegeToken
          PID:5048
        • C:\Windows\system32\bcdedit.exe
          bcdedit /set {default} bootstatuspolicy ignoreallfailures
          3⤵
          • Modifies boot configuration data using bcdedit
          PID:3788
        • C:\Windows\system32\bcdedit.exe
          bcdedit /set {default} recoveryenabled no
          3⤵
          • Modifies boot configuration data using bcdedit
          PID:3840
        • C:\Windows\system32\wbadmin.exe
          wbadmin delete catalog -quiet
          3⤵
          • Deletes backup catalog
          PID:1224
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -pss -s 432 -p 2832 -ip 2832
      1⤵
        PID:3740
      • C:\Windows\system32\vssvc.exe
        C:\Windows\system32\vssvc.exe
        1⤵
        • Suspicious use of AdjustPrivilegeToken
        PID:3820
      • C:\Windows\system32\wbengine.exe
        "C:\Windows\system32\wbengine.exe"
        1⤵
        • Suspicious use of AdjustPrivilegeToken
        PID:4104
      • C:\Windows\System32\vdsldr.exe
        C:\Windows\System32\vdsldr.exe -Embedding
        1⤵
          PID:4912
        • C:\Windows\System32\vds.exe
          C:\Windows\System32\vds.exe
          1⤵
          • Checks SCSI registry key(s)
          PID:1200

        Network

        MITRE ATT&CK Enterprise v6

        Replay Monitor

        Loading Replay Monitor...

        Downloads

        • C:\Program Files\7-Zip\7-zip32.dll

          Filesize

          49KB

          MD5

          2f244a56091c9705794e92e6bcc38058

          SHA1

          3f2b518be764f29c66ba8564d1be8f4309cce747

          SHA256

          e322feefa8d4c76d8749f88c9b877e3e119418c4ac0b18a8cfb7260638cc588d

          SHA512

          3ee3835abfec9c2db4ba1f33b5e59db2400e712d5dd7cde82a12889ea1beab8ac85b923ec0447e81b3d2ce3ebd14922882653f5bcdcc81a29f225acfa4872572

        • memory/2832-135-0x0000000000400000-0x00000000047C2000-memory.dmp

          Filesize

          67.8MB

        • memory/3340-184-0x0000000000400000-0x00000000047C2000-memory.dmp

          Filesize

          67.8MB

        • memory/3340-214-0x0000000000400000-0x00000000047C2000-memory.dmp

          Filesize

          67.8MB

        • memory/3340-140-0x0000000000400000-0x00000000047C2000-memory.dmp

          Filesize

          67.8MB

        • memory/3340-150-0x0000000000400000-0x00000000047C2000-memory.dmp

          Filesize

          67.8MB

        • memory/3340-134-0x00000000001C0000-0x00000000001CF000-memory.dmp

          Filesize

          60KB

        • memory/3340-171-0x0000000000400000-0x00000000047C2000-memory.dmp

          Filesize

          67.8MB

        • memory/3340-133-0x0000000000030000-0x000000000003C000-memory.dmp

          Filesize

          48KB

        • memory/3340-138-0x0000000000400000-0x00000000047C2000-memory.dmp

          Filesize

          67.8MB

        • memory/3340-441-0x0000000000400000-0x00000000047C2000-memory.dmp

          Filesize

          67.8MB

        • memory/3340-496-0x0000000000400000-0x00000000047C2000-memory.dmp

          Filesize

          67.8MB

        • memory/3340-515-0x0000000000400000-0x00000000047C2000-memory.dmp

          Filesize

          67.8MB

        • memory/3340-541-0x0000000000400000-0x00000000047C2000-memory.dmp

          Filesize

          67.8MB

        • memory/3340-818-0x0000000000400000-0x00000000047C2000-memory.dmp

          Filesize

          67.8MB

        • memory/3340-937-0x0000000000400000-0x00000000047C2000-memory.dmp

          Filesize

          67.8MB

        • memory/3340-944-0x0000000000400000-0x00000000047C2000-memory.dmp

          Filesize

          67.8MB

        • memory/3340-951-0x0000000000400000-0x00000000047C2000-memory.dmp

          Filesize

          67.8MB