Analysis

  • max time kernel
    146s
  • max time network
    156s
  • platform
    windows7_x64
  • resource
    win7-20240221-en
  • resource tags

    arch:x64arch:x86image:win7-20240221-enlocale:en-usos:windows7-x64system
  • submitted
    17-04-2024 13:28

General

  • Target

    b984128113ff555edf24f086dcec400c697413f9095c8510da1058a98a2cc4ad.exe

  • Size

    302KB

  • MD5

    9f9e5f55dc8cb3809e24b14fb8f9c27d

  • SHA1

    cfed2d1d3e44d8ad3d0cade2ca83f105949aa952

  • SHA256

    b984128113ff555edf24f086dcec400c697413f9095c8510da1058a98a2cc4ad

  • SHA512

    5e8acc5af13c952fd1f02f88d2acf5314bd98216d51f340f1e0163551c27c44267391bd82ef8d72a214ee3d28803f7c08ec2ca2a84f0c599bbe17e9d955d56b6

  • SSDEEP

    6144:VdUtDjcT/lUmHvYBLDTOGc/sh4m18vMm48IRi7:rq3w/6mHvYBSGosym1gMv8

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
  • Creates new service(s) 1 TTPs
  • Modifies Windows Firewall 2 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 1 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 6 IoCs
  • Suspicious use of WriteProcessMemory 30 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\b984128113ff555edf24f086dcec400c697413f9095c8510da1058a98a2cc4ad.exe
    "C:\Users\Admin\AppData\Local\Temp\b984128113ff555edf24f086dcec400c697413f9095c8510da1058a98a2cc4ad.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:612
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\fdihjmoc\
      2⤵
        PID:1384
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\brncxpnv.exe" C:\Windows\SysWOW64\fdihjmoc\
        2⤵
          PID:1720
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create fdihjmoc binPath= "C:\Windows\SysWOW64\fdihjmoc\brncxpnv.exe /d\"C:\Users\Admin\AppData\Local\Temp\b984128113ff555edf24f086dcec400c697413f9095c8510da1058a98a2cc4ad.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:2196
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description fdihjmoc "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:2992
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start fdihjmoc
          2⤵
          • Launches sc.exe
          PID:2612
        • 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:2708
      • C:\Windows\SysWOW64\fdihjmoc\brncxpnv.exe
        C:\Windows\SysWOW64\fdihjmoc\brncxpnv.exe /d"C:\Users\Admin\AppData\Local\Temp\b984128113ff555edf24f086dcec400c697413f9095c8510da1058a98a2cc4ad.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:2520
        • C:\Windows\SysWOW64\svchost.exe
          svchost.exe
          2⤵
          • Windows security bypass
          • Sets service image path in registry
          • Deletes itself
          • Drops file in System32 directory
          • Modifies data under HKEY_USERS
          PID:2556

      Network

      MITRE ATT&CK Matrix ATT&CK v13

      Persistence

      Create or Modify System Process

      2
      T1543

      Windows Service

      2
      T1543.003

      Boot or Logon Autostart Execution

      1
      T1547

      Registry Run Keys / Startup Folder

      1
      T1547.001

      Privilege Escalation

      Create or Modify System Process

      2
      T1543

      Windows Service

      2
      T1543.003

      Boot or Logon Autostart Execution

      1
      T1547

      Registry Run Keys / Startup Folder

      1
      T1547.001

      Defense Evasion

      Impair Defenses

      2
      T1562

      Disable or Modify Tools

      1
      T1562.001

      Disable or Modify System Firewall

      1
      T1562.004

      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

        14.1MB

        MD5

        aba1198cc7cce1cc3da3226858bdd4d1

        SHA1

        40adc7657a1c2848fce77d53698b59a2bc525547

        SHA256

        53f5f476b2c558dae817928941f9f8b3db3e7ce2f58de80ec3e58e4ab404c830

        SHA512

        b7b7342bdd301ad4ded00715d6f49379e3bd5aadc0097d187f3416d29e1501a899d81c3b023c7d25b3af5795cffb353381e97ce781c0e4c73aec530137b3ed2f

      • memory/612-2-0x00000000001B0000-0x00000000001C3000-memory.dmp
        Filesize

        76KB

      • memory/612-4-0x0000000000400000-0x00000000008FD000-memory.dmp
        Filesize

        5.0MB

      • memory/612-9-0x00000000001B0000-0x00000000001C3000-memory.dmp
        Filesize

        76KB

      • memory/612-7-0x0000000000400000-0x00000000008FD000-memory.dmp
        Filesize

        5.0MB

      • memory/612-1-0x0000000000270000-0x0000000000370000-memory.dmp
        Filesize

        1024KB

      • memory/2520-10-0x0000000000230000-0x0000000000330000-memory.dmp
        Filesize

        1024KB

      • memory/2520-13-0x0000000000400000-0x00000000008FD000-memory.dmp
        Filesize

        5.0MB

      • memory/2520-17-0x0000000000400000-0x00000000008FD000-memory.dmp
        Filesize

        5.0MB

      • memory/2556-34-0x0000000000130000-0x0000000000140000-memory.dmp
        Filesize

        64KB

      • memory/2556-38-0x0000000000130000-0x0000000000140000-memory.dmp
        Filesize

        64KB

      • memory/2556-12-0x000000007EFDE000-0x000000007EFDF000-memory.dmp
        Filesize

        4KB

      • memory/2556-19-0x0000000000080000-0x0000000000095000-memory.dmp
        Filesize

        84KB

      • memory/2556-20-0x0000000000080000-0x0000000000095000-memory.dmp
        Filesize

        84KB

      • memory/2556-22-0x0000000001900000-0x0000000001B0F000-memory.dmp
        Filesize

        2.1MB

      • memory/2556-25-0x0000000001900000-0x0000000001B0F000-memory.dmp
        Filesize

        2.1MB

      • memory/2556-26-0x00000000000E0000-0x00000000000E6000-memory.dmp
        Filesize

        24KB

      • memory/2556-29-0x0000000000130000-0x0000000000140000-memory.dmp
        Filesize

        64KB

      • memory/2556-32-0x0000000000130000-0x0000000000140000-memory.dmp
        Filesize

        64KB

      • memory/2556-33-0x0000000000130000-0x0000000000140000-memory.dmp
        Filesize

        64KB

      • memory/2556-11-0x0000000000080000-0x0000000000095000-memory.dmp
        Filesize

        84KB

      • memory/2556-35-0x0000000000130000-0x0000000000140000-memory.dmp
        Filesize

        64KB

      • memory/2556-36-0x0000000000130000-0x0000000000140000-memory.dmp
        Filesize

        64KB

      • memory/2556-37-0x0000000000130000-0x0000000000140000-memory.dmp
        Filesize

        64KB

      • memory/2556-15-0x0000000000080000-0x0000000000095000-memory.dmp
        Filesize

        84KB

      • memory/2556-39-0x0000000000130000-0x0000000000140000-memory.dmp
        Filesize

        64KB

      • memory/2556-41-0x0000000000130000-0x0000000000140000-memory.dmp
        Filesize

        64KB

      • memory/2556-40-0x0000000000130000-0x0000000000140000-memory.dmp
        Filesize

        64KB

      • memory/2556-42-0x0000000000130000-0x0000000000140000-memory.dmp
        Filesize

        64KB

      • memory/2556-43-0x0000000000130000-0x0000000000140000-memory.dmp
        Filesize

        64KB

      • memory/2556-44-0x0000000000130000-0x0000000000140000-memory.dmp
        Filesize

        64KB

      • memory/2556-45-0x0000000000130000-0x0000000000140000-memory.dmp
        Filesize

        64KB

      • memory/2556-46-0x0000000000130000-0x0000000000140000-memory.dmp
        Filesize

        64KB

      • memory/2556-47-0x0000000000130000-0x0000000000140000-memory.dmp
        Filesize

        64KB

      • memory/2556-48-0x0000000000130000-0x0000000000140000-memory.dmp
        Filesize

        64KB

      • memory/2556-49-0x00000000004D0000-0x00000000004D5000-memory.dmp
        Filesize

        20KB

      • memory/2556-52-0x00000000004D0000-0x00000000004D5000-memory.dmp
        Filesize

        20KB

      • memory/2556-53-0x00000000057C0000-0x0000000005BCB000-memory.dmp
        Filesize

        4.0MB

      • memory/2556-56-0x00000000057C0000-0x0000000005BCB000-memory.dmp
        Filesize

        4.0MB

      • memory/2556-57-0x00000000004E0000-0x00000000004E7000-memory.dmp
        Filesize

        28KB

      • memory/2556-61-0x0000000000080000-0x0000000000095000-memory.dmp
        Filesize

        84KB