Analysis

  • max time kernel
    149s
  • max time network
    151s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240802-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system
  • submitted
    21-09-2024 21:38

General

  • Target

    2IFYYPRUgO.exe

  • Size

    447KB

  • MD5

    dd9983e56e44b300e97fbead17bbb8ec

  • SHA1

    bcfc4f542d1824b23b5beefe94e8eaa9d487e037

  • SHA256

    16c9a4debb518681ece83ec9f4eb3edfab08cc4231243db1949a64c80e017aa4

  • SHA512

    02663157f5a109a122897fb0ac32eda38a9ed5d289b70ef1541e3ca800e02a41d471879e04d1bd59eb2110e4a0f8cd7851e3bacba04147ffa488997e8a100457

  • SSDEEP

    6144:XZBpoyz+AlKudZ10mVtZ4ELIgjdo7d5UNo4MaGSlrLo5FXCnFk:Xruyz+PMZ10mVrLL/27gWxerCSC

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).

  • Event Triggered Execution: Netsh Helper DLL 1 TTPs 3 IoCs

    Netsh.exe (also referred to as Netshell) is a command-line scripting utility used to interact with the network configuration of a system.

  • Program crash 2 IoCs
  • System Location Discovery: System Language Discovery 1 TTPs 9 IoCs

    Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

  • Modifies data under HKEY_USERS 6 IoCs
  • Suspicious use of WriteProcessMemory 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\2IFYYPRUgO.exe
    "C:\Users\Admin\AppData\Local\Temp\2IFYYPRUgO.exe"
    1⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:212
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\eyyhvord\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:4864
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\qxavuooi.exe" C:\Windows\SysWOW64\eyyhvord\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:1528
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create eyyhvord binPath= "C:\Windows\SysWOW64\eyyhvord\qxavuooi.exe /d\"C:\Users\Admin\AppData\Local\Temp\2IFYYPRUgO.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:2072
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description eyyhvord "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:3660
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start eyyhvord
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:1180
    • 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
      • Event Triggered Execution: Netsh Helper DLL
      • System Location Discovery: System Language Discovery
      PID:1964
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 212 -s 792
      2⤵
      • Program crash
      PID:5100
  • C:\Windows\SysWOW64\eyyhvord\qxavuooi.exe
    C:\Windows\SysWOW64\eyyhvord\qxavuooi.exe /d"C:\Users\Admin\AppData\Local\Temp\2IFYYPRUgO.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2060
    • C:\Windows\SysWOW64\svchost.exe
      svchost.exe
      2⤵
      • Sets service image path in registry
      • Deletes itself
      • Drops file in System32 directory
      • System Location Discovery: System Language Discovery
      • Modifies data under HKEY_USERS
      PID:2168
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 2060 -s 516
      2⤵
      • Program crash
      PID:2908
  • C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 212 -ip 212
    1⤵
      PID:1532
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -pss -s 532 -p 2060 -ip 2060
      1⤵
        PID:3912
      • C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
        "C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --field-trial-handle=4512,i,4174666705242427184,7333705955694532165,262144 --variations-seed-version --mojo-platform-channel-handle=4224 /prefetch:8
        1⤵
          PID:3860

        Network

        MITRE ATT&CK Enterprise v15

        Replay Monitor

        Loading Replay Monitor...

        Downloads

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

          Filesize

          14.4MB

          MD5

          c2ff0f02c8429b807485ef0e90dcba4c

          SHA1

          27fb4160260057befab65d0c60b832f298da2742

          SHA256

          d3df66db604b25c3db0f25807ee04b97034198b91018026dcde8d50201bf5d5c

          SHA512

          ca38f7c37f98808f69be78c6a03aa10be0efa2783dbdd893ee9ce80a1bc24c517f7f9070c4e8e830ec0d5aa0b5e49480e3bf1400bf129ecd27529f0b56d52c3e

        • memory/212-2-0x00000000041D0000-0x00000000041E3000-memory.dmp

          Filesize

          76KB

        • memory/212-3-0x0000000000400000-0x0000000000415000-memory.dmp

          Filesize

          84KB

        • memory/212-9-0x0000000000400000-0x0000000000415000-memory.dmp

          Filesize

          84KB

        • memory/212-8-0x00000000041D0000-0x00000000041E3000-memory.dmp

          Filesize

          76KB

        • memory/212-7-0x0000000000400000-0x0000000002488000-memory.dmp

          Filesize

          32.5MB

        • memory/212-1-0x0000000002710000-0x0000000002810000-memory.dmp

          Filesize

          1024KB

        • memory/2060-15-0x0000000000400000-0x0000000002488000-memory.dmp

          Filesize

          32.5MB

        • memory/2168-41-0x0000000002170000-0x0000000002180000-memory.dmp

          Filesize

          64KB

        • memory/2168-36-0x0000000002170000-0x0000000002180000-memory.dmp

          Filesize

          64KB

        • memory/2168-13-0x0000000000BB0000-0x0000000000BC5000-memory.dmp

          Filesize

          84KB

        • memory/2168-32-0x0000000002170000-0x0000000002180000-memory.dmp

          Filesize

          64KB

        • memory/2168-52-0x0000000002FE0000-0x0000000002FE7000-memory.dmp

          Filesize

          28KB

        • memory/2168-48-0x0000000007980000-0x0000000007D8B000-memory.dmp

          Filesize

          4.0MB

        • memory/2168-47-0x0000000002FD0000-0x0000000002FD5000-memory.dmp

          Filesize

          20KB

        • memory/2168-44-0x0000000002FD0000-0x0000000002FD5000-memory.dmp

          Filesize

          20KB

        • memory/2168-43-0x0000000002170000-0x0000000002180000-memory.dmp

          Filesize

          64KB

        • memory/2168-42-0x0000000002170000-0x0000000002180000-memory.dmp

          Filesize

          64KB

        • memory/2168-11-0x0000000000BB0000-0x0000000000BC5000-memory.dmp

          Filesize

          84KB

        • memory/2168-40-0x0000000002170000-0x0000000002180000-memory.dmp

          Filesize

          64KB

        • memory/2168-39-0x0000000002170000-0x0000000002180000-memory.dmp

          Filesize

          64KB

        • memory/2168-38-0x0000000002170000-0x0000000002180000-memory.dmp

          Filesize

          64KB

        • memory/2168-37-0x0000000002170000-0x0000000002180000-memory.dmp

          Filesize

          64KB

        • memory/2168-14-0x0000000000BB0000-0x0000000000BC5000-memory.dmp

          Filesize

          84KB

        • memory/2168-35-0x0000000002170000-0x0000000002180000-memory.dmp

          Filesize

          64KB

        • memory/2168-34-0x0000000002170000-0x0000000002180000-memory.dmp

          Filesize

          64KB

        • memory/2168-33-0x0000000002170000-0x0000000002180000-memory.dmp

          Filesize

          64KB

        • memory/2168-31-0x0000000002170000-0x0000000002180000-memory.dmp

          Filesize

          64KB

        • memory/2168-30-0x0000000002170000-0x0000000002180000-memory.dmp

          Filesize

          64KB

        • memory/2168-29-0x0000000002170000-0x0000000002180000-memory.dmp

          Filesize

          64KB

        • memory/2168-28-0x0000000002170000-0x0000000002180000-memory.dmp

          Filesize

          64KB

        • memory/2168-27-0x0000000002170000-0x0000000002180000-memory.dmp

          Filesize

          64KB

        • memory/2168-20-0x0000000002A00000-0x0000000002C0F000-memory.dmp

          Filesize

          2.1MB

        • memory/2168-51-0x0000000007980000-0x0000000007D8B000-memory.dmp

          Filesize

          4.0MB

        • memory/2168-17-0x0000000002A00000-0x0000000002C0F000-memory.dmp

          Filesize

          2.1MB

        • memory/2168-24-0x0000000002170000-0x0000000002180000-memory.dmp

          Filesize

          64KB

        • memory/2168-21-0x0000000002160000-0x0000000002166000-memory.dmp

          Filesize

          24KB