MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 b3f7cb72809a18ea6a45ac6658fac539e2c066184485e041845d2e2f9949125f. 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: 12


Intelligence 12 IOCs YARA 22 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: b3f7cb72809a18ea6a45ac6658fac539e2c066184485e041845d2e2f9949125f
SHA3-384 hash: 120d27a1d22f2c812ed3a03b19aaee408410198b84baa73cc2d427c7b125cdef323bf403211c23110f7d13138e4d49a0
SHA1 hash: 2b154bf7d864b50f746348bc93044e8e939dbee1
MD5 hash: c5f2dde5dca123520549bd745325fa64
humanhash: beryllium-robin-eighteen-finch
File name:linux_arm6
Download: download sample
Signature Kaiji
Create hunting rule
File size:5'242'880 bytes
First seen:2024-12-10 17:46:26 UTC
Last seen:Never
File type: elf
MIME type:application/x-executable
ssdeep 24576:44v9ubX4NnJ+VWbqyUcN1Ib4zJqDu3WZZ+5YAKQqN02EXS3vUM6j0AJfuD/s3TW5:+VmmsDjfd5uBbTpHqufwmFp8qOTVI1
TLSH T138363C4BB8924682C4E4367ABC7D81D473B34EB99B9713666D04FE3C3ABE1990E35314
telfhash t164d012926a1d17ce3b92c58c1188ce9614ed34d00450467cdf39a31b2643530765947f
gimphash e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855
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

Intelligence

File Origin
# of uploads :
1
# of downloads :
109
Origin country :
DE DE
Vendor Threat Intelligence
Detection(s):
Unix.Malware.Kaiji-10003730-0
Create hunting rule

Unix.Malware.Kaiji-10003917-0
Create hunting rule

Unix.Malware.Kaiji-10028246-0
Create hunting rule

Verdict:
Malicious
Score:
92.5%
Link:
https://cyber-fortress.com/docs/result/index.php?id=6758803375182a06409f61a6linux22vpnfull_triage
Tags:
malware
Result
Verdict:
Malware
Maliciousness:
Verdict:
Likely Malicious
Threat level:
  7.5/10
Confidence:
100%
Tags:
anti-debug expand golang lolbin
Link:
https://www.filescan.io/uploads/67587ea608cfeeff583166c3/reports/03b70321-124b-4ae2-b90c-ad6de517a5c8/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/b3f7cb72809a18ea6a45ac6658fac539e2c066184485e041845d2e2f9949125f
Behaviour
no suspicious findings
Botnet C2s
TCP botnet C2(s):
not identified
UDP botnet C2(s):
not identified
Verdict:
Unknown
Link:
https://analyze.intezer.com/analyses/da0ece21-c75f-49fe-95fc-52c0ec3af0e2
Result
Threat name:
Kaiji
Create hunting rule
Detection:
malicious
Classification:
spre.troj.evad
Score:
76 / 100
Link:
https://www.joesandbox.com/analysis/1572673
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
Writes identical ELF files to multiple locations
Yara detected Kaiji
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 dnsIp2 2 Behavior Graph ID: 1572673 Sample: linux_arm6.elf Startdate: 10/12/2024 Architecture: LINUX Score: 76 97 cc.ava9527.cc 93.123.85.138, 36016, 60888 NET1-ASBG Bulgaria 2->97 99 www.google.com 2->99 103 Multi AV Scanner detection for submitted file 2->103 105 Yara detected Kaiji 2->105 11 linux_arm6.elf 2->11         started        13 systemd cron 2->13         started        15 systemd cron 2->15         started        17 6 other processes 2->17 signatures3 process4 process5 19 linux_arm6.elf linux_arm6.elf 11->19         started        23 cron 13->23         started        25 cron 15->25         started        27 System.mod System.mod 17->27         started        29 System.mod System.mod 17->29         started        file6 87 /usr/lib/system-mark, ELF 19->87 dropped 89 /usr/lib/libgdi.so.0.8.1, ELF 19->89 dropped 91 /usr/bin/ss, ELF 19->91 dropped 93 63 other files (62 malicious) 19->93 dropped 107 Sample tries to set files in /etc globally writable 19->107 109 Writes identical ELF files to multiple locations 19->109 111 Sample tries to persist itself using /etc/profile 19->111 113 Drops files in suspicious directories 19->113 31 linux_arm6.elf bash 19->31         started        35 linux_arm6.elf service systemctl 19->35         started        37 linux_arm6.elf service systemctl 19->37         started        43 6 other processes 19->43 39 cron sh 23->39         started        41 cron sh 25->41         started        signatures7 process8 file9 95 /etc/crontab, ASCII 31->95 dropped 101 Sample tries to persist itself using cron 31->101 45 service 35->45         started        47 service basename 35->47         started        57 2 other processes 35->57 49 service 37->49         started        59 3 other processes 37->59 51 sh .mod 39->51         started        53 sh .mod 41->53         started        55 bash 32675 43->55         started        61 7 other processes 43->61 signatures10 process11 process12 63 service systemctl 45->63         started        65 service sed 45->65         started        67 service systemctl 49->67         started        69 service sed 49->69         started        71 .mod libgdi.so.0.8.1 51->71         started        73 .mod libgdi.so.0.8.1 53->73         started        75 32675 opt.services.cfg 55->75         started        77 32675 sleep 55->77         started        79 32675 sleep 55->79         started        process13 81 libgdi.so.0.8.1 libgdi.so.0.8.1 71->81         started        83 libgdi.so.0.8.1 libgdi.so.0.8.1 73->83         started        85 opt.services.cfg opt.services.cfg 75->85         started       
Score:
100%
Verdict:
Malware
File Type:
ELF
Link:
https://malprob.io/report/b3f7cb72809a18ea6a45ac6658fac539e2c066184485e041845d2e2f9949125f
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/b3f7cb72809a18ea6a45ac6658fac539e2c066184485e041845d2e2f9949125f/
Threat name:
Linux.Trojan.Kaiji
Create hunting rule
Status:
Malicious
First seen:
2024-11-27 11:21:43 UTC
File Type:
ELF32 Little (Exe)
AV detection:
17 of 37 (45.95%)
Threat level:
  5/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=wp34w4uatimou2sfvrtfr6wfhhrmazqyisc6aqmeluxc7gkjcjpq._file
Result
Malware family:
kaiji
Create hunting rule
Score:
  10/10
Tags:
family:kaiji defense_evasion discovery execution persistence privilege_escalatio privilege_escalation
Link:
https://tria.ge/reports/241210-wcwf7a1ph1/
Behaviour
Command and Scripting Interpreter: Unix Shell
Enumerates kernel/hardware configuration
Reads runtime system information
Modifies Bash startup script
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
Malware Config
C2 Extraction:
cc.ava9527.cc:60888
Verdict:
Malicious
Tags:
Unix.Malware.Kaiji-10003730-0
YARA:
n/a
Link:
https://app.threat.zone/submission/bf847e0c-501f-4381-bbfd-c579f6c4dc74
Please note that we are no longer able to provide a coverage score for Virus Total.
Threat name:
Kaiji
Score:
0.90
Link:
https://yomi.yoroi.company/submissions/b3f7cb72809a18ea6a45ac6658fac539e2c066184485e041845d2e2f9949125f

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:DetectGoMethodSignatures
Create hunting rule
Author:Wyatt Tauber
Description:Detects Go method signatures in unpacked Go binaries
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:Linux_Generic_Threat_cd9ce063
Create hunting rule
Author:Elastic Security
Rule name:MD5_Constants
Create hunting rule
Author:phoul (@phoul)
Description:Look for MD5 constants
Rule name:RansomPyShield_Antiransomware
Create hunting rule
Author:XiAnzheng
Description:Check for Suspicious String and Import combination that Ransomware mostly abuse(can create FP)
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:test_Malaysia
Create hunting rule
Author:rectifyq
Description:Detects file containing malaysia string
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 b3f7cb72809a18ea6a45ac6658fac539e2c066184485e041845d2e2f9949125f

(this sample)

  
URLhaus
https://urlhaus.abuse.ch/url/3333442/
  
Delivery method
Distributed via web download

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