Resubmissions

12-01-2023 20:01

230112-yrh6hsae52 10

07-01-2023 04:41

230107-fa3jqagb8t 10

07-01-2023 04:21

230107-eynj2acf87 10

Analysis

  • max time kernel
    60s
  • max time network
    62s
  • platform
    windows7_x64
  • resource
    win7-20220812-en
  • resource tags

    arch:x64arch:x86image:win7-20220812-enlocale:en-usos:windows7-x64system
  • submitted
    07-01-2023 04:41

General

  • Target

    0a0a64f3c4fa7d960be983aa0a7d0ce8.exe

  • Size

    3.8MB

  • MD5

    0a0a64f3c4fa7d960be983aa0a7d0ce8

  • SHA1

    b597c7397ecaff7c5c1aa27f5124fc7b8a94e643

  • SHA256

    6d95012691b58c36574d4b1061b07e0a8340909664908e991fad91028777fdd1

  • SHA512

    ef04e3eb8f2b10dae6845b97fa66086c3d02c5508adcd1923a93975c88f1ad0f80f984b563c36c4868276670b1dee9e11ae3c57faf7b0509118d121d920df7d4

  • SSDEEP

    98304:F7b3a0t2TiPhx6Sp+ybfnDA4qo34n1oO:FH3Z8cp+gDZ4n1

Malware Config

Signatures

  • DcRat 10 IoCs

    DarkCrystal(DC) is a new .NET RAT active since June 2019 capable of loading additional plugins.

  • Modifies WinLogon for persistence 2 TTPs 3 IoCs
  • Process spawned unexpected child process 9 IoCs

    This typically indicates the parent process was compromised via an exploit or macro.

  • UAC bypass 3 TTPs 6 IoCs
  • DCRat payload 4 IoCs

    Detects payload of DCRat, commonly dropped by NSIS installers.

  • Executes dropped EXE 1 IoCs
  • Adds Run key to start application 2 TTPs 6 IoCs
  • Checks whether UAC is enabled 1 TTPs 4 IoCs
  • Looks up external IP address via web service 2 IoCs

    Uses a legitimate IP lookup service to find the infected system's external IP.

  • Enumerates physical storage devices 1 TTPs

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

  • Creates scheduled task(s) 1 TTPs 9 IoCs

    Schtasks is often used by malware for persistence or to perform post-infection execution.

  • Suspicious behavior: EnumeratesProcesses 13 IoCs
  • Suspicious use of AdjustPrivilegeToken 8 IoCs
  • Suspicious use of WriteProcessMemory 21 IoCs
  • System policy modification 1 TTPs 6 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\0a0a64f3c4fa7d960be983aa0a7d0ce8.exe
    "C:\Users\Admin\AppData\Local\Temp\0a0a64f3c4fa7d960be983aa0a7d0ce8.exe"
    1⤵
    • DcRat
    • Modifies WinLogon for persistence
    • UAC bypass
    • Adds Run key to start application
    • Checks whether UAC is enabled
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    • System policy modification
    PID:1016
    • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      "powershell" -Command Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp\0a0a64f3c4fa7d960be983aa0a7d0ce8.exe'
      2⤵
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:2000
    • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      "powershell" -Command Add-MpPreference -ExclusionPath 'C:\Users\All Users\Favorites\lsass.exe'
      2⤵
        PID:788
      • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        "powershell" -Command Add-MpPreference -ExclusionPath 'C:\Recovery\c0f67622-1a8a-11ed-ae9f-b21da26d38ed\smss.exe'
        2⤵
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        PID:1608
      • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        "powershell" -Command Add-MpPreference -ExclusionPath 'C:\Recovery\c0f67622-1a8a-11ed-ae9f-b21da26d38ed\sppsvc.exe'
        2⤵
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        PID:904
      • C:\Users\All Users\Favorites\lsass.exe
        "C:\Users\All Users\Favorites\lsass.exe"
        2⤵
        • UAC bypass
        • Executes dropped EXE
        • Checks whether UAC is enabled
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        • System policy modification
        PID:1452
        • C:\Windows\System32\WScript.exe
          "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\8779be4c-4877-451e-a356-2867dba7e75a.vbs"
          3⤵
            PID:1700
          • C:\Windows\System32\WScript.exe
            "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\4771eca1-baeb-4f85-bc5a-bfcaadb7b9e2.vbs"
            3⤵
              PID:1104
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "lsassl" /sc MINUTE /mo 8 /tr "'C:\Users\All Users\Favorites\lsass.exe'" /f
          1⤵
          • DcRat
          • Process spawned unexpected child process
          • Creates scheduled task(s)
          PID:620
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "lsass" /sc ONLOGON /tr "'C:\Users\All Users\Favorites\lsass.exe'" /rl HIGHEST /f
          1⤵
          • DcRat
          • Process spawned unexpected child process
          • Creates scheduled task(s)
          PID:440
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "lsassl" /sc MINUTE /mo 7 /tr "'C:\Users\All Users\Favorites\lsass.exe'" /rl HIGHEST /f
          1⤵
          • DcRat
          • Process spawned unexpected child process
          • Creates scheduled task(s)
          PID:1536
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "smsss" /sc MINUTE /mo 13 /tr "'C:\Recovery\c0f67622-1a8a-11ed-ae9f-b21da26d38ed\smss.exe'" /f
          1⤵
          • DcRat
          • Process spawned unexpected child process
          • Creates scheduled task(s)
          PID:1816
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "smss" /sc ONLOGON /tr "'C:\Recovery\c0f67622-1a8a-11ed-ae9f-b21da26d38ed\smss.exe'" /rl HIGHEST /f
          1⤵
          • DcRat
          • Process spawned unexpected child process
          • Creates scheduled task(s)
          PID:540
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "smsss" /sc MINUTE /mo 9 /tr "'C:\Recovery\c0f67622-1a8a-11ed-ae9f-b21da26d38ed\smss.exe'" /rl HIGHEST /f
          1⤵
          • DcRat
          • Process spawned unexpected child process
          • Creates scheduled task(s)
          PID:1372
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "sppsvcs" /sc MINUTE /mo 6 /tr "'C:\Recovery\c0f67622-1a8a-11ed-ae9f-b21da26d38ed\sppsvc.exe'" /f
          1⤵
          • DcRat
          • Process spawned unexpected child process
          • Creates scheduled task(s)
          PID:968
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "sppsvc" /sc ONLOGON /tr "'C:\Recovery\c0f67622-1a8a-11ed-ae9f-b21da26d38ed\sppsvc.exe'" /rl HIGHEST /f
          1⤵
          • DcRat
          • Process spawned unexpected child process
          • Creates scheduled task(s)
          PID:1284
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "sppsvcs" /sc MINUTE /mo 11 /tr "'C:\Recovery\c0f67622-1a8a-11ed-ae9f-b21da26d38ed\sppsvc.exe'" /rl HIGHEST /f
          1⤵
          • DcRat
          • Process spawned unexpected child process
          • Creates scheduled task(s)
          PID:1732
        • C:\Windows\system32\vssvc.exe
          C:\Windows\system32\vssvc.exe
          1⤵
          • Suspicious use of AdjustPrivilegeToken
          PID:1036

        Network

        MITRE ATT&CK Enterprise v6

        Replay Monitor

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        Downloads

        • C:\Users\Admin\AppData\Local\Temp\4771eca1-baeb-4f85-bc5a-bfcaadb7b9e2.vbs

          Filesize

          490B

          MD5

          62126b74368d64907088d3c59c553ecd

          SHA1

          7ea3fc1026e7895346dd2990a0bcaf01c1288a14

          SHA256

          cf3f1b69bbdc009a07d8cc8ee67c1d39dcd290e3c94f0374bef06136144ce9ae

          SHA512

          1dc2be5861124b209009563d82da57deb101134bab096d03ccc96110eca8b50d1d29ed01b4704ee2056ea6ea118505d9e8f0fadabbbd72dc3dfab46886f08970

        • C:\Users\Admin\AppData\Local\Temp\8779be4c-4877-451e-a356-2867dba7e75a.vbs

          Filesize

          714B

          MD5

          800eb65e6b423837c8daac9179563732

          SHA1

          9cf0f92001a1d67d6906bcb9560605b4ac53db4e

          SHA256

          6c17f5b0396264945baf0e12102c04081635ff0ec7afa84991ece7a2e96120a2

          SHA512

          67761ea0957f1f518e91881895e259f2efe8026345f652cc93e93036da9706d76ae8d1788801900e9cdbdf5107edf2029afe68a0242c539678e540bf0d29303c

        • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Recent\CustomDestinations\590aee7bdd69b59b.customDestinations-ms

          Filesize

          7KB

          MD5

          7b1040cf108c247dfc90dd966bb7c0b7

          SHA1

          d488d99f2b8cc0349f8ec6b64cd37a320fbbb054

          SHA256

          c44e58bf9c3af6f9d761a89a91356caecd0d1f2ff892d7006445bd30802e02c2

          SHA512

          e547984f63619c0c40623f33a04361cee900ffa762a1a608cbd3f58880c4f3c1f4aaa2fb2a73b2b631a60ab50ae9461850f161b658c6562a6ae69f34eab471ab

        • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Recent\CustomDestinations\590aee7bdd69b59b.customDestinations-ms

          Filesize

          7KB

          MD5

          7b1040cf108c247dfc90dd966bb7c0b7

          SHA1

          d488d99f2b8cc0349f8ec6b64cd37a320fbbb054

          SHA256

          c44e58bf9c3af6f9d761a89a91356caecd0d1f2ff892d7006445bd30802e02c2

          SHA512

          e547984f63619c0c40623f33a04361cee900ffa762a1a608cbd3f58880c4f3c1f4aaa2fb2a73b2b631a60ab50ae9461850f161b658c6562a6ae69f34eab471ab

        • C:\Users\All Users\Favorites\lsass.exe

          Filesize

          3.8MB

          MD5

          71436e482e0d0bd7648ee96cb6936613

          SHA1

          71b954f5971ef7e1549a2abd7391ec841f092ac4

          SHA256

          ed9806b6ca433fa7207636e5eb27bfacf475514765712ce37b41dff6890187e9

          SHA512

          5889958d772e10f42ae6667f01b2c9a5b29e6918f21d4bdce1bd7f2a256c0cf9ddc4aed430d30f7df0c9fab1713f0d981bd74220306e0769936fcb86ab537e1b

        • C:\Users\Public\Favorites\lsass.exe

          Filesize

          3.8MB

          MD5

          71436e482e0d0bd7648ee96cb6936613

          SHA1

          71b954f5971ef7e1549a2abd7391ec841f092ac4

          SHA256

          ed9806b6ca433fa7207636e5eb27bfacf475514765712ce37b41dff6890187e9

          SHA512

          5889958d772e10f42ae6667f01b2c9a5b29e6918f21d4bdce1bd7f2a256c0cf9ddc4aed430d30f7df0c9fab1713f0d981bd74220306e0769936fcb86ab537e1b

        • memory/788-76-0x0000000000000000-mapping.dmp

        • memory/904-98-0x000007FEEDDA0000-0x000007FEEE8FD000-memory.dmp

          Filesize

          11.4MB

        • memory/904-78-0x0000000000000000-mapping.dmp

        • memory/904-106-0x000000000289B000-0x00000000028BA000-memory.dmp

          Filesize

          124KB

        • memory/904-104-0x0000000002894000-0x0000000002897000-memory.dmp

          Filesize

          12KB

        • memory/904-102-0x000000001B770000-0x000000001BA6F000-memory.dmp

          Filesize

          3.0MB

        • memory/904-97-0x0000000002894000-0x0000000002897000-memory.dmp

          Filesize

          12KB

        • memory/904-86-0x000007FEEB840000-0x000007FEEC263000-memory.dmp

          Filesize

          10.1MB

        • memory/1016-57-0x0000000000870000-0x0000000000880000-memory.dmp

          Filesize

          64KB

        • memory/1016-59-0x00000000009B0000-0x00000000009BA000-memory.dmp

          Filesize

          40KB

        • memory/1016-70-0x0000000002440000-0x000000000244E000-memory.dmp

          Filesize

          56KB

        • memory/1016-71-0x0000000002450000-0x0000000002458000-memory.dmp

          Filesize

          32KB

        • memory/1016-72-0x0000000002460000-0x000000000246C000-memory.dmp

          Filesize

          48KB

        • memory/1016-73-0x0000000002480000-0x000000000248A000-memory.dmp

          Filesize

          40KB

        • memory/1016-74-0x0000000002490000-0x000000000249C000-memory.dmp

          Filesize

          48KB

        • memory/1016-55-0x0000000000840000-0x000000000085C000-memory.dmp

          Filesize

          112KB

        • memory/1016-61-0x0000000000A10000-0x0000000000A1C000-memory.dmp

          Filesize

          48KB

        • memory/1016-56-0x0000000000860000-0x0000000000868000-memory.dmp

          Filesize

          32KB

        • memory/1016-68-0x0000000002250000-0x000000000225E000-memory.dmp

          Filesize

          56KB

        • memory/1016-69-0x0000000002430000-0x0000000002438000-memory.dmp

          Filesize

          32KB

        • memory/1016-60-0x00000000009C0000-0x0000000000A16000-memory.dmp

          Filesize

          344KB

        • memory/1016-54-0x0000000000050000-0x000000000041A000-memory.dmp

          Filesize

          3.8MB

        • memory/1016-66-0x0000000002230000-0x0000000002238000-memory.dmp

          Filesize

          32KB

        • memory/1016-58-0x0000000000990000-0x00000000009A6000-memory.dmp

          Filesize

          88KB

        • memory/1016-62-0x0000000000C30000-0x0000000000C42000-memory.dmp

          Filesize

          72KB

        • memory/1016-65-0x0000000002220000-0x0000000002228000-memory.dmp

          Filesize

          32KB

        • memory/1016-67-0x0000000002240000-0x000000000224A000-memory.dmp

          Filesize

          40KB

        • memory/1016-63-0x0000000000C60000-0x0000000000C68000-memory.dmp

          Filesize

          32KB

        • memory/1016-64-0x0000000000C70000-0x0000000000C7C000-memory.dmp

          Filesize

          48KB

        • memory/1104-109-0x0000000000000000-mapping.dmp

        • memory/1452-95-0x00000000005F0000-0x0000000000646000-memory.dmp

          Filesize

          344KB

        • memory/1452-90-0x0000000000E20000-0x00000000011EA000-memory.dmp

          Filesize

          3.8MB

        • memory/1452-87-0x0000000000000000-mapping.dmp

        • memory/1608-77-0x0000000000000000-mapping.dmp

        • memory/1608-107-0x000000000235B000-0x000000000237A000-memory.dmp

          Filesize

          124KB

        • memory/1608-91-0x000007FEEB840000-0x000007FEEC263000-memory.dmp

          Filesize

          10.1MB

        • memory/1608-93-0x000007FEEDDA0000-0x000007FEEE8FD000-memory.dmp

          Filesize

          11.4MB

        • memory/1608-103-0x0000000002354000-0x0000000002357000-memory.dmp

          Filesize

          12KB

        • memory/1608-99-0x000000001B700000-0x000000001B9FF000-memory.dmp

          Filesize

          3.0MB

        • memory/1608-105-0x0000000002354000-0x0000000002357000-memory.dmp

          Filesize

          12KB

        • memory/1608-92-0x0000000002354000-0x0000000002357000-memory.dmp

          Filesize

          12KB

        • memory/1700-108-0x0000000000000000-mapping.dmp

        • memory/2000-101-0x000000000249B000-0x00000000024BA000-memory.dmp

          Filesize

          124KB

        • memory/2000-84-0x000007FEEB840000-0x000007FEEC263000-memory.dmp

          Filesize

          10.1MB

        • memory/2000-96-0x0000000002494000-0x0000000002497000-memory.dmp

          Filesize

          12KB

        • memory/2000-100-0x0000000002494000-0x0000000002497000-memory.dmp

          Filesize

          12KB

        • memory/2000-94-0x000007FEEDDA0000-0x000007FEEE8FD000-memory.dmp

          Filesize

          11.4MB

        • memory/2000-79-0x000007FEFC2C1000-0x000007FEFC2C3000-memory.dmp

          Filesize

          8KB

        • memory/2000-75-0x0000000000000000-mapping.dmp