MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 a72cb33e43ae72204508cb79b97c8c194efdcfe56e1b56bec3eaf9af0d899b0e. 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


CoinMiner


Vendor detections: 7


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

SHA256 hash: a72cb33e43ae72204508cb79b97c8c194efdcfe56e1b56bec3eaf9af0d899b0e
SHA3-384 hash: 06feaed05971b664ab749048418f0b652892fb45e41f722a0e29051409e17815e7e7a47c35d33614ea357241f354af96
SHA1 hash: 2a77723f830a28c8c8fec44dbff9f7b4c7bd861d
MD5 hash: bafe8e9aa22a944277d4e5bfcec177f9
humanhash: river-pip-alpha-jupiter
File name:kworkerd-rcu
Download: download sample
Signature CoinMiner
Create hunting rule
File size:335'420 bytes
First seen:2026-06-26 07:38:38 UTC
Last seen:Never
File type: elf
MIME type:application/x-sharedlib
ssdeep 6144:2DpouIjIavEZCMEmP0KQjRKbK8N8J05kfIN38X10erQ+NrJ:uohEubOcfINsXLrQmrJ
TLSH T123644A4ADF750FFFC5AECE3052AE121715DE885A52FA6B3761BCCD08B256A0416E3C48
telfhash t1da41e984a83209ef7efb55008c642625c506e625f8b38f20ef18d6c1476842eb64ee4f
Magika elf
Reporter abuse_ch
Tags:CoinMiner elf upx-dec


Avatar
abuse_ch
UPX decompressed file, sourced from SHA256 4225c73c7a0f0cc9512662bff169b8a772044bc7f7a72b1b0e241f946af7f60a
File size (compressed) :133'820 bytes
File size (de-compressed) :335'420 bytes
Format:linux/mipsel
Packed file: 4225c73c7a0f0cc9512662bff169b8a772044bc7f7a72b1b0e241f946af7f60a

Intelligence

File Origin
# of uploads :
1
# of downloads :
73
Origin country :
NL NL
Vendor Threat Intelligence
No detections
Detection(s):
Unix.Trojan.Mirai-10058997-0
Create hunting rule

Result
Verdict:
Malware
Maliciousness:

Behaviour
Creating a file
DNS request
Changes the time when the file was created, accessed, or modified
Creating a file in the %temp% directory
Changes access rights for a written file
Sends data to a server
Collects information on the CPU
Receives data from a server
Sets a written file as executable
Opens a port
Connection attempt
Runs as daemon
Launching a process
Manages services
Creates or modifies files in /cron to set up autorun
Substitutes an application name
Deleting of the original file
Verdict:
Likely Malicious
Threat level:
  7.5/10
Confidence:
100%
Tags:
base64 gcc mirai
Link:
https://www.filescan.io/uploads/6a3e2cb3aae7206ae9e7d68d/reports/be0a114f-405d-4daf-9242-f36953f1ee83/overview
Status:
terminated
Link:
https://sandbox.kunai.rocks/analysis/9576150d-ef97-42ca-9169-ebab1a37c4e1
Behavior Graph:
Download SVG
%3 guuid=39209ae4-1e00-0000-898b-e6b23e140000 pid=5182 /usr/bin/sudo guuid=adc270e6-1e00-0000-898b-e6b240140000 pid=5184 /tmp/sample.bin guuid=39209ae4-1e00-0000-898b-e6b23e140000 pid=5182->guuid=adc270e6-1e00-0000-898b-e6b240140000 pid=5184 execve
Verdict:
Unknown
Link:
https://analyze.intezer.com/analyses/9b70e011-108d-4abe-a9d3-543262fb9fe4
Result
Threat name:
Xmrig
Create hunting rule
Detection:
malicious
Classification:
troj.spyw.evad.mine
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/1934084
Signature
Antivirus / Scanner detection for submitted sample
Antivirus detection for dropped file
Contains symbols with names commonly found in malware
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
Executes the "nc" (netcat) command used to establish arbitrary TCP or UDP connections and listens
Found strings related to Crypto-Mining
Multi AV Scanner detection for submitted file
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
Searches for CPU information (likely indicative of DDoS capability)
Yara detected Xmrig cryptocurrency miner
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 dnsIp2 2 Behavior Graph ID: 1934084 Sample: kworkerd-rcu.elf Startdate: 26/06/2026 Architecture: LINUX Score: 100 80 api.robotmarkethub.com 2->80 82 91.239.211.89, 47272, 60180, 60182 HOSTKEY-ASNL Germany 2->82 96 Antivirus detection for dropped file 2->96 98 Antivirus / Scanner detection for submitted sample 2->98 100 Multi AV Scanner detection for submitted file 2->100 104 2 other signatures 2->104 12 systemd sh 2->12         started        14 kworkerd-rcu.elf 2->14         started        17 systemd snapd-env-generator 2->17         started        19 systemd snapd-env-generator 2->19         started        signatures3 102 Performs DNS TXT record lookups 80->102 process4 signatures5 21 sh sh 12->21         started        24 sh wget 12->24         started        26 sh rm 12->26         started        116 Found strings related to Crypto-Mining 14->116 28 kworkerd-rcu.elf 14->28         started        process6 file7 76 /dev/shm/.exectest.5532, POSIX 21->76 dropped 30 sh .d 21->30         started        32 sh wget 21->32         started        36 sh 21->36         started        40 28 other processes 21->40 78 /tmp/..redis-sentinel, POSIX 24->78 dropped 38 kworkerd-rcu.elf 28->38         started        process8 file9 42 .d 30->42         started        70 /dev/shm/.d, ELF 32->70 dropped 84 Drops invisible ELF files 32->84 44 sh grep 36->44         started        47 kworkerd-rcu.elf sh 38->47         started        49 kworkerd-rcu.elf sh 38->49         started        86 Searches for CPU information (likely indicative of DDoS capability) 40->86 88 Sample deletes itself 40->88 90 Executes the "nc" (netcat) command used to establish arbitrary TCP or UDP connections and listens 40->90 signatures10 process11 signatures12 51 .d 42->51         started        114 Searches for CPU information (likely indicative of DDoS capability) 44->114 55 sh systemctl 47->55         started        57 sh systemctl 49->57         started        process13 file14 74 /var/spool/cron/crontabs/root, ASCII 51->74 dropped 106 Opens /sys/class/net/* files useful for querying network interface information 51->106 108 Sample deletes itself 51->108 110 Sample tries to persist itself using cron 51->110 59 .d sh 51->59         started        62 .d sh 51->62         started        signatures15 process16 signatures17 112 Executes itself again with its parent PID as an argument (indicative of hampering debugging) 59->112 64 sh crontab 59->64         started        68 sh crontab 62->68         started        process18 file19 72 /var/spool/cron/crontabs/tmp.9B1hzC, ASCII 64->72 dropped 92 Sample tries to persist itself using cron 64->92 94 Executes the "crontab" command typically for achieving persistence 64->94 signatures20
Score:
100%
Verdict:
Malware
File Type:
ELF
Link:
https://malprob.io/report/a72cb33e43ae72204508cb79b97c8c194efdcfe56e1b56bec3eaf9af0d899b0e
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/a72cb33e43ae72204508cb79b97c8c194efdcfe56e1b56bec3eaf9af0d899b0e/
Threat name:
Linux.Trojan.Generic
Create hunting rule
Status:
Suspicious
First seen:
2026-06-26 07:39:56 UTC
File Type:
ELF32 Little (SO)
AV detection:
6 of 36 (16.67%)
Threat level:
  5/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=u4wlgpsdvzzcariizn43s7emdfhp3t7fnynvnpwd5l426dmjtmha._file
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/a72cb33e43ae72204508cb79b97c8c194efdcfe56e1b56bec3eaf9af0d899b0e

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_arm_mips_ko_so
Create hunting rule
Rule name:enterpriseapps2
Create hunting rule
Author:Tim Brown @timb_machine
Description:Enterprise apps
Rule name:setsockopt
Create hunting rule
Author:Tim Brown @timb_machine
Description:Hunts for setsockopt() red flags
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

CoinMiner

elf 4225c73c7a0f0cc9512662bff169b8a772044bc7f7a72b1b0e241f946af7f60a

CoinMiner

elf a72cb33e43ae72204508cb79b97c8c194efdcfe56e1b56bec3eaf9af0d899b0e

(this sample)

  
Dropped by
SHA256 4225c73c7a0f0cc9512662bff169b8a772044bc7f7a72b1b0e241f946af7f60a
  
URLhaus
https://urlhaus.abuse.ch/url/3868021/
  
Delivery method
Distributed via web download
  
Dropped by
MD5 22f3c908d82b03797c724984404e584b

Comments