Analysis

  • max time kernel
    146s
  • max time network
    153s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240508-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240508-enlocale:en-usos:windows10-2004-x64system
  • submitted
    11-05-2024 08:17

General

  • Target

    dca04b076eeee5ac2dd81bd4e3f7c84aa0edbbbf322ab6b439e032de8c80da16.exe

  • Size

    10.3MB

  • MD5

    b96ffab0c7c58d79f2742801680212b6

  • SHA1

    41ca4ba9c493524125122672822f5d41b2cffcd3

  • SHA256

    dca04b076eeee5ac2dd81bd4e3f7c84aa0edbbbf322ab6b439e032de8c80da16

  • SHA512

    92df028c8e10ce12f621eb28e2b189b37dc9c097bbb087195a8c3e1d15e0283bde026215c0172dccb9a8d5ddc14e1b761a08d632c8ef7ee67112f976ba55784e

  • SSDEEP

    3072:CcSalqHSwBWbacDEgFAdpW1Z8AZLJDAM/a9s/a9s/a9s/a9s/a9s/a9s/a9s/a9F:0aYlWeeEucpCZZZq

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).

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

Processes

  • C:\Users\Admin\AppData\Local\Temp\dca04b076eeee5ac2dd81bd4e3f7c84aa0edbbbf322ab6b439e032de8c80da16.exe
    "C:\Users\Admin\AppData\Local\Temp\dca04b076eeee5ac2dd81bd4e3f7c84aa0edbbbf322ab6b439e032de8c80da16.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:3924
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\hijasggx\
      2⤵
        PID:4752
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\brncxpnv.exe" C:\Windows\SysWOW64\hijasggx\
        2⤵
          PID:3356
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create hijasggx binPath= "C:\Windows\SysWOW64\hijasggx\brncxpnv.exe /d\"C:\Users\Admin\AppData\Local\Temp\dca04b076eeee5ac2dd81bd4e3f7c84aa0edbbbf322ab6b439e032de8c80da16.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:4552
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description hijasggx "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:1228
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start hijasggx
          2⤵
          • Launches sc.exe
          PID:2888
        • 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:2292
      • C:\Windows\SysWOW64\hijasggx\brncxpnv.exe
        C:\Windows\SysWOW64\hijasggx\brncxpnv.exe /d"C:\Users\Admin\AppData\Local\Temp\dca04b076eeee5ac2dd81bd4e3f7c84aa0edbbbf322ab6b439e032de8c80da16.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:5092
        • 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:1716

      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\brncxpnv.exe
        Filesize

        14.5MB

        MD5

        f701c545c1ca249e52c10309f3b3d9c9

        SHA1

        d88b66a0ff89ebe5381228ceb45307d90236b9cc

        SHA256

        52883f50a341d993b881a2f4aafc50f7f94a139a2708f0b0d3c9a7cb621fbbb1

        SHA512

        672112c0e12a4cd6e40ed1102ea94492d06c7849958f568840749661b8c8fa1202c68c161ae06db1f18ef0c6cbdee7f9a30fbfcab68e921ec89a84fda7877e84

      • memory/1716-43-0x00000000019E0000-0x00000000019E5000-memory.dmp
        Filesize

        20KB

      • memory/1716-35-0x0000000001910000-0x0000000001920000-memory.dmp
        Filesize

        64KB

      • memory/1716-51-0x00000000019F0000-0x00000000019F7000-memory.dmp
        Filesize

        28KB

      • memory/1716-46-0x00000000019E0000-0x00000000019E5000-memory.dmp
        Filesize

        20KB

      • memory/1716-27-0x0000000001910000-0x0000000001920000-memory.dmp
        Filesize

        64KB

      • memory/1716-42-0x0000000001910000-0x0000000001920000-memory.dmp
        Filesize

        64KB

      • memory/1716-13-0x0000000000340000-0x0000000000355000-memory.dmp
        Filesize

        84KB

      • memory/1716-28-0x0000000001910000-0x0000000001920000-memory.dmp
        Filesize

        64KB

      • memory/1716-14-0x0000000000340000-0x0000000000355000-memory.dmp
        Filesize

        84KB

      • memory/1716-16-0x0000000002200000-0x000000000240F000-memory.dmp
        Filesize

        2.1MB

      • memory/1716-23-0x0000000001910000-0x0000000001920000-memory.dmp
        Filesize

        64KB

      • memory/1716-20-0x0000000000EC0000-0x0000000000EC6000-memory.dmp
        Filesize

        24KB

      • memory/1716-19-0x0000000002200000-0x000000000240F000-memory.dmp
        Filesize

        2.1MB

      • memory/1716-30-0x0000000001910000-0x0000000001920000-memory.dmp
        Filesize

        64KB

      • memory/1716-50-0x0000000007140000-0x000000000754B000-memory.dmp
        Filesize

        4.0MB

      • memory/1716-47-0x0000000007140000-0x000000000754B000-memory.dmp
        Filesize

        4.0MB

      • memory/1716-26-0x0000000001910000-0x0000000001920000-memory.dmp
        Filesize

        64KB

      • memory/1716-29-0x0000000001910000-0x0000000001920000-memory.dmp
        Filesize

        64KB

      • memory/1716-10-0x0000000000340000-0x0000000000355000-memory.dmp
        Filesize

        84KB

      • memory/1716-41-0x0000000001910000-0x0000000001920000-memory.dmp
        Filesize

        64KB

      • memory/1716-40-0x0000000001910000-0x0000000001920000-memory.dmp
        Filesize

        64KB

      • memory/1716-39-0x0000000001910000-0x0000000001920000-memory.dmp
        Filesize

        64KB

      • memory/1716-38-0x0000000001910000-0x0000000001920000-memory.dmp
        Filesize

        64KB

      • memory/1716-37-0x0000000001910000-0x0000000001920000-memory.dmp
        Filesize

        64KB

      • memory/1716-36-0x0000000001910000-0x0000000001920000-memory.dmp
        Filesize

        64KB

      • memory/1716-31-0x0000000001910000-0x0000000001920000-memory.dmp
        Filesize

        64KB

      • memory/1716-34-0x0000000001910000-0x0000000001920000-memory.dmp
        Filesize

        64KB

      • memory/1716-33-0x0000000001910000-0x0000000001920000-memory.dmp
        Filesize

        64KB

      • memory/1716-32-0x0000000001910000-0x0000000001920000-memory.dmp
        Filesize

        64KB

      • memory/3924-2-0x00000000024F0000-0x0000000002503000-memory.dmp
        Filesize

        76KB

      • memory/3924-8-0x0000000000400000-0x0000000000415000-memory.dmp
        Filesize

        84KB

      • memory/3924-7-0x0000000000400000-0x0000000002284000-memory.dmp
        Filesize

        30.5MB

      • memory/3924-1-0x0000000002560000-0x0000000002660000-memory.dmp
        Filesize

        1024KB

      • memory/3924-3-0x0000000000400000-0x0000000000415000-memory.dmp
        Filesize

        84KB

      • memory/5092-11-0x0000000000400000-0x0000000002284000-memory.dmp
        Filesize

        30.5MB