MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 ac613e4db94d72e83ea8d4d285686620a17d1437f771af0a3b8de977686de7b6. 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: 10


Intelligence 10 IOCs YARA 21 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: ac613e4db94d72e83ea8d4d285686620a17d1437f771af0a3b8de977686de7b6
SHA3-384 hash: 289cd62c5343708feb36b3027ee2403a0b81e6a669c178b59bd0fdd67984eead179b867bc1fa921deeb9f287c4a77185
SHA1 hash: 6503264a801c2b2fcbf4ef30fe0329cd327a83e1
MD5 hash: afae557e32b1f977ade8cd099e23ee3d
humanhash: spaghetti-eight-tennis-london
File name:linux_arm6
Download: download sample
Signature Kaiji
Create hunting rule
File size:5'308'416 bytes
First seen:2025-07-11 06:40:19 UTC
Last seen:2025-10-29 15:13:39 UTC
File type: elf
MIME type:application/x-executable
ssdeep 98304:8cSBHdgN2a7JP97kJru8cYWPAXqMu+60:8cS030u+6
TLSH T1B7362A57B8D28A42C0E4367ABCBDC1C432675EB99B9B12675D04FE3D3ABE1990E35304
telfhash t10dc02bc21f0c079cff1be0080801a70927d621310011013d8f52f0831c20cb2334c02a
gimphash d32a616709154d99f5f34672a5e693bcff5dc106b2584b8d6f593ff16d689453
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 kaiji
File size (compressed) :1'484'060 bytes
File size (de-compressed) :5'308'416 bytes
Format:linux/arm
Packed file: 2ef6f80f86749fa39fa726f76ea56512dac72f2e8a707fe51d9a699e5bc2c557

Intelligence

File Origin
# of uploads :
2
# of downloads :
14
Origin country :
DE DE
Vendor Threat Intelligence
Detection(s):
Sanesecurity.Malware.30444.LC.UNOFFICIAL
Create hunting rule

Unix.Trojan.Kaiji-9975495-0
Create hunting rule

Unix.Malware.Kaiji-10002376-0
Create hunting rule

Unix.Malware.Kaiji-10003612-0
Create hunting rule

Unix.Malware.Kaiji-10003670-0
Create hunting rule

Unix.Malware.Kaiji-10025522-0
Create hunting rule

Unix.Malware.Kaiji-10028086-0
Create hunting rule

Unix.Malware.Kaiji-10028719-0
Create hunting rule

Verdict:
Clean
Score:
82.2%
Link:
https://cyber-fortress.com/docs/result/index.php?id=6870b224c9eb9747376845a3linux22vpnfull_triage
Tags:
n/a
Result
Verdict:
Malware
Maliciousness:
Verdict:
Likely Malicious
Threat level:
  7.5/10
Confidence:
100%
Tags:
expand golang lolbin obfuscated
Link:
https://www.filescan.io/uploads/6870b20c80b46be06e9f640d/reports/ae129a81-c28f-4456-9bbe-03ee325ae738/overview
Verdict:
Malicious
Uses P2P?:
false
Uses anti-vm?:
false
Architecture:
arm
Packer:
not packed
Botnet:
unknown
Number of open files:
0
Number of processes launched:
0
Processes remaning?
false
Remote TCP ports scanned:
not identified
Full report:
https://elfdigest.com/brief/ac613e4db94d72e83ea8d4d285686620a17d1437f771af0a3b8de977686de7b6
Behaviour
no suspicious findings
Botnet C2s
TCP botnet C2(s):
not identified
UDP botnet C2(s):
not identified
Status:
terminated
Link:
https://sandbox.kunai.rocks/analysis/c925a09c-f249-43d6-9e54-2fe3009b055f
Behavior Graph:
Download SVG
%3 guuid=7789ca80-1a00-0000-d638-249a400b0000 pid=2880 /usr/bin/sudo guuid=4bbc9483-1a00-0000-d638-249a480b0000 pid=2888 /tmp/sample.bin guuid=7789ca80-1a00-0000-d638-249a400b0000 pid=2880->guuid=4bbc9483-1a00-0000-d638-249a480b0000 pid=2888 execve
Verdict:
Unknown
Link:
https://analyze.intezer.com/analyses/90acbf7c-9145-44c7-a204-376e79030a47
Result
Threat name:
Chaos
Create hunting rule
Detection:
malicious
Classification:
spre.troj.evad
Score:
80 / 100
Link:
https://www.joesandbox.com/analysis/1733424
Signature
Drops files in suspicious directories
Multi AV Scanner detection for submitted file
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
Yara detected Chaos
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 dnsIp2 2 Behavior Graph ID: 1733424 Sample: linux_arm6.elf Startdate: 11/07/2025 Architecture: LINUX Score: 80 118 154.201.82.47, 50318, 50322, 51360 PEGTECHINCUS Seychelles 2->118 120 54.171.230.55, 443, 58864 AMAZON-02US United States 2->120 122 www.google.com 2->122 124 Multi AV Scanner detection for submitted file 2->124 126 Yara detected Chaos 2->126 128 Uses known network protocols on non-standard ports 2->128 12 linux_arm6.elf 2->12         started        16 systemd System.img.config 2->16         started        18 sshd sshd 2->18         started        20 8 other processes 2->20 signatures3 process4 file5 114 /etc/id.services.conf, ELF 12->114 dropped 116 /etc/32678, POSIX 12->116 dropped 140 Sample tries to set files in /etc globally writable 12->140 142 Writes identical ELF files to multiple locations 12->142 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        34 System.img.config pkill 16->34         started        36 System.img.config System.img.config 16->36         started        38 sshd 18->38         started        40 sshd 20->40         started        signatures6 process7 file8 104 /usr/lib/system-monitor, ELF 22->104 dropped 106 /usr/lib/libdlrpcld.so, ELF 22->106 dropped 108 /usr/bin/ss, ELF 22->108 dropped 110 11 other files (10 malicious) 22->110 dropped 130 Sample tries to set files in /etc globally writable 22->130 132 Writes identical ELF files to multiple locations 22->132 134 Sample tries to persist itself using /etc/profile 22->134 136 Drops files in suspicious directories 22->136 42 linux_arm6.elf bash 22->42         started        46 linux_arm6.elf bash 22->46         started        56 2 other processes 22->56 48 service 26->48         started        58 3 other processes 26->58 50 bash 32678 28->50         started        52 sh 32678 30->52         started        54 service 32->54         started        60 3 other processes 32->60 signatures9 process10 file11 112 /etc/crontab, ASCII 42->112 dropped 138 Sample tries to persist itself using cron 42->138 74 4 other processes 46->74 62 service systemctl 48->62         started        64 service sed 48->64         started        66 32678 sleep 50->66         started        68 32678 id.services.conf 52->68         started        70 32678 sleep 52->70         started        76 2 other processes 54->76 72 update-rc.d systemctl 56->72         started        78 3 other processes 56->78 signatures12 process13 process14 80 id.services.conf service systemctl 68->80         started        82 id.services.conf sh 68->82         started        84 id.services.conf pkill 68->84         started        86 id.services.conf id.services.conf 68->86         started        process15 88 service 80->88         started        90 service basename 80->90         started        92 service basename 80->92         started        94 service systemctl 80->94         started        96 sh 32678 82->96         started        process16 98 service systemctl 88->98         started        100 service sed 88->100         started        102 32678 sleep 96->102         started       
Score:
100%
Verdict:
Malware
File Type:
ELF
Link:
https://malprob.io/report/ac613e4db94d72e83ea8d4d285686620a17d1437f771af0a3b8de977686de7b6
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/ac613e4db94d72e83ea8d4d285686620a17d1437f771af0a3b8de977686de7b6/
Threat name:
Linux.Trojan.Multiverze
Create hunting rule
Status:
Malicious
First seen:
2025-07-11 06:41:26 UTC
File Type:
ELF32 Little (Exe)
AV detection:
22 of 38 (57.89%)
Threat level:
  5/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=vrqt4tnzjvzoqpvi2tjik2dgecqx2fbx65y26cr3rxuxo2dn463a._file
Result
Malware family:
kaiji
Create hunting rule
Score:
  10/10
Tags:
family:kaiji defense_evasion discovery execution persistence privilege_escalation ransomware
Link:
https://tria.ge/reports/250711-hfwz8stpv8/
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
Malware Config
C2 Extraction:
154.201.82.47:808
Verdict:
Malicious
Tags:
trojan chaos kaiji Unix.Trojan.Kaiji-9975495-0
YARA:
ELF_Kaiji_Chaos_April_2024
Link:
https://app.threat.zone/submission/9ee12ef2-3d8f-49c7-bbce-393c39d141df
Please note that we are no longer able to provide a coverage score for Virus Total.
Threat name:
Suspicious File
Score:
0.30
Link:
https://yomi.yoroi.company/submissions/ac613e4db94d72e83ea8d4d285686620a17d1437f771af0a3b8de977686de7b6

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:botnet_plaintext_c2
Create hunting rule
Author:cip
Description:Attempts to match at least some of the strings used in some botnet variants which use plaintext communication protocols.
Rule name:DetectEncryptedVariants
Create hunting rule
Author:Zinyth
Description:Detects 'encrypted' in ASCII, Unicode, base64, or hex-encoded
Rule name:DetectGoMethodSignatures
Create hunting rule
Author:Wyatt Tauber
Description:Detects Go method signatures in unpacked Go binaries
Rule name:Detect_Go_GOMAXPROCS
Create hunting rule
Author:Obscurity Labs LLC
Description:Detects Go binaries by the presence of runtime.GOMAXPROCS in the runtime metadata
Rule name:enterpriseapps2
Create hunting rule
Author:Tim Brown @timb_machine
Description:Enterprise apps
Rule name:enterpriseunix2
Create hunting rule
Author:Tim Brown @timb_machine
Description:Enterprise UNIX
Rule name:F01_s1ckrule
Create hunting rule
Author:s1ckb017
Rule name:GoBinTest
Create hunting rule
Rule name:golang
Create hunting rule
Rule name:golang_binary_string
Create hunting rule
Description:Golang strings present
Rule name:identity_golang
Create hunting rule
Author:Eric Yocam
Description:find Golang malware
Rule name:Linux_Generic_Threat_a40aaa96
Create hunting rule
Author:Elastic Security
Rule name:MD5_Constants
Create hunting rule
Author:phoul (@phoul)
Description:Look for MD5 constants
Rule name:NET
Create hunting rule
Author:malware-lu
Rule name:ProgramLanguage_Golang
Create hunting rule
Author:albertzsigovits
Description:Application written in Golang programming language
Rule name:RANSOMWARE
Create hunting rule
Author:ToroGuitar
Rule name:RIPEMD160_Constants
Create hunting rule
Author:phoul (@phoul)
Description:Look for RIPEMD-160 constants
Rule name:setsockopt
Create hunting rule
Author:Tim Brown @timb_machine
Description:Hunts for setsockopt() red flags
Rule name:SHA1_Constants
Create hunting rule
Author:phoul (@phoul)
Description:Look for SHA1 constants
Rule name:SHA512_Constants
Create hunting rule
Author:phoul (@phoul)
Description:Look for SHA384/SHA512 constants
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

Kaiji

elf ac613e4db94d72e83ea8d4d285686620a17d1437f771af0a3b8de977686de7b6

(this sample)

  
URLhaus
https://urlhaus.abuse.ch/url/3581008/
  
Delivery method
Distributed via web download
  
URLhaus
https://urlhaus.abuse.ch/url/3581011/

BLint

The following table provides more information about this file using BLint. BLint is a Binary Linter to check the security properties, and capabilities in executables.

Findings
IDTitleSeverity
CHECK_PIEMissing Position-Independent Executable (PIE) Protectionhigh

Comments