Analysis

  • max time kernel
    145s
  • max time network
    135s
  • platform
    windows7_x64
  • resource
    win7-20231129-en
  • resource tags

    arch:x64arch:x86image:win7-20231129-enlocale:en-usos:windows7-x64system
  • submitted
    17-04-2024 13:33

General

  • Target

    9f88f8dba6df3a1116c8444e9b03812fcadf4d8bf9f67d6cfcfb42eaae819e70.exe

  • Size

    299KB

  • MD5

    54b34c36efd4417cbcc35e2ac2c3e67c

  • SHA1

    1e8515d94951bdf686fc5e2ab33885fb99efbaeb

  • SHA256

    9f88f8dba6df3a1116c8444e9b03812fcadf4d8bf9f67d6cfcfb42eaae819e70

  • SHA512

    af0134597248b30fd78b3cc7d73760a9aea62d27edcb5be7874373fe8dc04b3e0c6327443fda38ac32a8ba74119cfd7b02b2b711ce3280abbe1335cb6fee62b4

  • SSDEEP

    3072:9LJYk6t5eTZuuC3rYFwHV6nRKgB2k3zjdCZr6TN8TiuFxAXc5OUZdu8HVZO7:9LKlsTa3rYfB24Mr2s4jUTu8HVc7

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.

  • Windows security bypass 2 TTPs 1 IoCs
  • Creates new service(s) 1 TTPs
  • Modifies Windows Firewall 2 TTPs 1 IoCs
  • Sets service image path in registry 2 TTPs 1 IoCs
  • 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).

  • Modifies data under HKEY_USERS 3 IoCs
  • Suspicious use of WriteProcessMemory 30 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\9f88f8dba6df3a1116c8444e9b03812fcadf4d8bf9f67d6cfcfb42eaae819e70.exe
    "C:\Users\Admin\AppData\Local\Temp\9f88f8dba6df3a1116c8444e9b03812fcadf4d8bf9f67d6cfcfb42eaae819e70.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:3028
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\elxczpcz\
      2⤵
        PID:2240
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\mtsfnnvz.exe" C:\Windows\SysWOW64\elxczpcz\
        2⤵
          PID:2556
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create elxczpcz binPath= "C:\Windows\SysWOW64\elxczpcz\mtsfnnvz.exe /d\"C:\Users\Admin\AppData\Local\Temp\9f88f8dba6df3a1116c8444e9b03812fcadf4d8bf9f67d6cfcfb42eaae819e70.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:2580
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description elxczpcz "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:2632
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start elxczpcz
          2⤵
          • Launches sc.exe
          PID:2148
        • 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:1780
      • C:\Windows\SysWOW64\elxczpcz\mtsfnnvz.exe
        C:\Windows\SysWOW64\elxczpcz\mtsfnnvz.exe /d"C:\Users\Admin\AppData\Local\Temp\9f88f8dba6df3a1116c8444e9b03812fcadf4d8bf9f67d6cfcfb42eaae819e70.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:2588
        • C:\Windows\SysWOW64\svchost.exe
          svchost.exe
          2⤵
          • Windows security bypass
          • Sets service image path in registry
          • Deletes itself
          • Drops file in System32 directory
          • Modifies data under HKEY_USERS
          PID:2492

      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

      2
      T1562

      Disable or Modify Tools

      1
      T1562.001

      Disable or Modify System Firewall

      1
      T1562.004

      Modify Registry

      2
      T1112

      Discovery

      System Information Discovery

      1
      T1082

      Replay Monitor

      Loading Replay Monitor...

      Downloads

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

        14.5MB

        MD5

        84ccab1ffe786162d47150a3569bf95a

        SHA1

        34a788ef0e15b4dee11d4294d2235fd14ea5cc3a

        SHA256

        c717b8c8c072fec22f9999418420bfc67ad84dc332e0a7d371c80cbebbbab9fc

        SHA512

        cfa8d2c4f8575a7c854a7e6b5b587cd62c565f3f1368402b3e1e9a863373839cc8a22838e8c679fa080f171dec1dac127ed95a05a23b24bbe3ce7fc9097ff321

      • memory/2492-11-0x000000007EFDE000-0x000000007EFDF000-memory.dmp
        Filesize

        4KB

      • memory/2492-13-0x0000000000080000-0x0000000000095000-memory.dmp
        Filesize

        84KB

      • memory/2492-22-0x0000000000080000-0x0000000000095000-memory.dmp
        Filesize

        84KB

      • memory/2492-20-0x0000000000080000-0x0000000000095000-memory.dmp
        Filesize

        84KB

      • memory/2492-19-0x0000000000080000-0x0000000000095000-memory.dmp
        Filesize

        84KB

      • memory/2492-18-0x0000000000080000-0x0000000000095000-memory.dmp
        Filesize

        84KB

      • memory/2492-10-0x0000000000080000-0x0000000000095000-memory.dmp
        Filesize

        84KB

      • memory/2588-9-0x0000000000400000-0x000000000086C000-memory.dmp
        Filesize

        4.4MB

      • memory/2588-16-0x0000000000400000-0x000000000086C000-memory.dmp
        Filesize

        4.4MB

      • memory/2588-8-0x00000000008E0000-0x00000000009E0000-memory.dmp
        Filesize

        1024KB

      • memory/3028-1-0x0000000000A40000-0x0000000000B40000-memory.dmp
        Filesize

        1024KB

      • memory/3028-17-0x0000000000400000-0x000000000086C000-memory.dmp
        Filesize

        4.4MB

      • memory/3028-4-0x0000000000400000-0x000000000086C000-memory.dmp
        Filesize

        4.4MB

      • memory/3028-3-0x0000000000230000-0x0000000000243000-memory.dmp
        Filesize

        76KB