Analysis

  • max time kernel
    149s
  • max time network
    152s
  • 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 14:54

General

  • Target

    3d24879020f71f37768efb2dcd3724477b190b9f0c7f87c72edb472f81123ec5.exe

  • Size

    238KB

  • MD5

    761915a4ae82207a72f8b60786d00a97

  • SHA1

    0892117051b95db0240247a83d9798c103b05897

  • SHA256

    3d24879020f71f37768efb2dcd3724477b190b9f0c7f87c72edb472f81123ec5

  • SHA512

    6dbb4dbf15d9c9f086394b6a52a2d59736b8454f525bdb39253b1a289f511edcd5fe33c43c1baf0cfa2aba186710d5442d111ce2343a6f2a26c82913c1eb2d4c

  • SSDEEP

    3072:d/PLinbwusnVoPhS6dxuUo6U4Gn0gDbsw6QeKWl+4zQ/ZwBV7VP:d/PLCbxuUYGgDbskkwg

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\3d24879020f71f37768efb2dcd3724477b190b9f0c7f87c72edb472f81123ec5.exe
    "C:\Users\Admin\AppData\Local\Temp\3d24879020f71f37768efb2dcd3724477b190b9f0c7f87c72edb472f81123ec5.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:3968
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\cenygdsv\
      2⤵
        PID:5056
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\kejhcfce.exe" C:\Windows\SysWOW64\cenygdsv\
        2⤵
          PID:3964
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create cenygdsv binPath= "C:\Windows\SysWOW64\cenygdsv\kejhcfce.exe /d\"C:\Users\Admin\AppData\Local\Temp\3d24879020f71f37768efb2dcd3724477b190b9f0c7f87c72edb472f81123ec5.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:1812
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description cenygdsv "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:3556
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start cenygdsv
          2⤵
          • Launches sc.exe
          PID:4764
        • 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:4708
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3968 -s 588
          2⤵
          • Program crash
          PID:3080
      • C:\Windows\SysWOW64\cenygdsv\kejhcfce.exe
        C:\Windows\SysWOW64\cenygdsv\kejhcfce.exe /d"C:\Users\Admin\AppData\Local\Temp\3d24879020f71f37768efb2dcd3724477b190b9f0c7f87c72edb472f81123ec5.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:4552
        • 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:1920
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4552 -s 532
          2⤵
          • Program crash
          PID:1488
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 460 -p 3968 -ip 3968
        1⤵
          PID:4616
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 468 -p 4552 -ip 4552
          1⤵
            PID:4844

          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\kejhcfce.exe
            Filesize

            11.2MB

            MD5

            5c686644a3daf10ff54f07caa10ec5dd

            SHA1

            a11da98e123175de87b0637a3b8964c9a5d4ef44

            SHA256

            e1249b2e8f1a81b159d2ad7618804c527578d5b17e419cdbdd390c101f45d428

            SHA512

            ee4a40d664746f5649a3651b8653d18d7e52501a28c07e6d707679a031fb6201f31eb48a2fca8ff6788605da24649c021009b087a61c3337e5cd32dcbca21d9d

          • memory/1920-33-0x0000000001BC0000-0x0000000001BD0000-memory.dmp
            Filesize

            64KB

          • memory/1920-39-0x0000000001BC0000-0x0000000001BD0000-memory.dmp
            Filesize

            64KB

          • memory/1920-59-0x0000000000700000-0x0000000000715000-memory.dmp
            Filesize

            84KB

          • memory/1920-34-0x0000000001BC0000-0x0000000001BD0000-memory.dmp
            Filesize

            64KB

          • memory/1920-38-0x0000000001BC0000-0x0000000001BD0000-memory.dmp
            Filesize

            64KB

          • memory/1920-55-0x0000000002BD0000-0x0000000002BD7000-memory.dmp
            Filesize

            28KB

          • memory/1920-54-0x0000000007940000-0x0000000007D4B000-memory.dmp
            Filesize

            4.0MB

          • memory/1920-12-0x0000000000700000-0x0000000000715000-memory.dmp
            Filesize

            84KB

          • memory/1920-40-0x0000000001BC0000-0x0000000001BD0000-memory.dmp
            Filesize

            64KB

          • memory/1920-16-0x0000000000700000-0x0000000000715000-memory.dmp
            Filesize

            84KB

          • memory/1920-15-0x0000000000700000-0x0000000000715000-memory.dmp
            Filesize

            84KB

          • memory/1920-18-0x0000000000700000-0x0000000000715000-memory.dmp
            Filesize

            84KB

          • memory/1920-20-0x0000000002400000-0x000000000260F000-memory.dmp
            Filesize

            2.1MB

          • memory/1920-35-0x0000000001BC0000-0x0000000001BD0000-memory.dmp
            Filesize

            64KB

          • memory/1920-27-0x0000000001BC0000-0x0000000001BD0000-memory.dmp
            Filesize

            64KB

          • memory/1920-24-0x0000000001BB0000-0x0000000001BB6000-memory.dmp
            Filesize

            24KB

          • memory/1920-31-0x0000000001BC0000-0x0000000001BD0000-memory.dmp
            Filesize

            64KB

          • memory/1920-30-0x0000000001BC0000-0x0000000001BD0000-memory.dmp
            Filesize

            64KB

          • memory/1920-36-0x0000000001BC0000-0x0000000001BD0000-memory.dmp
            Filesize

            64KB

          • memory/1920-41-0x0000000001BC0000-0x0000000001BD0000-memory.dmp
            Filesize

            64KB

          • memory/1920-23-0x0000000002400000-0x000000000260F000-memory.dmp
            Filesize

            2.1MB

          • memory/1920-32-0x0000000001BC0000-0x0000000001BD0000-memory.dmp
            Filesize

            64KB

          • memory/1920-37-0x0000000001BC0000-0x0000000001BD0000-memory.dmp
            Filesize

            64KB

          • memory/1920-45-0x0000000001BC0000-0x0000000001BD0000-memory.dmp
            Filesize

            64KB

          • memory/1920-44-0x0000000001BC0000-0x0000000001BD0000-memory.dmp
            Filesize

            64KB

          • memory/1920-46-0x0000000001BC0000-0x0000000001BD0000-memory.dmp
            Filesize

            64KB

          • memory/1920-43-0x0000000001BC0000-0x0000000001BD0000-memory.dmp
            Filesize

            64KB

          • memory/1920-50-0x0000000001BF0000-0x0000000001BF5000-memory.dmp
            Filesize

            20KB

          • memory/1920-51-0x0000000007940000-0x0000000007D4B000-memory.dmp
            Filesize

            4.0MB

          • memory/1920-47-0x0000000001BF0000-0x0000000001BF5000-memory.dmp
            Filesize

            20KB

          • memory/1920-42-0x0000000001BC0000-0x0000000001BD0000-memory.dmp
            Filesize

            64KB

          • memory/3968-4-0x0000000000400000-0x000000000085D000-memory.dmp
            Filesize

            4.4MB

          • memory/3968-1-0x0000000000A00000-0x0000000000B00000-memory.dmp
            Filesize

            1024KB

          • memory/3968-9-0x00000000009C0000-0x00000000009D3000-memory.dmp
            Filesize

            76KB

          • memory/3968-8-0x0000000000400000-0x000000000085D000-memory.dmp
            Filesize

            4.4MB

          • memory/3968-2-0x00000000009C0000-0x00000000009D3000-memory.dmp
            Filesize

            76KB

          • memory/4552-17-0x0000000000400000-0x000000000085D000-memory.dmp
            Filesize

            4.4MB

          • memory/4552-11-0x0000000000400000-0x000000000085D000-memory.dmp
            Filesize

            4.4MB

          • memory/4552-10-0x0000000000A40000-0x0000000000B40000-memory.dmp
            Filesize

            1024KB