MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 cf9275a7b7b401a7656a6d9b153aab36b60f52521e41b4a6107135358ab69ccb. While MalwareBazaar tries to identify whether the sample provided is malicious or not, there is no guarantee that a sample in MalwareBazaar is malicious.

Database Entry


Mirai


Vendor detections: 11


Intelligence 11 IOCs YARA 6 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: cf9275a7b7b401a7656a6d9b153aab36b60f52521e41b4a6107135358ab69ccb
SHA3-384 hash: 04835ed8b3114554884d7f0f4a3943da3d1693da935c35dd923b53e953526a8390f444e8ff1ccce460b3753183ac9017
SHA1 hash: 8ed2a6c32a31fd4d3f92556130c62b7ed4786bbd
MD5 hash: 417fa7abd930053cca69fe71275da1df
humanhash: colorado-football-white-artist
File name:arm7.kok
Download: download sample
Signature Mirai
Create hunting rule
File size:135'976 bytes
First seen:2026-01-09 20:22:42 UTC
Last seen:Never
File type: elf
MIME type:application/x-executable
ssdeep 3072:35R5BvJJk79nan8nmaXzDkauqXixcDl3ofA1fZzwIQ99+:35R5BK9nan8mo3kauqXixcDxofGzzQ9o
TLSH T151D31A56BD819F11D4C721BAFBAE414933136FB8D3FA71119D20AF61238A59B0F7B212
telfhash t109e02b19d7a01e2c17e4550499dd716af77c317d2b0028b7206c8a9b86a3f94b62511a
Magika elf
Reporter abuse_ch
Tags:elf mirai

Intelligence

File Origin
# of uploads :
1
# of downloads :
41
Origin country :
DE DE
Vendor Threat Intelligence
No detections
Detection(s):
Sanesecurity.Malware.30455.LC.BadVar.UNOFFICIAL
Create hunting rule

Unix.Trojan.Mirai-10001386-0
Create hunting rule

Unix.Trojan.Mirai-10010127-0
Create hunting rule

Unix.Trojan.Mirai-10017351-0
Create hunting rule

Result
Verdict:
Malware
Maliciousness:

Behaviour
Changes the time when the file was created, accessed, or modified
Deletes a file
Receives data from a server
Attempts to kill processes by name
Opens a port
Sends data to a server
Deleting a recently created file
Launching a process
Connection attempt
Sets a written file as executable
Creating a file
Changes access rights for a written file
Runs as daemon
Creating a process from a recently created file
Kills processes
Writes files to system directory
Creates or modifies files in /cron to set up autorun
Substitutes an application name
Creates or modifies files in /init.d to set up autorun
Creates or modifies files to set up autorun
Verdict:
Unknown
Threat level:
  0/10
Confidence:
100%
Tags:
gcc masquerade mirai rust
Link:
https://www.filescan.io/uploads/696163ca30368802bb7e6f49/reports/11f14b20-8b25-471b-ad58-ab762f1c12fe/overview
Verdict:
Malicious
File Type:
elf.32.le
First seen:
2026-01-09T17:29:00Z UTC
Last seen:
2026-01-09T17:53:00Z UTC
Hits:
~10
Detections:
HEUR:Backdoor.Linux.Gafgyt.gu HEUR:Backdoor.Linux.Mirai.b HEUR:Backdoor.Linux.Gafgyt.ij
Link:
https://opentip.kaspersky.com/cf9275a7b7b401a7656a6d9b153aab36b60f52521e41b4a6107135358ab69ccb/results?tab=lookup
Status:
terminated
Link:
https://sandbox.kunai.rocks/analysis/7b4e4b50-fc7f-444c-ae8d-bfd7fc327dc4
Behavior Graph:
Download SVG
%3 guuid=16667191-1600-0000-1187-8e75ff0c0000 pid=3327 /usr/bin/sudo guuid=ae771f93-1600-0000-1187-8e75050d0000 pid=3333 /tmp/sample.bin guuid=16667191-1600-0000-1187-8e75ff0c0000 pid=3327->guuid=ae771f93-1600-0000-1187-8e75050d0000 pid=3333 execve
Verdict:
Malicious
Link:
https://analyze.intezer.com/analyses/16359a39-8be0-4c28-bdee-84aa40c576b0
Result
Threat name:
n/a
Detection:
malicious
Classification:
spre.troj.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/1847632
Signature
Connects to many ports of the same IP (likely port scanning)
Drops files in suspicious directories
Drops invisible ELF files
Executes the "crontab" command typically for achieving persistence
Modifies the '.bashrc' or '.bash_profile' file typically for persisting actions
Multi AV Scanner detection for submitted file
Sample deletes itself
Sample reads /proc/mounts (often used for finding a writable filesystem)
Sample tries to kill a massive number of system processes
Sample tries to kill multiple processes (SIGKILL)
Sample tries to persist itself using /etc/profile
Sample tries to persist itself using cron
Sample tries to persist itself using System V runlevels
Sample tries to set files in /etc globally writable
Terminates several processes with shell command 'killall'
Writes identical ELF files to multiple locations
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 dnsIp2 2 Behavior Graph ID: 1847632 Sample: arm7.kok.elf Startdate: 09/01/2026 Architecture: LINUX Score: 100 96 143.20.58.53, 11154, 11665, 11917 LANCAMANTOANISERVICOSDEINFORMATICALTDA-MEBR United States 2->96 98 185.254.96.119, 22, 33350, 42818 AVORODE Germany 2->98 100 23 other IPs or domains 2->100 116 Multi AV Scanner detection for submitted file 2->116 118 Connects to many ports of the same IP (likely port scanning) 2->118 11 arm7.kok.elf 2->11         started        14 dash rm 2->14         started        16 dash rm 2->16         started        signatures3 process4 signatures5 130 Sample tries to kill multiple processes (SIGKILL) 11->130 132 Sample reads /proc/mounts (often used for finding a writable filesystem) 11->132 18 arm7.kok.elf 11->18         started        process6 file7 88 /var/spool/cron/root, ASCII 18->88 dropped 90 /var/spool/cron/crontabs/root, ASCII 18->90 dropped 92 /root/.bashrc, ASCII 18->92 dropped 94 7 other files (6 malicious) 18->94 dropped 120 Sample tries to set files in /etc globally writable 18->120 122 Sample tries to persist itself using /etc/profile 18->122 124 Drops files in suspicious directories 18->124 126 4 other signatures 18->126 22 arm7.kok.elf sh 18->22         started        24 arm7.kok.elf sh 18->24         started        26 arm7.kok.elf sh 18->26         started        28 131 other processes 18->28 signatures8 process9 signatures10 31 sh S99network 22->31         started        33 sh cp 24->33         started        37 sh crontab 26->37         started        39 sh 26->39         started        134 Sample tries to kill a massive number of system processes 28->134 136 Sample tries to kill multiple processes (SIGKILL) 28->136 41 sh cp 28->41         started        43 sh cp 28->43         started        45 sh cp 28->45         started        47 100 other processes 28->47 process11 file12 49 S99network 31->49         started        70 /usr/bin/.update, ELF 33->70 dropped 102 Writes identical ELF files to multiple locations 33->102 104 Drops invisible ELF files 33->104 106 Drops files in suspicious directories 33->106 72 /var/spool/cron/crontabs/tmp.cjr37m, ASCII 37->72 dropped 108 Sample tries to persist itself using cron 37->108 110 Executes the "crontab" command typically for achieving persistence 37->110 51 sh crontab 39->51         started        74 /var/jbx/shared/.update, ELF 41->74 dropped 76 /var/log/.update, ELF 43->76 dropped 78 /var/.update, ELF 45->78 dropped 80 /root/.update, ELF 47->80 dropped 82 /mnt/.update, ELF 47->82 dropped 84 /media/.update, ELF 47->84 dropped 86 2 other malicious files 47->86 dropped 112 Sample deletes itself 47->112 114 Terminates several processes with shell command 'killall' 47->114 54 .monitor 47->54         started        56 sh arm7.kok.elf 47->56         started        signatures13 process14 signatures15 58 S99network arm7.kok.elf 49->58         started        60 S99network arm7.kok.elf 49->60         started        62 S99network arm7.kok.elf 49->62         started        68 131 other processes 49->68 128 Executes the "crontab" command typically for achieving persistence 51->128 64 .monitor arm7.kok.elf 54->64         started        66 .monitor sleep 54->66         started        process16
Score:
100%
Verdict:
Malware
File Type:
ELF
Link:
https://malprob.io/report/cf9275a7b7b401a7656a6d9b153aab36b60f52521e41b4a6107135358ab69ccb
Detection:
mirai
Create hunting rule
Link:
https://mwdb.cert.pl/sample/cf9275a7b7b401a7656a6d9b153aab36b60f52521e41b4a6107135358ab69ccb/
Verdict:
Malicious
Threat:
Family.MIRAI
Link:
https://tip.neiki.dev/file/cf9275a7b7b401a7656a6d9b153aab36b60f52521e41b4a6107135358ab69ccb
Threat name:
Linux.Worm.Mirai
Create hunting rule
Status:
Malicious
First seen:
2026-01-09 20:23:45 UTC
File Type:
ELF32 Little (Exe)
AV detection:
14 of 24 (58.33%)
Threat level:
  5/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=z6jhlj5xwqa2ozlknwnrkovlg23a6ussdza3jjqqoe2tlcvwttfq._file
Result
Malware family:
mirai
Create hunting rule
Score:
  10/10
Tags:
family:mirai defense_evasion discovery execution persistence privilege_escalation
Link:
https://tria.ge/reports/260109-y6fc6sg19g/
Behaviour
Command and Scripting Interpreter: Unix Shell
Reads runtime system information
Writes file to shm directory
Changes its process name
Modifies Bash startup script
Creates/modifies Cron job
Creates/modifies environment variables
Deletes log files
Enumerates running processes
Modifies init.d
Modifies rc script
Write file to user bin folder
Executes dropped EXE
Unexpected DNS network traffic destination
Creates a large amount of network flows
Verdict:
Malicious
Tags:
Unix.Trojan.Mirai-10001386-0
YARA:
n/a
Link:
https://app.threat.zone/submission/0f0063b2-7877-41e5-9964-88981853c713
Please note that we are no longer able to provide a coverage score for Virus Total.
Threat name:
Legit
Score:
0.00
Link:
https://yomi.yoroi.company/submissions/cf9275a7b7b401a7656a6d9b153aab36b60f52521e41b4a6107135358ab69ccb

YARA Signatures

MalwareBazaar uses YARA rules from several public and non-public repositories, such as YARAhub and Malpedia. Those are being matched against malware samples uploaded to MalwareBazaar as well as against any suspicious process dumps they may create. Please note that only results from TLP:CLEAR rules are being displayed.

Rule name:ach_202503_elf_Mirai
Create hunting rule
Author:abuse.ch
Description:Detects Mirai 'TSource' ELF files
Rule name:ELF_IoT_Persistence_Hunt
Create hunting rule
Author:4r4
Description:Hunts for ELF files with persistence and download capabilities
Rule name:ELF_Toriilike_persist
Create hunting rule
Author:4r4
Description:Detects Torii IoT Botnet (stealthier Mirai alternative)
Reference:Identified via researched data
Rule name:enterpriseapps2
Create hunting rule
Author:Tim Brown @timb_machine
Description:Enterprise apps
Rule name:Linux_Generic_Threat_8299c877
Create hunting rule
Author:Elastic Security
Rule name:unixredflags3
Create hunting rule
Author:Tim Brown @timb_machine
Description:Hunts for UNIX red flags

File information

The table below shows additional information about this malware sample such as delivery method and external references.

Web download

Mirai

elf cf9275a7b7b401a7656a6d9b153aab36b60f52521e41b4a6107135358ab69ccb

(this sample)

  
URLhaus
https://urlhaus.abuse.ch/url/3749715/
  
Delivery method
Distributed via web download

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