kaiji | 6f4b61e7b4fb7593a028f202cc013ede7846bcb421b4c3c76b2ed4755ae34fee

Analysis

max time kernel
123s
max time network
153s
platform
debian-9_mips
resource
debian9-mipsbe-20240611-en
resource tags

arch:mipsimage:debian9-mipsbe-20240611-enkernel:4.9.0-13-4kc-maltalocale:en-usos:debian-9-mipssystem
submitted
31/10/2024, 23:39

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General

Target
linux_mips.elf
Size 5.6MB
Sample241031-3m96navblc
SHA256 6f4b61e7b4fb7593a028f202cc013ede7846bcb421b4c3c76b2ed4755ae34fee
MD5 4fc6fd63cda2d6e00143a264e4139492
SHA1 8bc0d512c13040f90c1f5dfdd597f7c22b20cce6
SHA512 91136f5be79d49243ec9b0c180c9f337ef1f5185e673dd020514697ca147cd3eef32664804b7d27a08067f18f16ae8d70b5a000f98fbe9e22f0cc54dbb5c0fcc
SSDEEP 49152:H2EpH9kX4nazMqH5Erob6XMv7fn3FuL9idt42uXYfTYetBDa9zrHAMnvHsLFnoeF:WEiAQmMZudhDM
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

kaiji discovery execution persistence privilege_escalatio

Malware Config

Signatures

Kaiji 1 IoCs

Kaiji payload

resource	yara_rule
behavioral1/files/fstream-1.dat	Kaiji

Kaiji family
kaiji

kaiji_chaosbot 1 IoCs

Chaos-variant payload

resource	yara_rule
behavioral1/files/fstream-1.dat	kaiji_chaosbot

Executes dropped EXE 4 IoCs

ioc	pid	Process
/etc/32678	732	32678
/etc/id.services.conf	790	id.services.conf
/etc/id.services.conf	797	id.services.conf
/etc/32678	799	32678

Creates/modifies Cron job 1 TTPs 1 IoCs

Cron allows running tasks on a schedule, and is commonly used for malware persistence.

execution persistence privilege_escalatio

Cron

T1053.003

description	ioc	Process
File opened for modification	/etc/crontab	bash

Enumerates running processes
Discovers information about currently running processes on the system

Changes its process name 1 IoCs

description	ioc	pid	Process
Changes the process name, possibly in an attempt to hide itself	ksoftirqd/0	742	linux_mips.elf

Reads CPU attributes 1 TTPs 1 IoCs

discovery

System Information Discovery

T1082

description	ioc	Process
File opened for reading	/sys/devices/system/cpu/online	pkill

Enumerates kernel/hardware configuration 1 TTPs 15 IoCs

Reads contents of /sys virtual filesystem to enumerate system information.

discovery

System Information Discovery

T1082

description	ioc	Process
File opened for reading	/sys/fs/kdbus/0-system/bus	systemctl
File opened for reading	/sys/fs/kdbus/0-system/bus	systemctl
File opened for reading	/sys/fs/kdbus/0-system/bus	systemctl
File opened for reading	/sys/fs/kdbus/0-system/bus	systemctl
File opened for reading	/sys/fs/kdbus/0-system/bus	systemctl
File opened for reading	/sys/fs/kdbus/0-system/bus	systemctl
File opened for reading	/sys/kernel/mm/transparent_hugepage/hpage_pmd_size	id.services.conf
File opened for reading	/sys/fs/kdbus/0-system/bus	systemctl
File opened for reading	/sys/kernel/mm/transparent_hugepage/hpage_pmd_size	linux_mips.elf
File opened for reading	/sys/fs/kdbus/0-system/bus	systemctl
File opened for reading	/sys/kernel/mm/transparent_hugepage/hpage_pmd_size	id.services.conf
File opened for reading	/sys/kernel/mm/transparent_hugepage/hpage_pmd_size	linux_mips.elf
File opened for reading	/sys/fs/kdbus/0-system/bus	systemctl
File opened for reading	/sys/fs/kdbus/0-system/bus	systemctl
File opened for reading	/sys/fs/kdbus/0-system/bus	systemctl

Reads runtime system information 64 IoCs

Reads data from /proc virtual filesystem.

discovery

description	ioc	Process
File opened for reading	/proc/self/stat	systemctl
File opened for reading	/proc/sys/kernel/osrelease	pkill
File opened for reading	/proc/19/cmdline	pkill
File opened for reading	/proc/126/status	pkill
File opened for reading	/proc/333/cmdline	pkill
File opened for reading	/proc/710/status	pkill
File opened for reading	/proc/790/cmdline	pkill
File opened for reading	/proc/filesystems	systemctl
File opened for reading	/proc/filesystems	sed
File opened for reading	/proc/cmdline	systemctl
File opened for reading	/proc/1/environ	systemctl
File opened for reading	/proc/9/cmdline	pkill
File opened for reading	/proc/81/status	pkill
File opened for reading	/proc/761/cmdline	pkill
File opened for reading	/proc/self/stat	systemctl
File opened for reading	/proc/1/environ	systemctl
File opened for reading	/proc/22/status	pkill
File opened for reading	/proc/78/status	pkill
File opened for reading	/proc/111/cmdline	pkill
File opened for reading	/proc/self/stat	systemctl
File opened for reading	/proc/1/environ	systemctl
File opened for reading	/proc/self/stat	systemctl
File opened for reading	/proc/126/cmdline	pkill
File opened for reading	/proc/cmdline	systemctl
File opened for reading	/proc/15/status	pkill
File opened for reading	/proc/36/status	pkill
File opened for reading	/proc/487/status	pkill
File opened for reading	/proc/692/cmdline	pkill
File opened for reading	/proc/711/cmdline	pkill
File opened for reading	/proc/722/status	pkill
File opened for reading	/proc/1/environ	systemctl
File opened for reading	/proc/filesystems	systemctl
File opened for reading	/proc/20/cmdline	pkill
File opened for reading	/proc/70/status	pkill
File opened for reading	/proc/332/status	pkill
File opened for reading	/proc/386/cmdline	pkill
File opened for reading	/proc/self/stat	systemctl
File opened for reading	/proc/2/cmdline	pkill
File opened for reading	/proc/235/status	pkill
File opened for reading	/proc/660/cmdline	pkill
File opened for reading	/proc/self/stat	systemctl
File opened for reading	/proc/self/stat	systemctl
File opened for reading	/proc/cmdline	systemctl
File opened for reading	/proc/1/status	pkill
File opened for reading	/proc/2/status	pkill
File opened for reading	/proc/37/cmdline	pkill
File opened for reading	/proc/718/status	pkill
File opened for reading	/proc/1/environ	systemctl
File opened for reading	/proc/72/cmdline	pkill
File opened for reading	/proc/76/cmdline	pkill
File opened for reading	/proc/660/status	pkill
File opened for reading	/proc/4/status	pkill
File opened for reading	/proc/17/cmdline	pkill
File opened for reading	/proc/69/cmdline	pkill
File opened for reading	/proc/333/status	pkill
File opened for reading	/proc/731/status	pkill
File opened for reading	/proc/722/cmdline	pkill
File opened for reading	/proc/cmdline	systemctl
File opened for reading	/proc/cmdline	systemctl
File opened for reading	/proc/13/cmdline	pkill
File opened for reading	/proc/23/cmdline	pkill
File opened for reading	/proc/111/status	pkill
File opened for reading	/proc/674/status	pkill
File opened for reading	/proc/3/cmdline	pkill

System Network Configuration Discovery 1 TTPs 2 IoCs

Adversaries may gather information about the network configuration of a system.

discovery

System Network Configuration Discovery

T1016

pid	Process
713	linux_mips.elf
731	linux_mips.elf

GoLang User-Agent 1 IoCs

Uses default user-agent string defined by GoLang HTTP packages.

description	flow	ioc
HTTP User-Agent header	6	Go-http-client/1.1

/tmp/linux_mips.elf
/tmp/linux_mips.elf
1⤵
- Enumerates kernel/hardware configuration
- System Network Configuration Discovery
PID:713
- /bin/sh
  sh -c "/etc/32678&"
  2⤵
  PID:729
- /usr/sbin/service
  service crond start
  2⤵
  PID:730
- - /usr/bin/basename
    basename /usr/sbin/service
    3⤵
    PID:737
- - /usr/bin/basename
    basename /usr/sbin/service
    3⤵
    PID:740
- - /bin/systemctl
    systemctl --quiet is-active multi-user.target
    3⤵
    - Enumerates kernel/hardware configuration
    - Reads runtime system information
    PID:748
- - /bin/systemctl
    systemctl list-unit-files --full "--type=socket"
    3⤵
    - Enumerates kernel/hardware configuration
    - Reads runtime system information
    PID:753
- - /bin/sed
    sed -ne "s/\\.socket\\s*[a-z]*\\s*\$/.socket/p"
    3⤵
    - Reads runtime system information
    PID:755
- /tmp/linux_mips.elf
  /tmp/linux_mips.elf " "
  2⤵
  - Changes its process name
  - Enumerates kernel/hardware configuration
  - System Network Configuration Discovery
  PID:731
- - /usr/sbin/update-rc.d
    update-rc.d linux_kill defaults
    3⤵
    PID:746
  - - /usr/local/sbin/systemctl
      systemctl daemon-reload
      4⤵
      PID:758
  - - /usr/local/bin/systemctl
      systemctl daemon-reload
      4⤵
      PID:758
  - - /usr/sbin/systemctl
      systemctl daemon-reload
      4⤵
      PID:758
  - - /usr/bin/systemctl
      systemctl daemon-reload
      4⤵
      PID:758
  - - /sbin/systemctl
      systemctl daemon-reload
      4⤵
      PID:758
  - - /bin/systemctl
      systemctl daemon-reload
      4⤵
      Enumerates kernel/hardware configuration
      Reads runtime system information
      PID:758
- - /bin/bash
    bash -c "echo \"*/1 * * * * root /.img \" >> /etc/crontab"
    3⤵
    - Creates/modifies Cron job
    PID:763
- - /usr/bin/renice
    renice -20 731
    3⤵
    PID:765
- - /bin/mount
    mount -o bind /tmp/ /proc/731
    3⤵
    PID:766
- - /usr/sbin/service
    service cron start
    3⤵
    PID:767
  - - /usr/bin/basename
      basename /usr/sbin/service
      4⤵
      PID:768
  - - /usr/bin/basename
      basename /usr/sbin/service
      4⤵
      PID:769
  - - /bin/systemctl
      systemctl --quiet is-active multi-user.target
      4⤵
      Enumerates kernel/hardware configuration
      Reads runtime system information
      PID:770
  - - /bin/systemctl
      systemctl list-unit-files --full "--type=socket"
      4⤵
      Enumerates kernel/hardware configuration
      Reads runtime system information
      PID:772
  - - /bin/sed
      sed -ne "s/\\.socket\\s*[a-z]*\\s*\$/.socket/p"
      4⤵
      PID:773
- - /usr/local/sbin/systemctl
    systemctl "--job-mode=ignore-dependencies" start cron.service
    3⤵
    PID:767
- - /usr/local/bin/systemctl
    systemctl "--job-mode=ignore-dependencies" start cron.service
    3⤵
    PID:767
- - /usr/sbin/systemctl
    systemctl "--job-mode=ignore-dependencies" start cron.service
    3⤵
    PID:767
- - /usr/bin/systemctl
    systemctl "--job-mode=ignore-dependencies" start cron.service
    3⤵
    PID:767
- - /sbin/systemctl
    systemctl "--job-mode=ignore-dependencies" start cron.service
    3⤵
    PID:767
- - /bin/systemctl
    systemctl "--job-mode=ignore-dependencies" start cron.service
    3⤵
    - Enumerates kernel/hardware configuration
    - Reads runtime system information
    PID:767
- - /bin/systemctl
    systemctl start crond.service
    3⤵
    - Enumerates kernel/hardware configuration
    - Reads runtime system information
    PID:774

/etc/32678
/etc/32678
1⤵
- Executes dropped EXE
PID:732
- /bin/sleep
  sleep 60
  2⤵
  PID:739
- /etc/id.services.conf
  /etc/id.services.conf
  2⤵
  - Executes dropped EXE
  - Enumerates kernel/hardware configuration
  PID:790
- - /usr/bin/pkill
    pkill -9 32678
    3⤵
    - Reads CPU attributes
    - Reads runtime system information
    PID:794
- - /bin/sh
    sh -c "/etc/32678&"
    3⤵
    PID:795
- - /usr/sbin/service
    service crond start
    3⤵
    PID:796
  - - /usr/bin/basename
      basename /usr/sbin/service
      4⤵
      PID:800
  - - /usr/bin/basename
      basename /usr/sbin/service
      4⤵
      PID:805
  - - /bin/systemctl
      systemctl --quiet is-active multi-user.target
      4⤵
      Enumerates kernel/hardware configuration
      Reads runtime system information
      PID:806
  - - /bin/systemctl
      systemctl list-unit-files --full "--type=socket"
      4⤵
      Enumerates kernel/hardware configuration
      Reads runtime system information
      PID:808
  - - /bin/sed
      sed -ne "s/\\.socket\\s*[a-z]*\\s*\$/.socket/p"
      4⤵
      PID:809
- - /etc/id.services.conf
    /etc/id.services.conf " "
    3⤵
    - Executes dropped EXE
    - Enumerates kernel/hardware configuration
    PID:797

/usr/local/sbin/systemctl
systemctl "--job-mode=ignore-dependencies" start crond.service
1⤵
PID:730

/usr/local/bin/systemctl
systemctl "--job-mode=ignore-dependencies" start crond.service
1⤵
PID:730

/usr/sbin/systemctl
systemctl "--job-mode=ignore-dependencies" start crond.service
1⤵
PID:730

/usr/bin/systemctl
systemctl "--job-mode=ignore-dependencies" start crond.service
1⤵
PID:730

/sbin/systemctl
systemctl "--job-mode=ignore-dependencies" start crond.service
1⤵
PID:730

/bin/systemctl
systemctl "--job-mode=ignore-dependencies" start crond.service
1⤵
- Enumerates kernel/hardware configuration
- Reads runtime system information
PID:730

/etc/32678
/etc/32678
1⤵
- Executes dropped EXE
PID:799
- /bin/sleep
  sleep 60
  2⤵
  PID:804

/usr/local/sbin/systemctl
systemctl "--job-mode=ignore-dependencies" start crond.service
1⤵
PID:796

/usr/local/bin/systemctl
systemctl "--job-mode=ignore-dependencies" start crond.service
1⤵
PID:796

/usr/sbin/systemctl
systemctl "--job-mode=ignore-dependencies" start crond.service
1⤵
PID:796

/usr/bin/systemctl
systemctl "--job-mode=ignore-dependencies" start crond.service
1⤵
PID:796

/sbin/systemctl
systemctl "--job-mode=ignore-dependencies" start crond.service
1⤵
PID:796

/bin/systemctl
systemctl "--job-mode=ignore-dependencies" start crond.service
1⤵
- Enumerates kernel/hardware configuration
PID:796

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Cron

T1053.003

Persistence

Scheduled Task/Job

T1053

Cron

T1053.003

Privilege Escalation

Scheduled Task/Job

T1053

Cron

T1053.003

Defense Evasion

Credential Access

Discovery

System Information Discovery

T1082

System Network Configuration Discovery

T1016

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

.img

Path /.img
Size 33B
SHA256 edbdabe30d8236a2c0a4eb89dfd597552130e4c1a4e93f8fe1568920442ad73a
MD5 d73d3376908ea075a939e3871ad0fabe
SHA1 320ff65831247ba199515f1b94df26cc8a3e5f76
SHA512 57b83fef88620598beb5d65626bf757d0abef242d2d6a01796a61474dedc5095a4a9d0f292b6abb450cad3d4410ab8456253600f58ddb66cfe6d79e1c8415536
MD5 SHA1 SHA512

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32678

Path /etc/32678
Size 61B
SHA256 1d22620dfb2a6715e5d745aed5cf841ede0e75e1747f12b9b925a2d346bc7ecb
MD5 768eaf287796da19e1cf5e0b2fb1b161
SHA1 6a1ce2ee5ccc86d1f33806feb14547b35290df2a
SHA512 e6af30c9df4f7f47696069511e64ecbc8e841629d692ee4056503df3533fb7a7a74960698826260355e1dba7b6c562482a27a39bb51a4237473ce4b68472d620
MD5 SHA1 SHA512

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id.services.conf

Path /etc/id.services.conf
Size 5.6MB
SHA256 6f4b61e7b4fb7593a028f202cc013ede7846bcb421b4c3c76b2ed4755ae34fee
MD5 4fc6fd63cda2d6e00143a264e4139492
SHA1 8bc0d512c13040f90c1f5dfdd597f7c22b20cce6
SHA512 91136f5be79d49243ec9b0c180c9f337ef1f5185e673dd020514697ca147cd3eef32664804b7d27a08067f18f16ae8d70b5a000f98fbe9e22f0cc54dbb5c0fcc
SSDEEP 49152:H2EpH9kX4nazMqH5Erob6XMv7fn3FuL9idt42uXYfTYetBDa9zrHAMnvHsLFnoeF:WEiAQmMZudhDM
MD5 SHA1 SHA512 SSDEEP

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linux_kill

Path /etc/init.d/linux_kill
Size 189B
SHA256 6876dac71f13a068afb863d257134275f2edba43b2acaf4924fabf97c079070b
MD5 3909975f7cc0d1121c1819b800069f31
SHA1 3e68de708c2e6c40fab6794afdee3104e5590189
SHA512 50600cceeb03b05f45ae61d890caee9f51ff390b6776930866e527e071d65d08241fc66673fd9b99d62fbc77d3c00fc3de4d7378cbc42f5daba5d83072b0906e
MD5 SHA1 SHA512

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bash_config.sh

Path /etc/profile.d/bash_config.sh
Size 37B
SHA256 897f37267d0ceaa2fbdaa09847f5d08e6f8b01a0348a0d666264b0f10acd0c90
MD5 cfb4e51061485fe91169381fbdc1538e
SHA1 9a85b9b766a15b01737a41d680e4593b7a9bde87
SHA512 fb154ec711d2090a7461da4db8ddad2b522649a27e74162ecb203f539b1729430288bc02d78d2071bde9c4bbc005693403a57612ef50277d52f816cb94524216
MD5 SHA1 SHA512

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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