diff --git a/README.md b/README.md
index 21491d2..4e4df31 100644
--- a/README.md
+++ b/README.md
@@ -37,4 +37,6 @@ Chall:
    --> 30702
    
 8. service_agent
-   --> 30802
\ No newline at end of file
+   --> 30802
+9. kesek-kesek
+   --> 30902
diff --git a/kesek-kesek/Dockerfile b/kesek-kesek/Dockerfile
new file mode 100644
index 0000000..26bd7c6
--- /dev/null
+++ b/kesek-kesek/Dockerfile
@@ -0,0 +1,38 @@
+# Use ubuntu 16.04
+FROM ubuntu:16.04
+
+#RUN apt-get update && apt-get -y dist-upgrade --fix-missing --fix-broken
+#RUN apt-get update
+#RUN apt-get update && apt-get install -y apt-transport-https
+#RUN echo 'deb http://private-repo-1.hortonworks.com/HDP/ubuntu14/2.x/updates/2.4.2.0 HDP main' >> /etc/apt/sources.list.d/HDP.list
+#RUN echo 'deb http://private-repo-1.hortonworks.com/HDP-UTILS-1.1.0.20/repos/ubuntu14 HDP-UTILS main' >> /etc/apt/sources.list.d/HDP.list
+#RUN echo 'deb [arch=amd64] https://apt-mo.trafficmanager.net/repos/azurecore/ trusty main' >> /etc/apt/sources.list.d/azure-public-trusty.list
+
+# install socat editor ssh
+#RUN apt-get install curl netcat-openbsd vim nano openssh-server socat lib32ncurses5 python python-pip python-dev -y
+#RUN apt-get install socat lib32ncurses5 -y
+RUN apt-get update && apt-get install curl netcat-openbsd vim nano openssh-server socat lib32ncurses5 python python-pip python-dev -y
+
+RUN adduser --disabled-password --gecos "" ksl
+RUN echo "ksl:sebuahrahasiamas" | chpasswd
+
+ADD chall/. /chall
+WORKDIR /chall
+
+RUN echo 'KSL{Upps_Yo0_Th3_R3AA#$L_FuCkB0y}'  > /chall/flag.txt # ubah isi flagnya
+
+# Secure ENV
+
+RUN echo 'alias kill="echo no kill please!"' >> ~/.bashrc
+RUN chmod 700 /tmp /var/tmp /usr/bin/* /bin/* /dev/shm
+RUN chmod 755 /usr/bin/env /bin/dash /bin/bash /bin/sh /bin/nc /bin/cat /usr/bin/curl /usr/bin/groups /usr/bin/id /bin/ls /usr/bin/python
+
+
+RUN chown root:ksl /chall/membuat # ubah nama file
+RUN chmod 775 /chall/membuat # ubah nama file
+
+# Run Service
+
+RUN echo '#!/bin/bash'"\n(socat TCP-LISTEN:7000,reuseaddr,fork EXEC:"/chall/membuat,su=nobody")" > /var/tmp/.start.sh && chmod +x /var/tmp/.start.sh
+
+CMD ["/var/tmp/.start.sh"]
diff --git a/kesek-kesek/chall/membuat b/kesek-kesek/chall/membuat
new file mode 100755
index 0000000..32c74ee
Binary files /dev/null and b/kesek-kesek/chall/membuat differ
diff --git a/kesek-kesek/membuat.c b/kesek-kesek/membuat.c
new file mode 100644
index 0000000..845af8b
--- /dev/null
+++ b/kesek-kesek/membuat.c
@@ -0,0 +1,17 @@
+#include <stdlib.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <string.h>
+
+int main(int argc, char **argv)
+{
+  char buffer[64];
+  char vuln[64];
+  printf("masukan nama anda : ");
+  fflush(stdout); 
+  gets(buffer);
+  printf("selamat datang %s\n",buffer);
+  printf("buffer ada di : %p\n",vuln);
+  fflush(stdout); 
+  gets(vuln);
+}