Analysis

  • max time kernel
    150s
  • max time network
    155s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20231127-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20231127-enlocale:en-usos:windows10-2004-x64system
  • submitted
    29/11/2023, 01:06

General

  • Target
    64CO.exe
  • Size 1.2MB
  • Sample231129-bf6fcadf37
  • SHA256 033b4950a8f249b20eb86ec6f8f2ea0a1567bb164289d1aa7fb0ba51f9bbe46c
  • MD5 SHA1 SHA512 SSDEEP

Malware Config

Signatures

  • Deletes shadow copies 2 TTPs

    Ransomware often targets backup files to inhibit system recovery.

  • Modifies boot configuration data using bcdedit 1 TTPs 2 IoCs
  • Renames multiple (629) files with added filename extension

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

  • Deletes System State backups 3 TTPs 2 IoCs

    Uses wbadmin.exe to inhibit system recovery.

  • Drops file in Drivers directory 12 IoCs
  • Checks computer location settings 2 TTPs 1 IoCs

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

  • 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 1 IoCs
  • Drops desktop.ini file(s) 1 IoCs
  • Enumerates connected drives 3 TTPs 39 IoCs

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

  • Drops file in System32 directory 64 IoCs
  • Drops file in Program Files directory 52 IoCs
  • Drops file in Windows directory 64 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Interacts with shadow copies 2 TTPs 13 IoCs

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

  • Suspicious behavior: EnumeratesProcesses 64 IoCs
  • Suspicious use of AdjustPrivilegeToken 24 IoCs
  • Suspicious use of WriteProcessMemory 38 IoCs
  • System policy modification 1 TTPs 1 IoCs
  • 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\64CO.exe
    "C:\Users\Admin\AppData\Local\Temp\64CO.exe"
    1⤵
    • Drops file in Drivers directory
    • Checks computer location settings
    • Adds Run key to start application
    • Drops desktop.ini file(s)
    • Enumerates connected drives
    • Drops file in System32 directory
    • Drops file in Program Files directory
    • Drops file in Windows directory
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of WriteProcessMemory
    • System policy modification
    PID:4880
    • C:\Windows\SYSTEM32\vssadmin.exe
      vssadmin.exe Resize ShadowStorage /for=c: /on=c: /maxsize=401MB
      2⤵
      • Interacts with shadow copies
      PID:3564
    • C:\Windows\SYSTEM32\vssadmin.exe
      vssadmin.exe Resize ShadowStorage /for=c: /on=c: /maxsize=unbounded
      2⤵
      • Interacts with shadow copies
      PID:2024
    • C:\Windows\SYSTEM32\vssadmin.exe
      vssadmin.exe Resize ShadowStorage /for=d: /on=d: /maxsize=401MB
      2⤵
      • Enumerates connected drives
      • Interacts with shadow copies
      PID:4156
    • C:\Windows\SYSTEM32\vssadmin.exe
      vssadmin.exe Resize ShadowStorage /for=d: /on=d: /maxsize=unbounded
      2⤵
      • Enumerates connected drives
      • Interacts with shadow copies
      PID:2832
    • C:\Windows\SYSTEM32\vssadmin.exe
      vssadmin.exe Resize ShadowStorage /for=e: /on=e: /maxsize=401MB
      2⤵
      • Enumerates connected drives
      • Interacts with shadow copies
      PID:2360
    • C:\Windows\SYSTEM32\vssadmin.exe
      vssadmin.exe Resize ShadowStorage /for=e: /on=e: /maxsize=unbounded
      2⤵
      • Enumerates connected drives
      • Interacts with shadow copies
      PID:900
    • C:\Windows\SYSTEM32\vssadmin.exe
      vssadmin.exe Resize ShadowStorage /for=f: /on=f: /maxsize=401MB
      2⤵
      • Enumerates connected drives
      • Interacts with shadow copies
      PID:1760
    • C:\Windows\SYSTEM32\vssadmin.exe
      vssadmin.exe Resize ShadowStorage /for=f: /on=f: /maxsize=unbounded
      2⤵
      • Enumerates connected drives
      • Interacts with shadow copies
      PID:1908
    • C:\Windows\SYSTEM32\vssadmin.exe
      vssadmin.exe Resize ShadowStorage /for=g: /on=g: /maxsize=401MB
      2⤵
      • Enumerates connected drives
      • Interacts with shadow copies
      PID:4064
    • C:\Windows\SYSTEM32\vssadmin.exe
      vssadmin.exe Resize ShadowStorage /for=g: /on=g: /maxsize=unbounded
      2⤵
      • Enumerates connected drives
      • Interacts with shadow copies
      PID:3824
    • C:\Windows\SYSTEM32\vssadmin.exe
      vssadmin.exe Resize ShadowStorage /for=h: /on=h: /maxsize=401MB
      2⤵
      • Enumerates connected drives
      • Interacts with shadow copies
      PID:4164
    • C:\Windows\SYSTEM32\vssadmin.exe
      vssadmin.exe Resize ShadowStorage /for=h: /on=h: /maxsize=unbounded
      2⤵
      • Enumerates connected drives
      • Interacts with shadow copies
      PID:2932
    • C:\Windows\SYSTEM32\vssadmin.exe
      vssadmin.exe Delete Shadows /All /Quiet
      2⤵
      • Interacts with shadow copies
      PID:3384
    • C:\Windows\SYSTEM32\bcdedit.exe
      bcdedit.exe /set {default} recoveryenabled No
      2⤵
      • Modifies boot configuration data using bcdedit
      PID:4444
    • C:\Windows\SYSTEM32\bcdedit.exe
      bcdedit.exe /set {default} bootstatuspolicy ignoreallfailures
      2⤵
      • Modifies boot configuration data using bcdedit
      PID:4876
    • C:\Windows\SYSTEM32\wbadmin.exe
      wbadmin DELETE SYSTEMSTATEBACKUP
      2⤵
      • Deletes System State backups
      • Drops file in Windows directory
      PID:4360
    • C:\Windows\SYSTEM32\wbadmin.exe
      wbadmin DELETE SYSTEMSTATEBACKUP -deleteOldest
      2⤵
      • Deletes System State backups
      • Drops file in Windows directory
      PID:740
    • C:\Windows\System32\Wbem\wmic.exe
      wmic.exe SHADOWCOPY /nointeractive
      2⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:2284
    • C:\Windows\system32\cmd.exe
      "C:\Windows\system32\cmd.exe" /c del C:\Users\Admin\AppData\Local\Temp\64CO.exe >> NUL
      2⤵
        PID:4404
    • C:\Windows\system32\vssvc.exe
      C:\Windows\system32\vssvc.exe
      1⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:3696
    • C:\Windows\system32\svchost.exe
      C:\Windows\system32\svchost.exe -k NetworkService -p -s CryptSvc
      1⤵
      • Drops file in System32 directory
      PID:64

    Network

          MITRE ATT&CK Enterprise v15

          Replay Monitor

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          Downloads

          398EE64D66758B5715368AA94044B13A.keversen

          • Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\398EE64D66758B5715368AA94044B13A.keversen
          • Size 710B
          • SHA256 ccc671deb21fdf5ee401574f6573990509b11a1c1d3dda6aa61e8f85be7816be
          • MD5 SHA1 SHA512

          57C8EDB95DF3F0AD4EE2DC2B8CFD4157.keversen

          • Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\57C8EDB95DF3F0AD4EE2DC2B8CFD4157.keversen
          • Size 850B
          • SHA256 e3f71c19d7a60e2030c57e3d77183da83e7ac3e51707785d67c4a1636e25e748
          • MD5 SHA1 SHA512

          77EC63BDA74BD0D0E0426DC8F8008506.keversen

          • Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\77EC63BDA74BD0D0E0426DC8F8008506.keversen
          • Size 842B
          • SHA256 e4799dc078e016952719338909f339b3ac38019a0a05206ce2e16393b0f5e6fc
          • MD5 SHA1 SHA512

          C86BD7751D53F10F65AAAD66BBDF33C7.keversen

          • Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\C86BD7751D53F10F65AAAD66BBDF33C7.keversen
          • Size 770B
          • SHA256 e5369e24eb34a96813bd9daa62fb63464640ff67cc605a4173a4a38b72709e2b
          • MD5 SHA1 SHA512

          FB0D848F74F70BB2EAA93746D24D9749.keversen

          • Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\FB0D848F74F70BB2EAA93746D24D9749.keversen
          • Size 842B
          • SHA256 0871cc581cd8610812795430819cbf48a081a7be7876674a5b7af0ea327247d8
          • MD5 SHA1 SHA512

          dberr.txt

          • Path C:\Windows\System32\catroot2\dberr.txt
          • Size 149KB
          • SHA256 4f129e2ab632a5d65ac76389303df9de0e5df39ad187b49b9bdc59a985cd3dad
          • MD5 SHA1 SHA512 SSDEEP

          edb.log

          • Path C:\Windows\System32\catroot2\edb.log
          • Size 2.0MB
          • SHA256 f1e74880a14afba83a83e5274bfc8d18d3a84f441976dcf781a9ef86de147f5d
          • MD5 SHA1 SHA512 SSDEEP

          57C8EDB95DF3F0AD4EE2DC2B8CFD4157

          • Path C:\Windows\System32\config\systemprofile\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\57C8EDB95DF3F0AD4EE2DC2B8CFD4157
          • Size 814B
          • SHA256 598e6c630e279f3dd1ee4fcfd77bdfce374a839fdbf5941b2ebece5c337f286f
          • MD5 SHA1 SHA512

          memory/64-813-0x000001FE3C330000-0x000001FE3C331000-memory.dmp

          memory/64-850-0x000001FE3EC70000-0x000001FE3EC71000-memory.dmp

          memory/64-784-0x000001FE3B060000-0x000001FE3B061000-memory.dmp

          memory/64-785-0x000001FE3B190000-0x000001FE3B191000-memory.dmp

          memory/64-786-0x000001FE3B1B0000-0x000001FE3B1B1000-memory.dmp

          memory/64-779-0x000001FE3AF80000-0x000001FE3AF81000-memory.dmp

          memory/64-789-0x000001FE3B2E0000-0x000001FE3B2E1000-memory.dmp

          memory/64-790-0x000001FE3BF70000-0x000001FE3BF71000-memory.dmp

          memory/64-794-0x000001FE3C850000-0x000001FE3C851000-memory.dmp

          memory/64-801-0x000001FE3C850000-0x000001FE3C851000-memory.dmp

          memory/64-803-0x000001FE3CEF0000-0x000001FE3CEF1000-memory.dmp

          memory/64-804-0x000001FE3DBD0000-0x000001FE3DBD1000-memory.dmp

          memory/64-805-0x000001FE3DBD0000-0x000001FE3DBD1000-memory.dmp

          memory/64-807-0x000001FE3B6B0000-0x000001FE3B6B1000-memory.dmp

          memory/64-811-0x000001FE3E490000-0x000001FE3E491000-memory.dmp

          memory/64-812-0x000001FE3E490000-0x000001FE3E491000-memory.dmp

          memory/64-729-0x000001FE363A0000-0x000001FE363B0000-memory.dmp

          memory/64-815-0x000001FE3E960000-0x000001FE3E961000-memory.dmp

          memory/64-843-0x000001FE3EC70000-0x000001FE3EC71000-memory.dmp

          memory/64-782-0x000001FE3B060000-0x000001FE3B061000-memory.dmp

          memory/64-858-0x000001FE3F650000-0x000001FE3F651000-memory.dmp

          memory/64-868-0x000001FE3BA70000-0x000001FE3BA71000-memory.dmp

          memory/64-875-0x000001FE3BA70000-0x000001FE3BA71000-memory.dmp

          memory/64-1015-0x000001FE40660000-0x000001FE40661000-memory.dmp

          memory/64-1016-0x000001FE410B0000-0x000001FE410B1000-memory.dmp

          memory/64-1017-0x000001FE410B0000-0x000001FE410B1000-memory.dmp

          memory/64-1019-0x000001FE415A0000-0x000001FE415A1000-memory.dmp

          memory/64-1020-0x000001FE42610000-0x000001FE42611000-memory.dmp

          memory/64-1021-0x000001FE40970000-0x000001FE40971000-memory.dmp

          memory/64-1023-0x000001FE42650000-0x000001FE42651000-memory.dmp

          memory/64-1033-0x000001FE43010000-0x000001FE43011000-memory.dmp

          memory/64-1037-0x000001FE42030000-0x000001FE42031000-memory.dmp

          memory/64-1038-0x000001FE42030000-0x000001FE42031000-memory.dmp

          memory/64-1040-0x000001FE443F0000-0x000001FE443F1000-memory.dmp

          memory/64-778-0x000001FE3AF60000-0x000001FE3AF61000-memory.dmp

          memory/64-777-0x000001FE3AE20000-0x000001FE3AE21000-memory.dmp

          memory/64-775-0x000001FE3AE20000-0x000001FE3AE21000-memory.dmp

          memory/64-753-0x000001FE3AA40000-0x000001FE3AA41000-memory.dmp

          memory/64-745-0x000001FE3AD80000-0x000001FE3AD81000-memory.dmp

          memory/64-735-0x000001FE36950000-0x000001FE36960000-memory.dmp