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Analysis

  • max time kernel
    148s
  • max time network
    150s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240709-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240709-enlocale:en-usos:windows10-2004-x64system
  • submitted
    20/07/2024, 22:10

General

  • Target

    61e48789ffe85d3f4ad3a4b35888db4760d2cac61f032befe8284f94b32684aa.exe

  • Size

    292KB

  • MD5

    cd2867400d86adf084a13deec86d2c39

  • SHA1

    92263b1eef5d2e25cfb0c5060f3b9e25cd69779f

  • SHA256

    61e48789ffe85d3f4ad3a4b35888db4760d2cac61f032befe8284f94b32684aa

  • SHA512

    3b6225ea43362c8c468f3bf37cd2365ae447efe7c1a347504ef10aeead0e0c602f5bae3270efe738ee82630880a4b8637904c484eabd85eb22670764f4479d4b

  • SSDEEP

    3072:Aw2bSHEENJRNgwkvXKATeyRhJLcXm65tz3CnfBpg23ic9gvL4Z:L2bNWJRz2Xnh+H5t7CnJp7uj4

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
  • Modifies data under HKEY_USERS 7 IoCs
  • Suspicious use of WriteProcessMemory 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\61e48789ffe85d3f4ad3a4b35888db4760d2cac61f032befe8284f94b32684aa.exe
    "C:\Users\Admin\AppData\Local\Temp\61e48789ffe85d3f4ad3a4b35888db4760d2cac61f032befe8284f94b32684aa.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:844
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\oibnfxpm\
      2⤵
        PID:2672
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\ktzkixp.exe" C:\Windows\SysWOW64\oibnfxpm\
        2⤵
          PID:3544
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create oibnfxpm binPath= "C:\Windows\SysWOW64\oibnfxpm\ktzkixp.exe /d\"C:\Users\Admin\AppData\Local\Temp\61e48789ffe85d3f4ad3a4b35888db4760d2cac61f032befe8284f94b32684aa.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:3572
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description oibnfxpm "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:4008
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start oibnfxpm
          2⤵
          • Launches sc.exe
          PID:920
        • 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
          PID:2952
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 844 -s 1220
          2⤵
          • Program crash
          PID:744
      • C:\Windows\SysWOW64\oibnfxpm\ktzkixp.exe
        C:\Windows\SysWOW64\oibnfxpm\ktzkixp.exe /d"C:\Users\Admin\AppData\Local\Temp\61e48789ffe85d3f4ad3a4b35888db4760d2cac61f032befe8284f94b32684aa.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:2640
        • 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:1416
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 2640 -s 556
          2⤵
          • Program crash
          PID:4036
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 844 -ip 844
        1⤵
          PID:1336
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 440 -p 2640 -ip 2640
          1⤵
            PID:3172

          Network

          MITRE ATT&CK Enterprise v15

          Replay Monitor

          Loading Replay Monitor...

          Downloads

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

            Filesize

            11.6MB

            MD5

            fd7711631abd24f089776f9b1bcb3d18

            SHA1

            1807156260fbfc775af1257f8bbc3cedabb07bf5

            SHA256

            faa4bfd54b7641d48949b0c0797a783343430c0847a4edce2791aed271c696e5

            SHA512

            eb21f48c582c94999f9db42a79848e51ab241735b9e51d4432064447f335a1f9ae92acf00b82c693ad71d3fe8aaa507e25cd799adc04259ee35033382de2e876

          • memory/844-1-0x00000000025E0000-0x00000000026E0000-memory.dmp

            Filesize

            1024KB

          • memory/844-2-0x00000000041B0000-0x00000000041C3000-memory.dmp

            Filesize

            76KB

          • memory/844-4-0x0000000000400000-0x0000000000415000-memory.dmp

            Filesize

            84KB

          • memory/844-9-0x0000000000400000-0x0000000000415000-memory.dmp

            Filesize

            84KB

          • memory/844-8-0x00000000041B0000-0x00000000041C3000-memory.dmp

            Filesize

            76KB

          • memory/844-7-0x0000000000400000-0x0000000002462000-memory.dmp

            Filesize

            32.4MB

          • memory/1416-42-0x0000000001970000-0x0000000001980000-memory.dmp

            Filesize

            64KB

          • memory/1416-38-0x0000000001970000-0x0000000001980000-memory.dmp

            Filesize

            64KB

          • memory/1416-14-0x00000000004A0000-0x00000000004B5000-memory.dmp

            Filesize

            84KB

          • memory/1416-32-0x0000000001970000-0x0000000001980000-memory.dmp

            Filesize

            64KB

          • memory/1416-17-0x0000000002200000-0x000000000240F000-memory.dmp

            Filesize

            2.1MB

          • memory/1416-30-0x0000000001970000-0x0000000001980000-memory.dmp

            Filesize

            64KB

          • memory/1416-52-0x00000000025E0000-0x00000000025E7000-memory.dmp

            Filesize

            28KB

          • memory/1416-48-0x0000000007080000-0x000000000748B000-memory.dmp

            Filesize

            4.0MB

          • memory/1416-47-0x00000000025D0000-0x00000000025D5000-memory.dmp

            Filesize

            20KB

          • memory/1416-44-0x00000000025D0000-0x00000000025D5000-memory.dmp

            Filesize

            20KB

          • memory/1416-43-0x0000000001970000-0x0000000001980000-memory.dmp

            Filesize

            64KB

          • memory/1416-11-0x00000000004A0000-0x00000000004B5000-memory.dmp

            Filesize

            84KB

          • memory/1416-41-0x0000000001970000-0x0000000001980000-memory.dmp

            Filesize

            64KB

          • memory/1416-40-0x0000000001970000-0x0000000001980000-memory.dmp

            Filesize

            64KB

          • memory/1416-39-0x0000000001970000-0x0000000001980000-memory.dmp

            Filesize

            64KB

          • memory/1416-13-0x00000000004A0000-0x00000000004B5000-memory.dmp

            Filesize

            84KB

          • memory/1416-37-0x0000000001970000-0x0000000001980000-memory.dmp

            Filesize

            64KB

          • memory/1416-36-0x0000000001970000-0x0000000001980000-memory.dmp

            Filesize

            64KB

          • memory/1416-35-0x0000000001970000-0x0000000001980000-memory.dmp

            Filesize

            64KB

          • memory/1416-34-0x0000000001970000-0x0000000001980000-memory.dmp

            Filesize

            64KB

          • memory/1416-33-0x0000000001970000-0x0000000001980000-memory.dmp

            Filesize

            64KB

          • memory/1416-31-0x0000000001970000-0x0000000001980000-memory.dmp

            Filesize

            64KB

          • memory/1416-29-0x0000000001970000-0x0000000001980000-memory.dmp

            Filesize

            64KB

          • memory/1416-28-0x0000000001970000-0x0000000001980000-memory.dmp

            Filesize

            64KB

          • memory/1416-27-0x0000000001970000-0x0000000001980000-memory.dmp

            Filesize

            64KB

          • memory/1416-24-0x0000000001970000-0x0000000001980000-memory.dmp

            Filesize

            64KB

          • memory/1416-21-0x00000000005F0000-0x00000000005F6000-memory.dmp

            Filesize

            24KB

          • memory/1416-20-0x0000000002200000-0x000000000240F000-memory.dmp

            Filesize

            2.1MB

          • memory/1416-51-0x0000000007080000-0x000000000748B000-memory.dmp

            Filesize

            4.0MB

          • memory/2640-15-0x0000000000400000-0x0000000002462000-memory.dmp

            Filesize

            32.4MB