Analysis

  • max time kernel
    155s
  • max time network
    161s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20230915-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20230915-enlocale:en-usos:windows10-2004-x64system
  • submitted
    30/09/2023, 21:40

General

  • Target

    file.exe

  • Size

    220KB

  • MD5

    d5f08e65353a81b2a5b6b33491e0e770

  • SHA1

    ca93b8791e23ccaf423112150e4e200e205f0b60

  • SHA256

    559d95ba35257617d331197fbe5271f64ba494deb7db518ce01c8f910a6bfab6

  • SHA512

    8a4977afa6d119b37f8ffd36335a5bd97ce0136eca81271f4c1c99c190ef8257f41e660f2e1ad414888d1b5f9693ecd540f75fe569c763f7be7d5d2eece64dcc

  • SSDEEP

    3072:nZ3R9T1FtuCFO4dlCM6lMoUawMNObQa5dShFUWxw55/uRf/g3:JlXIZqlawZF5dbdu5/

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 1 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.

  • 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\file.exe
    "C:\Users\Admin\AppData\Local\Temp\file.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:428
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\cgpmkqnw\
      2⤵
        PID:4864
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\qzfqodv.exe" C:\Windows\SysWOW64\cgpmkqnw\
        2⤵
          PID:1048
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create cgpmkqnw binPath= "C:\Windows\SysWOW64\cgpmkqnw\qzfqodv.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:4572
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description cgpmkqnw "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:2008
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start cgpmkqnw
          2⤵
          • Launches sc.exe
          PID:2940
        • 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:1212
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 428 -s 1040
          2⤵
          • Program crash
          PID:4204
      • C:\Windows\SysWOW64\cgpmkqnw\qzfqodv.exe
        C:\Windows\SysWOW64\cgpmkqnw\qzfqodv.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:940
        • C:\Windows\SysWOW64\svchost.exe
          svchost.exe
          2⤵
          • Sets service image path in registry
          • Drops file in System32 directory
          • Modifies data under HKEY_USERS
          PID:2908
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 940 -s 544
          2⤵
          • Program crash
          PID:4872
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 460 -p 428 -ip 428
        1⤵
          PID:3664
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 468 -p 940 -ip 940
          1⤵
            PID:3840

          Network

          MITRE ATT&CK Enterprise v15

          Replay Monitor

          Loading Replay Monitor...

          Downloads

          • C:\Users\Admin\AppData\Local\Temp\qzfqodv.exe

            Filesize

            11.2MB

            MD5

            fd2e1704364b784400357e6c4426f31a

            SHA1

            26d37cef3507dfe77a9b85e7d5410c55b1247336

            SHA256

            63ef98c3db4a19a13240cec791790576a99424e575e634ddbcc692d931a9d735

            SHA512

            a1612e351e7cebdbed2c65941d69c2a1db3b22bc7167bfbe8c9d979fda97c29ac4bbb1e4503185f45a4586915591a43148878ffbb4384a76c07794d681069dcb

          • C:\Windows\SysWOW64\cgpmkqnw\qzfqodv.exe

            Filesize

            11.2MB

            MD5

            fd2e1704364b784400357e6c4426f31a

            SHA1

            26d37cef3507dfe77a9b85e7d5410c55b1247336

            SHA256

            63ef98c3db4a19a13240cec791790576a99424e575e634ddbcc692d931a9d735

            SHA512

            a1612e351e7cebdbed2c65941d69c2a1db3b22bc7167bfbe8c9d979fda97c29ac4bbb1e4503185f45a4586915591a43148878ffbb4384a76c07794d681069dcb

          • memory/428-1-0x0000000000540000-0x0000000000553000-memory.dmp

            Filesize

            76KB

          • memory/428-2-0x0000000000400000-0x0000000000444000-memory.dmp

            Filesize

            272KB

          • memory/428-7-0x0000000000520000-0x0000000000535000-memory.dmp

            Filesize

            84KB

          • memory/428-6-0x0000000000400000-0x0000000000444000-memory.dmp

            Filesize

            272KB

          • memory/428-8-0x0000000000540000-0x0000000000553000-memory.dmp

            Filesize

            76KB

          • memory/428-0-0x0000000000520000-0x0000000000535000-memory.dmp

            Filesize

            84KB

          • memory/940-16-0x0000000000400000-0x0000000000444000-memory.dmp

            Filesize

            272KB

          • memory/940-9-0x0000000000D30000-0x0000000000D43000-memory.dmp

            Filesize

            76KB

          • memory/940-10-0x0000000000400000-0x0000000000444000-memory.dmp

            Filesize

            272KB

          • memory/2908-31-0x0000000001930000-0x0000000001940000-memory.dmp

            Filesize

            64KB

          • memory/2908-37-0x0000000001930000-0x0000000001940000-memory.dmp

            Filesize

            64KB

          • memory/2908-17-0x0000000000370000-0x0000000000385000-memory.dmp

            Filesize

            84KB

          • memory/2908-19-0x0000000000370000-0x0000000000385000-memory.dmp

            Filesize

            84KB

          • memory/2908-20-0x0000000002200000-0x000000000240F000-memory.dmp

            Filesize

            2.1MB

          • memory/2908-23-0x0000000002200000-0x000000000240F000-memory.dmp

            Filesize

            2.1MB

          • memory/2908-24-0x0000000001920000-0x0000000001926000-memory.dmp

            Filesize

            24KB

          • memory/2908-27-0x0000000001930000-0x0000000001940000-memory.dmp

            Filesize

            64KB

          • memory/2908-30-0x0000000001930000-0x0000000001940000-memory.dmp

            Filesize

            64KB

          • memory/2908-11-0x0000000000370000-0x0000000000385000-memory.dmp

            Filesize

            84KB

          • memory/2908-32-0x0000000001930000-0x0000000001940000-memory.dmp

            Filesize

            64KB

          • memory/2908-33-0x0000000001930000-0x0000000001940000-memory.dmp

            Filesize

            64KB

          • memory/2908-34-0x0000000001930000-0x0000000001940000-memory.dmp

            Filesize

            64KB

          • memory/2908-35-0x0000000001930000-0x0000000001940000-memory.dmp

            Filesize

            64KB

          • memory/2908-36-0x0000000001930000-0x0000000001940000-memory.dmp

            Filesize

            64KB

          • memory/2908-15-0x0000000000370000-0x0000000000385000-memory.dmp

            Filesize

            84KB

          • memory/2908-38-0x0000000001930000-0x0000000001940000-memory.dmp

            Filesize

            64KB

          • memory/2908-39-0x0000000001930000-0x0000000001940000-memory.dmp

            Filesize

            64KB

          • memory/2908-40-0x0000000001930000-0x0000000001940000-memory.dmp

            Filesize

            64KB

          • memory/2908-41-0x0000000001930000-0x0000000001940000-memory.dmp

            Filesize

            64KB

          • memory/2908-42-0x0000000001930000-0x0000000001940000-memory.dmp

            Filesize

            64KB

          • memory/2908-43-0x0000000001930000-0x0000000001940000-memory.dmp

            Filesize

            64KB

          • memory/2908-44-0x0000000001930000-0x0000000001940000-memory.dmp

            Filesize

            64KB

          • memory/2908-45-0x0000000001930000-0x0000000001940000-memory.dmp

            Filesize

            64KB

          • memory/2908-46-0x0000000001930000-0x0000000001940000-memory.dmp

            Filesize

            64KB

          • memory/2908-47-0x00000000027D0000-0x00000000027D5000-memory.dmp

            Filesize

            20KB

          • memory/2908-50-0x00000000027D0000-0x00000000027D5000-memory.dmp

            Filesize

            20KB

          • memory/2908-51-0x0000000007140000-0x000000000754B000-memory.dmp

            Filesize

            4.0MB

          • memory/2908-54-0x0000000007140000-0x000000000754B000-memory.dmp

            Filesize

            4.0MB

          • memory/2908-55-0x00000000027E0000-0x00000000027E7000-memory.dmp

            Filesize

            28KB