MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 75dc3ac515dd1cd087309fa4d6a314fabd38a10b43a1863a86534f74a4dc0bfb. 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


Kaiji


Vendor detections: 8


Intelligence 8 IOCs YARA 3 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: 75dc3ac515dd1cd087309fa4d6a314fabd38a10b43a1863a86534f74a4dc0bfb
SHA3-384 hash: 1b19b8be4b9b2114a8553f96ab69e2d50d68133f9a3aa616e860a9447ec56f50b03533323d8d138ac6b91d5661d3e2f3
SHA1 hash: bec909808b522adf23dbdd1e1d1954a519e073d9
MD5 hash: 2f41a223f984f56b55e17a8dc3a180e7
humanhash: gee-blossom-kilo-iowa
File name:linux_arm5
Download: download sample
Signature Kaiji
Create hunting rule
File size:1'490'384 bytes
First seen:2025-08-14 21:06:49 UTC
Last seen:2025-08-15 00:15:33 UTC
File type: elf
MIME type:application/x-executable
ssdeep 24576:UUyBYTIjrcQhy7ozTCj1pCJemtfROmAcCpHKMCbZDodVOU5m82zYM3fE1dUmQr3U:zEYErC7ozZwmRROmAcBboxm82zPfadUA
TLSH T19D6533E19FC2880428E9177424F8B9F08FEEAC822234356E935DA39DBC653D519DDF12
telfhash t1d99002d23c06225db5d52c351004fc3595770a9e067d15176a64400c85062d44a44121
Magika elf
Reporter abuse_ch
Tags:elf kaiji UPX
File size (compressed) :1'490'384 bytes
File size (de-compressed) :5'308'416 bytes
Format:linux/arm
Unpacked file: 0ca9194de2c6c8f8ceea61961a0be141fe82ba5d43a3cfc253af8e25f912a991

Intelligence

File Origin
# of uploads :
3
# of downloads :
28
Origin country :
DE DE
Vendor Threat Intelligence
Detection(s):
SecuriteInfo.com.Linux.DDoS.2355.13920.19634.UNOFFICIAL
Create hunting rule

Result
Verdict:
Malware
Maliciousness:

Behaviour
Changes the time when the file was created, accessed, or modified
Sets a file as executable
Collects information on the RAM
Sends data to a server
Receives data from a server
Connection attempt
DNS request
Creating a file
Sets a written file as executable
Creates directories in a system directory
Launching a process
Locks files
Mounts file systems
Manages services
Creating a process from a recently created file
Substitutes an application name
Replaces system binary files
Writes files to system subdirectory
Writes files to system directory
Creates or modifies files in /cron to set up autorun
Creates or modifies files in /init.d to set up autorun
Creates or modifies files to set up autorun
Performs a bruteforce attack in the network
Verdict:
Unknown
Link:
https://analyze.intezer.com/analyses/472165ce-b6d6-425b-9e03-1da322d4741f
Result
Threat name:
n/a
Detection:
malicious
Classification:
spre.troj.evad
Score:
76 / 100
Link:
https://www.joesandbox.com/analysis/1757450
Signature
Drops files in suspicious directories
Multi AV Scanner detection for submitted file
Sample is packed with UPX
Sample tries to persist itself using /etc/profile
Sample tries to persist itself using cron
Sample tries to set files in /etc globally writable
Uses known network protocols on non-standard ports
Writes identical ELF files to multiple locations
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 dnsIp2 2 Behavior Graph ID: 1757450 Sample: linux_arm5.elf Startdate: 14/08/2025 Architecture: LINUX Score: 76 122 154.201.82.47, 44832, 44838, 50940 PEGTECHINCUS Seychelles 2->122 124 109.202.202.202, 80 INIT7CH Switzerland 2->124 126 4 other IPs or domains 2->126 128 Multi AV Scanner detection for submitted file 2->128 130 Uses known network protocols on non-standard ports 2->130 132 Sample is packed with UPX 2->132 12 linux_arm5.elf 2->12         started        16 systemd System.img.config 2->16         started        18 systemd cron 2->18         started        20 10 other processes 2->20 signatures3 process4 file5 118 /etc/id.services.conf, ELF 12->118 dropped 120 /etc/32678, POSIX 12->120 dropped 144 Sample tries to set files in /etc globally writable 12->144 146 Writes identical ELF files to multiple locations 12->146 22 linux_arm5.elf linux_arm5.elf 12->22         started        26 linux_arm5.elf service systemctl 12->26         started        28 linux_arm5.elf bash 12->28         started        30 System.img.config sh 16->30         started        32 System.img.config service systemctl 16->32         started        34 System.img.config pkill 16->34         started        36 System.img.config System.img.config 16->36         started        38 cron 18->38         started        40 2 other processes 20->40 signatures6 process7 file8 108 /usr/lib/system-monitor, ELF 22->108 dropped 110 /usr/lib/libdlrpcld.so, ELF 22->110 dropped 112 /usr/bin/ss, ELF 22->112 dropped 114 12 other files (11 malicious) 22->114 dropped 134 Sample tries to set files in /etc globally writable 22->134 136 Writes identical ELF files to multiple locations 22->136 138 Sample tries to persist itself using /etc/profile 22->138 140 Drops files in suspicious directories 22->140 42 linux_arm5.elf bash 22->42         started        46 linux_arm5.elf service systemctl 22->46         started        48 linux_arm5.elf bash 22->48         started        56 5 other processes 22->56 58 4 other processes 26->58 50 bash 32678 28->50         started        52 sh 32678 30->52         started        60 4 other processes 32->60 54 cron sh 38->54         started        signatures9 process10 file11 116 /etc/crontab, ASCII 42->116 dropped 142 Sample tries to persist itself using cron 42->142 70 4 other processes 46->70 72 4 other processes 48->72 62 32678 sleep 50->62         started        64 32678 id.services.conf 52->64         started        66 32678 sleep 52->66         started        68 sh 54->68         started        74 4 other processes 56->74 76 2 other processes 58->76 78 2 other processes 60->78 signatures12 process13 process14 80 id.services.conf service systemctl 64->80         started        82 id.services.conf sh 64->82         started        84 id.services.conf pkill 64->84         started        86 id.services.conf id.services.conf 64->86         started        88 service systemctl 70->88         started        90 service sed 70->90         started        process15 92 service 80->92         started        94 service basename 80->94         started        96 service basename 80->96         started        98 service systemctl 80->98         started        100 sh 32678 82->100         started        process16 102 service systemctl 92->102         started        104 service sed 92->104         started        106 32678 sleep 100->106         started       
Score:
100%
Verdict:
Malware
File Type:
ELF
Link:
https://malprob.io/report/75dc3ac515dd1cd087309fa4d6a314fabd38a10b43a1863a86534f74a4dc0bfb
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/75dc3ac515dd1cd087309fa4d6a314fabd38a10b43a1863a86534f74a4dc0bfb/
Verdict:
Malicious
Threat:
HEUR:Trojan.Linux.Chaos
Link:
https://tip.neiki.dev/file/75dc3ac515dd1cd087309fa4d6a314fabd38a10b43a1863a86534f74a4dc0bfb
Threat name:
Linux.Trojan.Kaiji
Create hunting rule
Status:
Malicious
First seen:
2025-08-14 21:09:44 UTC
File Type:
ELF32 Little (Exe)
AV detection:
14 of 24 (58.33%)
Threat level:
  5/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=oxodvriv3uonbbzqt6snniyu7k6triilioqymougknhxjjg4bp5q._file
Result
Malware family:
kaiji
Create hunting rule
Score:
  10/10
Tags:
family:kaiji defense_evasion discovery execution persistence privilege_escalation upx
Link:
https://tria.ge/reports/250814-z1h3js1tdz/
Behaviour
GoLang User-Agent
Enumerates kernel/hardware configuration
Reads runtime system information
Changes its process name
Reads CPU attributes
Modifies Bash startup script
UPX packed file
Creates/modifies Cron job
Creates/modifies environment variables
Enumerates running processes
Modifies init.d
Write file to user bin folder
Executes dropped EXE
Modifies Watchdog functionality
Kaiji
Kaiji family
kaiji_chaosbot
Malware Config
C2 Extraction:
154.201.82.47:808
Verdict:
Unknown
Tags:
n/a
YARA:
n/a
Link:
https://app.threat.zone/submission/e2f951b0-e65d-4071-a6cd-1a64cb05ba89
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/75dc3ac515dd1cd087309fa4d6a314fabd38a10b43a1863a86534f74a4dc0bfb

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:SUSP_ELF_LNX_UPX_Compressed_File
Create hunting rule
Author:Florian Roth (Nextron Systems)
Description:Detects a suspicious ELF binary with UPX compression
Reference:Internal Research
Rule name:Sus_Obf_Enc_Spoof_Hide_PE
Create hunting rule
Author:XiAnzheng
Description:Check for Overlay, Obfuscating, Encrypting, Spoofing, Hiding, or Entropy Technique(can create FP)
Rule name:upx_packed_elf_v1
Create hunting rule
Author:RandomMalware

File information

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

Web download

Kaiji

elf 75dc3ac515dd1cd087309fa4d6a314fabd38a10b43a1863a86534f74a4dc0bfb

(this sample)

  
URLhaus
https://urlhaus.abuse.ch/url/3603575/
  
Delivery method
Distributed via web download

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