MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 873687b0875f9454484ecddf75cd5ca42d45372ee89fd6f334f828ff48ee117a. 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 14 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: 873687b0875f9454484ecddf75cd5ca42d45372ee89fd6f334f828ff48ee117a
SHA3-384 hash: de757f80820ebeac273d1f93e0728b2e94c0c372d85aa6129c3d6004200788897db547fdbe4c838f42f9c0bdfd8cf810
SHA1 hash: 758f72663b46d54ef6c0b2413974c893d7956b0c
MD5 hash: 8ddaf761594061a74fb9f42109c190a2
humanhash: north-glucose-cat-summer
File name:x86_64.kok
Download: download sample
Signature Mirai
Create hunting rule
File size:97'840 bytes
First seen:2026-01-13 19:36:35 UTC
Last seen:Never
File type: elf
MIME type:application/x-executable
ssdeep 1536:LQZKDQnYG9TxGH4CkEfujFvqpg41zzVPOT/j+HQDsoO0STQ:LH69FGH4auhvqn1zzx++HQwvTQ
TLSH T130A36C42BAC088FDC456C275465EB2B6D461F51E2232325F57C0FE267D9EE223B1E2D2
telfhash t17a3138742d993da421db5739b307e2e59862193016f272e49e3ba9f3cf077d40da10d2
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 :
44
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

Verdict:
Likely Malicious
Threat level:
  7.5/10
Confidence:
100%
Tags:
masquerade mirai
Link:
https://www.filescan.io/uploads/69669ef460d1ef876dee3c1b/reports/c9e47af9-698c-4d36-8b58-9bbcce756c6b/overview
Result
Gathering data
Verdict:
Malicious
Link:
https://analyze.intezer.com/analyses/d3b73737-454a-45e6-818c-a09be6ca3f62
Result
Threat name:
n/a
Detection:
malicious
Classification:
spre.troj.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/1850169
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 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: 1850169 Sample: x86_64.kok.elf Startdate: 13/01/2026 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->108 110 Malicious sample detected (through community Yara rule) 2->110 112 Multi AV Scanner detection for submitted file 2->112 11 x86_64.kok.elf 2->11         started        14 unknown .update 2->14         started        16 dash rm 2->16         started        18 dash rm 2->18         started        signatures3 process4 signatures5 122 Sample tries to kill multiple processes (SIGKILL) 11->122 124 Sample reads /proc/mounts (often used for finding a writable filesystem) 11->124 20 x86_64.kok.elf 11->20         started        process6 file7 86 /var/spool/cron/root, ASCII 20->86 dropped 88 /var/spool/cron/crontabs/root, ASCII 20->88 dropped 90 /root/.bashrc, ASCII 20->90 dropped 92 11 other files (10 malicious) 20->92 dropped 114 Sample tries to set files in /etc globally writable 20->114 116 Sample tries to persist itself using /etc/profile 20->116 118 Drops files in suspicious directories 20->118 120 4 other signatures 20->120 24 x86_64.kok.elf sh 20->24         started        26 x86_64.kok.elf sh 20->26         started        28 x86_64.kok.elf sh 20->28         started        30 21 other processes 20->30 signatures8 process9 signatures10 33 sh .monitor 24->33         started        35 sh S99backup0 26->35         started        37 sh S99backup1 28->37         started        142 Sample tries to kill a massive number of system processes 30->142 144 Sample tries to kill multiple processes (SIGKILL) 30->144 39 sh S99backup2 30->39         started        41 sh S99network 30->41         started        43 sh cp 30->43         started        47 20 other processes 30->47 process11 file12 49 .monitor 33->49         started        51 S99backup0 35->51         started        53 S99backup1 37->53         started        55 S99backup2 39->55         started        57 S99network 41->57         started        94 /usr/bin/.update, ELF 43->94 dropped 128 Writes identical ELF files to multiple locations 43->128 130 Drops invisible ELF files 43->130 132 Drops files in suspicious directories 43->132 96 /var/spool/cron/crontabs/tmp.J1TLOE, ASCII 47->96 dropped 98 /var/log/.update, ELF 47->98 dropped 100 /var/jbx/shared/.update, ELF 47->100 dropped 102 /boot/.update, ELF 47->102 dropped 134 Sample deletes itself 47->134 136 Sample tries to persist itself using cron 47->136 138 Executes the "crontab" command typically for achieving persistence 47->138 140 Terminates several processes with shell command 'killall' 47->140 59 sh crontab 47->59         started        62 sh .update 47->62         started        64 sh .update 47->64         started        66 sh .update 47->66         started        signatures13 process14 signatures15 76 72 other processes 49->76 68 S99backup0 .update 51->68         started        78 65 other processes 51->78 70 S99backup1 .update 53->70         started        80 61 other processes 53->80 72 S99backup2 .update 55->72         started        82 61 other processes 55->82 74 S99network .update 57->74         started        84 57 other processes 57->84 126 Executes the "crontab" command typically for achieving persistence 59->126 process16
Score:
100%
Verdict:
Malware
File Type:
ELF
Link:
https://malprob.io/report/873687b0875f9454484ecddf75cd5ca42d45372ee89fd6f334f828ff48ee117a
Detection:
mirai
Create hunting rule
Link:
https://mwdb.cert.pl/sample/873687b0875f9454484ecddf75cd5ca42d45372ee89fd6f334f828ff48ee117a/
Verdict:
Malicious
Threat:
Family.MIRAI
Link:
https://tip.neiki.dev/file/873687b0875f9454484ecddf75cd5ca42d45372ee89fd6f334f828ff48ee117a
Threat name:
Linux.Worm.Mirai
Create hunting rule
Status:
Malicious
First seen:
2026-01-13 19:37:26 UTC
File Type:
ELF64 Little (Exe)
AV detection:
8 of 36 (22.22%)
Threat level:
  5/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=q43ipmehl6kfiscozxpxltk4uqwuknzo5cp5n4zu7aup6shocf5a._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/260113-yb1evshs3e/
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
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/efa456d5-3a03-483c-8e67-4c6792c91aba
Malware family:
Mirai
Create hunting rule
Verdict:
Malicious
Link:
https://www.vmray.com/analyses/_mb/873687b0875f/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/873687b0875f9454484ecddf75cd5ca42d45372ee89fd6f334f828ff48ee117a

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_generic_irc_catcher
Create hunting rule
Author:@_lubiedo
Description:Find new ELF IRC samples
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 873687b0875f9454484ecddf75cd5ca42d45372ee89fd6f334f828ff48ee117a

(this sample)

  
URLhaus
https://urlhaus.abuse.ch/url/3749718/
  
Delivery method
Distributed via web download

Comments