Analysis

  • max time kernel
    149s
  • max time network
    148s
  • platform
    windows7_x64
  • resource
    win7-20231129-en
  • resource tags

    arch:x64arch:x86image:win7-20231129-enlocale:en-usos:windows7-x64system
  • submitted
    21-05-2024 05:56

General

  • Target

    b7ab94357342f73380569c9b23bc81741e1784b8a7cfdfe8df680000a1f3da1f.exe

  • Size

    178KB

  • MD5

    a6c7dd82eace106350d20d93956360e6

  • SHA1

    19c5ea0607b527e4c2b08a39583db38f503933e0

  • SHA256

    b7ab94357342f73380569c9b23bc81741e1784b8a7cfdfe8df680000a1f3da1f

  • SHA512

    6e3d950e1a16103710985e9e0993f26ece5f7d67eadbd711941e826117d0d884624ddf166d3a70e25453518bb2f7d9a9c2dede25f6785dcb24d6031ba29c419e

  • SSDEEP

    1536:DAc76NGJEzLoCPMkXzxIGzA9aRmNjo/Phcnr6xMtxUtoIlESP5tA9bDQqpN+X:D7kXzxIGzA9aUo/PhcnVHUtoe5K9

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) 2 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 7 IoCs
  • Suspicious use of WriteProcessMemory 30 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\b7ab94357342f73380569c9b23bc81741e1784b8a7cfdfe8df680000a1f3da1f.exe
    "C:\Users\Admin\AppData\Local\Temp\b7ab94357342f73380569c9b23bc81741e1784b8a7cfdfe8df680000a1f3da1f.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:1620
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\xskybmnw\
      2⤵
        PID:2520
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\zgjedxxr.exe" C:\Windows\SysWOW64\xskybmnw\
        2⤵
          PID:2396
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create xskybmnw binPath= "C:\Windows\SysWOW64\xskybmnw\zgjedxxr.exe /d\"C:\Users\Admin\AppData\Local\Temp\b7ab94357342f73380569c9b23bc81741e1784b8a7cfdfe8df680000a1f3da1f.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:320
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description xskybmnw "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:2796
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start xskybmnw
          2⤵
          • Launches sc.exe
          PID:2588
        • 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:3016
      • C:\Windows\SysWOW64\xskybmnw\zgjedxxr.exe
        C:\Windows\SysWOW64\xskybmnw\zgjedxxr.exe /d"C:\Users\Admin\AppData\Local\Temp\b7ab94357342f73380569c9b23bc81741e1784b8a7cfdfe8df680000a1f3da1f.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:2648
        • 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:2564

      Network

      MITRE ATT&CK Matrix ATT&CK v13

      Execution

      System Services

      1
      T1569

      Service Execution

      1
      T1569.002

      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\zgjedxxr.exe
        Filesize

        14.5MB

        MD5

        68327f4dc8d126bd214b488b9e0896f4

        SHA1

        1b1df219bcab6e020cfda0caf4a572d05a67a904

        SHA256

        40eb16b1b419440ee211c5f13ac8e6391ea5ba57a3914ad9cee5571502f69cb2

        SHA512

        6618bd7776752db201631c23a4fc2d87830e44fec9942b9789b2f787dece7ac7a1699b27ce4274436c70dda9a3f3ae2b1ea1157f27f7efd4554e16dc8d37b0fe

      • memory/1620-15-0x0000000000400000-0x0000000000415000-memory.dmp
        Filesize

        84KB

      • memory/1620-3-0x0000000000400000-0x0000000000415000-memory.dmp
        Filesize

        84KB

      • memory/1620-2-0x0000000000220000-0x0000000000233000-memory.dmp
        Filesize

        76KB

      • memory/1620-1-0x0000000002520000-0x0000000002620000-memory.dmp
        Filesize

        1024KB

      • memory/1620-14-0x0000000000400000-0x0000000002349000-memory.dmp
        Filesize

        31.3MB

      • memory/2564-49-0x0000000000170000-0x0000000000175000-memory.dmp
        Filesize

        20KB

      • memory/2564-44-0x0000000000160000-0x0000000000170000-memory.dmp
        Filesize

        64KB

      • memory/2564-23-0x00000000000A0000-0x00000000000A6000-memory.dmp
        Filesize

        24KB

      • memory/2564-10-0x000000007EFDE000-0x000000007EFDF000-memory.dmp
        Filesize

        4KB

      • memory/2564-16-0x0000000000080000-0x0000000000095000-memory.dmp
        Filesize

        84KB

      • memory/2564-17-0x0000000000080000-0x0000000000095000-memory.dmp
        Filesize

        84KB

      • memory/2564-22-0x0000000001A40000-0x0000000001C4F000-memory.dmp
        Filesize

        2.1MB

      • memory/2564-19-0x0000000001A40000-0x0000000001C4F000-memory.dmp
        Filesize

        2.1MB

      • memory/2564-36-0x0000000000160000-0x0000000000170000-memory.dmp
        Filesize

        64KB

      • memory/2564-54-0x00000000001C0000-0x00000000001C7000-memory.dmp
        Filesize

        28KB

      • memory/2564-53-0x0000000005480000-0x000000000588B000-memory.dmp
        Filesize

        4.0MB

      • memory/2564-50-0x0000000005480000-0x000000000588B000-memory.dmp
        Filesize

        4.0MB

      • memory/2564-11-0x0000000000080000-0x0000000000095000-memory.dmp
        Filesize

        84KB

      • memory/2564-46-0x0000000000170000-0x0000000000175000-memory.dmp
        Filesize

        20KB

      • memory/2564-45-0x0000000000160000-0x0000000000170000-memory.dmp
        Filesize

        64KB

      • memory/2564-8-0x0000000000080000-0x0000000000095000-memory.dmp
        Filesize

        84KB

      • memory/2564-43-0x0000000000160000-0x0000000000170000-memory.dmp
        Filesize

        64KB

      • memory/2564-42-0x0000000000160000-0x0000000000170000-memory.dmp
        Filesize

        64KB

      • memory/2564-41-0x0000000000160000-0x0000000000170000-memory.dmp
        Filesize

        64KB

      • memory/2564-40-0x0000000000160000-0x0000000000170000-memory.dmp
        Filesize

        64KB

      • memory/2564-39-0x0000000000160000-0x0000000000170000-memory.dmp
        Filesize

        64KB

      • memory/2564-38-0x0000000000160000-0x0000000000170000-memory.dmp
        Filesize

        64KB

      • memory/2564-37-0x0000000000160000-0x0000000000170000-memory.dmp
        Filesize

        64KB

      • memory/2564-35-0x0000000000160000-0x0000000000170000-memory.dmp
        Filesize

        64KB

      • memory/2564-34-0x0000000000160000-0x0000000000170000-memory.dmp
        Filesize

        64KB

      • memory/2564-33-0x0000000000160000-0x0000000000170000-memory.dmp
        Filesize

        64KB

      • memory/2564-32-0x0000000000160000-0x0000000000170000-memory.dmp
        Filesize

        64KB

      • memory/2564-31-0x0000000000160000-0x0000000000170000-memory.dmp
        Filesize

        64KB

      • memory/2564-30-0x0000000000160000-0x0000000000170000-memory.dmp
        Filesize

        64KB

      • memory/2564-29-0x0000000000160000-0x0000000000170000-memory.dmp
        Filesize

        64KB

      • memory/2564-26-0x0000000000160000-0x0000000000170000-memory.dmp
        Filesize

        64KB

      • memory/2648-13-0x0000000000400000-0x0000000002349000-memory.dmp
        Filesize

        31.3MB