Analysis

  • max time kernel
    150s
  • 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
    04/09/2024, 09:41

General

  • Target

    02c6f9163a5d988cee3ab12c11e03b18329c26d6b4863004f943133654693e97.exe

  • Size

    213KB

  • MD5

    a3247152e18ba6e88311f082a86515d3

  • SHA1

    80da2f14bb17f2d3ff1df6faf25622ebb8cf00c8

  • SHA256

    02c6f9163a5d988cee3ab12c11e03b18329c26d6b4863004f943133654693e97

  • SHA512

    b09fc49d7126b37c37f499be522c4b57e7538d2f64600bd789c93d90a315a023f0fbed9466c6069a38bb8c80bc9a6b250fcaec03b59ecfb3a40754c235c3e6d8

  • SSDEEP

    3072:AOFL8HN3BB33u/iMUk6efofpWqX2hnesi5kb:tLqN3Bt36iM/ofpKhn9

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 7 IoCs
  • Suspicious use of WriteProcessMemory 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\02c6f9163a5d988cee3ab12c11e03b18329c26d6b4863004f943133654693e97.exe
    "C:\Users\Admin\AppData\Local\Temp\02c6f9163a5d988cee3ab12c11e03b18329c26d6b4863004f943133654693e97.exe"
    1⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:3948
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\kcbvghtj\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:564
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\qxwjrrzd.exe" C:\Windows\SysWOW64\kcbvghtj\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:1752
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create kcbvghtj binPath= "C:\Windows\SysWOW64\kcbvghtj\qxwjrrzd.exe /d\"C:\Users\Admin\AppData\Local\Temp\02c6f9163a5d988cee3ab12c11e03b18329c26d6b4863004f943133654693e97.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:3704
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description kcbvghtj "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:4716
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start kcbvghtj
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:540
    • 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:1504
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 3948 -s 892
      2⤵
      • Program crash
      PID:3224
  • C:\Windows\SysWOW64\kcbvghtj\qxwjrrzd.exe
    C:\Windows\SysWOW64\kcbvghtj\qxwjrrzd.exe /d"C:\Users\Admin\AppData\Local\Temp\02c6f9163a5d988cee3ab12c11e03b18329c26d6b4863004f943133654693e97.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:4816
    • 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:4668
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 4816 -s 516
      2⤵
      • Program crash
      PID:3944
  • C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 3948 -ip 3948
    1⤵
      PID:1652
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -pss -s 448 -p 4816 -ip 4816
      1⤵
        PID:3560

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

      Loading Replay Monitor...

      Downloads

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

        Filesize

        14.8MB

        MD5

        80ade488d5f49646c04d80c2e86674ec

        SHA1

        1028ec617711ff45adb495d507cff2b69cf94a74

        SHA256

        d9b75c9ff86f12f6c65c3cbb761b998d8c1cb50336b7b9f8c5632361cd5fbd90

        SHA512

        399e59a836d2597eb8ac5f62fa05009f8be3ed1abf3a9579ec13480408aedb2050509689564651be59e7381896c12dffc07af7270d0ea1dc1105f08990137e48

      • memory/3948-1-0x0000000000490000-0x0000000000590000-memory.dmp

        Filesize

        1024KB

      • memory/3948-2-0x0000000002190000-0x00000000021A3000-memory.dmp

        Filesize

        76KB

      • memory/3948-3-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/3948-7-0x0000000000400000-0x0000000000448000-memory.dmp

        Filesize

        288KB

      • memory/3948-9-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/3948-8-0x0000000002190000-0x00000000021A3000-memory.dmp

        Filesize

        76KB

      • memory/4668-50-0x00000000019E0000-0x00000000019E5000-memory.dmp

        Filesize

        20KB

      • memory/4668-43-0x00000000019D0000-0x00000000019E0000-memory.dmp

        Filesize

        64KB

      • memory/4668-54-0x0000000007200000-0x000000000760B000-memory.dmp

        Filesize

        4.0MB

      • memory/4668-14-0x0000000000610000-0x0000000000625000-memory.dmp

        Filesize

        84KB

      • memory/4668-16-0x0000000000610000-0x0000000000625000-memory.dmp

        Filesize

        84KB

      • memory/4668-17-0x0000000000610000-0x0000000000625000-memory.dmp

        Filesize

        84KB

      • memory/4668-23-0x0000000002200000-0x000000000240F000-memory.dmp

        Filesize

        2.1MB

      • memory/4668-44-0x00000000019D0000-0x00000000019E0000-memory.dmp

        Filesize

        64KB

      • memory/4668-33-0x00000000019D0000-0x00000000019E0000-memory.dmp

        Filesize

        64KB

      • memory/4668-21-0x0000000002200000-0x000000000240F000-memory.dmp

        Filesize

        2.1MB

      • memory/4668-24-0x00000000019C0000-0x00000000019C6000-memory.dmp

        Filesize

        24KB

      • memory/4668-51-0x0000000007200000-0x000000000760B000-memory.dmp

        Filesize

        4.0MB

      • memory/4668-55-0x00000000019F0000-0x00000000019F7000-memory.dmp

        Filesize

        28KB

      • memory/4668-27-0x00000000019D0000-0x00000000019E0000-memory.dmp

        Filesize

        64KB

      • memory/4668-47-0x00000000019E0000-0x00000000019E5000-memory.dmp

        Filesize

        20KB

      • memory/4668-46-0x00000000019D0000-0x00000000019E0000-memory.dmp

        Filesize

        64KB

      • memory/4668-45-0x00000000019D0000-0x00000000019E0000-memory.dmp

        Filesize

        64KB

      • memory/4668-30-0x00000000019D0000-0x00000000019E0000-memory.dmp

        Filesize

        64KB

      • memory/4668-42-0x00000000019D0000-0x00000000019E0000-memory.dmp

        Filesize

        64KB

      • memory/4668-41-0x00000000019D0000-0x00000000019E0000-memory.dmp

        Filesize

        64KB

      • memory/4668-40-0x00000000019D0000-0x00000000019E0000-memory.dmp

        Filesize

        64KB

      • memory/4668-39-0x00000000019D0000-0x00000000019E0000-memory.dmp

        Filesize

        64KB

      • memory/4668-38-0x00000000019D0000-0x00000000019E0000-memory.dmp

        Filesize

        64KB

      • memory/4668-37-0x00000000019D0000-0x00000000019E0000-memory.dmp

        Filesize

        64KB

      • memory/4668-36-0x00000000019D0000-0x00000000019E0000-memory.dmp

        Filesize

        64KB

      • memory/4668-35-0x00000000019D0000-0x00000000019E0000-memory.dmp

        Filesize

        64KB

      • memory/4668-34-0x00000000019D0000-0x00000000019E0000-memory.dmp

        Filesize

        64KB

      • memory/4668-32-0x00000000019D0000-0x00000000019E0000-memory.dmp

        Filesize

        64KB

      • memory/4668-31-0x00000000019D0000-0x00000000019E0000-memory.dmp

        Filesize

        64KB

      • memory/4816-11-0x0000000000400000-0x0000000000448000-memory.dmp

        Filesize

        288KB

      • memory/4816-12-0x0000000000400000-0x0000000000448000-memory.dmp

        Filesize

        288KB

      • memory/4816-18-0x0000000000400000-0x0000000000448000-memory.dmp

        Filesize

        288KB

      • memory/4816-13-0x0000000000400000-0x0000000000448000-memory.dmp

        Filesize

        288KB