Analysis

  • max time kernel
    147s
  • max time network
    149s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240508-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240508-enlocale:en-usos:windows10-2004-x64system
  • submitted
    21-05-2024 02:39

General

  • Target

    cc3ac85b3c5690d542ed9f3266b9bd83.exe

  • Size

    204KB

  • MD5

    cc3ac85b3c5690d542ed9f3266b9bd83

  • SHA1

    af14f36d9412a1c79453a622a5ad343cc01ca6f7

  • SHA256

    8eb33da353d3756d8cd4cb9308fd5ef72a9b35441bec41fd17c3f3ee508ea9ab

  • SHA512

    f250d0f37cd513dd6e647355bd1940d7210093eb27a1bf2d6dbe6ef8673af731c7dccef24c9948a36ac4e06a18803c9082fb7db7ba59a5ecbf94d064981c6a74

  • SSDEEP

    3072:hpBsWcSkjvEOx+ss6IR15t471Z6/MJlJnmd772g+iBGLYS:h87S4PIj54brGj+i6Y

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) 2 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\cc3ac85b3c5690d542ed9f3266b9bd83.exe
    "C:\Users\Admin\AppData\Local\Temp\cc3ac85b3c5690d542ed9f3266b9bd83.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:4904
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\mifxzzqj\
      2⤵
        PID:4908
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\dblmoknt.exe" C:\Windows\SysWOW64\mifxzzqj\
        2⤵
          PID:3244
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create mifxzzqj binPath= "C:\Windows\SysWOW64\mifxzzqj\dblmoknt.exe /d\"C:\Users\Admin\AppData\Local\Temp\cc3ac85b3c5690d542ed9f3266b9bd83.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:3104
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description mifxzzqj "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:4936
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start mifxzzqj
          2⤵
          • Launches sc.exe
          PID:812
        • 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:4052
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4904 -s 676
          2⤵
          • Program crash
          PID:3388
      • C:\Windows\SysWOW64\mifxzzqj\dblmoknt.exe
        C:\Windows\SysWOW64\mifxzzqj\dblmoknt.exe /d"C:\Users\Admin\AppData\Local\Temp\cc3ac85b3c5690d542ed9f3266b9bd83.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:2900
        • 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:2884
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 2900 -s 524
          2⤵
          • Program crash
          PID:1456
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 472 -p 4904 -ip 4904
        1⤵
          PID:1476
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 452 -p 2900 -ip 2900
          1⤵
            PID:4400

          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

          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\dblmoknt.exe
            Filesize

            13.8MB

            MD5

            224447f879535135d0b8c30be8cef358

            SHA1

            a5e9e0c94857b74ae29631e2cd9656c1946ebaa4

            SHA256

            7551cd6a52885193768dff31673c5da142c343d042ab04716a686290ddccce6e

            SHA512

            9e6f4d9b1092563e8f0ef223f65b1b28a27b0c4b18445b0605f2a1c17baebb3aca1aea6732e88358cc5031d4e66dcbc592c1a8b93467cfb4931ef066d191d0f8

          • memory/2884-39-0x0000000001F90000-0x0000000001FA0000-memory.dmp
            Filesize

            64KB

          • memory/2884-40-0x0000000001F90000-0x0000000001FA0000-memory.dmp
            Filesize

            64KB

          • memory/2884-61-0x0000000000AC0000-0x0000000000AD5000-memory.dmp
            Filesize

            84KB

          • memory/2884-25-0x0000000002800000-0x0000000002A0F000-memory.dmp
            Filesize

            2.1MB

          • memory/2884-26-0x0000000001F80000-0x0000000001F86000-memory.dmp
            Filesize

            24KB

          • memory/2884-13-0x0000000000AC0000-0x0000000000AD5000-memory.dmp
            Filesize

            84KB

          • memory/2884-57-0x0000000001FF0000-0x0000000001FF7000-memory.dmp
            Filesize

            28KB

          • memory/2884-32-0x0000000001F90000-0x0000000001FA0000-memory.dmp
            Filesize

            64KB

          • memory/2884-33-0x0000000001F90000-0x0000000001FA0000-memory.dmp
            Filesize

            64KB

          • memory/2884-56-0x0000000007700000-0x0000000007B0B000-memory.dmp
            Filesize

            4.0MB

          • memory/2884-35-0x0000000001F90000-0x0000000001FA0000-memory.dmp
            Filesize

            64KB

          • memory/2884-19-0x0000000000AC0000-0x0000000000AD5000-memory.dmp
            Filesize

            84KB

          • memory/2884-20-0x0000000000AC0000-0x0000000000AD5000-memory.dmp
            Filesize

            84KB

          • memory/2884-22-0x0000000002800000-0x0000000002A0F000-memory.dmp
            Filesize

            2.1MB

          • memory/2884-29-0x0000000001F90000-0x0000000001FA0000-memory.dmp
            Filesize

            64KB

          • memory/2884-52-0x0000000001FE0000-0x0000000001FE5000-memory.dmp
            Filesize

            20KB

          • memory/2884-53-0x0000000007700000-0x0000000007B0B000-memory.dmp
            Filesize

            4.0MB

          • memory/2884-48-0x0000000001F90000-0x0000000001FA0000-memory.dmp
            Filesize

            64KB

          • memory/2884-10-0x0000000000AC0000-0x0000000000AD5000-memory.dmp
            Filesize

            84KB

          • memory/2884-34-0x0000000001F90000-0x0000000001FA0000-memory.dmp
            Filesize

            64KB

          • memory/2884-49-0x0000000001FE0000-0x0000000001FE5000-memory.dmp
            Filesize

            20KB

          • memory/2884-47-0x0000000001F90000-0x0000000001FA0000-memory.dmp
            Filesize

            64KB

          • memory/2884-46-0x0000000001F90000-0x0000000001FA0000-memory.dmp
            Filesize

            64KB

          • memory/2884-45-0x0000000001F90000-0x0000000001FA0000-memory.dmp
            Filesize

            64KB

          • memory/2884-44-0x0000000001F90000-0x0000000001FA0000-memory.dmp
            Filesize

            64KB

          • memory/2884-43-0x0000000001F90000-0x0000000001FA0000-memory.dmp
            Filesize

            64KB

          • memory/2884-42-0x0000000001F90000-0x0000000001FA0000-memory.dmp
            Filesize

            64KB

          • memory/2884-41-0x0000000001F90000-0x0000000001FA0000-memory.dmp
            Filesize

            64KB

          • memory/2884-36-0x0000000001F90000-0x0000000001FA0000-memory.dmp
            Filesize

            64KB

          • memory/2884-37-0x0000000001F90000-0x0000000001FA0000-memory.dmp
            Filesize

            64KB

          • memory/2884-38-0x0000000001F90000-0x0000000001FA0000-memory.dmp
            Filesize

            64KB

          • memory/2900-15-0x0000000000400000-0x000000000047D000-memory.dmp
            Filesize

            500KB

          • memory/2900-8-0x0000000000400000-0x000000000047D000-memory.dmp
            Filesize

            500KB

          • memory/2900-9-0x0000000000400000-0x000000000047D000-memory.dmp
            Filesize

            500KB

          • memory/4904-1-0x00000000004B0000-0x00000000005B0000-memory.dmp
            Filesize

            1024KB

          • memory/4904-2-0x0000000000490000-0x00000000004A3000-memory.dmp
            Filesize

            76KB

          • memory/4904-16-0x0000000000400000-0x000000000047D000-memory.dmp
            Filesize

            500KB

          • memory/4904-17-0x0000000000490000-0x00000000004A3000-memory.dmp
            Filesize

            76KB

          • memory/4904-18-0x0000000000400000-0x0000000000415000-memory.dmp
            Filesize

            84KB

          • memory/4904-3-0x0000000000400000-0x0000000000415000-memory.dmp
            Filesize

            84KB