MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 f4397ea797284d4d4b3c846efa344a523261ca3476064887bfe53160bf5ad70f. 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


Gafgyt


Vendor detections: 5


Intelligence 5 IOCs YARA 7 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: f4397ea797284d4d4b3c846efa344a523261ca3476064887bfe53160bf5ad70f
SHA3-384 hash: 74f5a64a1c9e7c04f91f06f7deb7c7ef63de0bb036e6d2b9f70817cd1cff80e107843c145413c60d830e8c3597823e77
SHA1 hash: b3322a61421fb04119b4fee61a3ec25c3d68177d
MD5 hash: 123875156216213a6f4b9995151926d8
humanhash: papa-football-batman-early
File name:kworkerd-irq
Download: download sample
Signature Gafgyt
Create hunting rule
File size:291'268 bytes
First seen:2026-06-10 10:07:14 UTC
Last seen:Never
File type: elf
MIME type:application/x-executable
ssdeep 6144:PgK7DB48YxQscf/J2Z0+UrPJ7aqyAKaYN4rpmJpJKCAi9tD1rGl:P/DB48Nswq3UrPcIYN4F8AIRGl
TLSH T1B8540856BE419F17C5D216F7FBAD4288371A7BA8C6EE3113D8146F90379A48F0E3A241
telfhash t1ead012ad089a2ac2f2266494028ee3798898c84bde7b9ed15ce12caf50552e12094a4a
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:elf gafgyt upx-dec


Avatar
abuse_ch
UPX decompressed file, sourced from SHA256 c90197d80fec84e03147a7beb3ec030509127c3f574bccc6f6ba0766ed1b4680
File size (compressed) :109'612 bytes
File size (de-compressed) :291'268 bytes
Format:linux/arm
Packed file: c90197d80fec84e03147a7beb3ec030509127c3f574bccc6f6ba0766ed1b4680

Intelligence

File Origin
# of uploads :
1
# of downloads :
68
Origin country :
NL NL
Vendor Threat Intelligence
No detections
Detection(s):
Unix.Trojan.Mirai-10004218-0
Create hunting rule

Result
Verdict:
Clean
Maliciousness:
Status:
terminated
Link:
https://sandbox.kunai.rocks/analysis/db290e50-b074-4180-b50e-a7c20dfff19a
Behavior Graph:
Download SVG
%3 guuid=905dad32-1d00-0000-4da4-953f67090000 pid=2407 /usr/bin/sudo guuid=fccd1736-1d00-0000-4da4-953f6e090000 pid=2414 /tmp/sample.bin guuid=905dad32-1d00-0000-4da4-953f67090000 pid=2407->guuid=fccd1736-1d00-0000-4da4-953f6e090000 pid=2414 execve
Gathering data
Result
Threat name:
Mirai, Xmrig
Create hunting rule
Detection:
malicious
Classification:
troj.spyw.evad.mine
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/1925758
Signature
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)
Multi AV Scanner detection for submitted file
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: 1925758 Sample: kworkerd-irq.elf Startdate: 10/06/2026 Architecture: LINUX Score: 100 71 149.199.157.96, 2323 XILINX-XilinxIncorporatedUS United States 2->71 73 152.239.112.27, 2323 VtalBR Germany 2->73 75 98 other IPs or domains 2->75 77 Malicious sample detected (through community Yara rule) 2->77 79 Multi AV Scanner detection for submitted file 2->79 81 Yara detected Mirai 2->81 83 Yara detected Xmrig cryptocurrency miner 2->83 10 kworkerd-irq.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 process4 signatures5 91 Found strings related to Crypto-Mining 10->91 19 kworkerd-irq.elf 10->19         started        21 sh sh 13->21         started        23 sh wget 13->23         started        26 sh rm 13->26         started        process6 file7 28 kworkerd-irq.elf 19->28         started        31 sh wget 21->31         started        34 sh rm 21->34         started        36 sh 21->36         started        38 5 other processes 21->38 67 /tmp/..redis-sentinel, POSIX 23->67 dropped process8 file9 93 Opens /sys/class/net/* files useful for querying network interface information 28->93 95 Sample deletes itself 28->95 40 kworkerd-irq.elf sh 28->40         started        43 kworkerd-irq.elf sh 28->43         started        45 kworkerd-irq.elf sh 28->45         started        49 2 other processes 28->49 69 /dev/shm/.kworkerd, ELF 31->69 dropped 97 Drops invisible ELF files 31->97 47 sh 36->47         started        signatures10 process11 signatures12 89 Executes itself again with its parent PID as an argument (indicative of hampering debugging) 40->89 51 sh crontab 40->51         started        55 sh crontab 43->55         started        57 sh systemctl 45->57         started        59 sh uname 47->59         started        61 sh tr 47->61         started        63 sh systemctl 49->63         started        process13 file14 65 /var/spool/cron/crontabs/tmp.kjwZ42, ASCII 51->65 dropped 85 Sample tries to persist itself using cron 51->85 87 Executes the "crontab" command typically for achieving persistence 51->87 signatures15
Score:
100%
Verdict:
Malware
File Type:
ELF
Link:
https://malprob.io/report/f4397ea797284d4d4b3c846efa344a523261ca3476064887bfe53160bf5ad70f
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/f4397ea797284d4d4b3c846efa344a523261ca3476064887bfe53160bf5ad70f/
Threat name:
Linux.Backdoor.Gafgyt
Create hunting rule
Status:
Malicious
First seen:
2026-06-10 10:11:55 UTC
File Type:
ELF32 Little (Exe)
AV detection:
8 of 36 (22.22%)
Threat level:
  5/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=6q4x5j4xfbgu2sz4qrxpunckkizgdsruoyderb574uywbp2224hq._file
Result
Malware family:
n/a
Score:
  1/10
Tags:
n/a
Link:
https://tria.ge/reports/260610-l6rd8aat2p/
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:ELF_Toriilike_persist
Create hunting rule
Author:4r4
Description:Detects Torii IoT Botnet (stealthier Mirai alternative)
Reference:Identified via researched data
Rule name:enterpriseapps2
Create hunting rule
Author:Tim Brown @timb_machine
Description:Enterprise apps
Rule name:Linux_Generic_Threat_d94e1020
Create hunting rule
Author:Elastic Security
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: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

Gafgyt

elf c90197d80fec84e03147a7beb3ec030509127c3f574bccc6f6ba0766ed1b4680

Gafgyt

elf f4397ea797284d4d4b3c846efa344a523261ca3476064887bfe53160bf5ad70f

(this sample)

  
Dropped by
SHA256 c90197d80fec84e03147a7beb3ec030509127c3f574bccc6f6ba0766ed1b4680
  
URLhaus
https://urlhaus.abuse.ch/url/3862329/
  
Delivery method
Distributed via web download
  
Dropped by
MD5 ad37f16afb30841e995a3ccd01d3802a

Comments