Analysis

  • max time kernel
    163s
  • max time network
    180s
  • platform
    windows7_x64
  • resource
    win7-20240221-en
  • resource tags

    arch:x64arch:x86image:win7-20240221-enlocale:en-usos:windows7-x64system
  • submitted
    17-04-2024 13:34

General

  • Target

    c5fe1e625c87aa811d76f20079f286f5b9f3b5c971d5ba86350c37327c509981.exe

  • Size

    233KB

  • MD5

    9f72ad79bba9d398a150be4b676c624b

  • SHA1

    f06218c9fb624ba6a8040846c1a888e6dacc6fb6

  • SHA256

    c5fe1e625c87aa811d76f20079f286f5b9f3b5c971d5ba86350c37327c509981

  • SHA512

    bd7a919b1773115756c1b795fc3111132f7acd8290e2d82c25e6b6d03510bc61f7736c3b1fee2794bd3492e103121018d83565d2dea79287481b99f31bdbb393

  • SSDEEP

    3072:1oCTZcw8fGJiR21K9Np5Y4xL1JTp0C2bhUQiGkRo8DegwT:1ob/vFF2bhd8l

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\c5fe1e625c87aa811d76f20079f286f5b9f3b5c971d5ba86350c37327c509981.exe
    "C:\Users\Admin\AppData\Local\Temp\c5fe1e625c87aa811d76f20079f286f5b9f3b5c971d5ba86350c37327c509981.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:3028
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\pmojrndh\
      2⤵
        PID:2580
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\pbresrjn.exe" C:\Windows\SysWOW64\pmojrndh\
        2⤵
          PID:2776
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create pmojrndh binPath= "C:\Windows\SysWOW64\pmojrndh\pbresrjn.exe /d\"C:\Users\Admin\AppData\Local\Temp\c5fe1e625c87aa811d76f20079f286f5b9f3b5c971d5ba86350c37327c509981.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:1980
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description pmojrndh "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:2412
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start pmojrndh
          2⤵
          • Launches sc.exe
          PID:2560
        • 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:2856
      • C:\Windows\SysWOW64\pmojrndh\pbresrjn.exe
        C:\Windows\SysWOW64\pmojrndh\pbresrjn.exe /d"C:\Users\Admin\AppData\Local\Temp\c5fe1e625c87aa811d76f20079f286f5b9f3b5c971d5ba86350c37327c509981.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:2464
        • 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:1380

      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\pbresrjn.exe
        Filesize

        10.1MB

        MD5

        9f10572a5fd1819e16a44c2d6138ad61

        SHA1

        fdbb6ee3b52c70c4ab2a5bddacda4ee394df947e

        SHA256

        3e79ebd6444fb8b99751336a5316ec01b1699ccef432586333ccce3494e49e92

        SHA512

        a1c05d568827ace466c2c4de8d8b8229586c3c6c7a949ba64f1286abc2ffad2cdf87ca5c9ce68421cf090fdee83b6ec965eef36ccf141f384989a0febc6fd8fc

      • memory/1380-45-0x0000000000120000-0x0000000000130000-memory.dmp
        Filesize

        64KB

      • memory/1380-49-0x0000000000130000-0x0000000000135000-memory.dmp
        Filesize

        20KB

      • memory/1380-61-0x0000000000080000-0x0000000000095000-memory.dmp
        Filesize

        84KB

      • memory/1380-34-0x0000000000120000-0x0000000000130000-memory.dmp
        Filesize

        64KB

      • memory/1380-56-0x0000000005510000-0x000000000591B000-memory.dmp
        Filesize

        4.0MB

      • memory/1380-53-0x0000000005510000-0x000000000591B000-memory.dmp
        Filesize

        4.0MB

      • memory/1380-11-0x0000000000080000-0x0000000000095000-memory.dmp
        Filesize

        84KB

      • memory/1380-12-0x000000007EFDE000-0x000000007EFDF000-memory.dmp
        Filesize

        4KB

      • memory/1380-14-0x0000000000080000-0x0000000000095000-memory.dmp
        Filesize

        84KB

      • memory/1380-52-0x0000000000130000-0x0000000000135000-memory.dmp
        Filesize

        20KB

      • memory/1380-19-0x0000000000080000-0x0000000000095000-memory.dmp
        Filesize

        84KB

      • memory/1380-20-0x0000000000080000-0x0000000000095000-memory.dmp
        Filesize

        84KB

      • memory/1380-22-0x0000000001900000-0x0000000001B0F000-memory.dmp
        Filesize

        2.1MB

      • memory/1380-35-0x0000000000120000-0x0000000000130000-memory.dmp
        Filesize

        64KB

      • memory/1380-25-0x0000000001900000-0x0000000001B0F000-memory.dmp
        Filesize

        2.1MB

      • memory/1380-29-0x0000000000120000-0x0000000000130000-memory.dmp
        Filesize

        64KB

      • memory/1380-32-0x0000000000120000-0x0000000000130000-memory.dmp
        Filesize

        64KB

      • memory/1380-33-0x0000000000120000-0x0000000000130000-memory.dmp
        Filesize

        64KB

      • memory/1380-57-0x0000000000180000-0x0000000000187000-memory.dmp
        Filesize

        28KB

      • memory/1380-36-0x0000000000120000-0x0000000000130000-memory.dmp
        Filesize

        64KB

      • memory/1380-26-0x0000000000110000-0x0000000000116000-memory.dmp
        Filesize

        24KB

      • memory/1380-37-0x0000000000120000-0x0000000000130000-memory.dmp
        Filesize

        64KB

      • memory/1380-38-0x0000000000120000-0x0000000000130000-memory.dmp
        Filesize

        64KB

      • memory/1380-39-0x0000000000120000-0x0000000000130000-memory.dmp
        Filesize

        64KB

      • memory/1380-40-0x0000000000120000-0x0000000000130000-memory.dmp
        Filesize

        64KB

      • memory/1380-41-0x0000000000120000-0x0000000000130000-memory.dmp
        Filesize

        64KB

      • memory/1380-42-0x0000000000120000-0x0000000000130000-memory.dmp
        Filesize

        64KB

      • memory/1380-43-0x0000000000120000-0x0000000000130000-memory.dmp
        Filesize

        64KB

      • memory/1380-44-0x0000000000120000-0x0000000000130000-memory.dmp
        Filesize

        64KB

      • memory/1380-48-0x0000000000120000-0x0000000000130000-memory.dmp
        Filesize

        64KB

      • memory/1380-46-0x0000000000120000-0x0000000000130000-memory.dmp
        Filesize

        64KB

      • memory/1380-47-0x0000000000120000-0x0000000000130000-memory.dmp
        Filesize

        64KB

      • memory/2464-16-0x0000000000400000-0x000000000043F000-memory.dmp
        Filesize

        252KB

      • memory/2464-10-0x0000000000400000-0x000000000043F000-memory.dmp
        Filesize

        252KB

      • memory/2464-9-0x0000000000250000-0x0000000000350000-memory.dmp
        Filesize

        1024KB

      • memory/3028-1-0x00000000008A0000-0x00000000009A0000-memory.dmp
        Filesize

        1024KB

      • memory/3028-4-0x0000000000400000-0x000000000043F000-memory.dmp
        Filesize

        252KB

      • memory/3028-7-0x0000000000400000-0x000000000043F000-memory.dmp
        Filesize

        252KB

      • memory/3028-2-0x0000000000230000-0x0000000000243000-memory.dmp
        Filesize

        76KB