Analysis

  • max time kernel
    148s
  • 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
    12-05-2023 15:07

General

  • Target

    file.exe

  • Size

    322KB

  • MD5

    c5b9c27223bd12c6e6a0c46e5b411e27

  • SHA1

    68a98a64db6df5bd1feb25288220d186da8fd718

  • SHA256

    8cc3efde2ca85f0d6fcb6c96beb65869fdf024b3f948c1de79194e7988446a48

  • SHA512

    a3d3cdb3b4b1ba88000fc458a4def99973d4a0794b9e85bd0f156643c925f3baaebe9f3a900f8b260568af484671c6c0d541e7403a6d7075a1783088ba630299

  • SSDEEP

    3072:1KPtaVfzJ+xzpxIUgpnvKxvGbqqV7gPCs5lQYFwGfABn/9vOsJp7t:QetWkUIy4bVyCs5ZQ/OI

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:1804
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\tpdmrvum\
      2⤵
        PID:1964
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\keewzjnz.exe" C:\Windows\SysWOW64\tpdmrvum\
        2⤵
          PID:1780
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create tpdmrvum binPath= "C:\Windows\SysWOW64\tpdmrvum\keewzjnz.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:2748
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description tpdmrvum "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:1140
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start tpdmrvum
          2⤵
          • Launches sc.exe
          PID:5016
        • 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:4812
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 1804 -s 1200
          2⤵
          • Program crash
          PID:4364
      • C:\Windows\SysWOW64\tpdmrvum\keewzjnz.exe
        C:\Windows\SysWOW64\tpdmrvum\keewzjnz.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:3380
        • 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:4220
          • 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:380
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3380 -s 508
          2⤵
          • Program crash
          PID:928
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 456 -p 1804 -ip 1804
        1⤵
          PID:3952
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 468 -p 3380 -ip 3380
          1⤵
            PID:4456

          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\keewzjnz.exe
            Filesize

            11.6MB

            MD5

            4b98ed4ce17192a58607c157297cd9b0

            SHA1

            d57672ad2f9716acacf4943853faf86b8e5bbc45

            SHA256

            5f422d7e6ae9116331bcd453a012c776af706d52acc6ef045857895489eef85d

            SHA512

            f47a3a7660ed5c291ffdf0ff1b5fda0462f839eab6fa41fb948b4c19ffeed178b502708b5b1d8126318276c1ca9ba612e8712e20ec4e8c3fcac6286966cacc43

          • C:\Windows\SysWOW64\tpdmrvum\keewzjnz.exe
            Filesize

            11.6MB

            MD5

            4b98ed4ce17192a58607c157297cd9b0

            SHA1

            d57672ad2f9716acacf4943853faf86b8e5bbc45

            SHA256

            5f422d7e6ae9116331bcd453a012c776af706d52acc6ef045857895489eef85d

            SHA512

            f47a3a7660ed5c291ffdf0ff1b5fda0462f839eab6fa41fb948b4c19ffeed178b502708b5b1d8126318276c1ca9ba612e8712e20ec4e8c3fcac6286966cacc43

          • memory/380-194-0x0000000001290000-0x0000000001381000-memory.dmp
            Filesize

            964KB

          • memory/380-188-0x0000000001290000-0x0000000001381000-memory.dmp
            Filesize

            964KB

          • memory/380-199-0x0000000001290000-0x0000000001381000-memory.dmp
            Filesize

            964KB

          • memory/380-198-0x0000000001290000-0x0000000001381000-memory.dmp
            Filesize

            964KB

          • memory/380-193-0x0000000001290000-0x0000000001381000-memory.dmp
            Filesize

            964KB

          • memory/380-197-0x0000000001290000-0x0000000001381000-memory.dmp
            Filesize

            964KB

          • memory/380-196-0x0000000001290000-0x0000000001381000-memory.dmp
            Filesize

            964KB

          • memory/380-195-0x0000000001290000-0x0000000001381000-memory.dmp
            Filesize

            964KB

          • memory/1804-138-0x0000000000400000-0x00000000006CE000-memory.dmp
            Filesize

            2.8MB

          • memory/1804-135-0x00000000007E0000-0x00000000007F3000-memory.dmp
            Filesize

            76KB

          • memory/3380-144-0x0000000000400000-0x00000000006CE000-memory.dmp
            Filesize

            2.8MB

          • memory/4220-166-0x0000000002330000-0x0000000002340000-memory.dmp
            Filesize

            64KB

          • memory/4220-173-0x0000000002330000-0x0000000002340000-memory.dmp
            Filesize

            64KB

          • memory/4220-165-0x0000000002330000-0x0000000002340000-memory.dmp
            Filesize

            64KB

          • memory/4220-164-0x0000000002330000-0x0000000002340000-memory.dmp
            Filesize

            64KB

          • memory/4220-163-0x0000000002330000-0x0000000002340000-memory.dmp
            Filesize

            64KB

          • memory/4220-162-0x0000000002330000-0x0000000002340000-memory.dmp
            Filesize

            64KB

          • memory/4220-161-0x0000000002330000-0x0000000002340000-memory.dmp
            Filesize

            64KB

          • memory/4220-159-0x0000000002330000-0x0000000002340000-memory.dmp
            Filesize

            64KB

          • memory/4220-167-0x0000000002330000-0x0000000002340000-memory.dmp
            Filesize

            64KB

          • memory/4220-156-0x0000000002330000-0x0000000002340000-memory.dmp
            Filesize

            64KB

          • memory/4220-168-0x0000000002330000-0x0000000002340000-memory.dmp
            Filesize

            64KB

          • memory/4220-169-0x0000000002330000-0x0000000002340000-memory.dmp
            Filesize

            64KB

          • memory/4220-170-0x0000000002330000-0x0000000002340000-memory.dmp
            Filesize

            64KB

          • memory/4220-171-0x0000000002330000-0x0000000002340000-memory.dmp
            Filesize

            64KB

          • memory/4220-172-0x0000000002330000-0x0000000002340000-memory.dmp
            Filesize

            64KB

          • memory/4220-160-0x0000000002330000-0x0000000002340000-memory.dmp
            Filesize

            64KB

          • memory/4220-174-0x0000000002330000-0x0000000002340000-memory.dmp
            Filesize

            64KB

          • memory/4220-175-0x0000000002330000-0x0000000002340000-memory.dmp
            Filesize

            64KB

          • memory/4220-176-0x00000000031D0000-0x00000000031D5000-memory.dmp
            Filesize

            20KB

          • memory/4220-179-0x00000000031D0000-0x00000000031D5000-memory.dmp
            Filesize

            20KB

          • memory/4220-180-0x0000000007B40000-0x0000000007F4B000-memory.dmp
            Filesize

            4.0MB

          • memory/4220-183-0x0000000007B40000-0x0000000007F4B000-memory.dmp
            Filesize

            4.0MB

          • memory/4220-184-0x00000000031E0000-0x00000000031E7000-memory.dmp
            Filesize

            28KB

          • memory/4220-153-0x0000000002320000-0x0000000002326000-memory.dmp
            Filesize

            24KB

          • memory/4220-152-0x0000000002C00000-0x0000000002E0F000-memory.dmp
            Filesize

            2.1MB

          • memory/4220-149-0x0000000002C00000-0x0000000002E0F000-memory.dmp
            Filesize

            2.1MB

          • memory/4220-148-0x0000000000DB0000-0x0000000000DC5000-memory.dmp
            Filesize

            84KB

          • memory/4220-146-0x0000000000DB0000-0x0000000000DC5000-memory.dmp
            Filesize

            84KB

          • memory/4220-145-0x0000000000DB0000-0x0000000000DC5000-memory.dmp
            Filesize

            84KB

          • memory/4220-143-0x0000000000DB0000-0x0000000000DC5000-memory.dmp
            Filesize

            84KB

          • memory/4220-140-0x0000000000DB0000-0x0000000000DC5000-memory.dmp
            Filesize

            84KB