Analysis

  • max time kernel
    145s
  • max time network
    148s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240508-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240508-enlocale:en-usos:windows10-2004-x64system
  • submitted
    22-05-2024 14:46

General

  • Target

    8eb33da353d3756d8cd4cb9308fd5ef72a9b35441bec41fd17c3f3ee508ea9ab.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 6 IoCs
  • Suspicious use of WriteProcessMemory 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\8eb33da353d3756d8cd4cb9308fd5ef72a9b35441bec41fd17c3f3ee508ea9ab.exe
    "C:\Users\Admin\AppData\Local\Temp\8eb33da353d3756d8cd4cb9308fd5ef72a9b35441bec41fd17c3f3ee508ea9ab.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:4468
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\fxczvfw\
      2⤵
        PID:3532
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\qxwjrrzd.exe" C:\Windows\SysWOW64\fxczvfw\
        2⤵
          PID:3120
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create fxczvfw binPath= "C:\Windows\SysWOW64\fxczvfw\qxwjrrzd.exe /d\"C:\Users\Admin\AppData\Local\Temp\8eb33da353d3756d8cd4cb9308fd5ef72a9b35441bec41fd17c3f3ee508ea9ab.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:3048
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description fxczvfw "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:4760
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start fxczvfw
          2⤵
          • Launches sc.exe
          PID:1196
        • 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:3656
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4468 -s 1036
          2⤵
          • Program crash
          PID:3604
      • C:\Windows\SysWOW64\fxczvfw\qxwjrrzd.exe
        C:\Windows\SysWOW64\fxczvfw\qxwjrrzd.exe /d"C:\Users\Admin\AppData\Local\Temp\8eb33da353d3756d8cd4cb9308fd5ef72a9b35441bec41fd17c3f3ee508ea9ab.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:4528
        • 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:2284
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4528 -s 524
          2⤵
          • Program crash
          PID:3180
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 456 -p 4468 -ip 4468
        1⤵
          PID:2352
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 536 -p 4528 -ip 4528
          1⤵
            PID:1628

          Network

          MITRE ATT&CK Enterprise v15

          Replay Monitor

          Loading Replay Monitor...

          Downloads

          • C:\Users\Admin\AppData\Local\Temp\qxwjrrzd.exe

            Filesize

            10.7MB

            MD5

            059468af2504298aebb4ce50daec9cc1

            SHA1

            91c89242437836ed5157557647fd7e4f32e16b4b

            SHA256

            1592d9c23910700614455620978b3193cff0edc7d9a38d702d611a05060bd009

            SHA512

            b5b7ec77339c72813399b33647a47e10f45428b132c2109b678567656e14609d82ec3ceb07239cc18acd9cee97ec1e6b9e8ab0b483a0c25f5e4fe59016a1b736

          • memory/2284-37-0x0000000001F50000-0x0000000001F60000-memory.dmp

            Filesize

            64KB

          • memory/2284-27-0x0000000001F50000-0x0000000001F60000-memory.dmp

            Filesize

            64KB

          • memory/2284-24-0x0000000001F40000-0x0000000001F46000-memory.dmp

            Filesize

            24KB

          • memory/2284-43-0x0000000001F50000-0x0000000001F60000-memory.dmp

            Filesize

            64KB

          • memory/2284-30-0x0000000001F50000-0x0000000001F60000-memory.dmp

            Filesize

            64KB

          • memory/2284-21-0x0000000002800000-0x0000000002A0F000-memory.dmp

            Filesize

            2.1MB

          • memory/2284-11-0x0000000000980000-0x0000000000995000-memory.dmp

            Filesize

            84KB

          • memory/2284-23-0x0000000002800000-0x0000000002A0F000-memory.dmp

            Filesize

            2.1MB

          • memory/2284-45-0x0000000001F50000-0x0000000001F60000-memory.dmp

            Filesize

            64KB

          • memory/2284-31-0x0000000001F50000-0x0000000001F60000-memory.dmp

            Filesize

            64KB

          • memory/2284-17-0x0000000000980000-0x0000000000995000-memory.dmp

            Filesize

            84KB

          • memory/2284-18-0x0000000000980000-0x0000000000995000-memory.dmp

            Filesize

            84KB

          • memory/2284-54-0x0000000007780000-0x0000000007B8B000-memory.dmp

            Filesize

            4.0MB

          • memory/2284-55-0x0000000001FF0000-0x0000000001FF7000-memory.dmp

            Filesize

            28KB

          • memory/2284-51-0x0000000007780000-0x0000000007B8B000-memory.dmp

            Filesize

            4.0MB

          • memory/2284-50-0x0000000001FE0000-0x0000000001FE5000-memory.dmp

            Filesize

            20KB

          • memory/2284-47-0x0000000001FE0000-0x0000000001FE5000-memory.dmp

            Filesize

            20KB

          • memory/2284-46-0x0000000001F50000-0x0000000001F60000-memory.dmp

            Filesize

            64KB

          • memory/2284-32-0x0000000001F50000-0x0000000001F60000-memory.dmp

            Filesize

            64KB

          • memory/2284-33-0x0000000001F50000-0x0000000001F60000-memory.dmp

            Filesize

            64KB

          • memory/2284-38-0x0000000001F50000-0x0000000001F60000-memory.dmp

            Filesize

            64KB

          • memory/2284-42-0x0000000001F50000-0x0000000001F60000-memory.dmp

            Filesize

            64KB

          • memory/2284-41-0x0000000001F50000-0x0000000001F60000-memory.dmp

            Filesize

            64KB

          • memory/2284-40-0x0000000001F50000-0x0000000001F60000-memory.dmp

            Filesize

            64KB

          • memory/2284-39-0x0000000001F50000-0x0000000001F60000-memory.dmp

            Filesize

            64KB

          • memory/2284-44-0x0000000001F50000-0x0000000001F60000-memory.dmp

            Filesize

            64KB

          • memory/2284-34-0x0000000001F50000-0x0000000001F60000-memory.dmp

            Filesize

            64KB

          • memory/2284-36-0x0000000001F50000-0x0000000001F60000-memory.dmp

            Filesize

            64KB

          • memory/2284-35-0x0000000001F50000-0x0000000001F60000-memory.dmp

            Filesize

            64KB

          • memory/4468-3-0x0000000000400000-0x0000000000415000-memory.dmp

            Filesize

            84KB

          • memory/4468-1-0x00000000004E0000-0x00000000005E0000-memory.dmp

            Filesize

            1024KB

          • memory/4468-14-0x0000000000400000-0x0000000000415000-memory.dmp

            Filesize

            84KB

          • memory/4468-13-0x0000000000400000-0x000000000047D000-memory.dmp

            Filesize

            500KB

          • memory/4468-2-0x0000000002080000-0x0000000002093000-memory.dmp

            Filesize

            76KB

          • memory/4528-16-0x0000000000400000-0x000000000047D000-memory.dmp

            Filesize

            500KB

          • memory/4528-10-0x0000000000400000-0x000000000047D000-memory.dmp

            Filesize

            500KB

          • memory/4528-8-0x0000000000400000-0x000000000047D000-memory.dmp

            Filesize

            500KB

          • memory/4528-9-0x0000000000400000-0x000000000047D000-memory.dmp

            Filesize

            500KB