MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 bf23faf4440b3ecf07ebc99d4961bae4274a68c0ee8bb35f1936fcb80284ef47. 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: 6


Intelligence 6 IOCs YARA 7 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: bf23faf4440b3ecf07ebc99d4961bae4274a68c0ee8bb35f1936fcb80284ef47
SHA3-384 hash: 216811c7352e6167b089e360eb8a4ffd3a79936b419c14aa71f87d9117625e65f2c39abd4aa6a82d76ec7bc7a203f323
SHA1 hash: 00eaeead4afaaa1465db24367ffcd83e0a647167
MD5 hash: a736c0b9128212df18b435bc4d8556c9
humanhash: connecticut-solar-four-finch
File name:kworkerd-blkcg
Download: download sample
Signature Mirai
Create hunting rule
File size:265'772 bytes
First seen:2026-06-27 17:27:42 UTC
Last seen:2026-06-27 23:45:33 UTC
File type: elf
MIME type:application/x-executable
ssdeep 6144:Zy9dw+Q+l4FXeFutEV4EU1NvF7AGgp/LaRSQaeo85kYv9qrEiwoo4QnVe:kDIXeFutE+zhBA/LaRHaeLkYv9qIso4C
TLSH T15F442819BE409F02C5D126FAFAAE829933577BB8D3EE7112E9145F64338A48F0F67141
telfhash t10ed022951a4741e9f70b2a0040cf23215badc0777b3a71c024d28ebe5e2313140bbba2
Magika elf
Reporter abuse_ch
Tags:elf mirai

Intelligence

File Origin
# of uploads :
4
# of downloads :
63
Origin country :
DE DE
Vendor Threat Intelligence
No detections
Detection(s):
SecuriteInfo.com.Linux.Siggen.13227.13073.3245.UNOFFICIAL
Create hunting rule

Result
Verdict:
Malware
Maliciousness:

Behaviour
DNS request
Opens a port
Collects information on the CPU
Creating a file in the %temp% directory
Changes access rights for a written file
Creating a file
Sends data to a server
Connection attempt
Receives data from a server
Runs as daemon
Sets a written file as executable
Changes the time when the file was created, accessed, or modified
Launching a process
Manages services
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
Deleting of the original file
Verdict:
Malicious
Uses P2P?:
false
Uses anti-vm?:
true
Architecture:
arm
Packer:
not packed
Botnet:
unknown
Number of open files:
139
Number of processes launched:
7
Processes remaning?
true
Remote TCP ports scanned:
not identified
Full report:
https://elfdigest.com/brief/bf23faf4440b3ecf07ebc99d4961bae4274a68c0ee8bb35f1936fcb80284ef47
Behaviour
Anti-VM
Persistence
Process Renaming
Botnet C2s
TCP botnet C2(s):
not identified
UDP botnet C2(s):
not identified
Status:
terminated
Link:
https://sandbox.kunai.rocks/analysis/b30532fb-2eb2-473c-a2b2-80d84f1aa022
Behavior Graph:
Download SVG
%3 guuid=1227c531-1f00-0000-03fd-370052120000 pid=4690 /usr/bin/sudo guuid=6514e434-1f00-0000-03fd-37005b120000 pid=4699 /tmp/sample.bin guuid=1227c531-1f00-0000-03fd-370052120000 pid=4690->guuid=6514e434-1f00-0000-03fd-37005b120000 pid=4699 execve
Verdict:
Suspicious
Link:
https://analyze.intezer.com/analyses/a55e5e2f-9d09-4d16-9f16-a1ad6160b26a
Result
Threat name:
Mirai, Xmrig
Create hunting rule
Detection:
malicious
Classification:
troj.spyw.evad.mine
Score:
84 / 100
Link:
https://www.joesandbox.com/analysis/1934496
Signature
Executes itself again with its parent PID as an argument (indicative of hampering debugging)
Executes the "crontab" command typically for achieving persistence
Found strings related to Crypto-Mining
Opens /sys/class/net/* files useful for querying network interface information
Performs DNS TXT record lookups
Sample deletes itself
Sample tries to persist itself using cron
Yara detected Mirai
Yara detected Xmrig cryptocurrency miner
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 dnsIp2 2 Behavior Graph ID: 1934496 Sample: kworkerd-blkcg.elf Startdate: 27/06/2026 Architecture: LINUX Score: 84 54 nzr.narxzz.biz.id 2->54 56 nzr.narxzz.biz.id 103.253.212.175, 34956, 6868 CRI-AS-APCVRumahwebIndonesiaID Indonesia 2->56 58 2 other IPs or domains 2->58 60 Yara detected Mirai 2->60 62 Yara detected Xmrig cryptocurrency miner 2->62 10 kworkerd-blkcg.elf 2->10         started        13 systemd sh 2->13         started        15 systemd snapd-env-generator 2->15         started        17 systemd snapd-env-generator 2->17         started        signatures3 64 Performs DNS TXT record lookups 54->64 process4 signatures5 70 Found strings related to Crypto-Mining 10->70 19 kworkerd-blkcg.elf 10->19         started        21 sh wget 13->21         started        23 sh sh 13->23         started        25 sh rm 13->25         started        process6 process7 27 kworkerd-blkcg.elf 19->27         started        file8 52 /var/spool/cron/crontabs/root, ASCII 27->52 dropped 72 Opens /sys/class/net/* files useful for querying network interface information 27->72 74 Sample deletes itself 27->74 76 Sample tries to persist itself using cron 27->76 31 kworkerd-blkcg.elf sh 27->31         started        34 kworkerd-blkcg.elf sh 27->34         started        36 kworkerd-blkcg.elf sh 27->36         started        38 kworkerd-blkcg.elf sh 27->38         started        signatures9 process10 signatures11 78 Executes itself again with its parent PID as an argument (indicative of hampering debugging) 31->78 40 sh crontab 31->40         started        44 sh crontab 34->44         started        46 sh systemctl 36->46         started        48 sh systemctl 38->48         started        process12 file13 50 /var/spool/cron/crontabs/tmp.unCCTn, ASCII 40->50 dropped 66 Sample tries to persist itself using cron 40->66 68 Executes the "crontab" command typically for achieving persistence 40->68 signatures14
Score:
100%
Verdict:
Malware
File Type:
ELF
Link:
https://malprob.io/report/bf23faf4440b3ecf07ebc99d4961bae4274a68c0ee8bb35f1936fcb80284ef47
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/bf23faf4440b3ecf07ebc99d4961bae4274a68c0ee8bb35f1936fcb80284ef47/
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=x4r7v5cebm7m6b7lzgousyn24qtuu2ga52f3gxyzg36lqaue55dq._file
Result
Malware family:
n/a
Score:
  7/10
Tags:
antivm defense_evasion discovery execution persistence privilege_escalation
Link:
https://tria.ge/reports/260627-v2aekscw4q/
Behaviour
Command and Scripting Interpreter: Unix Shell
Enumerates kernel/hardware configuration
Reads runtime system information
Writes file to tmp directory
Changes its process name
Checks CPU configuration
Reads system network configuration
Creates/modifies Cron job
Enumerates active TCP sockets
Enumerates running processes
Modifies systemd
Reads MAC address of network interface
Deletes itself
Modifies Watchdog functionality
Unexpected DNS network traffic destination
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/bf23faf4440b3ecf07ebc99d4961bae4274a68c0ee8bb35f1936fcb80284ef47

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_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:RIPEMD160_Constants
Create hunting rule
Author:phoul (@phoul)
Description:Look for RIPEMD-160 constants
Rule name:SHA1_Constants
Create hunting rule
Author:phoul (@phoul)
Description:Look for SHA1 constants
Rule name:TH_Generic_MassHunt_Linux_Malware_2026_CYFARE
Create hunting rule
Author:CYFARE
Description:Generic Linux malware mass-hunt rule - 2026
Reference:https://cyfare.net/
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 bf23faf4440b3ecf07ebc99d4961bae4274a68c0ee8bb35f1936fcb80284ef47

(this sample)

  
URLhaus
https://urlhaus.abuse.ch/url/3876983/
  
Delivery method
Distributed via web download

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