MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 ef95d9a07ed4c15f062f6730970876a57228154730f826c7039b931a0415cb5a. 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: 13


Intelligence 13 IOCs YARA 13 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: ef95d9a07ed4c15f062f6730970876a57228154730f826c7039b931a0415cb5a
SHA3-384 hash: 4f341ad2c3c1c6c5383d4d4aa055a64f6c0eb5fbe81ee3b0c36da7a67e6ac94722b2151cb10cd968c2f1ce54eb91fd69
SHA1 hash: fc0b64687f361aca9219337bb175d386595c1be7
MD5 hash: 2a001cf7f7ab5c6414c3f17b652be0f4
humanhash: earth-delta-carolina-monkey
File name:x86_64.kokz
Download: download sample
Signature Mirai
Create hunting rule
File size:95'888 bytes
First seen:2026-01-03 18:32:40 UTC
Last seen:Never
File type: elf
MIME type:application/x-executable
ssdeep 1536:Hem1Vy0ZTb8M94VbHQd5qKV51JXNIkEvba5sk4XgaftzTb:HNfZXubwd5qu1JXGbba5sb5tzT
TLSH T180938E02BAC0D8FCC859C278969F7276D962F42D1235B25B53D0FE167D9EE103B2E291
telfhash t1ab3135b53c99254851ebbab6f30bf2a5ed3319601de131b2ae3768f2cf597144d22812
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 :
43
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-10017351-0
Create hunting rule

Result
Verdict:
Malware
Maliciousness:

Behaviour
Changes access rights for a written file
Attempts to kill processes by name
Connection attempt
Runs as daemon
Kills processes
Opens a port
Launching a process
Sends data to a server
Creating a process from a recently created file
Creating a file
Deleting a recently created file
Deletes a file
Changes the time when the file was created, accessed, or modified
Receives data from a server
Sets a written file as executable
Substitutes an application name
Writes files to system directory
Creates or modifies files in /cron to set up autorun
Creates or modifies files in /init.d to set up autorun
Creates or modifies symbolic links in /init.d to set up autorun
Creates or modifies files to set up autorun
Verdict:
Unknown
Threat level:
  0/10
Confidence:
100%
Tags:
masquerade
Link:
https://www.filescan.io/uploads/695960f02fb7bb52ca860927/reports/b864f1de-329e-4c1f-b95f-bf22750e540e/overview
Verdict:
Malicious
File Type:
elf.64.le
First seen:
2026-01-03T15:39:00Z UTC
Last seen:
2026-01-04T01:46:00Z UTC
Hits:
~10
Detections:
HEUR:Backdoor.Linux.Mirai.b
Link:
https://opentip.kaspersky.com/ef95d9a07ed4c15f062f6730970876a57228154730f826c7039b931a0415cb5a/results?tab=lookup
Verdict:
Malicious
Link:
https://analyze.intezer.com/analyses/47690087-fef4-4888-bf6f-58c7735cc0a2
Result
Threat name:
n/a
Detection:
malicious
Classification:
spre.troj.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/1844263
Signature
Drops files in suspicious directories
Drops invisible ELF files
Executes the "crontab" command typically for achieving persistence
Malicious sample detected (through community Yara rule)
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 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 signatures2 2 Behavior Graph ID: 1844263 Sample: x86_64.kokz.elf Startdate: 03/01/2026 Architecture: LINUX Score: 100 99 Malicious sample detected (through community Yara rule) 2->99 101 Multi AV Scanner detection for submitted file 2->101 10 x86_64.kokz.elf 2->10         started        process3 signatures4 105 Sample tries to kill multiple processes (SIGKILL) 10->105 107 Sample reads /proc/mounts (often used for finding a writable filesystem) 10->107 13 x86_64.kokz.elf 10->13         started        process5 file6 91 /var/spool/cron/root, ASCII 13->91 dropped 93 /var/spool/cron/crontabs/root, ASCII 13->93 dropped 95 /root/.bashrc, ASCII 13->95 dropped 97 11 other files (10 malicious) 13->97 dropped 125 Sample tries to set files in /etc globally writable 13->125 127 Sample tries to persist itself using /etc/profile 13->127 129 Drops files in suspicious directories 13->129 131 4 other signatures 13->131 17 x86_64.kokz.elf sh 13->17         started        19 x86_64.kokz.elf sh 13->19         started        21 x86_64.kokz.elf sh 13->21         started        23 87 other processes 13->23 signatures7 process8 signatures9 26 sh .monitor 17->26         started        28 sh cp 19->28         started        32 sh crontab 21->32         started        34 sh 21->34         started        103 Sample tries to kill multiple processes (SIGKILL) 23->103 36 sh S99backup0 23->36         started        38 sh S99backup2 23->38         started        40 sh S99network 23->40         started        42 84 other processes 23->42 process10 file11 44 .monitor 26->44         started        81 /usr/bin/.update, ELF 28->81 dropped 109 Writes identical ELF files to multiple locations 28->109 111 Drops invisible ELF files 28->111 113 Drops files in suspicious directories 28->113 83 /var/spool/cron/crontabs/tmp.U6A2NB, ASCII 32->83 dropped 115 Sample tries to persist itself using cron 32->115 117 Executes the "crontab" command typically for achieving persistence 32->117 46 sh crontab 34->46         started        49 S99backup0 36->49         started        51 S99backup2 38->51         started        53 S99network 40->53         started        85 /var/log/.update, ELF 42->85 dropped 87 /var/jbx/shared/.update, ELF 42->87 dropped 89 /boot/.update, ELF 42->89 dropped 119 Sample tries to kill multiple processes (SIGKILL) 42->119 121 Sample deletes itself 42->121 123 Terminates several processes with shell command 'killall' 42->123 55 S99backup1 42->55         started        57 sh .update 42->57         started        59 sh .update 42->59         started        61 2 other processes 42->61 signatures12 process13 signatures14 71 112 other processes 44->71 133 Executes the "crontab" command typically for achieving persistence 46->133 63 S99backup0 .update 49->63         started        73 23 other processes 49->73 65 S99backup2 .update 51->65         started        75 23 other processes 51->75 67 S99network .update 53->67         started        77 23 other processes 53->77 69 S99backup1 .update 55->69         started        79 23 other processes 55->79 process15
Score:
100%
Verdict:
Malware
File Type:
ELF
Link:
https://malprob.io/report/ef95d9a07ed4c15f062f6730970876a57228154730f826c7039b931a0415cb5a
Detection:
mirai
Create hunting rule
Link:
https://mwdb.cert.pl/sample/ef95d9a07ed4c15f062f6730970876a57228154730f826c7039b931a0415cb5a/
Verdict:
Malicious
Threat:
Family.MIRAI
Link:
https://tip.neiki.dev/file/ef95d9a07ed4c15f062f6730970876a57228154730f826c7039b931a0415cb5a
Threat name:
Linux.Worm.Mirai
Create hunting rule
Status:
Malicious
First seen:
2026-01-03 19:20:49 UTC
AV detection:
18 of 38 (47.37%)
Threat level:
  5/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=56k5tid62tav6brpm4yjocdwuvzcqfkhgd4cnrydtojrubavznna._file
Result
Malware family:
mirai
Create hunting rule
Score:
  10/10
Tags:
family:mirai botnet defense_evasion discovery execution linux persistence privilege_escalation
Link:
https://tria.ge/reports/260103-w64pnatphv/
Behaviour
Reads runtime system information
Writes file to shm directory
Changes its process name
Modifies Bash startup script
Creates a large amount of network flows
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
Mirai
Mirai family
Verdict:
Malicious
Tags:
trojan gafgyt mirai Unix.Trojan.Mirai-7640640-0
YARA:
Linux_Trojan_Gafgyt_9e9530a7 Linux_Trojan_Gafgyt_807911a2 Linux_Trojan_Gafgyt_d4227dbf Linux_Trojan_Gafgyt_d996d335 Linux_Trojan_Gafgyt_620087b9 Linux_Trojan_Gafgyt_33b4111a Linux_Trojan_Mirai_6a77af0f Linux_Trojan_Mirai_e0cf29e2
Link:
https://app.threat.zone/submission/0bef956b-faaf-49b2-ac0e-1279729182fc
Malware family:
Mirai
Create hunting rule
Verdict:
Malicious
Link:
https://www.vmray.com/analyses/_mb/ef95d9a07ed4/report/overview.html
Please note that we are no longer able to provide a coverage score for Virus Total.
Threat name:
Suspicious File
Score:
0.64
Link:
https://yomi.yoroi.company/submissions/ef95d9a07ed4c15f062f6730970876a57228154730f826c7039b931a0415cb5a

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: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_ipv6_catcher
Create hunting rule
Author:@_lubiedo
Description:ELF samples using IPv6 addresses
Rule name:Linux_Trojan_Gafgyt_33b4111a
Create hunting rule
Author:Elastic Security
Rule name:Linux_Trojan_Gafgyt_620087b9
Create hunting rule
Author:Elastic Security
Rule name:Linux_Trojan_Gafgyt_807911a2
Create hunting rule
Author:Elastic Security
Rule name:Linux_Trojan_Gafgyt_9e9530a7
Create hunting rule
Author:Elastic Security
Rule name:Linux_Trojan_Gafgyt_d4227dbf
Create hunting rule
Author:Elastic Security
Rule name:Linux_Trojan_Gafgyt_d996d335
Create hunting rule
Author:Elastic Security
Rule name:Linux_Trojan_Mirai_6a77af0f
Create hunting rule
Author:Elastic Security
Rule name:Linux_Trojan_Mirai_e0cf29e2
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 ef95d9a07ed4c15f062f6730970876a57228154730f826c7039b931a0415cb5a

(this sample)

  
URLhaus
https://urlhaus.abuse.ch/url/3749720/
  
Delivery method
Distributed via web download

Comments