Overview

overview

10

Static

static

10

ecea6b7727...7c.exe

windows7-x64

10

ecea6b7727...7c.exe

windows10-2004-x64

10

Analysis

  • max time kernel
    93s
  • max time network
    148s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20231130-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20231130-enlocale:en-usos:windows10-2004-x64system
  • submitted
    07/12/2023, 12:35

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General

  • Target
    ecea6b772742758a2240898ef772ca11aa9d870aec711cffab8994c23044117c.exe
  • Size 2.9MB
  • Sample231207-psrdvaaf79
  • SHA256 ecea6b772742758a2240898ef772ca11aa9d870aec711cffab8994c23044117c
  • MD5 SHA1 SHA512 SSDEEP
Score
10/10
blackcatevasionransomware

Malware Config

Extracted

Path

  • C:\RECOVER-kh1ftzx-FILES.txt

Ransom Note
  • >> What happened? Important files on your network was ENCRYPTED and now they have "kh1ftzx" extension. In order to recover your files you need to follow instructions below. >> Sensitive Data Sensitive data on your system was DOWNLOADED. If you DON'T WANT your sensitive data to be PUBLISHED you have to act quickly. Data includes: - Employees personal data, CVs, DL, SSN. - Complete network map including credentials for local and remote services. - Private financial information including: clients data, bills, budgets, annual reports, bank statements. - Manufacturing documents including: datagrams, schemas, drawings in solidworks format - And more... >> CAUTION DO NOT MODIFY ENCRYPTED FILES YOURSELF. DO NOT USE THIRD PARTY SOFTWARE TO RESTORE YOUR DATA. YOU MAY DAMAGE YOUR FILES, IT WILL RESULT IN PERMANENT DATA LOSS. >> What should I do next? Follow these simple steps to get everything back to normal: 1) Download and install Tor Browser from: https://torproject.org/ 2) Navigate to: http://rfosusl6qdm4zhoqbqnjxaloprld2qz35u77h4aap46rhwkouejsooqd.onion/?access-key=Sdzfi7%2Bwfijc5dMSoj2q1hqe%2FF0XHefoPXhE8zL1YQXlLb1TLxxYVAKEQS%2BWHI83jCQHbi9a%2BypynkRAp1ccN1G2Gc%2FV5o9okOkFgGaQ%2FdPbIK0oMFz2FyWXZ2Dw4DX2x2hqqYCZSfjGdctR1FmHd3x2oHW%2BquYMBUL4QTN%2BWhp6O2XzErgo7cFn4JalSv52d6rYvr7XR1ChHB%2B9mh6YD6%2FQoIg7Mqd7dsivTUi7rrJiJBKtmKR7xBNw%2B88Qso%2Bp6QrJbKQzjFi4Yqs4FJ0Sy%2B8CJG7F3RzZL0rOY9yVzqxmPStkvctP3K5KS%2FOZY5CpIa9IVbYek6NVdH5Jr2gkXg%3D%3D
URLs

  • http://rfosusl6qdm4zhoqbqnjxaloprld2qz35u77h4aap46rhwkouejsooqd.onion/?access-key=Sdzfi7%2Bwfijc5dMSoj2q1hqe%2FF0XHefoPXhE8zL1YQXlLb1TLxxYVAKEQS%2BWHI83jCQHbi9a%2BypynkRAp1ccN1G2Gc%2FV5o9okOkFgGaQ%2FdPbIK0oMFz2FyWXZ2Dw4DX2x2hqqYCZSfjGdctR1FmHd3x2oHW%2BquYMBUL4QTN%2BWhp6O2XzErgo7cFn4JalSv52d6rYvr7XR1ChHB%2B9mh6YD6%2FQoIg7Mqd7dsivTUi7rrJiJBKtmKR7xBNw%2B88Qso%2Bp6QrJbKQzjFi4Yqs4FJ0Sy%2B8CJG7F3RzZL0rOY9yVzqxmPStkvctP3K5KS%2FOZY5CpIa9IVbYek6NVdH5Jr2gkXg%3D%3D

Extracted

Family

  • blackcat

Attributes
  • enable_network_discovery

    true

  • enable_self_propagation

    true

  • enable_set_wallpaper

    true

  • extension

    kh1ftzx

  • note_file_name

    RECOVER-${EXTENSION}-FILES.txt

  • note_full_text

    >> What happened? Important files on your network was ENCRYPTED and now they have "${EXTENSION}" extension. In order to recover your files you need to follow instructions below. >> Sensitive Data Sensitive data on your system was DOWNLOADED. If you DON'T WANT your sensitive data to be PUBLISHED you have to act quickly. Data includes: - Employees personal data, CVs, DL, SSN. - Complete network map including credentials for local and remote services. - Private financial information including: clients data, bills, budgets, annual reports, bank statements. - Manufacturing documents including: datagrams, schemas, drawings in solidworks format - And more... >> CAUTION DO NOT MODIFY ENCRYPTED FILES YOURSELF. DO NOT USE THIRD PARTY SOFTWARE TO RESTORE YOUR DATA. YOU MAY DAMAGE YOUR FILES, IT WILL RESULT IN PERMANENT DATA LOSS. >> What should I do next? Follow these simple steps to get everything back to normal: 1) Download and install Tor Browser from: https://torproject.org/ 2) Navigate to: http://rfosusl6qdm4zhoqbqnjxaloprld2qz35u77h4aap46rhwkouejsooqd.onion/?access-key=${ACCESS_KEY}

rsa_pubkey.plain

Signatures

  • BlackCat

    A Rust-based ransomware sold as RaaS first seen in late 2021.

    ransomwareblackcat
  • Deletes shadow copies 2 TTPs

    Ransomware often targets backup files to inhibit system recovery.

    ransomware
  • Modifies boot configuration data using bcdedit 1 TTPs 2 IoCs
    ransomwareevasion
  • Renames multiple (6322) files with added filename extension

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

    ransomware
  • 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 2 IoCs
    ransomware
  • Drops file in Program Files directory 64 IoCs
  • Interacts with shadow copies 2 TTPs 2 IoCs

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

    ransomware
  • Modifies Control Panel 1 IoCs
    evasion
  • Suspicious behavior: EnumeratesProcesses 32 IoCs
  • Suspicious use of AdjustPrivilegeToken 64 IoCs
  • Suspicious use of WriteProcessMemory 64 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\ecea6b772742758a2240898ef772ca11aa9d870aec711cffab8994c23044117c.exe
    C:\Users\Admin\AppData\Local\Temp\ecea6b772742758a2240898ef772ca11aa9d870aec711cffab8994c23044117c.exe --access-token xx
    1⤵
    • Enumerates connected drives
    • Sets desktop wallpaper using registry
    • Drops file in Program Files directory
    • Modifies Control Panel
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:3744
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\system32\cmd.exe" /c "wmic csproduct get UUID"
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:4664
      • C:\Windows\SysWOW64\Wbem\WMIC.exe
        wmic csproduct get UUID
        3⤵
        • Suspicious use of AdjustPrivilegeToken
        PID:2384
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\system32\cmd.exe" /c "fsutil behavior set SymlinkEvaluation R2L:1"
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:1456
      • C:\Windows\SysWOW64\fsutil.exe
        fsutil behavior set SymlinkEvaluation R2L:1
        3⤵
          PID:376
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\system32\cmd.exe" /c "fsutil behavior set SymlinkEvaluation R2R:1"
        2⤵
        • Suspicious use of WriteProcessMemory
        PID:3852
        • C:\Windows\SysWOW64\fsutil.exe
          fsutil behavior set SymlinkEvaluation R2R:1
          3⤵
            PID:2272
        • C:\Windows\SysWOW64\cmd.exe
          "C:\Windows\system32\cmd.exe" /c "iisreset.exe /stop"
          2⤵
            PID:1368
          • C:\Windows\SysWOW64\cmd.exe
            "C:\Windows\system32\cmd.exe" /c "reg add HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\LanmanServer\Parameters /v MaxMpxCt /d 65535 /t REG_DWORD /f"
            2⤵
            • Suspicious use of WriteProcessMemory
            PID:1144
            • C:\Windows\SysWOW64\reg.exe
              reg add HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\LanmanServer\Parameters /v MaxMpxCt /d 65535 /t REG_DWORD /f
              3⤵
                PID:1880
            • C:\Windows\system32\cmd.exe
              "C:\Windows\system32\cmd.exe" /c "vssadmin.exe Delete Shadows /all /quiet"
              2⤵
              • Suspicious use of WriteProcessMemory
              PID:5068
              • C:\Windows\system32\vssadmin.exe
                vssadmin.exe Delete Shadows /all /quiet
                3⤵
                • Interacts with shadow copies
                PID:3412
            • C:\Windows\SysWOW64\cmd.exe
              "C:\Windows\system32\cmd.exe" /c "arp -a"
              2⤵
              • Suspicious use of WriteProcessMemory
              PID:2424
              • C:\Windows\SysWOW64\ARP.EXE
                arp -a
                3⤵
                  PID:4896
              • C:\Windows\system32\cmd.exe
                "C:\Windows\system32\cmd.exe" /c "wmic.exe Shadowcopy Delete"
                2⤵
                • Suspicious use of WriteProcessMemory
                PID:2760
                • C:\Windows\System32\Wbem\WMIC.exe
                  wmic.exe Shadowcopy Delete
                  3⤵
                    PID:1612
                • C:\Windows\system32\cmd.exe
                  "C:\Windows\system32\cmd.exe" /c "bcdedit /set {default}"
                  2⤵
                  • Suspicious use of WriteProcessMemory
                  PID:432
                  • C:\Windows\system32\bcdedit.exe
                    bcdedit /set {default}
                    3⤵
                    • Modifies boot configuration data using bcdedit
                    PID:1296
                • C:\Windows\system32\cmd.exe
                  "C:\Windows\system32\cmd.exe" /c "bcdedit /set {default} recoveryenabled No"
                  2⤵
                  • Suspicious use of WriteProcessMemory
                  PID:3840
                  • C:\Windows\system32\bcdedit.exe
                    bcdedit /set {default} recoveryenabled No
                    3⤵
                    • Modifies boot configuration data using bcdedit
                    PID:2588
                • C:\Windows\system32\cmd.exe
                  "C:\Windows\system32\cmd.exe" /c "cmd.exe /c for /F \"tokens=*\" %1 in ('wevtutil.exe el') DO wevtutil.exe cl \"%1\""
                  2⤵
                  • Suspicious use of WriteProcessMemory
                  PID:1408
                  • C:\Windows\system32\cmd.exe
                    cmd.exe /c for /F \"tokens=*\" %1 in ('wevtutil.exe el') DO wevtutil.exe cl \"%1\"
                    3⤵
                      PID:3864
                  • C:\Windows\system32\cmd.exe
                    "C:\Windows\system32\cmd.exe" /c "vssadmin.exe Delete Shadows /all /quiet"
                    2⤵
                    • Suspicious use of WriteProcessMemory
                    PID:5244
                    • C:\Windows\system32\vssadmin.exe
                      vssadmin.exe Delete Shadows /all /quiet
                      3⤵
                      • Interacts with shadow copies
                      PID:752
                  • C:\Windows\system32\cmd.exe
                    "C:\Windows\system32\cmd.exe" /c "wmic.exe Shadowcopy Delete"
                    2⤵
                    • Suspicious use of WriteProcessMemory
                    PID:5884
                    • C:\Windows\System32\Wbem\WMIC.exe
                      wmic.exe Shadowcopy Delete
                      3⤵
                        PID:4208
                    • C:\Windows\system32\cmd.exe
                      "C:\Windows\system32\cmd.exe" /c "cmd.exe /c for /F \"tokens=*\" %1 in ('wevtutil.exe el') DO wevtutil.exe cl \"%1\""
                      2⤵
                      • Suspicious use of WriteProcessMemory
                      PID:828
                      • C:\Windows\system32\cmd.exe
                        cmd.exe /c for /F \"tokens=*\" %1 in ('wevtutil.exe el') DO wevtutil.exe cl \"%1\"
                        3⤵
                          PID:1528
                    • C:\Windows\system32\vssvc.exe
                      C:\Windows\system32\vssvc.exe
                      1⤵
                        PID:4368
                      • C:\Windows\system32\vssvc.exe
                        C:\Windows\system32\vssvc.exe
                        1⤵
                          PID:6300

                        Network

                              MITRE ATT&CK Enterprise v15

                              Replay Monitor

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                              Downloads

                              RECOVER-kh1ftzx-FILES.txt
                              • Path C:\RECOVER-kh1ftzx-FILES.txt
                              • Size 1KB
                              • SHA256 236f5818658bb2ae57813cbe7c33207a61356995419ad19d9b77375d393b4817
                              • MD5 SHA1 SHA512
                              Submit Download

                              RECOVER-kh1ftzx-FILES.txt.png
                              • Path C:\Users\Admin\Desktop\RECOVER-kh1ftzx-FILES.txt.png
                              • Size 1KB
                              • SHA256 586a861604dc00f0308a4370f4681e146672f6df13a0fa6f2caef7dba320c0da
                              • MD5 SHA1 SHA512
                              Submit Download

                              memory/3744-17163-0x0000000000400000-0x00000000006F6000-memory.dmp
                              Download

                              memory/3744-24328-0x0000000000400000-0x00000000006F6000-memory.dmp
                              Download

                              memory/3744-25247-0x0000000000400000-0x00000000006F6000-memory.dmp
                              Download