MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 ef801a4aaaadbcedd44a8d3568467769854752886ff63db6c4490618d2e76335. 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: 6


Intelligence 6 IOCs YARA 3 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: ef801a4aaaadbcedd44a8d3568467769854752886ff63db6c4490618d2e76335
SHA3-384 hash: e3965501724f60b0c8b1ea7b1310f48c04ad1fd5fd6f1df864431b47eb5b31c5fc68a47c6981663a76f49794b5104469
SHA1 hash: d3e411e9afc74385df92f0fe8a297c8a168d83d7
MD5 hash: 15047b5dc6be781346041c8744367deb
humanhash: jersey-black-artist-virginia
File name:kworkerd-cgroup
Download: download sample
Signature CoinMiner
Create hunting rule
File size:239'032 bytes
First seen:2026-06-25 18:11:18 UTC
Last seen:Never
File type: elf
MIME type:application/x-sharedlib
ssdeep 6144:XvBPd31jsIept4BCLeifaK87k5pYC8C9gt6Zz0j5qhc:XvrlsIeptCCaifN8ypo4eOz0j4hc
TLSH T121345B0AE612E5F0F5A75932018EC37B5A70ED344162D9A6FF4B3EB1EC71505AE1A32C
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:CoinMiner elf

Intelligence

File Origin
# of uploads :
1
# of downloads :
53
Origin country :
DE DE
Vendor Threat Intelligence
No detections
Result
Verdict:
Malware
Maliciousness:

Behaviour
Creating a file
DNS request
Changes access rights for a written file
Creating a file in the %temp% directory
Receives data from a server
Sets a written file as executable
Opens a port
Connection attempt
Runs as daemon
Launching a process
Manages services
Substitutes an application name
Verdict:
Unknown
Threat level:
  0/10
Confidence:
100%
Tags:
base64 gcc rust
Link:
https://www.filescan.io/uploads/6a3d6f52ebb79d103e6d9eff/reports/2224d47f-cd8d-4c68-a99e-8168fc9e9ef6/overview
Status:
terminated
Link:
https://sandbox.kunai.rocks/analysis/5494ab79-80c2-49df-a3a7-95d545abe908
Behavior Graph:
Download SVG
%3 guuid=3b66a4f4-1e00-0000-ae08-d24b3d140000 pid=5181 /usr/bin/sudo guuid=c02716f7-1e00-0000-ae08-d24b3e140000 pid=5182 /tmp/sample.bin guuid=3b66a4f4-1e00-0000-ae08-d24b3d140000 pid=5181->guuid=c02716f7-1e00-0000-ae08-d24b3e140000 pid=5182 execve guuid=580698f8-1e00-0000-ae08-d24b3f140000 pid=5183 /tmp/sample.bin guuid=c02716f7-1e00-0000-ae08-d24b3e140000 pid=5182->guuid=580698f8-1e00-0000-ae08-d24b3f140000 pid=5183 clone guuid=b54ec6f8-1e00-0000-ae08-d24b40140000 pid=5184 /tmp/sample.bin net send-data write-config write-file zombie guuid=580698f8-1e00-0000-ae08-d24b3f140000 pid=5183->guuid=b54ec6f8-1e00-0000-ae08-d24b40140000 pid=5184 clone ffee5cfb-bb94-52c2-8935-ae3a87e774db 127.0.0.1:42780 guuid=b54ec6f8-1e00-0000-ae08-d24b40140000 pid=5184->ffee5cfb-bb94-52c2-8935-ae3a87e774db con 54d92a3b-1447-55af-b534-047898c60c8d 1.1.1.1:53 guuid=b54ec6f8-1e00-0000-ae08-d24b40140000 pid=5184->54d92a3b-1447-55af-b534-047898c60c8d send: 40B guuid=b54ec6f8-1e00-0000-ae08-d24b40140000 pid=5185 /tmp/sample.bin guuid=b54ec6f8-1e00-0000-ae08-d24b40140000 pid=5184->guuid=b54ec6f8-1e00-0000-ae08-d24b40140000 pid=5185 clone guuid=07a7e3fa-1e00-0000-ae08-d24b42140000 pid=5186 /usr/bin/dash guuid=b54ec6f8-1e00-0000-ae08-d24b40140000 pid=5184->guuid=07a7e3fa-1e00-0000-ae08-d24b42140000 pid=5186 execve guuid=ec907843-1f00-0000-ae08-d24b58140000 pid=5208 /usr/bin/dash zombie guuid=b54ec6f8-1e00-0000-ae08-d24b40140000 pid=5184->guuid=ec907843-1f00-0000-ae08-d24b58140000 pid=5208 execve guuid=316f1efb-1e00-0000-ae08-d24b43140000 pid=5187 /usr/bin/systemctl guuid=07a7e3fa-1e00-0000-ae08-d24b42140000 pid=5186->guuid=316f1efb-1e00-0000-ae08-d24b43140000 pid=5187 execve guuid=8d5a1844-1f00-0000-ae08-d24b59140000 pid=5209 /usr/bin/systemctl guuid=ec907843-1f00-0000-ae08-d24b58140000 pid=5208->guuid=8d5a1844-1f00-0000-ae08-d24b59140000 pid=5209 execve
Verdict:
Suspicious
Link:
https://analyze.intezer.com/analyses/3f40d266-c777-4dcf-829b-2606b5efd836
Result
Threat name:
Xmrig
Create hunting rule
Detection:
malicious
Classification:
troj.spyw.evad.mine
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/1933885
Signature
Antivirus / Scanner detection for submitted sample
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
Executes the "nc" (netcat) command used to establish arbitrary TCP or UDP connections and listens
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
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: 1933885 Sample: kworkerd-cgroup.elf Startdate: 25/06/2026 Architecture: LINUX Score: 100 84 api.robotmarkethub.com 2->84 86 91.239.211.89, 37746, 39228, 39230 HOSTKEY-ASNL Germany 2->86 88 99 other IPs or domains 2->88 98 Antivirus detection for dropped file 2->98 100 Antivirus / Scanner detection for submitted sample 2->100 102 Yara detected Xmrig cryptocurrency miner 2->102 12 systemd sh 2->12         started        14 kworkerd-cgroup.elf 2->14         started        17 systemd snapd-env-generator 2->17         started        19 systemd snapd-env-generator 2->19         started        signatures3 104 Performs DNS TXT record lookups 84->104 process4 signatures5 21 sh sh 12->21         started        24 sh wget 12->24         started        26 sh rm 12->26         started        120 Found strings related to Crypto-Mining 14->120 28 kworkerd-cgroup.elf 14->28         started        process6 file7 80 /dev/shm/.exectest.5540, POSIX 21->80 dropped 30 sh .d 21->30         started        32 sh wget 21->32         started        36 sh 21->36         started        40 28 other processes 21->40 82 /tmp/..redis-sentinel, POSIX 24->82 dropped 38 kworkerd-cgroup.elf 28->38         started        process8 file9 42 .d 30->42         started        74 /dev/shm/.d, ELF 32->74 dropped 90 Drops invisible ELF files 32->90 44 sh grep 36->44         started        47 kworkerd-cgroup.elf sh 38->47         started        49 kworkerd-cgroup.elf sh 38->49         started        92 Searches for CPU information (likely indicative of DDoS capability) 40->92 94 Sample deletes itself 40->94 96 Executes the "nc" (netcat) command used to establish arbitrary TCP or UDP connections and listens 40->96 signatures10 process11 signatures12 51 .d 42->51         started        118 Searches for CPU information (likely indicative of DDoS capability) 44->118 55 sh systemctl 47->55         started        57 sh systemctl 49->57         started        process13 file14 76 /var/spool/cron/crontabs/root, ASCII 51->76 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        64 .d 51->64         started        66 199 other processes 51->66 signatures15 process16 signatures17 116 Executes itself again with its parent PID as an argument (indicative of hampering debugging) 59->116 68 sh crontab 59->68         started        72 sh crontab 62->72         started        process18 file19 78 /var/spool/cron/crontabs/tmp.Lc4qtA, ASCII 68->78 dropped 112 Sample tries to persist itself using cron 68->112 114 Executes the "crontab" command typically for achieving persistence 68->114 signatures20
Score:
100%
Verdict:
Malware
File Type:
ELF
Link:
https://malprob.io/report/ef801a4aaaadbcedd44a8d3568467769854752886ff63db6c4490618d2e76335
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/ef801a4aaaadbcedd44a8d3568467769854752886ff63db6c4490618d2e76335/
Threat name:
Linux.Trojan.Generic
Create hunting rule
Status:
Suspicious
First seen:
2026-06-25 18:12:37 UTC
File Type:
ELF32 Little (SO)
AV detection:
4 of 36 (11.11%)
Threat level:
  5/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=56abusvkvw6o3vckru2wqrtxngcuouuin73d3nwejedbruxhmm2q._file
Please note that we are no longer able to provide a coverage score for Virus Total.

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: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: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 ef801a4aaaadbcedd44a8d3568467769854752886ff63db6c4490618d2e76335

(this sample)

  
URLhaus
https://urlhaus.abuse.ch/url/3868023/
  
Delivery method
Distributed via web download
  
URLhaus
https://urlhaus.abuse.ch/url/3868017/

Comments