Analysis

  • max time kernel
    149s
  • max time network
    152s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240412-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240412-enlocale:en-usos:windows10-2004-x64system
  • submitted
    17-04-2024 13:19

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.

  • Creates new service(s) 1 TTPs
  • Modifies Windows Firewall 2 TTPs 1 IoCs
  • Sets service image path in registry 2 TTPs 1 IoCs
  • Checks computer location settings 2 TTPs 1 IoCs

    Looks up country code configured in the registry, likely geofence.

  • 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).

  • Program crash 2 IoCs
  • Modifies data under HKEY_USERS 7 IoCs
  • Suspicious use of WriteProcessMemory 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\c5fe1e625c87aa811d76f20079f286f5b9f3b5c971d5ba86350c37327c509981.exe
    "C:\Users\Admin\AppData\Local\Temp\c5fe1e625c87aa811d76f20079f286f5b9f3b5c971d5ba86350c37327c509981.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:1916
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\zbulbigm\
      2⤵
        PID:64
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\ushpiytp.exe" C:\Windows\SysWOW64\zbulbigm\
        2⤵
          PID:4608
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create zbulbigm binPath= "C:\Windows\SysWOW64\zbulbigm\ushpiytp.exe /d\"C:\Users\Admin\AppData\Local\Temp\c5fe1e625c87aa811d76f20079f286f5b9f3b5c971d5ba86350c37327c509981.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:4808
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description zbulbigm "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:4160
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start zbulbigm
          2⤵
          • Launches sc.exe
          PID:2764
        • 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:4000
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 1916 -s 1028
          2⤵
          • Program crash
          PID:4348
      • C:\Windows\SysWOW64\zbulbigm\ushpiytp.exe
        C:\Windows\SysWOW64\zbulbigm\ushpiytp.exe /d"C:\Users\Admin\AppData\Local\Temp\c5fe1e625c87aa811d76f20079f286f5b9f3b5c971d5ba86350c37327c509981.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:3760
        • C:\Windows\SysWOW64\svchost.exe
          svchost.exe
          2⤵
          • Sets service image path in registry
          • Deletes itself
          • Drops file in System32 directory
          • Modifies data under HKEY_USERS
          PID:1384
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3760 -s 508
          2⤵
          • Program crash
          PID:1272
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 464 -p 1916 -ip 1916
        1⤵
          PID:1428
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 188 -p 3760 -ip 3760
          1⤵
            PID:3260

          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

          1
          T1562

          Disable or Modify System Firewall

          1
          T1562.004

          Modify Registry

          1
          T1112

          Discovery

          Query Registry

          1
          T1012

          System Information Discovery

          2
          T1082

          Replay Monitor

          Loading Replay Monitor...

          Downloads

          • C:\Users\Admin\AppData\Local\Temp\ushpiytp.exe
            Filesize

            11.6MB

            MD5

            bcba267beb0542dbf5976e88695142b8

            SHA1

            afd9b346706440fa33113361e861ad620e77247a

            SHA256

            c1dbfb44e34d07ae9827467fe15426a8a95a6ff63f83af05460cb996b07dd3cb

            SHA512

            5fa8db0118afc801d40a7f2a6a6893d289cd126259b0839afa0b1eaaf613977f7ba2e612ceb2e38d790ff669c23455f823f93a97e1365fd4fe5e6ee6f64da040

          • memory/1384-33-0x00000000021F0000-0x0000000002200000-memory.dmp
            Filesize

            64KB

          • memory/1384-48-0x0000000002FD0000-0x0000000002FD5000-memory.dmp
            Filesize

            20KB

          • memory/1384-60-0x0000000000E70000-0x0000000000E85000-memory.dmp
            Filesize

            84KB

          • memory/1384-56-0x0000000002FE0000-0x0000000002FE7000-memory.dmp
            Filesize

            28KB

          • memory/1384-55-0x0000000007A40000-0x0000000007E4B000-memory.dmp
            Filesize

            4.0MB

          • memory/1384-52-0x0000000007A40000-0x0000000007E4B000-memory.dmp
            Filesize

            4.0MB

          • memory/1384-31-0x00000000021F0000-0x0000000002200000-memory.dmp
            Filesize

            64KB

          • memory/1384-51-0x0000000002FD0000-0x0000000002FD5000-memory.dmp
            Filesize

            20KB

          • memory/1384-12-0x0000000000E70000-0x0000000000E85000-memory.dmp
            Filesize

            84KB

          • memory/1384-16-0x0000000000E70000-0x0000000000E85000-memory.dmp
            Filesize

            84KB

          • memory/1384-17-0x0000000000E70000-0x0000000000E85000-memory.dmp
            Filesize

            84KB

          • memory/1384-47-0x00000000021F0000-0x0000000002200000-memory.dmp
            Filesize

            64KB

          • memory/1384-19-0x0000000000E70000-0x0000000000E85000-memory.dmp
            Filesize

            84KB

          • memory/1384-21-0x0000000002A00000-0x0000000002C0F000-memory.dmp
            Filesize

            2.1MB

          • memory/1384-24-0x0000000002A00000-0x0000000002C0F000-memory.dmp
            Filesize

            2.1MB

          • memory/1384-25-0x00000000021E0000-0x00000000021E6000-memory.dmp
            Filesize

            24KB

          • memory/1384-28-0x00000000021F0000-0x0000000002200000-memory.dmp
            Filesize

            64KB

          • memory/1384-34-0x00000000021F0000-0x0000000002200000-memory.dmp
            Filesize

            64KB

          • memory/1384-46-0x00000000021F0000-0x0000000002200000-memory.dmp
            Filesize

            64KB

          • memory/1384-45-0x00000000021F0000-0x0000000002200000-memory.dmp
            Filesize

            64KB

          • memory/1384-32-0x00000000021F0000-0x0000000002200000-memory.dmp
            Filesize

            64KB

          • memory/1384-35-0x00000000021F0000-0x0000000002200000-memory.dmp
            Filesize

            64KB

          • memory/1384-36-0x00000000021F0000-0x0000000002200000-memory.dmp
            Filesize

            64KB

          • memory/1384-37-0x00000000021F0000-0x0000000002200000-memory.dmp
            Filesize

            64KB

          • memory/1384-38-0x00000000021F0000-0x0000000002200000-memory.dmp
            Filesize

            64KB

          • memory/1384-39-0x00000000021F0000-0x0000000002200000-memory.dmp
            Filesize

            64KB

          • memory/1384-40-0x00000000021F0000-0x0000000002200000-memory.dmp
            Filesize

            64KB

          • memory/1384-41-0x00000000021F0000-0x0000000002200000-memory.dmp
            Filesize

            64KB

          • memory/1384-42-0x00000000021F0000-0x0000000002200000-memory.dmp
            Filesize

            64KB

          • memory/1384-43-0x00000000021F0000-0x0000000002200000-memory.dmp
            Filesize

            64KB

          • memory/1384-44-0x00000000021F0000-0x0000000002200000-memory.dmp
            Filesize

            64KB

          • memory/1916-4-0x0000000000400000-0x000000000043F000-memory.dmp
            Filesize

            252KB

          • memory/1916-1-0x00000000006A0000-0x00000000007A0000-memory.dmp
            Filesize

            1024KB

          • memory/1916-9-0x00000000008A0000-0x00000000008B3000-memory.dmp
            Filesize

            76KB

          • memory/1916-8-0x0000000000400000-0x000000000043F000-memory.dmp
            Filesize

            252KB

          • memory/1916-6-0x0000000000400000-0x000000000043F000-memory.dmp
            Filesize

            252KB

          • memory/1916-2-0x00000000008A0000-0x00000000008B3000-memory.dmp
            Filesize

            76KB

          • memory/3760-11-0x00000000005A0000-0x00000000006A0000-memory.dmp
            Filesize

            1024KB

          • memory/3760-18-0x0000000000400000-0x000000000043F000-memory.dmp
            Filesize

            252KB

          • memory/3760-13-0x0000000000400000-0x000000000043F000-memory.dmp
            Filesize

            252KB