MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 74f5df72efa6a4e3e19363f5aa04a2ffb37d86499df7055d1414953ea684f618. 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 2 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: 74f5df72efa6a4e3e19363f5aa04a2ffb37d86499df7055d1414953ea684f618
SHA3-384 hash: 242fc7a70a17ea02f3b7fe23d0288dd9f3b006bd602cebaf7a7ad85b973d4b78c19cd9e53f4658cf1915312bb272f3c8
SHA1 hash: 73af120035b14b35ac432d56199b2ea4a71db88b
MD5 hash: a3c4bfe9e60d96744898f7216ac961e2
humanhash: carpet-blossom-diet-island
File name:kworkerd-writeback
Download: download sample
Signature CoinMiner
Create hunting rule
File size:329'176 bytes
First seen:2026-06-21 15:20:51 UTC
Last seen:Never
File type: elf
MIME type:application/x-sharedlib
ssdeep 6144:SSAkbkVI06XG3d7NrJrV2GaCeh13f6JJN2sukGO4YbCFiGJOlcBX:Q1aCKGf0FlAlc5
TLSH T1D4645B02FF441E13C5411FB05D7B07B6E3AD48926CA9E13D9E0A7F2506B28B9A5CF789
Magika elf
Reporter abuse_ch
Tags:CoinMiner elf upx-dec


Avatar
abuse_ch
UPX decompressed file, sourced from SHA256 b98d8b8f4e73e553bd42bd8afd12d6afc1e5ff38a651f1e6fc3d1186d142a8ef
File size (compressed) :116'084 bytes
File size (de-compressed) :329'176 bytes
Format:linux/ppc32
Packed file: b98d8b8f4e73e553bd42bd8afd12d6afc1e5ff38a651f1e6fc3d1186d142a8ef

Intelligence

File Origin
# of uploads :
1
# of downloads :
66
Origin country :
NL NL
Vendor Threat Intelligence
No detections
Detection(s):
SecuriteInfo.com.Linux.BackDoor.Armada.1.11625.22787.UNOFFICIAL
Create hunting rule

Result
Verdict:
Malware
Maliciousness:

Behaviour
Manages services
Deleting a recently created file
Collects information on the CPU
Sets a written file as executable
Receives data from a server
Connection attempt
DNS request
Runs as daemon
Creating a file in the %temp% directory
Launching a process
Opens a port
Sends data to a server
Creating a file
Changes the time when the file was created, accessed, or modified
Changes access rights for a written file
Kills critical processes
Substitutes an application name
Creates or modifies files in /cron to set up autorun
Deleting of the original file
Creates or modifies files in /init.d to set up autorun
Verdict:
Unknown
Threat level:
  0/10
Confidence:
100%
Tags:
base64 gcc
Link:
https://www.filescan.io/uploads/6a38017931dc626703eb8205/reports/0dce4981-d44a-41ae-917b-c48ac910c7c4/overview
Verdict:
Malicious
File Type:
elf.32.be
First seen:
2026-06-21T14:32:00Z UTC
Last seen:
2026-06-22T23:48:00Z UTC
Hits:
~10
Link:
https://opentip.kaspersky.com/74f5df72efa6a4e3e19363f5aa04a2ffb37d86499df7055d1414953ea684f618/results?tab=lookup
Status:
terminated
Link:
https://sandbox.kunai.rocks/analysis/af6bcbc2-2b9d-4570-bc04-1f4c4cfe00e4
Behavior Graph:
Download SVG
%3 guuid=d8899a43-1a00-0000-a859-b80e6e0d0000 pid=3438 /usr/bin/sudo guuid=beee2146-1a00-0000-a859-b80e6f0d0000 pid=3439 /tmp/sample.bin guuid=d8899a43-1a00-0000-a859-b80e6e0d0000 pid=3438->guuid=beee2146-1a00-0000-a859-b80e6f0d0000 pid=3439 execve
Verdict:
Unknown
Link:
https://analyze.intezer.com/analyses/25e9cad2-4161-4989-8268-fbdcd7283c15
Result
Threat name:
Xmrig
Create hunting rule
Detection:
malicious
Classification:
troj.spyw.evad.mine
Score:
84 / 100
Link:
https://www.joesandbox.com/analysis/1931499
Signature
Antivirus / Scanner detection for submitted sample
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 Xmrig cryptocurrency miner
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 dnsIp2 2 Behavior Graph ID: 1931499 Sample: kworkerd-writeback.elf Startdate: 21/06/2026 Architecture: LINUX Score: 84 57 api.robotmarkethub.com 2->57 59 91.239.211.89, 47268, 47270, 47272 HOSTKEY-ASNL Germany 2->59 63 Antivirus / Scanner detection for submitted sample 2->63 65 Yara detected Xmrig cryptocurrency miner 2->65 10 kworkerd-writeback.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 67 Performs DNS TXT record lookups 57->67 process4 signatures5 69 Found strings related to Crypto-Mining 10->69 19 kworkerd-writeback.elf 10->19         started        21 sh wget 13->21         started        24 sh sh 13->24         started        26 sh rm 13->26         started        process6 file7 28 kworkerd-writeback.elf 19->28         started        51 /tmp/..redis-sentinel, Bourne-Again 21->51 dropped process8 file9 55 /var/spool/cron/crontabs/root, ASCII 28->55 dropped 75 Opens /sys/class/net/* files useful for querying network interface information 28->75 77 Sample deletes itself 28->77 79 Sample tries to persist itself using cron 28->79 32 kworkerd-writeback.elf sh 28->32         started        35 kworkerd-writeback.elf sh 28->35         started        37 kworkerd-writeback.elf sh 28->37         started        39 kworkerd-writeback.elf sh 28->39         started        signatures10 process11 signatures12 61 Executes itself again with its parent PID as an argument (indicative of hampering debugging) 32->61 41 sh crontab 32->41         started        45 sh crontab 35->45         started        47 sh systemctl 37->47         started        49 sh systemctl 39->49         started        process13 file14 53 /var/spool/cron/crontabs/tmp.sQLFrE, ASCII 41->53 dropped 71 Sample tries to persist itself using cron 41->71 73 Executes the "crontab" command typically for achieving persistence 41->73 signatures15
Score:
99%
Verdict:
Malware
File Type:
ELF
Link:
https://malprob.io/report/74f5df72efa6a4e3e19363f5aa04a2ffb37d86499df7055d1414953ea684f618
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/74f5df72efa6a4e3e19363f5aa04a2ffb37d86499df7055d1414953ea684f618/
Threat name:
Linux.Trojan.Multiverze
Create hunting rule
Status:
Malicious
First seen:
2026-06-21 15:21:37 UTC
File Type:
ELF32 Big (SO)
AV detection:
12 of 23 (52.17%)
Threat level:
  5/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=ot2564xpu2sohymtmp22ubfc76zx3bsjtx3qkxiucskt5jue6yma._file
Result
Malware family:
n/a
Score:
  1/10
Tags:
linux
Link:
https://tria.ge/reports/260621-srkfpaex5y/
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/74f5df72efa6a4e3e19363f5aa04a2ffb37d86499df7055d1414953ea684f618

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: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 b98d8b8f4e73e553bd42bd8afd12d6afc1e5ff38a651f1e6fc3d1186d142a8ef

CoinMiner

elf 74f5df72efa6a4e3e19363f5aa04a2ffb37d86499df7055d1414953ea684f618

(this sample)

  
Dropped by
SHA256 b98d8b8f4e73e553bd42bd8afd12d6afc1e5ff38a651f1e6fc3d1186d142a8ef
  
Dropped by
MD5 5602173a4b3571d1723a2fb3e066c1dd
  
URLhaus
https://urlhaus.abuse.ch/url/3868024/
  
Delivery method
Distributed via web download

Comments