MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 efdc414232bc0a035bb6980c8bd5034096d57e07b1a914845eac55ff6ca44792. 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: 11


Intelligence 11 IOCs YARA 19 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: efdc414232bc0a035bb6980c8bd5034096d57e07b1a914845eac55ff6ca44792
SHA3-384 hash: 4cd965f6b8983315bf8769fc0f23b890d856a88b2992a241313a7608d5671e977dfdf2f185d77f322559226922cc12fe
SHA1 hash: a5d69b6d3b6877d71fbf1fdc652410a5dfa61e27
MD5 hash: cdff4380cd03068d5d82f3b0d1a1261b
humanhash: quiet-indigo-potato-finch
File name:linux_386
Download: download sample
Signature Kaiji
Create hunting rule
File size:5'206'016 bytes
First seen:2025-02-22 19:21:35 UTC
Last seen:2025-02-23 11:36:04 UTC
File type: elf
MIME type:application/x-executable
ssdeep 49152:aIJ8Ou+wh2zUVtN9vEaBPC3uIdlLloDH8QEpuGr6KpZd1I1J:ayxyl/N9vROqcK
TLSH T107364A50FECB40B6E9031E3154ABA27F27315D054B24EB97EA14BF6AF93B6910D3620D
telfhash t1a3c2ac73159ca8ecbbf0840786af7520dfe6e02726d0687169f6b4c1d673c539a36878
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 :
2
# of downloads :
25
Origin country :
US US
Vendor Threat Intelligence
Detection(s):
Unix.Malware.Kaiji-10003730-0
Create hunting rule

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

Unix.Malware.Kaiji-10025520-0
Create hunting rule

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

Verdict:
Malicious
Score:
90.9%
Link:
https://cyber-fortress.com/docs/result/index.php?id=67ba2416a0fd713c335c5ad4linux22vpnfull_triage
Tags:
malware
Result
Verdict:
Malware
Maliciousness:

Behaviour
Deleting a recently created file
Runs as daemon
Sets a written file as executable
Connection attempt
Receives data from a server
Sends data to a server
Creating a process from a recently created file
Manages services
Locks files
Changes the time when the file was created, accessed, or modified
Launching a process
Creates directories in a system directory
Creating a file
Mounts file systems
Writes files to system directory
Creates or modifies files in /cron to set up autorun
Writes files to system subdirectory
Replaces system binary files
Creates or modifies files in /init.d to set up autorun
Creates or modifies files to set up autorun
Verdict:
Suspicious
Threat level:
  5/10
Confidence:
100%
Tags:
crypto golang obfuscated
Link:
https://www.filescan.io/uploads/67ba23f43afc3763bec18a28/reports/4f1f7a82-7392-46f4-98f1-431a9a6046ec/overview
Verdict:
Unknown
Link:
https://analyze.intezer.com/analyses/ca66a6ee-d6b4-4325-b23c-8c1dc1b1d985
Result
Threat name:
Kaiji
Create hunting rule
Detection:
malicious
Classification:
spre.troj.evad
Score:
72 / 100
Link:
https://www.joesandbox.com/analysis/1621912
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
Yara detected Kaiji
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 dnsIp2 2 Behavior Graph ID: 1621912 Sample: linux_386.elf Startdate: 22/02/2025 Architecture: LINUX Score: 72 99 196.251.85.22, 40262, 50000 SONIC-WirelessZA Seychelles 2->99 101 www.google.com 2->101 105 Multi AV Scanner detection for submitted file 2->105 107 Yara detected Kaiji 2->107 11 linux_386.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_386.elf linux_386.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 89 /etc/profile.d/gateway.sh, Bourne-Again 19->89 dropped 91 /etc/profile.d/bash_cfg.sh, Bourne-Again 19->91 dropped 93 /etc/init.d/x11-common, POSIX 19->93 dropped 95 44 other files (43 malicious) 19->95 dropped 109 Sample tries to set files in /etc globally writable 19->109 111 Sample tries to persist itself using /etc/profile 19->111 113 Drops files in suspicious directories 19->113 31 linux_386.elf bash 19->31         started        35 linux_386.elf bash 19->35         started        37 linux_386.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 97 /etc/crontab, ASCII 31->97 dropped 103 Sample tries to persist itself using cron 31->103 45 bash 32675 35->45         started        47 service 37->47         started        49 service basename 37->49         started        51 service basename 37->51         started        53 service systemctl 37->53         started        55 sh .mod 39->55         started        57 sh .mod 41->57         started        59 service 43->59         started        61 10 other processes 43->61 signatures10 process11 process12 63 32675 opt.services.cfg 45->63         started        65 32675 opt.services.cfg 45->65         started        67 32675 sleep 45->67         started        77 2 other processes 45->77 69 service systemctl 47->69         started        71 service sed 47->71         started        73 .mod libgdi.so.0.8.1 55->73         started        75 .mod libgdi.so.0.8.1 57->75         started        79 2 other processes 59->79 process13 81 opt.services.cfg opt.services.cfg 63->81         started        83 opt.services.cfg opt.services.cfg 65->83         started        85 libgdi.so.0.8.1 libgdi.so.0.8.1 73->85         started        87 libgdi.so.0.8.1 libgdi.so.0.8.1 75->87         started       
Score:
100%
Verdict:
Malware
File Type:
ELF
Link:
https://malprob.io/report/efdc414232bc0a035bb6980c8bd5034096d57e07b1a914845eac55ff6ca44792
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/efdc414232bc0a035bb6980c8bd5034096d57e07b1a914845eac55ff6ca44792/
Threat name:
Linux.Trojan.Kaiji
Create hunting rule
Status:
Malicious
First seen:
2025-02-22 19:22:42 UTC
File Type:
ELF32 Little (Exe)
AV detection:
17 of 24 (70.83%)
Threat level:
  5/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=57oecqrsxqfagw5wtagixvidiclnk7qhwgurjbc6vrk763fei6ja._file
Result
Malware family:
kaiji
Create hunting rule
Score:
  10/10
Tags:
family:kaiji defense_evasion discovery execution linux persistence privilege_escalation
Link:
https://tria.ge/reports/250222-x3lv4swkaw/
Behaviour
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
Modifies systemd
Write file to user bin folder
Executes dropped EXE
Modifies Watchdog functionality
Kaiji
Kaiji family
Malware Config
C2 Extraction:
196.251.85.22:50000
Verdict:
Malicious
Tags:
trojan Unix.Malware.Kaiji-10003730-0
YARA:
Linux_Generic_Threat_9cf10f10
Link:
https://app.threat.zone/submission/8bf1557a-2cc1-4fd1-9a62-36dbb0e4fae6
Please note that we are no longer able to provide a coverage score for Virus Total.
Threat name:
Malicious File
Score:
0.94
Link:
https://yomi.yoroi.company/submissions/efdc414232bc0a035bb6980c8bd5034096d57e07b1a914845eac55ff6ca44792

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: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_9cf10f10
Create hunting rule
Author:Elastic Security
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: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: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 efdc414232bc0a035bb6980c8bd5034096d57e07b1a914845eac55ff6ca44792

(this sample)

  
URLhaus
https://urlhaus.abuse.ch/url/3448967/
  
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