MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 4dc47959cb6437a9de370647fcc8bc63c2882def695e008536b539152acd103c. 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: 7


Intelligence 7 IOCs YARA 4 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: 4dc47959cb6437a9de370647fcc8bc63c2882def695e008536b539152acd103c
SHA3-384 hash: 3d5af6e027bf1dd39073bdf752421b2cd4f01cb8419aae81efec4c06f9419d5f46d9e9af0d45f17511abaf4f57bc73e2
SHA1 hash: 4435c18465ec0dc7fbf3ef41aa6bc038473bc71b
MD5 hash: 7421638659b5dcfebf10a8a2b6ae7c71
humanhash: neptune-fifteen-edward-indigo
File name:kworkerd-rcu
Download: download sample
Signature Mirai
Create hunting rule
File size:403'876 bytes
First seen:2026-07-08 01:25:41 UTC
Last seen:2026-07-08 20:35:37 UTC
File type: elf
MIME type:application/x-executable
ssdeep 6144:F7nSu4LTS7cnSvChIZtwFcfFyni9GTfnrdeXNBb7WpvGeDHG6ydmljryvDiHa4O:NSugS6LF74GXdGNleVmvmlSvDiHa4
TLSH T1EB84235BB102F80AD84D58F238A3C6293D887F1E67632E08D175E9BC3B495FF5491A9C
Magika elf
Reporter abuse_ch
Tags:elf mirai

Intelligence

File Origin
# of uploads :
5
# of downloads :
64
Origin country :
DE DE
Vendor Threat Intelligence
No detections
Detection(s):
SecuriteInfo.com.Linux.Siggen.13369.2295.27930.UNOFFICIAL
Create hunting rule

Result
Verdict:
Malware
Maliciousness:

Behaviour
Runs as daemon
Sends data to a server
Manages services
Sets a written file as executable
Creating a file in the %temp% directory
Receives data from a server
Deleting a recently created file
Launching a process
Creating a process from a recently created file
Connection attempt
Creating a file
Collects information on the CPU
Changes the time when the file was created, accessed, or modified
Opens a port
Kills processes
Changes access rights for a written file
Substitutes an application name
Creates or modifies files in /cron to set up autorun
Verdict:
Unknown
Threat level:
  0/10
Confidence:
100%
Tags:
gcc
Link:
https://www.filescan.io/uploads/6a4da741cf1587cc995ba451/reports/183f128d-05fe-4ec5-8da1-019fdd8ad2b4/overview
Verdict:
Malicious
File Type:
elf.32.le
First seen:
2026-07-07T17:02:00Z UTC
Last seen:
2026-07-09T05:09:00Z UTC
Hits:
~10
Link:
https://opentip.kaspersky.com/4dc47959cb6437a9de370647fcc8bc63c2882def695e008536b539152acd103c/results?tab=lookup
Status:
terminated
Link:
https://sandbox.kunai.rocks/analysis/48588625-1889-44f3-a456-79ae48fffe6e
Behavior Graph:
Download SVG
%3 guuid=e8d1d659-1b00-0000-b9dc-3f8d810b0000 pid=2945 /usr/bin/sudo guuid=bbeebd5b-1b00-0000-b9dc-3f8d860b0000 pid=2950 /tmp/sample.bin guuid=e8d1d659-1b00-0000-b9dc-3f8d810b0000 pid=2945->guuid=bbeebd5b-1b00-0000-b9dc-3f8d860b0000 pid=2950 execve
Verdict:
Unknown
Link:
https://analyze.intezer.com/analyses/bb3c966c-8b48-445d-9fb4-58639cbcead4
Result
Threat name:
Mirai, Xmrig
Create hunting rule
Detection:
malicious
Classification:
troj.spyw.evad.mine
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/1938987
Signature
Antivirus detection for dropped file
Drops invisible ELF files
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
Malicious sample detected (through community Yara rule)
Opens /sys/class/net/* files useful for querying network interface information
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: 1938987 Sample: kworkerd-rcu.elf Startdate: 08/07/2026 Architecture: LINUX Score: 100 75 91.92.40.118, 443, 53524, 53526 TODYL-CLOUD-TodylIncUS Bulgaria 2->75 79 Malicious sample detected (through community Yara rule) 2->79 81 Antivirus detection for dropped file 2->81 83 Yara detected Mirai 2->83 85 Yara detected Xmrig cryptocurrency miner 2->85 11 kworkerd-rcu.elf 2->11         started        15 systemd sh 2->15         started        17 systemd snapd-env-generator 2->17         started        19 systemd snapd-env-generator 2->19         started        signatures3 process4 file5 73 /tmp/.5508, ELF 11->73 dropped 95 Drops invisible ELF files 11->95 97 Sample deletes itself 11->97 21 kworkerd-rcu.elf .5508 11->21         started        24 sh sh 15->24         started        26 sh wget 15->26         started        29 sh rm 15->29         started        signatures6 process7 file8 87 Found strings related to Crypto-Mining 21->87 31 .5508 21->31         started        33 sh wget 24->33         started        37 sh .k 24->37         started        39 sh chmod 24->39         started        71 /tmp/..redis-sentinel, POSIX 26->71 dropped signatures9 process10 file11 41 .5508 31->41         started        67 /tmp/.k, ELF 33->67 dropped 77 Drops invisible ELF files 33->77 44 .k 37->44         started        signatures12 process13 signatures14 89 Opens /sys/class/net/* files useful for querying network interface information 41->89 46 .5508 sh 41->46         started        49 .5508 sh 41->49         started        51 .5508 sh 41->51         started        53 .5508 sh 41->53         started        55 .k 44->55         started        process15 signatures16 99 Executes itself again with its parent PID as an argument (indicative of hampering debugging) 46->99 57 sh crontab 46->57         started        61 sh crontab 49->61         started        63 sh systemctl 51->63         started        65 sh systemctl 53->65         started        process17 file18 69 /var/spool/cron/crontabs/tmp.oIXvOe, ASCII 57->69 dropped 91 Sample tries to persist itself using cron 57->91 93 Executes the "crontab" command typically for achieving persistence 57->93 signatures19
Score:
100%
Verdict:
Malware
File Type:
ELF
Link:
https://malprob.io/report/4dc47959cb6437a9de370647fcc8bc63c2882def695e008536b539152acd103c
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/4dc47959cb6437a9de370647fcc8bc63c2882def695e008536b539152acd103c/
Threat name:
Linux.Trojan.Generic
Create hunting rule
Status:
Suspicious
First seen:
2026-07-07 20:06:59 UTC
File Type:
ELF32 Little (Exe)
AV detection:
5 of 24 (20.83%)
Threat level:
  5/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=jxchswolmq32txrxazd7zsf4mpbiqlppnfpabbjwwu4rkkwnca6a._file
Result
Malware family:
n/a
Score:
  7/10
Tags:
n/a
Link:
https://tria.ge/reports/260708-btql2shy2r/
Behaviour
Writes file to tmp directory
Executes dropped EXE
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/4dc47959cb6437a9de370647fcc8bc63c2882def695e008536b539152acd103c

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: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: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 4dc47959cb6437a9de370647fcc8bc63c2882def695e008536b539152acd103c

(this sample)

  
URLhaus
https://urlhaus.abuse.ch/url/3883717/
  
Delivery method
Distributed via web download

Comments