Stephanie Wehner

Description

Stephanie Dorothea Christine Wehner (born 8 May 1977 in Würzburg) is a German physicist and computer scientist. She is the Roadmap Leader of the Quantum Internet and Networked Computing initiative at QuTech, Delft University of Technology.She is also known for introducing the noisy-storage model in quantum cryptography. Wehner's research focuses mainly on quantum cryptography and quantum communications. - Wikipedia Entry

Chal: We had the flag in notepad but it crashed. Please return the flag to this Quantum Cryptographer

Attachments

Drive Link OR Memory Dump

Solution

  • We are given with a memory dump of a windows machine, a .vmem file.

  • We can use volatility to analyze the memory dump.

  • Using the imageinfo plugin, we can get the profile of the machine.

vol2 -f 564d38b5-422f-6f97-6068-7ea242ed6857.vmem imageinfo
$ vol2 -f 564d38b5-422f-6f97-6068-7ea242ed6857.vmem imageinfo                                               
Volatility Foundation Volatility Framework 2.6
INFO    : volatility.debug    : Determining profile based on KDBG search...
          Suggested Profile(s) : Win8SP0x64, Win81U1x64, Win2012R2x64_18340, Win2012R2x64, Win2012x64, Win8SP1x64_18340, Win8SP1x64 (Instantiated with Win8SP1x64)
                     AS Layer1 : WindowsAMD64PagedMemory (Kernel AS)
                     AS Layer2 : FileAddressSpace (/home/kali/Documents/Personal/CTFs/Files/CyberHeroines-CTF/Stephanie_Wehner/564d38b5-422f-6f97-6068-7ea242ed6857.vmem)
                      PAE type : No PAE
                           DTB : 0x1a7000L
                          KDBG : 0xf8037feaba30L
          Number of Processors : 1
     Image Type (Service Pack) : 0
                KPCR for CPU 0 : 0xfffff8037ff06000L
             KUSER_SHARED_DATA : 0xfffff78000000000L
           Image date and time : 2023-08-03 21:21:54 UTC+0000
     Image local date and time : 2023-08-03 17:21:54 -0400

  • We can see that the profile is Win8SP0x64.

  • We can use the pslist plugin to list all the processes running on the machine.

vol2 -f 564d38b5-422f-6f97-6068-7ea242ed6857.vmem --profile=Win8SP0x64 pslist

  • We can see that the notepad process has the pid 2452.

$ vol2 -f 564d38b5-422f-6f97-6068-7ea242ed6857.vmem --profile=Win8SP0x64 pslist | grep 'notepad'
Volatility Foundation Volatility Framework 2.6
0xffffe000021c3900 notepad.exe            2452   1180      2        0      1      0 2023-08-03 21:20:36 UTC+0000

  • Dump the notepad process using the memdump plugin and the pid of the notepad process.

vol2 -f 564d38b5-422f-6f97-6068-7ea242ed6857.vmem --profile=Win8SP0x64 memdump --pid=2452 --dump-dir=dump

  • Runnings strings

strings -e l 2452.dmp | less

  • Scrolling through the output gives us a github link: https://github.com/FITCF

  • It contains a single repository secret

  • Checking the commits, the first commit has the flag

flag

FLAG

chctf{2023!@mu5f@!5y_1009}

Last updated