MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 b4acd870a0c58c3e0e8639cf73b5ade6e1249fe063654b08d34a7d7339eee973. 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: b4acd870a0c58c3e0e8639cf73b5ade6e1249fe063654b08d34a7d7339eee973
SHA3-384 hash: 7bdf89f403681249d3233cb5fdd4daa2dca00033f47c482d7a2035a379b1464c1352801d2eb26f53313b61dc978b25f4
SHA1 hash: f758ec3fd90f14243bed71bf7412a3b81a0e3599
MD5 hash: ce9fc36e4eb6ba11cca7aa92dd58d337
humanhash: island-whiskey-zulu-ten
File name:x86_64.kokz
Download: download sample
Signature Mirai
Create hunting rule
File size:96'080 bytes
First seen:2026-01-10 00:57:09 UTC
Last seen:Never
File type: elf
MIME type:application/x-executable
ssdeep 1536:BnOl6W9azA+436c4ROz3qmij1GmvPuzf/ZOD+WdvvkCe:BeF9asD3J8y3qF1GmHiZODRdHkCe
TLSH T139937C06B7C0DCFDC45AD278529EB275C462F42D2231721B93D0FE1A6D9EE113B2E295
telfhash t18e3133743aca292452f7a735f32af454ec221e600ce235e4df379ce2cb667881c91455
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 :
55
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
Creates or modifies files in /cron to set up autorun
Substitutes an application name
Writes files to system directory
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:
Malicious
Threat level:
  10/10
Confidence:
100%
Tags:
gafgyt masquerade mirai
Link:
https://www.filescan.io/uploads/6961a3f91a20a4c87b1a399e/reports/a1b8e275-a7fa-4884-b66e-de497cc01117/overview
Verdict:
Malicious
File Type:
elf.64.le
First seen:
2026-01-09T18:24:00Z UTC
Last seen:
2026-01-09T22:55:00Z UTC
Hits:
~10
Detections:
HEUR:Backdoor.Linux.Mirai.b
Link:
https://opentip.kaspersky.com/b4acd870a0c58c3e0e8639cf73b5ade6e1249fe063654b08d34a7d7339eee973/results?tab=lookup
Verdict:
Malicious
Link:
https://analyze.intezer.com/analyses/32ce4dd3-2c52-441c-a885-3e2fd6d77c9f
Result
Threat name:
n/a
Detection:
malicious
Classification:
spre.troj.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/1847748
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: 1847748 Sample: x86_64.kokz.elf Startdate: 10/01/2026 Architecture: LINUX Score: 100 97 Malicious sample detected (through community Yara rule) 2->97 99 Multi AV Scanner detection for submitted file 2->99 10 x86_64.kokz.elf 2->10         started        process3 signatures4 103 Sample tries to kill multiple processes (SIGKILL) 10->103 105 Sample reads /proc/mounts (often used for finding a writable filesystem) 10->105 13 x86_64.kokz.elf 10->13         started        process5 file6 89 /var/spool/cron/root, ASCII 13->89 dropped 91 /var/spool/cron/crontabs/root, ASCII 13->91 dropped 93 /root/.bashrc, ASCII 13->93 dropped 95 11 other files (10 malicious) 13->95 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 85 other processes 13->23 signatures7 process8 signatures9 26 sh cp 17->26         started        30 sh crontab 19->30         started        32 sh 19->32         started        34 sh cp 21->34         started        101 Sample tries to kill multiple processes (SIGKILL) 23->101 36 sh S99backup0 23->36         started        38 sh S99backup1 23->38         started        40 sh S99backup2 23->40         started        42 83 other processes 23->42 process10 file11 79 /usr/bin/.update, ELF 26->79 dropped 107 Writes identical ELF files to multiple locations 26->107 109 Drops invisible ELF files 26->109 111 Drops files in suspicious directories 26->111 81 /var/spool/cron/crontabs/tmp.yGTlAw, ASCII 30->81 dropped 113 Sample tries to persist itself using cron 30->113 115 Executes the "crontab" command typically for achieving persistence 30->115 44 sh crontab 32->44         started        83 /boot/.update, ELF 34->83 dropped 47 S99backup0 36->47         started        49 S99backup1 38->49         started        51 S99backup2 40->51         started        85 /var/log/.update, ELF 42->85 dropped 87 /var/jbx/shared/.update, ELF 42->87 dropped 117 Sample tries to kill multiple processes (SIGKILL) 42->117 119 Sample deletes itself 42->119 121 Terminates several processes with shell command 'killall' 42->121 53 S99network 42->53         started        55 .monitor 42->55         started        57 sh .update 42->57         started        59 3 other processes 42->59 signatures12 process13 signatures14 123 Executes the "crontab" command typically for achieving persistence 44->123 61 S99backup0 .update 47->61         started        69 27 other processes 47->69 63 S99backup1 .update 49->63         started        71 27 other processes 49->71 65 S99backup2 .update 51->65         started        73 27 other processes 51->73 67 S99network .update 53->67         started        75 27 other processes 53->75 77 2 other processes 55->77 process15
Score:
100%
Verdict:
Malware
File Type:
ELF
Link:
https://malprob.io/report/b4acd870a0c58c3e0e8639cf73b5ade6e1249fe063654b08d34a7d7339eee973
Detection:
mirai
Create hunting rule
Link:
https://mwdb.cert.pl/sample/b4acd870a0c58c3e0e8639cf73b5ade6e1249fe063654b08d34a7d7339eee973/
Verdict:
Malicious
Threat:
Family.MIRAI
Link:
https://tip.neiki.dev/file/b4acd870a0c58c3e0e8639cf73b5ade6e1249fe063654b08d34a7d7339eee973
Threat name:
Linux.Worm.Mirai
Create hunting rule
Status:
Malicious
First seen:
2026-01-10 00:41:36 UTC
File Type:
ELF64 Little (Exe)
AV detection:
11 of 36 (30.56%)
Threat level:
  5/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=wswnq4faywgd4dughhhxhnnn43qsjh7amnsuwcgtjj6xgopo5fzq._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/260110-ba8crahz3d/
Behaviour
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
Mirai
Mirai family
Verdict:
Malicious
Tags:
trojan mirai gafgyt 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/058ed93f-d1e5-45dd-aaae-411694c68683
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/b4acd870a0c58c3e0e8639cf73b5ade6e1249fe063654b08d34a7d7339eee973

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 b4acd870a0c58c3e0e8639cf73b5ade6e1249fe063654b08d34a7d7339eee973

(this sample)

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

Comments