MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 4f8fb83b6c854a72cd242e8a8e095d75593b2834e4ea47d3e9b913a5e293ea0c. 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: 12


Intelligence 12 IOCs YARA 7 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: 4f8fb83b6c854a72cd242e8a8e095d75593b2834e4ea47d3e9b913a5e293ea0c
SHA3-384 hash: a733979279681384eafb72b9ac59b17c13a1fd51b3c482a784e3601eabe36bf7687261f63c73b937c0d24a3ce290af0b
SHA1 hash: ad5d385e5e6a24c3577eef0cbf792e2293a6481f
MD5 hash: db1e743b766ff2e5c5b0e0911a332758
humanhash: montana-twelve-two-kilo
File name:arm5.kok
Download: download sample
Signature Mirai
Create hunting rule
File size:107'732 bytes
First seen:2026-01-10 06:32:43 UTC
Last seen:Never
File type: elf
MIME type:application/x-executable
ssdeep 1536:1CZrp5I4oi7UG11dqXdJESSnngLW7NDjwDajQZtvjZOHcIs/UEC4vy5KiX76TX:1CZrpS4PtKd9LRqQZ9gElv/
TLSH T1A5B34C96FCC1E902C6C522B7FB1E428D771757B8D3EA72039D266B21338A46A0F7B540
telfhash t1ecd02b77c6b0649ed7d10884418e6b1189fdfe3e0f20300a02dc2fcac1e3665b10e42a
TrID 50.1% (.) ELF Executable and Linkable format (Linux) (4022/12)
49.8% (.O) ELF Executable and Linkable format (generic) (4000/1)
Magika elf
Reporter abuse_ch
Tags:elf mirai

Intelligence

File Origin
# of uploads :
1
# of downloads :
59
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:
Verdict:
Malicious
Threat level:
  10/10
Confidence:
100%
Tags:
gafgyt masquerade mirai rust
Link:
https://www.filescan.io/uploads/6961f2bf07ef5fa68e838f00/reports/bc2a3d66-7f2f-47f1-8d2d-d380eecb9264/overview
Verdict:
Malicious
File Type:
elf.32.le
First seen:
2026-01-10T00:13:00Z UTC
Last seen:
2026-01-10T04:00:00Z UTC
Hits:
~10
Detections:
HEUR:Backdoor.Linux.Mirai.b HEUR:Backdoor.Linux.Gafgyt.ij HEUR:Backdoor.Linux.Gafgyt.gu
Link:
https://opentip.kaspersky.com/4f8fb83b6c854a72cd242e8a8e095d75593b2834e4ea47d3e9b913a5e293ea0c/results?tab=lookup
Status:
terminated
Link:
https://sandbox.kunai.rocks/analysis/d0f1f6f8-0090-40c0-8e78-e3bb18fac057
Behavior Graph:
Download SVG
%3 guuid=bddeae73-1900-0000-9375-1d5a67140000 pid=5223 /usr/bin/sudo guuid=0285f875-1900-0000-9375-1d5a68140000 pid=5224 /tmp/sample.bin guuid=bddeae73-1900-0000-9375-1d5a67140000 pid=5223->guuid=0285f875-1900-0000-9375-1d5a68140000 pid=5224 execve
Malware family:
Mirai
Create hunting rule
Verdict:
Malicious
Link:
https://analyze.intezer.com/analyses/10b5d73c-b62d-45d1-98d3-b2d010e891bd
Result
Threat name:
n/a
Detection:
malicious
Classification:
spre.troj.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/1847793
Signature
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: 1847793 Sample: arm5.kok.elf Startdate: 10/01/2026 Architecture: LINUX Score: 100 104 91.92.241.12, 48150, 6969 THEZONEBG Bulgaria 2->104 106 109.202.202.202, 80 INIT7CH Switzerland 2->106 108 3 other IPs or domains 2->108 124 Multi AV Scanner detection for submitted file 2->124 11 arm5.kok.elf 2->11         started        14 dash rm 2->14         started        16 dash rm 2->16         started        signatures3 process4 signatures5 136 Sample tries to kill multiple processes (SIGKILL) 11->136 138 Sample reads /proc/mounts (often used for finding a writable filesystem) 11->138 18 arm5.kok.elf 11->18         started        process6 file7 96 /var/spool/cron/root, ASCII 18->96 dropped 98 /var/spool/cron/crontabs/root, ASCII 18->98 dropped 100 /root/.bashrc, ASCII 18->100 dropped 102 11 other files (10 malicious) 18->102 dropped 126 Sample tries to set files in /etc globally writable 18->126 128 Sample tries to persist itself using /etc/profile 18->128 130 Drops files in suspicious directories 18->130 132 4 other signatures 18->132 22 arm5.kok.elf sh 18->22         started        24 arm5.kok.elf sh 18->24         started        26 arm5.kok.elf sh 18->26         started        28 21 other processes 18->28 signatures8 process9 signatures10 31 sh .monitor 22->31         started        33 sh cp 24->33         started        37 sh crontab 26->37         started        39 sh 26->39         started        140 Sample tries to kill a massive number of system processes 28->140 142 Sample tries to kill multiple processes (SIGKILL) 28->142 41 sh S99backup0 28->41         started        43 sh S99backup1 28->43         started        45 sh S99backup2 28->45         started        47 19 other processes 28->47 process11 file12 49 .monitor 31->49         started        86 /usr/bin/.update, ELF 33->86 dropped 110 Writes identical ELF files to multiple locations 33->110 112 Drops invisible ELF files 33->112 114 Drops files in suspicious directories 33->114 88 /var/spool/cron/crontabs/tmp.ER1xto, ASCII 37->88 dropped 116 Sample tries to persist itself using cron 37->116 118 Executes the "crontab" command typically for achieving persistence 37->118 51 sh crontab 39->51         started        54 S99backup0 41->54         started        56 S99backup1 43->56         started        58 S99backup2 45->58         started        90 /var/log/.update, ELF 47->90 dropped 92 /var/jbx/shared/.update, ELF 47->92 dropped 94 /boot/.update, ELF 47->94 dropped 120 Sample deletes itself 47->120 122 Terminates several processes with shell command 'killall' 47->122 60 S99network 47->60         started        62 sh .update 47->62         started        64 sh .update 47->64         started        66 sh .update 47->66         started        signatures13 process14 signatures15 76 54 other processes 49->76 134 Executes the "crontab" command typically for achieving persistence 51->134 68 S99backup0 .update 54->68         started        78 31 other processes 54->78 70 S99backup1 .update 56->70         started        80 29 other processes 56->80 72 S99backup2 .update 58->72         started        82 27 other processes 58->82 74 S99network .update 60->74         started        84 25 other processes 60->84 process16
Score:
100%
Verdict:
Malware
File Type:
ELF
Link:
https://malprob.io/report/4f8fb83b6c854a72cd242e8a8e095d75593b2834e4ea47d3e9b913a5e293ea0c
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/4f8fb83b6c854a72cd242e8a8e095d75593b2834e4ea47d3e9b913a5e293ea0c/
Verdict:
Malicious
Threat:
Family.MIRAI
Link:
https://tip.neiki.dev/file/4f8fb83b6c854a72cd242e8a8e095d75593b2834e4ea47d3e9b913a5e293ea0c
Threat name:
Linux.Backdoor.Mirai
Create hunting rule
Status:
Malicious
First seen:
2026-01-10 05:00:05 UTC
File Type:
ELF32 Little (Exe)
AV detection:
19 of 38 (50.00%)
Threat level:
  5/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=j6h3qo3mqvfhftjef2fi4ck5ovmtwkbu4tvepu7jxej2lyut5iga._file
Result
Malware family:
mirai
Create hunting rule
Score:
  10/10
Tags:
family:mirai
Link:
https://tria.ge/reports/260110-hbgprafz8f/
Verdict:
Malicious
Tags:
Unix.Trojan.Mirai-10001386-0
YARA:
n/a
Link:
https://app.threat.zone/submission/6aee28bc-f86b-40df-8e6f-f4de6cc276c8
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/4f8fb83b6c854a72cd242e8a8e095d75593b2834e4ea47d3e9b913a5e293ea0c

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_irc_catcher
Create hunting rule
Author:@_lubiedo
Description:Find new ELF IRC samples
Rule name:Linux_Generic_Threat_d94e1020
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 4f8fb83b6c854a72cd242e8a8e095d75593b2834e4ea47d3e9b913a5e293ea0c

(this sample)

  
URLhaus
https://urlhaus.abuse.ch/url/3749721/
  
Delivery method
Distributed via web download

Comments