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Analysis

  • max time kernel
    150s
  • max time network
    156s
  • platform
    windows7_x64
  • resource
    win7-20220812-en
  • resource tags

    arch:x64arch:x86image:win7-20220812-enlocale:en-usos:windows7-x64system
  • submitted
    01/12/2022, 20:27

General

  • Target

    file.exe

  • Size

    192KB

  • MD5

    911647ce6826d410a80da55024518d9f

  • SHA1

    a49ce6f4e31271bbe9a143fbb9070e1762af26dd

  • SHA256

    7a5d072a81edb0fa296dd1e1329915d00b1fd891ccbacac75f382b753951e888

  • SHA512

    60aa1d051c3b09c57bf925566f78b848be8ec2d5aa18d2f251ed0a53a929d33af26a384021c8b5251c21a645a1c2b9f3cd44facfa45062d7975a7729ef40eef3

  • SSDEEP

    3072:4NbwXahIq1sQXuGIJ5b+vOWU/zRpoPY6oGd7CDwpjRs9E3AZxpR/rNY:4/1sQXuGODWyRpoPYoeDpvpZN

Malware Config

Extracted

Family

tofsee

C2

svartalfheim.top

jotunheim.name

Signatures

  • Tofsee

    Backdoor/botnet which carries out malicious activities based on commands from a C2 server.

  • Windows security bypass 2 TTPs 1 IoCs
  • xmrig

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

  • XMRig Miner payload 2 IoCs
  • Creates new service(s) 1 TTPs
  • Executes dropped EXE 1 IoCs
  • Modifies Windows Firewall 1 TTPs 1 IoCs
  • Sets service image path in registry 2 TTPs 1 IoCs
  • Deletes itself 1 IoCs
  • Drops file in System32 directory 2 IoCs
  • Suspicious use of SetThreadContext 2 IoCs
  • Launches sc.exe 3 IoCs

    Sc.exe is a Windows utlilty to control services on the system.

  • Enumerates physical storage devices 1 TTPs

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

  • Modifies data under HKEY_USERS 7 IoCs
  • Suspicious use of AdjustPrivilegeToken 1 IoCs
  • Suspicious use of WriteProcessMemory 36 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\file.exe
    "C:\Users\Admin\AppData\Local\Temp\file.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:1488
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\rxvclpz\
      2⤵
        PID:1676
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\xntafrvk.exe" C:\Windows\SysWOW64\rxvclpz\
        2⤵
          PID:1524
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create rxvclpz binPath= "C:\Windows\SysWOW64\rxvclpz\xntafrvk.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:1780
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description rxvclpz "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:944
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start rxvclpz
          2⤵
          • Launches sc.exe
          PID:1796
        • C:\Windows\SysWOW64\netsh.exe
          "C:\Windows\System32\netsh.exe" advfirewall firewall add rule name="Host-process for services of Windows" dir=in action=allow program="C:\Windows\SysWOW64\svchost.exe" enable=yes>nul
          2⤵
          • Modifies Windows Firewall
          PID:516
      • C:\Windows\SysWOW64\rxvclpz\xntafrvk.exe
        C:\Windows\SysWOW64\rxvclpz\xntafrvk.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:572
        • C:\Windows\SysWOW64\svchost.exe
          svchost.exe
          2⤵
          • Windows security bypass
          • Sets service image path in registry
          • Deletes itself
          • Drops file in System32 directory
          • Suspicious use of SetThreadContext
          • Modifies data under HKEY_USERS
          • Suspicious use of WriteProcessMemory
          PID:1492
          • C:\Windows\SysWOW64\svchost.exe
            svchost.exe -o fastpool.xyz:10060 -u 9mLwUkiK8Yp89zQQYodWKN29jVVVz1cWDFZctWxge16Zi3TpHnSBnnVcCDhSRXdesnMBdVjtDwh1N71KD9z37EzgKSM1tmS.60000 -p x -k -a cn/half
            3⤵
            • Suspicious use of AdjustPrivilegeToken
            PID:1612

      Network

      MITRE ATT&CK Enterprise v6

      Replay Monitor

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      Downloads

      • C:\Users\Admin\AppData\Local\Temp\xntafrvk.exe

        Filesize

        14.4MB

        MD5

        c93f052623df31b1adc55468f337403b

        SHA1

        10809378d3836e2010217b826ac0d0427f26abc5

        SHA256

        a855581b3a9a5189c38a87786a1b7d39551d2d048643a9913789655ef1f12b09

        SHA512

        47088cddb9d0580170704d5bc8171d98dc9c249c5457a6829900edb74df3d2438f533b782ef65109e218a99759ec4b6376a94214cbab3e1a4249ebc000c32a14

      • C:\Windows\SysWOW64\rxvclpz\xntafrvk.exe

        Filesize

        14.4MB

        MD5

        c93f052623df31b1adc55468f337403b

        SHA1

        10809378d3836e2010217b826ac0d0427f26abc5

        SHA256

        a855581b3a9a5189c38a87786a1b7d39551d2d048643a9913789655ef1f12b09

        SHA512

        47088cddb9d0580170704d5bc8171d98dc9c249c5457a6829900edb74df3d2438f533b782ef65109e218a99759ec4b6376a94214cbab3e1a4249ebc000c32a14

      • memory/572-74-0x000000000062B000-0x000000000063C000-memory.dmp

        Filesize

        68KB

      • memory/572-76-0x0000000000400000-0x0000000000466000-memory.dmp

        Filesize

        408KB

      • memory/1488-57-0x0000000000400000-0x0000000000466000-memory.dmp

        Filesize

        408KB

      • memory/1488-54-0x000000000065B000-0x000000000066C000-memory.dmp

        Filesize

        68KB

      • memory/1488-67-0x0000000000220000-0x0000000000233000-memory.dmp

        Filesize

        76KB

      • memory/1488-68-0x0000000000400000-0x0000000000466000-memory.dmp

        Filesize

        408KB

      • memory/1488-56-0x0000000076681000-0x0000000076683000-memory.dmp

        Filesize

        8KB

      • memory/1488-55-0x0000000000220000-0x0000000000233000-memory.dmp

        Filesize

        76KB

      • memory/1488-66-0x000000000065B000-0x000000000066C000-memory.dmp

        Filesize

        68KB

      • memory/1492-81-0x00000000019E0000-0x0000000001BEF000-memory.dmp

        Filesize

        2.1MB

      • memory/1492-96-0x00000000001B0000-0x00000000001B7000-memory.dmp

        Filesize

        28KB

      • memory/1492-70-0x0000000000080000-0x0000000000095000-memory.dmp

        Filesize

        84KB

      • memory/1492-72-0x0000000000080000-0x0000000000095000-memory.dmp

        Filesize

        84KB

      • memory/1492-99-0x0000000000080000-0x0000000000095000-memory.dmp

        Filesize

        84KB

      • memory/1492-93-0x0000000005920000-0x0000000005D2B000-memory.dmp

        Filesize

        4.0MB

      • memory/1492-79-0x0000000000080000-0x0000000000095000-memory.dmp

        Filesize

        84KB

      • memory/1492-90-0x00000000001A0000-0x00000000001A5000-memory.dmp

        Filesize

        20KB

      • memory/1492-84-0x0000000000110000-0x0000000000116000-memory.dmp

        Filesize

        24KB

      • memory/1492-87-0x0000000000120000-0x0000000000130000-memory.dmp

        Filesize

        64KB

      • memory/1612-100-0x0000000000230000-0x0000000000321000-memory.dmp

        Filesize

        964KB

      • memory/1612-102-0x0000000000230000-0x0000000000321000-memory.dmp

        Filesize

        964KB