Analysis

  • max time kernel
    149s
  • max time network
    150s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240508-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240508-enlocale:en-usos:windows10-2004-x64system
  • submitted
    21-05-2024 05:56

General

  • Target

    b7ab94357342f73380569c9b23bc81741e1784b8a7cfdfe8df680000a1f3da1f.exe

  • Size

    178KB

  • MD5

    a6c7dd82eace106350d20d93956360e6

  • SHA1

    19c5ea0607b527e4c2b08a39583db38f503933e0

  • SHA256

    b7ab94357342f73380569c9b23bc81741e1784b8a7cfdfe8df680000a1f3da1f

  • SHA512

    6e3d950e1a16103710985e9e0993f26ece5f7d67eadbd711941e826117d0d884624ddf166d3a70e25453518bb2f7d9a9c2dede25f6785dcb24d6031ba29c419e

  • SSDEEP

    1536:DAc76NGJEzLoCPMkXzxIGzA9aRmNjo/Phcnr6xMtxUtoIlESP5tA9bDQqpN+X:D7kXzxIGzA9aUo/PhcnVHUtoe5K9

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).

  • Program crash 2 IoCs
  • Modifies data under HKEY_USERS 6 IoCs
  • Suspicious use of WriteProcessMemory 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\b7ab94357342f73380569c9b23bc81741e1784b8a7cfdfe8df680000a1f3da1f.exe
    "C:\Users\Admin\AppData\Local\Temp\b7ab94357342f73380569c9b23bc81741e1784b8a7cfdfe8df680000a1f3da1f.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:2352
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\ohwhupxc\
      2⤵
        PID:3832
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\amydagft.exe" C:\Windows\SysWOW64\ohwhupxc\
        2⤵
          PID:2276
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create ohwhupxc binPath= "C:\Windows\SysWOW64\ohwhupxc\amydagft.exe /d\"C:\Users\Admin\AppData\Local\Temp\b7ab94357342f73380569c9b23bc81741e1784b8a7cfdfe8df680000a1f3da1f.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:3040
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description ohwhupxc "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:3224
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start ohwhupxc
          2⤵
          • Launches sc.exe
          PID:4280
        • 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:2380
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 2352 -s 744
          2⤵
          • Program crash
          PID:2248
      • C:\Windows\SysWOW64\ohwhupxc\amydagft.exe
        C:\Windows\SysWOW64\ohwhupxc\amydagft.exe /d"C:\Users\Admin\AppData\Local\Temp\b7ab94357342f73380569c9b23bc81741e1784b8a7cfdfe8df680000a1f3da1f.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:2740
        • 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:4952
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 2740 -s 560
          2⤵
          • Program crash
          PID:4660
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 456 -p 2740 -ip 2740
        1⤵
          PID:392
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 480 -p 2352 -ip 2352
          1⤵
            PID:4156

          Network

          MITRE ATT&CK Matrix ATT&CK v13

          Execution

          System Services

          1
          T1569

          Service Execution

          1
          T1569.002

          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\amydagft.exe
            Filesize

            14.3MB

            MD5

            4e723ca154bd6c6d649be676927341fc

            SHA1

            f01e4df101488f8b221f8d7a3e75d299fe8b2616

            SHA256

            22c5a67a55a7a9f41bca5f465f093e78537c8e89fd69a91cdf37120ad0703ee3

            SHA512

            2d89ae9ac7865c6e0a3bf10ac9e7771580fb9e021bcd43c9c8f1411712f88ff47057cc9a84b36dc57ee6d9e7bf73a93f87ba402502ba3d7461007997a347e08a

          • memory/2352-13-0x0000000000400000-0x0000000000415000-memory.dmp
            Filesize

            84KB

          • memory/2352-1-0x00000000025B0000-0x00000000026B0000-memory.dmp
            Filesize

            1024KB

          • memory/2352-4-0x0000000000400000-0x0000000000415000-memory.dmp
            Filesize

            84KB

          • memory/2352-2-0x00000000024A0000-0x00000000024B3000-memory.dmp
            Filesize

            76KB

          • memory/2352-12-0x00000000024A0000-0x00000000024B3000-memory.dmp
            Filesize

            76KB

          • memory/2352-11-0x0000000000400000-0x0000000002349000-memory.dmp
            Filesize

            31.3MB

          • memory/2740-10-0x0000000000400000-0x0000000002349000-memory.dmp
            Filesize

            31.3MB

          • memory/4952-48-0x0000000007E80000-0x000000000828B000-memory.dmp
            Filesize

            4.0MB

          • memory/4952-41-0x0000000002760000-0x0000000002770000-memory.dmp
            Filesize

            64KB

          • memory/4952-15-0x00000000012A0000-0x00000000012B5000-memory.dmp
            Filesize

            84KB

          • memory/4952-34-0x0000000002760000-0x0000000002770000-memory.dmp
            Filesize

            64KB

          • memory/4952-18-0x0000000003000000-0x000000000320F000-memory.dmp
            Filesize

            2.1MB

          • memory/4952-24-0x0000000002760000-0x0000000002770000-memory.dmp
            Filesize

            64KB

          • memory/4952-21-0x0000000002750000-0x0000000002756000-memory.dmp
            Filesize

            24KB

          • memory/4952-20-0x0000000003000000-0x000000000320F000-memory.dmp
            Filesize

            2.1MB

          • memory/4952-51-0x0000000007E80000-0x000000000828B000-memory.dmp
            Filesize

            4.0MB

          • memory/4952-52-0x00000000033D0000-0x00000000033D7000-memory.dmp
            Filesize

            28KB

          • memory/4952-8-0x00000000012A0000-0x00000000012B5000-memory.dmp
            Filesize

            84KB

          • memory/4952-47-0x00000000027F0000-0x00000000027F5000-memory.dmp
            Filesize

            20KB

          • memory/4952-44-0x00000000027F0000-0x00000000027F5000-memory.dmp
            Filesize

            20KB

          • memory/4952-43-0x0000000002760000-0x0000000002770000-memory.dmp
            Filesize

            64KB

          • memory/4952-42-0x0000000002760000-0x0000000002770000-memory.dmp
            Filesize

            64KB

          • memory/4952-14-0x00000000012A0000-0x00000000012B5000-memory.dmp
            Filesize

            84KB

          • memory/4952-40-0x0000000002760000-0x0000000002770000-memory.dmp
            Filesize

            64KB

          • memory/4952-39-0x0000000002760000-0x0000000002770000-memory.dmp
            Filesize

            64KB

          • memory/4952-38-0x0000000002760000-0x0000000002770000-memory.dmp
            Filesize

            64KB

          • memory/4952-37-0x0000000002760000-0x0000000002770000-memory.dmp
            Filesize

            64KB

          • memory/4952-36-0x0000000002760000-0x0000000002770000-memory.dmp
            Filesize

            64KB

          • memory/4952-35-0x0000000002760000-0x0000000002770000-memory.dmp
            Filesize

            64KB

          • memory/4952-33-0x0000000002760000-0x0000000002770000-memory.dmp
            Filesize

            64KB

          • memory/4952-32-0x0000000002760000-0x0000000002770000-memory.dmp
            Filesize

            64KB

          • memory/4952-31-0x0000000002760000-0x0000000002770000-memory.dmp
            Filesize

            64KB

          • memory/4952-30-0x0000000002760000-0x0000000002770000-memory.dmp
            Filesize

            64KB

          • memory/4952-29-0x0000000002760000-0x0000000002770000-memory.dmp
            Filesize

            64KB

          • memory/4952-28-0x0000000002760000-0x0000000002770000-memory.dmp
            Filesize

            64KB

          • memory/4952-27-0x0000000002760000-0x0000000002770000-memory.dmp
            Filesize

            64KB