Analysis

  • max time kernel
    147s
  • 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
    05-09-2024 20:20

General

  • Target

    ee9e9a1840ff7f83b91b8eb3fc1e03df51aee5a94ac9cb3c63c0a37a9f3fcdd5.exe

  • Size

    400KB

  • MD5

    aa92bc82a2b3c733b305eef3ccb7ae6e

  • SHA1

    b52729db10f5c62ea03f4280e16cbd5304487bcb

  • SHA256

    ee9e9a1840ff7f83b91b8eb3fc1e03df51aee5a94ac9cb3c63c0a37a9f3fcdd5

  • SHA512

    de5d0741196ae12200d35736dc37f7d7fb809e63378ba5b0b8f0da962c608037f2e9ff6b35a371fd0a0d7182da86f3338697c47fbd246a0c1831a14edbead8b3

  • SSDEEP

    6144:ctBJHpf5eNmB7EEE+zwN6mdDHRIdJCBODBhMJWlN6w:ctBJHpfANmhrmdadJ5kO

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
  • Looks up external IP address via web service 2 IoCs

    Uses a legitimate IP lookup service to find the infected system's external IP.

  • 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\ee9e9a1840ff7f83b91b8eb3fc1e03df51aee5a94ac9cb3c63c0a37a9f3fcdd5.exe
    "C:\Users\Admin\AppData\Local\Temp\ee9e9a1840ff7f83b91b8eb3fc1e03df51aee5a94ac9cb3c63c0a37a9f3fcdd5.exe"
    1⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:572
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\utvdpmsi\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:2856
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\szcxwqqk.exe" C:\Windows\SysWOW64\utvdpmsi\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:5000
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create utvdpmsi binPath= "C:\Windows\SysWOW64\utvdpmsi\szcxwqqk.exe /d\"C:\Users\Admin\AppData\Local\Temp\ee9e9a1840ff7f83b91b8eb3fc1e03df51aee5a94ac9cb3c63c0a37a9f3fcdd5.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:1036
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description utvdpmsi "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:2432
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start utvdpmsi
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:4848
    • 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:844
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 572 -s 1200
      2⤵
      • Program crash
      PID:5048
  • C:\Windows\SysWOW64\utvdpmsi\szcxwqqk.exe
    C:\Windows\SysWOW64\utvdpmsi\szcxwqqk.exe /d"C:\Users\Admin\AppData\Local\Temp\ee9e9a1840ff7f83b91b8eb3fc1e03df51aee5a94ac9cb3c63c0a37a9f3fcdd5.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:4100
    • 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:4380
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 4100 -s 528
      2⤵
      • Program crash
      PID:3100
  • C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -pss -s 448 -p 572 -ip 572
    1⤵
      PID:4976
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -pss -s 428 -p 4100 -ip 4100
      1⤵
        PID:4768

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

      Loading Replay Monitor...

      Downloads

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

        Filesize

        12.9MB

        MD5

        16524d452269ece93a7354747cea1127

        SHA1

        dfb620231a129023f861a15c95f25c46229fd2ae

        SHA256

        4684265748cc4a11e85cde7f79ae559bde44f2e9bf99279fc656db93587f002e

        SHA512

        dc86c45bcb86c5042ac6048fe1c4f1cc664f993983f7fc25f94c62ad0a86476343b3f27f5ceae545e67a996dc4d26af9ba1cff67740684236cc11f1b12a24d50

      • memory/572-2-0x00000000041C0000-0x00000000041D3000-memory.dmp

        Filesize

        76KB

      • memory/572-4-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/572-9-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/572-8-0x00000000041C0000-0x00000000041D3000-memory.dmp

        Filesize

        76KB

      • memory/572-7-0x0000000000400000-0x000000000247C000-memory.dmp

        Filesize

        32.5MB

      • memory/572-1-0x00000000025E0000-0x00000000026E0000-memory.dmp

        Filesize

        1024KB

      • memory/4100-15-0x0000000000400000-0x000000000247C000-memory.dmp

        Filesize

        32.5MB

      • memory/4380-42-0x0000000001F60000-0x0000000001F70000-memory.dmp

        Filesize

        64KB

      • memory/4380-36-0x0000000001F60000-0x0000000001F70000-memory.dmp

        Filesize

        64KB

      • memory/4380-13-0x00000000009A0000-0x00000000009B5000-memory.dmp

        Filesize

        84KB

      • memory/4380-17-0x0000000002800000-0x0000000002A0F000-memory.dmp

        Filesize

        2.1MB

      • memory/4380-37-0x0000000001F60000-0x0000000001F70000-memory.dmp

        Filesize

        64KB

      • memory/4380-52-0x0000000002DD0000-0x0000000002DD7000-memory.dmp

        Filesize

        28KB

      • memory/4380-51-0x0000000007780000-0x0000000007B8B000-memory.dmp

        Filesize

        4.0MB

      • memory/4380-47-0x0000000001FF0000-0x0000000001FF5000-memory.dmp

        Filesize

        20KB

      • memory/4380-44-0x0000000001FF0000-0x0000000001FF5000-memory.dmp

        Filesize

        20KB

      • memory/4380-43-0x0000000001F60000-0x0000000001F70000-memory.dmp

        Filesize

        64KB

      • memory/4380-11-0x00000000009A0000-0x00000000009B5000-memory.dmp

        Filesize

        84KB

      • memory/4380-41-0x0000000001F60000-0x0000000001F70000-memory.dmp

        Filesize

        64KB

      • memory/4380-40-0x0000000001F60000-0x0000000001F70000-memory.dmp

        Filesize

        64KB

      • memory/4380-39-0x0000000001F60000-0x0000000001F70000-memory.dmp

        Filesize

        64KB

      • memory/4380-38-0x0000000001F60000-0x0000000001F70000-memory.dmp

        Filesize

        64KB

      • memory/4380-14-0x00000000009A0000-0x00000000009B5000-memory.dmp

        Filesize

        84KB

      • memory/4380-35-0x0000000001F60000-0x0000000001F70000-memory.dmp

        Filesize

        64KB

      • memory/4380-34-0x0000000001F60000-0x0000000001F70000-memory.dmp

        Filesize

        64KB

      • memory/4380-33-0x0000000001F60000-0x0000000001F70000-memory.dmp

        Filesize

        64KB

      • memory/4380-32-0x0000000001F60000-0x0000000001F70000-memory.dmp

        Filesize

        64KB

      • memory/4380-31-0x0000000001F60000-0x0000000001F70000-memory.dmp

        Filesize

        64KB

      • memory/4380-30-0x0000000001F60000-0x0000000001F70000-memory.dmp

        Filesize

        64KB

      • memory/4380-29-0x0000000001F60000-0x0000000001F70000-memory.dmp

        Filesize

        64KB

      • memory/4380-28-0x0000000001F60000-0x0000000001F70000-memory.dmp

        Filesize

        64KB

      • memory/4380-27-0x0000000001F60000-0x0000000001F70000-memory.dmp

        Filesize

        64KB

      • memory/4380-24-0x0000000001F60000-0x0000000001F70000-memory.dmp

        Filesize

        64KB

      • memory/4380-21-0x0000000001F50000-0x0000000001F56000-memory.dmp

        Filesize

        24KB

      • memory/4380-20-0x0000000002800000-0x0000000002A0F000-memory.dmp

        Filesize

        2.1MB

      • memory/4380-49-0x0000000007780000-0x0000000007B8B000-memory.dmp

        Filesize

        4.0MB