Malware Analysis Report

2024-11-15 08:26

Sample ID 241104-tx31natcnk
Target linux_mipsel_softfloat.elf
SHA256 b0d15ae15ddea91eba49906e03e65787613fcad8b190190dfde9f3cf62ee2be3
Tags
kaiji defense_evasion discovery persistence privilege_escalation
score
10/10

Table of Contents

Analysis Overview

MITRE ATT&CK

Enterprise Matrix V15

Analysis: static1

Detonation Overview

Signatures

Analysis: behavioral1

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis Overview

score
10/10

SHA256

b0d15ae15ddea91eba49906e03e65787613fcad8b190190dfde9f3cf62ee2be3

Threat Level: Known bad

The file linux_mipsel_softfloat.elf was found to be: Known bad.

Malicious Activity Summary

kaiji defense_evasion discovery persistence privilege_escalation

Kaiji family

Kaiji

kaiji_chaosbot

Modifies Watchdog functionality

Executes dropped EXE

Enumerates running processes

Modifies init.d

Modifies systemd

Reads CPU attributes

Reads runtime system information

Enumerates kernel/hardware configuration

System Network Configuration Discovery

GoLang User-Agent

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-11-04 16:27

Signatures

Kaiji

Description Indicator Process Target
N/A N/A N/A N/A

Kaiji family

kaiji

kaiji_chaosbot

Description Indicator Process Target
N/A N/A N/A N/A

Analysis: behavioral1

Detonation Overview

Submitted

2024-11-04 16:27

Reported

2024-11-04 16:29

Platform

debian12-mipsel-20240729-en

Max time kernel

153s

Max time network

160s

Command Line

[/tmp/linux_mipsel_softfloat.elf]

Signatures

Executes dropped EXE

Description Indicator Process Target
N/A /etc/32678 /etc/32678 N/A
N/A /etc/id.services.conf /etc/id.services.conf N/A
N/A /etc/id.services.conf /etc/id.services.conf N/A
N/A /etc/32678 /etc/32678 N/A

Modifies Watchdog functionality

defense_evasion
Description Indicator Process Target
File opened for modification /dev/watchdog /tmp/linux_mipsel_softfloat.elf N/A
File opened for modification /dev/misc/watchdog /tmp/linux_mipsel_softfloat.elf N/A

Enumerates running processes

Modifies init.d

persistence
Description Indicator Process Target
File opened for modification /etc/init.d/linux_kill /tmp/linux_mipsel_softfloat.elf N/A

Modifies systemd

persistence privilege_escalation
Description Indicator Process Target
File opened for modification /usr/lib/systemd/system/linux.service /tmp/linux_mipsel_softfloat.elf N/A

Reads CPU attributes

discovery
Description Indicator Process Target
File opened for reading /sys/devices/system/cpu/possible /usr/bin/pkill N/A

Enumerates kernel/hardware configuration

discovery
Description Indicator Process Target
File opened for reading /sys/kernel/mm/transparent_hugepage/hpage_pmd_size /etc/id.services.conf N/A
File opened for reading /sys/kernel/mm/transparent_hugepage/hpage_pmd_size /tmp/linux_mipsel_softfloat.elf N/A
File opened for reading /sys/kernel/mm/transparent_hugepage/hpage_pmd_size /tmp/linux_mipsel_softfloat.elf N/A
File opened for reading /sys/kernel/mm/transparent_hugepage/hpage_pmd_size /etc/id.services.conf N/A
File opened for reading /sys/devices/system/node /usr/bin/pkill N/A

Reads runtime system information

discovery
Description Indicator Process Target
File opened for reading /proc/839/stat /tmp/linux_mipsel_softfloat.elf N/A
File opened for reading /proc/5/status /usr/bin/pkill N/A
File opened for reading /proc/6/status /usr/bin/pkill N/A
File opened for reading /proc/31/stat /usr/bin/pkill N/A
File opened for reading /proc/115/stat /usr/bin/pkill N/A
File opened for reading /proc/384/cmdline /usr/bin/pkill N/A
File opened for reading /proc/823/stat /tmp/linux_mipsel_softfloat.elf N/A
File opened for reading /proc/830/stat /tmp/linux_mipsel_softfloat.elf N/A
File opened for reading /proc/44/ctty /usr/bin/pkill N/A
File opened for reading /proc/367/cgroup /usr/bin/pkill N/A
File opened for reading /proc/872/ctty /usr/bin/pkill N/A
File opened for reading /proc/779/stat /tmp/linux_mipsel_softfloat.elf N/A
File opened for reading /proc/30/status /usr/bin/pkill N/A
File opened for reading /proc/138/cgroup /usr/bin/pkill N/A
File opened for reading /proc/868/cgroup /usr/bin/pkill N/A
File opened for reading /proc/803/stat /tmp/linux_mipsel_softfloat.elf N/A
File opened for reading /proc/113/cmdline /usr/bin/pkill N/A
File opened for reading /proc/sys/kernel/cap_last_cap /usr/sbin/ausearch N/A
File opened for reading /proc/53/status /usr/bin/pkill N/A
File opened for reading /proc/19/cmdline /usr/bin/pkill N/A
File opened for reading /proc/23/ctty /usr/bin/pkill N/A
File opened for reading /proc/119/status /usr/bin/pkill N/A
File opened for reading /proc/119/cmdline /usr/bin/pkill N/A
File opened for reading /proc/sys/kernel/cap_last_cap /usr/bin/journalctl N/A
File opened for reading /proc/384/stat /tmp/linux_mipsel_softfloat.elf N/A
File opened for reading /proc/10/ctty /usr/bin/pkill N/A
File opened for reading /proc/11/cgroup /usr/bin/pkill N/A
File opened for reading /proc/20/stat /usr/bin/pkill N/A
File opened for reading /proc/24/cmdline /usr/bin/pkill N/A
File opened for reading /proc/59/ctty /usr/bin/pkill N/A
File opened for reading /proc/9/cgroup /usr/bin/pkill N/A
File opened for reading /proc/6/stat /usr/bin/pkill N/A
File opened for reading /proc/27/cmdline /usr/bin/pkill N/A
File opened for reading /proc/677/cgroup /usr/bin/pkill N/A
File opened for reading /proc/1/cgroup /usr/bin/pkill N/A
File opened for reading /proc/1/cmdline /usr/bin/pkill N/A
File opened for reading /proc/23/status /usr/bin/pkill N/A
File opened for reading /proc/117/cgroup /usr/bin/pkill N/A
File opened for reading /proc/391/cmdline /usr/bin/pkill N/A
File opened for reading /proc/392/stat /tmp/linux_mipsel_softfloat.elf N/A
File opened for reading /proc/4/ctty /usr/bin/pkill N/A
File opened for reading /proc/14/ctty /usr/bin/pkill N/A
File opened for reading /proc/681/stat /tmp/linux_mipsel_softfloat.elf N/A
File opened for reading /proc/19/ctty /usr/bin/pkill N/A
File opened for reading /proc/30/ctty /usr/bin/pkill N/A
File opened for reading /proc/9/cmdline /usr/bin/pkill N/A
File opened for reading /proc/48/cgroup /usr/bin/pkill N/A
File opened for reading /proc/58/stat /usr/bin/pkill N/A
File opened for reading /proc/10/status /usr/bin/pkill N/A
File opened for reading /proc/33/cgroup /usr/bin/pkill N/A
File opened for reading /proc/682/ctty /usr/bin/pkill N/A
File opened for reading /proc/6/cgroup /usr/bin/pkill N/A
File opened for reading /proc/115/cmdline /usr/bin/pkill N/A
File opened for reading /proc/204/status /usr/bin/pkill N/A
File opened for reading /proc/852/cmdline /usr/bin/pkill N/A
File opened for reading /proc/9/ctty /usr/bin/pkill N/A
File opened for reading /proc/368/cgroup /usr/bin/pkill N/A
File opened for reading /proc/699/cgroup /usr/bin/pkill N/A
File opened for reading /proc/59/cmdline /usr/bin/pkill N/A
File opened for reading /proc/48/stat /usr/bin/pkill N/A
File opened for reading /proc/412/stat /usr/bin/pkill N/A
File opened for reading /proc/884/stat /tmp/linux_mipsel_softfloat.elf N/A
File opened for reading /proc/838/stat /tmp/linux_mipsel_softfloat.elf N/A
File opened for reading /proc/47/status /usr/bin/pkill N/A

System Network Configuration Discovery

discovery
Description Indicator Process Target
N/A N/A /tmp/linux_mipsel_softfloat.elf N/A
N/A N/A /tmp/linux_mipsel_softfloat.elf N/A

GoLang User-Agent

Description Indicator Process Target
HTTP User-Agent header Go-http-client/1.1 N/A N/A

Processes

/tmp/linux_mipsel_softfloat.elf

[/tmp/linux_mipsel_softfloat.elf]

/usr/bin/sh

[sh -c /etc/32678&]

/usr/sbin/service

[service crond start]

/tmp/linux_mipsel_softfloat.elf

[/tmp/linux_mipsel_softfloat.elf ]

/etc/32678

[/etc/32678]

/usr/bin/basename

[basename /usr/sbin/service]

/usr/bin/basename

[basename /usr/sbin/service]

/usr/bin/sleep

[sleep 60]

/usr/bin/systemctl

[systemctl list-unit-files --full --type=socket]

/usr/bin/sed

[sed -ne s/\.socket\s*[a-z]*\s*$/.socket/p]

/usr/sbin/update-rc.d

[update-rc.d linux_kill defaults]

/usr/local/sbin/systemctl

[systemctl daemon-reload]

/usr/local/bin/systemctl

[systemctl daemon-reload]

/usr/sbin/systemctl

[systemctl daemon-reload]

/usr/bin/systemctl

[systemctl daemon-reload]

/usr/local/sbin/systemctl

[systemctl start crond.service]

/usr/local/bin/systemctl

[systemctl start crond.service]

/usr/sbin/systemctl

[systemctl start crond.service]

/usr/bin/systemctl

[systemctl start crond.service]

/usr/bin/sh

[sh -c cd /boot;systemctl daemon-reload;systemctl enable linux.service;systemctl start linux.service;journalctl -xe --no-pager]

/usr/bin/systemctl

[systemctl daemon-reload]

/usr/bin/systemctl

[systemctl enable linux.service]

/etc/id.services.conf

[/etc/id.services.conf]

/usr/bin/pkill

[pkill -9 32678]

/usr/bin/sh

[sh -c /etc/32678&]

/usr/sbin/service

[service crond start]

/etc/id.services.conf

[/etc/id.services.conf ]

/etc/32678

[/etc/32678]

/usr/bin/basename

[basename /usr/sbin/service]

/usr/bin/sleep

[sleep 60]

/usr/bin/basename

[basename /usr/sbin/service]

/usr/bin/systemctl

[systemctl list-unit-files --full --type=socket]

/usr/bin/sed

[sed -ne s/\.socket\s*[a-z]*\s*$/.socket/p]

/usr/bin/systemctl

[systemctl start linux.service]

/usr/local/sbin/systemctl

[systemctl start crond.service]

/usr/local/bin/systemctl

[systemctl start crond.service]

/usr/sbin/systemctl

[systemctl start crond.service]

/usr/bin/systemctl

[systemctl start crond.service]

/usr/bin/journalctl

[journalctl -xe --no-pager]

/usr/bin/sh

[sh -c cd /boot;ausearch -c 'System.img.conf' --raw | audit2allow -M my-Systemimgconf;semodule -X 300 -i my-Systemimgconf.pp]

/usr/bin/audit2allow

[audit2allow -M my-Systemimgconf]

/usr/sbin/ausearch

[ausearch -c System.img.conf --raw]

Network

Country Destination Domain Proto
US 1.1.1.1:53 www.google.com udp
US 1.1.1.1:53 www.google.com udp
US 1.1.1.1:53 78789.dns.army udp
US 1.1.1.1:53 78789.dns.army udp
HK 154.12.82.11:7850 78789.dns.army tcp
US 1.1.1.1:53 debian12-mipsel-20240729-en-8 udp
US 1.1.1.1:53 debian12-mipsel-20240729-en-8 udp
US 1.1.1.1:53 debian12-mipsel-20240729-en-8 udp
US 1.1.1.1:53 debian12-mipsel-20240729-en-8 udp
HK 154.12.82.11:808 78789.dns.army tcp
N/A 10.127.0.1:22 tcp
N/A 10.127.0.3:22 tcp
N/A 10.127.0.2:22 tcp
N/A 10.127.0.5:22 tcp
N/A 10.127.0.4:22 tcp
N/A 10.127.0.7:22 tcp
N/A 10.127.0.10:22 tcp
N/A 10.127.0.9:22 tcp
N/A 10.127.0.8:22 tcp
N/A 10.127.0.6:22 tcp
N/A 10.127.0.12:22 tcp
N/A 10.127.0.15:22 tcp
N/A 10.127.0.14:22 tcp
N/A 10.127.0.11:22 tcp
N/A 10.127.0.13:22 tcp
N/A 10.127.0.18:22 tcp
N/A 10.127.0.20:22 tcp
N/A 10.127.0.19:22 tcp
N/A 10.127.0.17:22 tcp
N/A 10.127.0.16:22 tcp
N/A 10.127.0.23:22 tcp
N/A 10.127.0.21:22 tcp
N/A 10.127.0.25:22 tcp
N/A 10.127.0.22:22 tcp
N/A 10.127.0.24:22 tcp
N/A 10.127.0.27:22 tcp
N/A 10.127.0.30:22 tcp
N/A 10.127.0.28:22 tcp
N/A 10.127.0.29:22 tcp
N/A 10.127.0.34:22 tcp
N/A 10.127.0.33:22 tcp
N/A 10.127.0.32:22 tcp
N/A 10.127.0.31:22 tcp
N/A 10.127.0.36:22 tcp
N/A 10.127.0.37:22 tcp
N/A 10.127.0.38:22 tcp
N/A 10.127.0.35:22 tcp
N/A 10.127.0.41:22 tcp
N/A 10.127.0.40:22 tcp
N/A 10.127.0.42:22 tcp
N/A 10.127.0.39:22 tcp
N/A 10.127.0.45:22 tcp
N/A 10.127.0.46:22 tcp
N/A 10.127.0.44:22 tcp
N/A 10.127.0.43:22 tcp
N/A 10.127.0.50:22 tcp
N/A 10.127.0.49:22 tcp
N/A 10.127.0.48:22 tcp
N/A 10.127.0.47:22 tcp
N/A 10.127.0.52:22 tcp
N/A 10.127.0.51:22 tcp
N/A 10.127.0.53:22 tcp
N/A 10.127.0.54:22 tcp
N/A 10.127.0.57:22 tcp
N/A 10.127.0.58:22 tcp
N/A 10.127.0.59:22 tcp
N/A 10.127.0.56:22 tcp
N/A 10.127.0.55:22 tcp
N/A 10.127.0.62:22 tcp
N/A 10.127.0.60:22 tcp
N/A 10.127.0.63:22 tcp
N/A 10.127.0.61:22 tcp
N/A 10.127.0.64:22 tcp
N/A 10.127.0.65:22 tcp
N/A 10.127.0.67:22 tcp
N/A 10.127.0.68:22 tcp
N/A 10.127.0.66:22 tcp
N/A 10.127.0.69:22 tcp
N/A 10.127.0.73:22 tcp
N/A 10.127.0.71:22 tcp
N/A 10.127.0.72:22 tcp
N/A 10.127.0.70:22 tcp
N/A 10.127.0.74:22 tcp
N/A 10.127.0.76:22 tcp
N/A 10.127.0.77:22 tcp
N/A 10.127.0.78:22 tcp
N/A 10.127.0.75:22 tcp
N/A 10.127.0.79:22 tcp
N/A 10.127.0.80:22 tcp
N/A 10.127.0.81:22 tcp
N/A 10.127.0.82:22 tcp
N/A 10.127.0.83:22 tcp
N/A 10.127.0.84:22 tcp
N/A 10.127.0.88:22 tcp
N/A 10.127.0.89:22 tcp
N/A 10.127.0.85:22 tcp
N/A 10.127.0.87:22 tcp
N/A 10.127.0.86:22 tcp
N/A 10.127.0.91:22 tcp
N/A 10.127.0.94:22 tcp
N/A 10.127.0.90:22 tcp
N/A 10.127.0.93:22 tcp
N/A 10.127.0.92:22 tcp
N/A 10.127.0.95:22 tcp
N/A 10.127.0.97:22 tcp
N/A 10.127.0.98:22 tcp
N/A 10.127.0.99:22 tcp
N/A 10.127.0.96:22 tcp
N/A 10.127.0.100:22 tcp
N/A 10.127.0.102:22 tcp
N/A 10.127.0.103:22 tcp
N/A 10.127.0.101:22 tcp
N/A 10.127.0.104:22 tcp
N/A 10.127.0.105:22 tcp
N/A 10.127.0.109:22 tcp
N/A 10.127.0.106:22 tcp
N/A 10.127.0.107:22 tcp
N/A 10.127.0.108:22 tcp
N/A 10.127.0.110:22 tcp
N/A 10.127.0.111:22 tcp
N/A 10.127.0.114:22 tcp
N/A 10.127.0.113:22 tcp
N/A 10.127.0.112:22 tcp
N/A 10.127.0.115:22 tcp
N/A 10.127.0.116:22 tcp
N/A 10.127.0.119:22 tcp
N/A 10.127.0.117:22 tcp
N/A 10.127.0.118:22 tcp
N/A 10.127.0.120:22 tcp
N/A 10.127.0.123:22 tcp
N/A 10.127.0.121:22 tcp
N/A 10.127.0.124:22 tcp
N/A 10.127.0.122:22 tcp
N/A 10.127.0.125:22 tcp
N/A 10.127.0.128:22 tcp
N/A 10.127.0.129:22 tcp
N/A 10.127.0.126:22 tcp
N/A 10.127.0.127:22 tcp
N/A 10.127.0.130:22 tcp
N/A 10.127.0.133:22 tcp
N/A 10.127.0.132:22 tcp
N/A 10.127.0.131:22 tcp
N/A 10.127.0.134:22 tcp
N/A 10.127.0.135:22 tcp
N/A 10.127.0.139:22 tcp
N/A 10.127.0.137:22 tcp
N/A 10.127.0.138:22 tcp
N/A 10.127.0.136:22 tcp
N/A 10.127.0.140:22 tcp
N/A 10.127.0.144:22 tcp
N/A 10.127.0.142:22 tcp
N/A 10.127.0.143:22 tcp
N/A 10.127.0.141:22 tcp
N/A 10.127.0.145:22 tcp
N/A 10.127.0.146:22 tcp
N/A 10.127.0.148:22 tcp
N/A 10.127.0.147:22 tcp
N/A 10.127.0.149:22 tcp
N/A 10.127.0.150:22 tcp
N/A 10.127.0.153:22 tcp
N/A 10.127.0.151:22 tcp
N/A 10.127.0.154:22 tcp
N/A 10.127.0.152:22 tcp
N/A 10.127.0.155:22 tcp
N/A 10.127.0.157:22 tcp
N/A 10.127.0.159:22 tcp
N/A 10.127.0.156:22 tcp
N/A 10.127.0.158:22 tcp
N/A 10.127.0.160:22 tcp
N/A 10.127.0.162:22 tcp
N/A 10.127.0.163:22 tcp
N/A 10.127.0.164:22 tcp
N/A 10.127.0.161:22 tcp
N/A 10.127.0.165:22 tcp
N/A 10.127.0.170:22 tcp
N/A 10.127.0.167:22 tcp
N/A 10.127.0.168:22 tcp
N/A 10.127.0.166:22 tcp
N/A 10.127.0.169:22 tcp
N/A 10.127.0.174:22 tcp
N/A 10.127.0.172:22 tcp
N/A 10.127.0.173:22 tcp
N/A 10.127.0.171:22 tcp
N/A 10.127.0.175:22 tcp
N/A 10.127.0.176:22 tcp
N/A 10.127.0.177:22 tcp
N/A 10.127.0.178:22 tcp
N/A 10.127.0.179:22 tcp
N/A 10.127.0.180:22 tcp
N/A 10.127.0.184:22 tcp
N/A 10.127.0.181:22 tcp

Files

/etc/32678

MD5 768eaf287796da19e1cf5e0b2fb1b161
SHA1 6a1ce2ee5ccc86d1f33806feb14547b35290df2a
SHA256 1d22620dfb2a6715e5d745aed5cf841ede0e75e1747f12b9b925a2d346bc7ecb
SHA512 e6af30c9df4f7f47696069511e64ecbc8e841629d692ee4056503df3533fb7a7a74960698826260355e1dba7b6c562482a27a39bb51a4237473ce4b68472d620

/etc/init.d/linux_kill

MD5 3909975f7cc0d1121c1819b800069f31
SHA1 3e68de708c2e6c40fab6794afdee3104e5590189
SHA256 6876dac71f13a068afb863d257134275f2edba43b2acaf4924fabf97c079070b
SHA512 50600cceeb03b05f45ae61d890caee9f51ff390b6776930866e527e071d65d08241fc66673fd9b99d62fbc77d3c00fc3de4d7378cbc42f5daba5d83072b0906e

/usr/lib/systemd/system/linux.service

MD5 d80ccc7ced99538f22336f2ec0249087
SHA1 be4de9f604e065b53076a3d7ba702fe98c6b8746
SHA256 0dc3e8552c3e6217e0dc7fd440c7ba4c9cd6e676ce2561e4f71949d2783ae968
SHA512 d798e6516571fcd03bdffbd5405f320fb23422ceb563901658efa4101b4568eabc27730f40c0bcf6dde5509f01ba6965dd61f64675dad695924f1dea1746e6de