MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 2ef6f80f86749fa39fa726f76ea56512dac72f2e8a707fe51d9a699e5bc2c557. 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: 2ef6f80f86749fa39fa726f76ea56512dac72f2e8a707fe51d9a699e5bc2c557
SHA3-384 hash: fda3bdc78a6f2109cc182fd202692794fb3734dc1228f7ef22c165c4a233f3fd2837d10d7cc3750c77c0d3fea5dddc45
SHA1 hash: dc1c42dccd94b47d8a5b07e6bec8318fb5a53bc1
MD5 hash: 035d691388fbfb983e335d89c5126594
humanhash: triple-golf-london-lithium
File name:linux_arm6
Download: download sample
Signature Kaiji
Create hunting rule
File size:1'484'060 bytes
First seen:2025-08-14 21:06:30 UTC
Last seen:2025-08-15 20:00:52 UTC
File type: elf
MIME type:application/x-executable
ssdeep 24576:6dEu2zvLFNmG3KOcksWS1x7bVSTiYiYNUhNz6WQz28x6U7nFCXPMsRLiKLX:8ifnmbkHS1tJSTiSmjzbQi8UUj5tKLX
TLSH T1B7653396852D2444DB9306A979D44DF6C5B38C1CB3FA7CE0BDF2D2D09C403ABBDA8856
telfhash t18a90029331b416d45ce80d03d656ae50181b01890050406ad72c51531c147dd482043a
Magika elf
Reporter abuse_ch
Tags:elf kaiji UPX
File size (compressed) :1'484'060 bytes
File size (de-compressed) :5'308'416 bytes
Format:linux/arm
Unpacked file: ac613e4db94d72e83ea8d4d285686620a17d1437f771af0a3b8de977686de7b6

Intelligence

File Origin
# of uploads :
4
# of downloads :
29
Origin country :
DE DE
Vendor Threat Intelligence
Detection(s):
SecuriteInfo.com.Linux.Kaiji.17.27316.28679.UNOFFICIAL
Create hunting rule

Result
Verdict:
Malware
Maliciousness:
Verdict:
Unknown
Threat level:
  2.5/10
Confidence:
100%
Tags:
crypto packed upx
Link:
https://www.filescan.io/uploads/689e5049397fd3ce6fa9d3b9/reports/5f1b16a7-5585-40ca-b9b0-509f2f26c878/overview
Verdict:
Unknown
Link:
https://analyze.intezer.com/analyses/f5df80aa-ab0b-43cf-a00a-75e071003652
Result
Threat name:
n/a
Detection:
malicious
Classification:
spre.troj.evad
Score:
76 / 100
Link:
https://www.joesandbox.com/analysis/1757462
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: 1757462 Sample: linux_arm6.elf Startdate: 14/08/2025 Architecture: LINUX Score: 76 122 154.201.82.47, 37984, 37988, 60502 PEGTECHINCUS Seychelles 2->122 124 www.google.com 2->124 126 Multi AV Scanner detection for submitted file 2->126 128 Uses known network protocols on non-standard ports 2->128 130 Sample is packed with UPX 2->130 12 linux_arm6.elf 2->12         started        16 systemd System.img.config 2->16         started        18 systemd cron 2->18         started        20 12 other processes 2->20 signatures3 process4 file5 118 /etc/id.services.conf, ELF 12->118 dropped 120 /etc/32678, POSIX 12->120 dropped 142 Sample tries to set files in /etc globally writable 12->142 144 Writes identical ELF files to multiple locations 12->144 22 linux_arm6.elf linux_arm6.elf 12->22         started        26 linux_arm6.elf service systemctl 12->26         started        28 linux_arm6.elf bash 12->28         started        30 System.img.config sh 16->30         started        32 System.img.config service systemctl 16->32         started        38 2 other processes 16->38 34 cron 18->34         started        36 cron 20->36         started        40 4 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 132 Sample tries to set files in /etc globally writable 22->132 134 Writes identical ELF files to multiple locations 22->134 136 Sample tries to persist itself using /etc/profile 22->136 138 Drops files in suspicious directories 22->138 42 linux_arm6.elf bash 22->42         started        46 linux_arm6.elf service systemctl 22->46         started        56 6 other processes 22->56 58 4 other processes 26->58 48 bash 32678 28->48         started        50 sh 32678 30->50         started        60 4 other processes 32->60 52 cron sh 34->52         started        54 cron sh 36->54         started        signatures9 process10 file11 116 /etc/crontab, ASCII 42->116 dropped 140 Sample tries to persist itself using cron 42->140 72 4 other processes 46->72 62 32678 sleep 48->62         started        64 32678 id.services.conf 50->64         started        66 32678 sleep 50->66         started        68 sh 52->68         started        70 sh 54->70         started        74 8 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 72->88         started        90 service sed 72->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/2ef6f80f86749fa39fa726f76ea56512dac72f2e8a707fe51d9a699e5bc2c557
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/2ef6f80f86749fa39fa726f76ea56512dac72f2e8a707fe51d9a699e5bc2c557/
Verdict:
Malicious
Threat:
HEUR:Trojan.Linux.Chaos
Link:
https://tip.neiki.dev/file/2ef6f80f86749fa39fa726f76ea56512dac72f2e8a707fe51d9a699e5bc2c557
Threat name:
Linux.Trojan.Kaiji
Create hunting rule
Status:
Malicious
First seen:
2025-08-14 21:09:35 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=f33pqd4gosp2hh5he33w5jlfclnmolzorjyh7zi5tjuz4w6cyvlq._file
Result
Malware family:
kaiji
Create hunting rule
Score:
  10/10
Tags:
family:kaiji defense_evasion discovery execution persistence privilege_escalation ransomware upx
Link:
https://tria.ge/reports/250814-zy1jta1tbs/
Behaviour
GoLang User-Agent
Enumerates kernel/hardware configuration
Reads runtime system information
Changes its process name
Modifies Bash startup script
Creates/modifies Cron job
Creates/modifies environment variables
Enumerates running processes
Modifies init.d
Modifies systemd
Write file to user bin folder
Executes dropped EXE
Modifies Watchdog functionality
Renames multiple (1004) files with added filename extension
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/f65b1fba-c508-4f14-91be-8e7ac844e18b
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/2ef6f80f86749fa39fa726f76ea56512dac72f2e8a707fe51d9a699e5bc2c557

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 2ef6f80f86749fa39fa726f76ea56512dac72f2e8a707fe51d9a699e5bc2c557

(this sample)

  
URLhaus
https://urlhaus.abuse.ch/url/3603512/
  
Delivery method
Distributed via web download

Comments