Analysis

  • max time kernel
    150s
  • max time network
    153s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220721-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20220721-enlocale:en-usos:windows10-2004-x64system
  • submitted
    10-08-2022 12:47

General

  • Target

    ebe01122cf936ff383e04138cab3562215ee5e5100a81ec723c00daae516c595.exe

  • Size

    341KB

  • MD5

    c41aa85d34870d42ca04ae19732c6498

  • SHA1

    26b7c8516373a74ee8d0d8259f512b15a5c662d0

  • SHA256

    ebe01122cf936ff383e04138cab3562215ee5e5100a81ec723c00daae516c595

  • SHA512

    9b213d70e871ffb0b893666425467e49b44c61cfeb4f868911e7c79d59a4353082bbcdab709c201a199092eefca81c248f6ca7819a96f205e51f95e372fd4d6f

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

Processes

  • C:\Users\Admin\AppData\Local\Temp\ebe01122cf936ff383e04138cab3562215ee5e5100a81ec723c00daae516c595.exe
    "C:\Users\Admin\AppData\Local\Temp\ebe01122cf936ff383e04138cab3562215ee5e5100a81ec723c00daae516c595.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:2648
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\ihroyyjh\
      2⤵
        PID:4080
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\fueivwl.exe" C:\Windows\SysWOW64\ihroyyjh\
        2⤵
          PID:4948
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create ihroyyjh binPath= "C:\Windows\SysWOW64\ihroyyjh\fueivwl.exe /d\"C:\Users\Admin\AppData\Local\Temp\ebe01122cf936ff383e04138cab3562215ee5e5100a81ec723c00daae516c595.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:4924
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description ihroyyjh "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:224
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start ihroyyjh
          2⤵
          • Launches sc.exe
          PID:444
        • 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:1288
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 2648 -s 1036
          2⤵
          • Program crash
          PID:2972
      • C:\Windows\SysWOW64\ihroyyjh\fueivwl.exe
        C:\Windows\SysWOW64\ihroyyjh\fueivwl.exe /d"C:\Users\Admin\AppData\Local\Temp\ebe01122cf936ff383e04138cab3562215ee5e5100a81ec723c00daae516c595.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:3776
        • 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:4208
          • 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:4708
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3776 -s 508
          2⤵
          • Program crash
          PID:4120
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 460 -p 2648 -ip 2648
        1⤵
          PID:1496
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 464 -p 3776 -ip 3776
          1⤵
            PID:4116

          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\fueivwl.exe
            Filesize

            14.4MB

            MD5

            7b4c0a6b9f254fc96d025bf31fc01693

            SHA1

            3896abae2cd8242bd4d7440916b7693c82ed4b28

            SHA256

            c3579e0ab3fdcf7ec62e251bf40ac0125f3d6a77bc622845d5c4592526344039

            SHA512

            7ff29cf6714e65b4eeaee7d8aee35ec3794932d0e5828d8d8dcb4cb26dd32bcdb72a328d86c32dcf23630f703b9f6b6e10e6d89ae2e037dbc5fc73dadf862935

          • C:\Windows\SysWOW64\ihroyyjh\fueivwl.exe
            Filesize

            14.4MB

            MD5

            7b4c0a6b9f254fc96d025bf31fc01693

            SHA1

            3896abae2cd8242bd4d7440916b7693c82ed4b28

            SHA256

            c3579e0ab3fdcf7ec62e251bf40ac0125f3d6a77bc622845d5c4592526344039

            SHA512

            7ff29cf6714e65b4eeaee7d8aee35ec3794932d0e5828d8d8dcb4cb26dd32bcdb72a328d86c32dcf23630f703b9f6b6e10e6d89ae2e037dbc5fc73dadf862935

          • memory/224-137-0x0000000000000000-mapping.dmp
          • memory/444-138-0x0000000000000000-mapping.dmp
          • memory/1288-140-0x0000000000000000-mapping.dmp
          • memory/2648-131-0x00000000006DE000-0x00000000006EF000-memory.dmp
            Filesize

            68KB

          • memory/2648-132-0x0000000000610000-0x0000000000623000-memory.dmp
            Filesize

            76KB

          • memory/2648-133-0x0000000000400000-0x000000000046D000-memory.dmp
            Filesize

            436KB

          • memory/2648-141-0x0000000000400000-0x000000000046D000-memory.dmp
            Filesize

            436KB

          • memory/3776-146-0x0000000000629000-0x0000000000639000-memory.dmp
            Filesize

            64KB

          • memory/3776-147-0x0000000000400000-0x000000000046D000-memory.dmp
            Filesize

            436KB

          • memory/4080-130-0x0000000000000000-mapping.dmp
          • memory/4208-150-0x0000000002400000-0x000000000260F000-memory.dmp
            Filesize

            2.1MB

          • memory/4208-153-0x00000000007E0000-0x00000000007E6000-memory.dmp
            Filesize

            24KB

          • memory/4208-142-0x0000000000000000-mapping.dmp
          • memory/4208-165-0x00000000027E0000-0x00000000027E7000-memory.dmp
            Filesize

            28KB

          • memory/4208-148-0x0000000000480000-0x0000000000495000-memory.dmp
            Filesize

            84KB

          • memory/4208-149-0x0000000000480000-0x0000000000495000-memory.dmp
            Filesize

            84KB

          • memory/4208-162-0x0000000007440000-0x000000000784B000-memory.dmp
            Filesize

            4.0MB

          • memory/4208-143-0x0000000000480000-0x0000000000495000-memory.dmp
            Filesize

            84KB

          • memory/4208-156-0x00000000007F0000-0x0000000000800000-memory.dmp
            Filesize

            64KB

          • memory/4208-159-0x00000000017E0000-0x00000000017E5000-memory.dmp
            Filesize

            20KB

          • memory/4708-168-0x0000000000000000-mapping.dmp
          • memory/4708-169-0x0000000001220000-0x0000000001311000-memory.dmp
            Filesize

            964KB

          • memory/4708-174-0x0000000001220000-0x0000000001311000-memory.dmp
            Filesize

            964KB

          • memory/4924-136-0x0000000000000000-mapping.dmp
          • memory/4948-134-0x0000000000000000-mapping.dmp