Analysis

  • max time kernel
    154s
  • max time network
    163s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240412-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240412-enlocale:en-usos:windows10-2004-x64system
  • submitted
    17-04-2024 14:14

General

  • Target

    2496bd1f22e675f292a9176022379b39bd6c0a74ca928ca3cca4d639a66f108f.exe

  • Size

    233KB

  • MD5

    b9c89c3ed216df0e259b9d0b38a2dc94

  • SHA1

    ea82873249048a2dc026d8bb24616147a9d95729

  • SHA256

    2496bd1f22e675f292a9176022379b39bd6c0a74ca928ca3cca4d639a66f108f

  • SHA512

    ce196ae521c72a6d6ea968a8a948f5ec7040a79616146e8b175accad9277c4a5e825b3af6d45bfde65f430863c0386a5724dd16e07d9b27878082d86a7644c88

  • SSDEEP

    3072:rJWQg26WaXsiQLhJi3s1KMnwFlscekf3O2D+sYc+VhfRv9ae:rJrSiLslsclz+PZ9f

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) 1 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 7 IoCs
  • Suspicious use of WriteProcessMemory 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\2496bd1f22e675f292a9176022379b39bd6c0a74ca928ca3cca4d639a66f108f.exe
    "C:\Users\Admin\AppData\Local\Temp\2496bd1f22e675f292a9176022379b39bd6c0a74ca928ca3cca4d639a66f108f.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:1008
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\zrpuaslo\
      2⤵
        PID:3516
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\mtsfnnvz.exe" C:\Windows\SysWOW64\zrpuaslo\
        2⤵
          PID:2328
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create zrpuaslo binPath= "C:\Windows\SysWOW64\zrpuaslo\mtsfnnvz.exe /d\"C:\Users\Admin\AppData\Local\Temp\2496bd1f22e675f292a9176022379b39bd6c0a74ca928ca3cca4d639a66f108f.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:3232
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description zrpuaslo "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:4932
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start zrpuaslo
          2⤵
          • Launches sc.exe
          PID:1608
        • 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:3068
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 1008 -s 1036
          2⤵
          • Program crash
          PID:3424
      • C:\Windows\SysWOW64\zrpuaslo\mtsfnnvz.exe
        C:\Windows\SysWOW64\zrpuaslo\mtsfnnvz.exe /d"C:\Users\Admin\AppData\Local\Temp\2496bd1f22e675f292a9176022379b39bd6c0a74ca928ca3cca4d639a66f108f.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:3596
        • 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:4956
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3596 -s 512
          2⤵
          • Program crash
          PID:4704
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 452 -p 1008 -ip 1008
        1⤵
          PID:1708
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 524 -p 3596 -ip 3596
          1⤵
            PID:1504

          Network

          MITRE ATT&CK Matrix ATT&CK v13

          Persistence

          Create or Modify System Process

          2
          T1543

          Windows Service

          2
          T1543.003

          Boot or Logon Autostart Execution

          1
          T1547

          Registry Run Keys / Startup Folder

          1
          T1547.001

          Privilege Escalation

          Create or Modify System Process

          2
          T1543

          Windows Service

          2
          T1543.003

          Boot or Logon Autostart Execution

          1
          T1547

          Registry Run Keys / Startup Folder

          1
          T1547.001

          Defense Evasion

          Impair Defenses

          1
          T1562

          Disable or Modify System Firewall

          1
          T1562.004

          Modify Registry

          1
          T1112

          Discovery

          Query Registry

          1
          T1012

          System Information Discovery

          2
          T1082

          Replay Monitor

          Loading Replay Monitor...

          Downloads

          • C:\Users\Admin\AppData\Local\Temp\mtsfnnvz.exe
            Filesize

            13.0MB

            MD5

            9ad97ac12e25a665e3e26c7ae9f84658

            SHA1

            b8537512d874e83891ef6bf0285c1145a188a7a4

            SHA256

            32ef9c267a7b74930bc72a13507d7de298364579e0b2bac578d3180724a4a205

            SHA512

            dfc731c6caa5bd7bd768e4107b9d28b9567f5a17963521b38a3d2f98cfddd9e78fc86f5f0271e2a5ccfdf3a67410326e3e25400db248d8013e914bb403ebf4d7

          • memory/1008-2-0x00000000005B0000-0x00000000005C3000-memory.dmp
            Filesize

            76KB

          • memory/1008-3-0x0000000000400000-0x000000000043E000-memory.dmp
            Filesize

            248KB

          • memory/1008-7-0x0000000000400000-0x000000000043E000-memory.dmp
            Filesize

            248KB

          • memory/1008-9-0x00000000005B0000-0x00000000005C3000-memory.dmp
            Filesize

            76KB

          • memory/1008-1-0x0000000000600000-0x0000000000700000-memory.dmp
            Filesize

            1024KB

          • memory/3596-17-0x0000000000400000-0x000000000043E000-memory.dmp
            Filesize

            248KB

          • memory/3596-11-0x00000000007B0000-0x00000000008B0000-memory.dmp
            Filesize

            1024KB

          • memory/3596-12-0x0000000000400000-0x000000000043E000-memory.dmp
            Filesize

            248KB

          • memory/4956-32-0x00000000025E0000-0x00000000025F0000-memory.dmp
            Filesize

            64KB

          • memory/4956-38-0x00000000025E0000-0x00000000025F0000-memory.dmp
            Filesize

            64KB

          • memory/4956-18-0x0000000001230000-0x0000000001245000-memory.dmp
            Filesize

            84KB

          • memory/4956-20-0x0000000002E00000-0x000000000300F000-memory.dmp
            Filesize

            2.1MB

          • memory/4956-23-0x0000000002E00000-0x000000000300F000-memory.dmp
            Filesize

            2.1MB

          • memory/4956-24-0x00000000013F0000-0x00000000013F6000-memory.dmp
            Filesize

            24KB

          • memory/4956-27-0x00000000025E0000-0x00000000025F0000-memory.dmp
            Filesize

            64KB

          • memory/4956-30-0x00000000025E0000-0x00000000025F0000-memory.dmp
            Filesize

            64KB

          • memory/4956-31-0x00000000025E0000-0x00000000025F0000-memory.dmp
            Filesize

            64KB

          • memory/4956-13-0x0000000001230000-0x0000000001245000-memory.dmp
            Filesize

            84KB

          • memory/4956-33-0x00000000025E0000-0x00000000025F0000-memory.dmp
            Filesize

            64KB

          • memory/4956-34-0x00000000025E0000-0x00000000025F0000-memory.dmp
            Filesize

            64KB

          • memory/4956-35-0x00000000025E0000-0x00000000025F0000-memory.dmp
            Filesize

            64KB

          • memory/4956-36-0x00000000025E0000-0x00000000025F0000-memory.dmp
            Filesize

            64KB

          • memory/4956-37-0x00000000025E0000-0x00000000025F0000-memory.dmp
            Filesize

            64KB

          • memory/4956-16-0x0000000001230000-0x0000000001245000-memory.dmp
            Filesize

            84KB

          • memory/4956-39-0x00000000025E0000-0x00000000025F0000-memory.dmp
            Filesize

            64KB

          • memory/4956-40-0x00000000025E0000-0x00000000025F0000-memory.dmp
            Filesize

            64KB

          • memory/4956-41-0x00000000025E0000-0x00000000025F0000-memory.dmp
            Filesize

            64KB

          • memory/4956-42-0x00000000025E0000-0x00000000025F0000-memory.dmp
            Filesize

            64KB

          • memory/4956-43-0x00000000025E0000-0x00000000025F0000-memory.dmp
            Filesize

            64KB

          • memory/4956-44-0x00000000025E0000-0x00000000025F0000-memory.dmp
            Filesize

            64KB

          • memory/4956-45-0x00000000025E0000-0x00000000025F0000-memory.dmp
            Filesize

            64KB

          • memory/4956-46-0x00000000025E0000-0x00000000025F0000-memory.dmp
            Filesize

            64KB

          • memory/4956-47-0x00000000025F0000-0x00000000025F5000-memory.dmp
            Filesize

            20KB

          • memory/4956-50-0x00000000025F0000-0x00000000025F5000-memory.dmp
            Filesize

            20KB

          • memory/4956-51-0x0000000007E00000-0x000000000820B000-memory.dmp
            Filesize

            4.0MB

          • memory/4956-54-0x0000000007E00000-0x000000000820B000-memory.dmp
            Filesize

            4.0MB

          • memory/4956-55-0x00000000033D0000-0x00000000033D7000-memory.dmp
            Filesize

            28KB

          • memory/4956-59-0x0000000001230000-0x0000000001245000-memory.dmp
            Filesize

            84KB