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Analysis
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max time kernel
149s -
max time network
148s -
platform
ubuntu-22.04_amd64 -
resource
ubuntu2204-amd64-20240729-en -
resource tags
arch:amd64arch:i386image:ubuntu2204-amd64-20240729-enkernel:5.15.0-105-genericlocale:en-usos:ubuntu-22.04-amd64system -
submitted
25/11/2024, 22:46
Behavioral task
behavioral1
Sample
linux_386.elf
Resource
ubuntu2204-amd64-20240729-en
General
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Target
linux_386.elf
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Size
5.0MB
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MD5
f5c59e70b89c03eb69f02a7be662ed59
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SHA1
f1dc3d2d6c85692a2419517d3473bb370cf86510
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SHA256
ae49891720a4fa75f48a58efd4fc5dcd369f8c99add24e781191616f46149457
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SHA512
69a1fcdc968d5b2f2706a0c6294974d2cc211910033e8bd991ec9dad01eacf93b20dfb3c72f17130b29b53a8b1add45f04a6c1c7e1f81ff9f198184493354225
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SSDEEP
49152:E33d0lGt6UHcFL7Rn2o03wiEhiDmzzd/9sARlBs/00Cpfx9a9uNFp9hW16klbU6V:E33GlbU8FwmzzRDZ9mWqRV
Malware Config
Extracted
kaiji
aras.liveya.org:52462
Signatures
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Kaiji 1 IoCs
Kaiji payload
resource yara_rule behavioral1/files/fstream-6.dat Kaiji -
Kaiji family
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kaiji_chaosbot 1 IoCs
Chaos-variant payload
resource yara_rule behavioral1/files/fstream-6.dat kaiji_chaosbot -
Executes dropped EXE 1 IoCs
ioc pid Process /etc/32678 1568 32678 -
Modifies Watchdog functionality 1 TTPs 2 IoCs
Malware like Mirai modifies the Watchdog to prevent it restarting an infected system.
description ioc Process File opened for modification /dev/watchdog linux_386.elf File opened for modification /dev/misc/watchdog linux_386.elf -
Creates/modifies Cron job 1 TTPs 1 IoCs
Cron allows running tasks on a schedule, and is commonly used for malware persistence.
description ioc Process File opened for modification /etc/crontab bash -
Creates/modifies environment variables 1 TTPs 3 IoCs
Creating/modifying environment variables is a common persistence mechanism.
description ioc Process File opened for modification /etc/profile.d/bash_config.sh linux_386.elf File opened for modification /etc/profile.d/bash_config linux_386.elf File opened for modification /etc/profile.d/linux.sh linux_386.elf -
Enumerates running processes
Discovers information about currently running processes on the system
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description ioc Process File opened for modification /etc/init.d/linux_kill linux_386.elf File opened for modification /etc/init.d/ssh linux_386.elf -
Modifies systemd 2 TTPs 1 IoCs
Adds/ modifies systemd service files. Likely to achieve persistence.
description ioc Process File opened for modification /usr/lib/systemd/system/linux.service linux_386.elf -
Write file to user bin folder 6 IoCs
description ioc Process File opened for modification /usr/bin/ps linux_386.elf File opened for modification /usr/bin/ss linux_386.elf File opened for modification /usr/bin/ls linux_386.elf File opened for modification /usr/bin/dir linux_386.elf File opened for modification /usr/bin/find linux_386.elf File opened for modification /usr/bin/lsof linux_386.elf -
Modifies Bash startup script 2 TTPs 3 IoCs
description ioc Process File opened for modification /etc/profile.d/bash_config.sh linux_386.elf File opened for modification /etc/profile.d/bash_config linux_386.elf File opened for modification /etc/profile.d/linux.sh linux_386.elf -
Changes its process name 1 IoCs
description ioc pid Process Changes the process name, possibly in an attempt to hide itself ksoftirqd/0 1580 linux_386.elf -
Enumerates kernel/hardware configuration 1 TTPs 2 IoCs
Reads contents of /sys virtual filesystem to enumerate system information.
description ioc Process File opened for reading /sys/kernel/mm/transparent_hugepage/hpage_pmd_size linux_386.elf File opened for reading /sys/kernel/mm/transparent_hugepage/hpage_pmd_size linux_386.elf -
description ioc Process File opened for reading /proc/1036/stat linux_386.elf File opened for reading /proc/1065/stat linux_386.elf File opened for reading /proc/1273/stat linux_386.elf File opened for reading /proc/filesystems mount File opened for reading /proc/1701/stat linux_386.elf File opened for reading /proc/263/stat linux_386.elf File opened for reading /proc/408/stat linux_386.elf File opened for reading /proc/684/stat linux_386.elf File opened for reading /proc/1817/stat linux_386.elf File opened for reading /proc/377/stat linux_386.elf File opened for reading /proc/592/stat linux_386.elf File opened for reading /proc/827/stat linux_386.elf File opened for reading /proc/1056/stat linux_386.elf File opened for reading /proc/1160/stat linux_386.elf File opened for reading /proc/1176/stat linux_386.elf File opened for reading /proc/1437/stat linux_386.elf File opened for reading /proc/1560/stat linux_386.elf File opened for reading /proc/filesystems sed File opened for reading /proc/746/stat linux_386.elf File opened for reading /proc/767/stat linux_386.elf File opened for reading /proc/1816/stat linux_386.elf File opened for reading /proc/1285/stat linux_386.elf File opened for reading /proc/filesystems sed File opened for reading /proc/1585/stat linux_386.elf File opened for reading /proc/1799/stat linux_386.elf File opened for reading /proc/filesystems systemctl File opened for reading /proc/1161/stat linux_386.elf File opened for reading /proc/1242/stat linux_386.elf File opened for reading /proc/1734/stat linux_386.elf File opened for reading /proc/613/stat linux_386.elf File opened for reading /proc/956/stat linux_386.elf File opened for reading /proc/1041/stat linux_386.elf File opened for reading /proc/1178/stat linux_386.elf File opened for reading /proc/1356/stat linux_386.elf File opened for reading /proc/414/stat linux_386.elf File opened for reading /proc/593/stat linux_386.elf File opened for reading /proc/1144/stat linux_386.elf File opened for reading /proc/1807/stat linux_386.elf File opened for reading /proc/858/stat linux_386.elf File opened for reading /proc/1260/stat linux_386.elf File opened for reading /proc/1731/stat linux_386.elf File opened for reading /proc/204/stat linux_386.elf File opened for reading /proc/737/stat linux_386.elf File opened for reading /proc/1159/stat linux_386.elf File opened for reading /proc/1568/stat linux_386.elf File opened for reading /proc/1569/stat linux_386.elf File opened for reading /proc/1722/stat linux_386.elf File opened for reading /proc/587/stat linux_386.elf File opened for reading /proc/1163/stat linux_386.elf File opened for reading /proc/1168/stat linux_386.elf File opened for reading /proc/1811/stat linux_386.elf File opened for reading /proc/223/stat linux_386.elf File opened for reading /proc/962/stat linux_386.elf File opened for reading /proc/1098/stat linux_386.elf File opened for reading /proc/1243/stat linux_386.elf File opened for reading /proc/1253/stat linux_386.elf File opened for reading /proc/200/stat linux_386.elf File opened for reading /proc/700/stat linux_386.elf File opened for reading /proc/871/stat linux_386.elf File opened for reading /proc/1016/stat linux_386.elf File opened for reading /proc/1191/stat linux_386.elf File opened for reading /proc/208/stat linux_386.elf File opened for reading /proc/222/stat linux_386.elf File opened for reading /proc/417/stat linux_386.elf -
GoLang User-Agent 1 IoCs
Uses default user-agent string defined by GoLang HTTP packages.
description flow ioc HTTP User-Agent header 7 Go-http-client/1.1
Processes
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/tmp/linux_386.elf/tmp/linux_386.elf1⤵
- Enumerates kernel/hardware configuration
PID:1562 -
/usr/bin/shsh -c "/etc/32678&"2⤵PID:1566
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/usr/sbin/serviceservice crond start2⤵PID:1567
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/usr/bin/basenamebasename /usr/sbin/service3⤵PID:1570
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/usr/bin/basenamebasename /usr/sbin/service3⤵PID:1572
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/usr/bin/sedsed -ne "s/\\.socket\\s*[a-z]*\\s*\$/.socket/p"3⤵
- Reads runtime system information
PID:1581
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/usr/bin/systemctlsystemctl list-unit-files --full "--type=socket"3⤵
- Reads runtime system information
PID:1579
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/tmp/linux_386.elf/tmp/linux_386.elf " "2⤵
- Modifies Watchdog functionality
- Creates/modifies environment variables
- Modifies init.d
- Modifies systemd
- Write file to user bin folder
- Modifies Bash startup script
- Changes its process name
- Enumerates kernel/hardware configuration
- Reads runtime system information
PID:1569 -
/usr/sbin/update-rc.dupdate-rc.d linux_kill defaults3⤵PID:1583
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/usr/local/sbin/systemctlsystemctl daemon-reload4⤵PID:1584
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/usr/local/bin/systemctlsystemctl daemon-reload4⤵PID:1584
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/usr/sbin/systemctlsystemctl daemon-reload4⤵PID:1584
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/usr/bin/systemctlsystemctl daemon-reload4⤵PID:1584
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/usr/bin/shsh -c "cd /boot;systemctl daemon-reload;systemctl enable linux.service;systemctl start linux.service;journalctl -xe --no-pager"3⤵PID:1621
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/usr/bin/systemctlsystemctl daemon-reload4⤵PID:1622
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/usr/bin/systemctlsystemctl enable linux.service4⤵PID:1662
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/usr/bin/systemctlsystemctl start linux.service4⤵PID:1700
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/usr/bin/journalctljournalctl -xe --no-pager4⤵PID:1716
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/usr/bin/shsh -c "cd /boot;ausearch -c 'System.img.conf' --raw | audit2allow -M my-Systemimgconf;semodule -X 300 -i my-Systemimgconf.pp"3⤵PID:1724
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/usr/bin/bashbash -c "echo \"*/1 * * * * root /.img \" >> /etc/crontab"3⤵
- Creates/modifies Cron job
PID:1727
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/usr/bin/renicerenice -20 15693⤵PID:1728
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/usr/bin/mountmount -o bind /tmp/ /proc/15693⤵
- Reads runtime system information
PID:1729
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/usr/sbin/serviceservice cron start3⤵PID:1731
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/usr/bin/basenamebasename /usr/sbin/service4⤵PID:1732
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/usr/bin/basenamebasename /usr/sbin/service4⤵PID:1733
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/usr/bin/sedsed -ne "s/\\.socket\\s*[a-z]*\\s*\$/.socket/p"4⤵
- Reads runtime system information
PID:1736
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/usr/bin/systemctlsystemctl list-unit-files --full "--type=socket"4⤵PID:1735
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/usr/local/sbin/systemctlsystemctl start cron.service3⤵PID:1731
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/usr/local/bin/systemctlsystemctl start cron.service3⤵PID:1731
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/usr/sbin/systemctlsystemctl start cron.service3⤵PID:1731
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/usr/bin/systemctlsystemctl start cron.service3⤵PID:1731
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/usr/bin/systemctlsystemctl start crond.service3⤵PID:1737
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/etc/32678/etc/326781⤵
- Executes dropped EXE
PID:1568 -
/usr/bin/sleepsleep 602⤵PID:1571
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/usr/local/sbin/systemctlsystemctl start crond.service1⤵PID:1567
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/usr/local/bin/systemctlsystemctl start crond.service1⤵PID:1567
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/usr/sbin/systemctlsystemctl start crond.service1⤵PID:1567
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/usr/bin/systemctlsystemctl start crond.service1⤵PID:1567
Network
MITRE ATT&CK Enterprise v15
Persistence
Boot or Logon Autostart Execution
3XDG Autostart Entries
1Boot or Logon Initialization Scripts
1RC Scripts
1Create or Modify System Process
1Systemd Service
1Event Triggered Execution
1Unix Shell Configuration Modification
1Hijack Execution Flow
1Path Interception by PATH Environment Variable
1Scheduled Task/Job
1Cron
1Privilege Escalation
Boot or Logon Autostart Execution
3XDG Autostart Entries
1Boot or Logon Initialization Scripts
1RC Scripts
1Create or Modify System Process
1Systemd Service
1Event Triggered Execution
1Unix Shell Configuration Modification
1Hijack Execution Flow
1Path Interception by PATH Environment Variable
1Scheduled Task/Job
1Cron
1Replay Monitor
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Downloads
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Filesize
33B
MD5d73d3376908ea075a939e3871ad0fabe
SHA1320ff65831247ba199515f1b94df26cc8a3e5f76
SHA256edbdabe30d8236a2c0a4eb89dfd597552130e4c1a4e93f8fe1568920442ad73a
SHA51257b83fef88620598beb5d65626bf757d0abef242d2d6a01796a61474dedc5095a4a9d0f292b6abb450cad3d4410ab8456253600f58ddb66cfe6d79e1c8415536
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Filesize
5.0MB
MD5f5c59e70b89c03eb69f02a7be662ed59
SHA1f1dc3d2d6c85692a2419517d3473bb370cf86510
SHA256ae49891720a4fa75f48a58efd4fc5dcd369f8c99add24e781191616f46149457
SHA51269a1fcdc968d5b2f2706a0c6294974d2cc211910033e8bd991ec9dad01eacf93b20dfb3c72f17130b29b53a8b1add45f04a6c1c7e1f81ff9f198184493354225
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Filesize
61B
MD5768eaf287796da19e1cf5e0b2fb1b161
SHA16a1ce2ee5ccc86d1f33806feb14547b35290df2a
SHA2561d22620dfb2a6715e5d745aed5cf841ede0e75e1747f12b9b925a2d346bc7ecb
SHA512e6af30c9df4f7f47696069511e64ecbc8e841629d692ee4056503df3533fb7a7a74960698826260355e1dba7b6c562482a27a39bb51a4237473ce4b68472d620
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Filesize
189B
MD53909975f7cc0d1121c1819b800069f31
SHA13e68de708c2e6c40fab6794afdee3104e5590189
SHA2566876dac71f13a068afb863d257134275f2edba43b2acaf4924fabf97c079070b
SHA51250600cceeb03b05f45ae61d890caee9f51ff390b6776930866e527e071d65d08241fc66673fd9b99d62fbc77d3c00fc3de4d7378cbc42f5daba5d83072b0906e
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Filesize
37B
MD5cfb4e51061485fe91169381fbdc1538e
SHA19a85b9b766a15b01737a41d680e4593b7a9bde87
SHA256897f37267d0ceaa2fbdaa09847f5d08e6f8b01a0348a0d666264b0f10acd0c90
SHA512fb154ec711d2090a7461da4db8ddad2b522649a27e74162ecb203f539b1729430288bc02d78d2071bde9c4bbc005693403a57612ef50277d52f816cb94524216