MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 b98d8b8f4e73e553bd42bd8afd12d6afc1e5ff38a651f1e6fc3d1186d142a8ef. 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 1 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: b98d8b8f4e73e553bd42bd8afd12d6afc1e5ff38a651f1e6fc3d1186d142a8ef
SHA3-384 hash: c28fbf3900019db1d8fecc82c3a79ec8881f64f4257c1c44399209ce020252900f4ccf97dc25f80b0f9fba164c07d7de
SHA1 hash: 69520de691eb1dff454c8139edb69a87807a612b
MD5 hash: 5602173a4b3571d1723a2fb3e066c1dd
humanhash: robin-hot-alaska-mango
File name:kworkerd-writeback
Download: download sample
Signature CoinMiner
Create hunting rule
File size:116'084 bytes
First seen:2026-06-21 15:19:33 UTC
Last seen:2026-06-22 10:01:39 UTC
File type: elf
MIME type:application/x-sharedlib
ssdeep 3072:nykkdgciUVeeuk6i82/NYVH0TDkd2BtxcKP+O7W4u+qgwV4u:ny/VeeRbFXMdWJ+Oy3
TLSH T1F9B31223C3685651F4D77D72E12D87A116E19A1EB442FDD9E268AE311D2FC81C0B38EC
Magika unknown
Reporter abuse_ch
Tags:CoinMiner elf UPX
File size (compressed) :116'084 bytes
File size (de-compressed) :329'176 bytes
Format:linux/ppc32
Unpacked file: 74f5df72efa6a4e3e19363f5aa04a2ffb37d86499df7055d1414953ea684f618

Intelligence

File Origin
# of uploads :
3
# of downloads :
68
Origin country :
DE DE
Vendor Threat Intelligence
No detections
Result
Verdict:
Malware
Maliciousness:

Behaviour
Creating a file in the %temp% directory
Connection attempt
Opens a port
Changes access rights for a written file
Receives data from a server
Changes the time when the file was created, accessed, or modified
DNS request
Runs as daemon
Sets a written file as executable
Deleting a recently created file
Manages services
Collects information on the CPU
Creating a file
Sends data to a server
Launching a process
Creates or modifies files in /cron to set up autorun
Substitutes an application name
Kills critical processes
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:
packed upx
Link:
https://www.filescan.io/uploads/6a38014d9799578a6c4429f5/reports/90a0d5fd-0146-4cc7-b0fd-611f36640fc3/overview
Verdict:
Malicious
File Type:
elf.32.be
First seen:
2026-06-21T14:50:00Z UTC
Last seen:
2026-06-22T23:48:00Z UTC
Hits:
~10
Link:
https://opentip.kaspersky.com/b98d8b8f4e73e553bd42bd8afd12d6afc1e5ff38a651f1e6fc3d1186d142a8ef/results?tab=lookup
Status:
terminated
Link:
https://sandbox.kunai.rocks/analysis/6539f46a-3b14-48a5-8aad-2e89994877fc
Behavior Graph:
Download SVG
%3 guuid=4d158b54-1900-0000-7e49-bd3f550e0000 pid=3669 /usr/bin/sudo guuid=dfa39356-1900-0000-7e49-bd3f610e0000 pid=3681 /tmp/sample.bin guuid=4d158b54-1900-0000-7e49-bd3f550e0000 pid=3669->guuid=dfa39356-1900-0000-7e49-bd3f610e0000 pid=3681 execve
Verdict:
Unknown
Link:
https://analyze.intezer.com/analyses/41067def-22b3-41c9-924d-52ea7807485d
Result
Threat name:
Xmrig
Create hunting rule
Detection:
malicious
Classification:
troj.spyw.evad.mine
Score:
76 / 100
Link:
https://www.joesandbox.com/analysis/1931500
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 Xmrig cryptocurrency miner
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 dnsIp2 2 Behavior Graph ID: 1931500 Sample: kworkerd-writeback.elf Startdate: 21/06/2026 Architecture: LINUX Score: 76 57 api.robotmarkethub.com 2->57 59 91.239.211.89, 37748, 37750, 37752 HOSTKEY-ASNL Germany 2->59 63 Yara detected Xmrig cryptocurrency miner 2->63 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 65 Performs DNS TXT record lookups 57->65 process4 signatures5 67 Found strings related to Crypto-Mining 10->67 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 73 Opens /sys/class/net/* files useful for querying network interface information 28->73 75 Sample deletes itself 28->75 77 Sample tries to persist itself using cron 28->77 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.Q20f6Y, ASCII 41->53 dropped 69 Sample tries to persist itself using cron 41->69 71 Executes the "crontab" command typically for achieving persistence 41->71 signatures15
Score:
100%
Verdict:
Malware
File Type:
ELF
Link:
https://malprob.io/report/b98d8b8f4e73e553bd42bd8afd12d6afc1e5ff38a651f1e6fc3d1186d142a8ef
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/b98d8b8f4e73e553bd42bd8afd12d6afc1e5ff38a651f1e6fc3d1186d142a8ef/
Threat name:
Linux.Trojan.Multiverze
Create hunting rule
Status:
Malicious
First seen:
2026-06-21 15:20:52 UTC
File Type:
ELF32 Big (SO)
AV detection:
11 of 23 (47.83%)
Threat level:
  5/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=xggyxd2oopsvhpkcxwfp2ewwv7a6l7zyuzi7dzx4huiynukcvdxq._file
Result
Malware family:
n/a
Score:
  5/10
Tags:
linux upx
Link:
https://tria.ge/reports/260621-sq5egady6r/
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/b98d8b8f4e73e553bd42bd8afd12d6afc1e5ff38a651f1e6fc3d1186d142a8ef

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:CP_Script_Inject_Detector
Create hunting rule
Author:DiegoAnalytics
Description:Detects attempts to inject code into another process across PE, ELF, Mach-O binaries

File information

The table below shows additional information about this malware sample such as delivery method and external references.

Web download

CoinMiner

elf b98d8b8f4e73e553bd42bd8afd12d6afc1e5ff38a651f1e6fc3d1186d142a8ef

(this sample)

CoinMiner

elf 74f5df72efa6a4e3e19363f5aa04a2ffb37d86499df7055d1414953ea684f618

  
URLhaus
https://urlhaus.abuse.ch/url/3868024/
  
Delivery method
Distributed via web download
  
Dropping
SHA256 74f5df72efa6a4e3e19363f5aa04a2ffb37d86499df7055d1414953ea684f618
  
Dropping
MD5 a3c4bfe9e60d96744898f7216ac961e2

Comments