MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 31d23d8d4b1787ae52677e90704669d990b5c9fce2d4609dbfc7e0fdce68e9b4. 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


Threat unknown


Vendor detections: 8


Intelligence 8 IOCs YARA 22 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: 31d23d8d4b1787ae52677e90704669d990b5c9fce2d4609dbfc7e0fdce68e9b4
SHA3-384 hash: 51f7e07d20178f2272d8fb89c6226a0d458c35330a619e344db1b8597b1227e3be3c90a9ff47840f484365971ca65ec0
SHA1 hash: cef51dbc00853c41c800baddc5bd198d9f0c20f2
MD5 hash: 9c7f869705397d35e27b8042093f056a
humanhash: chicken-high-tennessee-north
File name:kblockd0
Download: download sample
File size:6'160'532 bytes
First seen:2026-07-26 11:00:48 UTC
Last seen:Never
File type: elf
MIME type:application/x-executable
ssdeep 49152:RsznWs09lisLzQy/ZmNAlCUq3bhgXJsnaBnrdWg5Ep:WznU/hCARRnrdLEp
TLSH T173560897B8D24943C4E83677B8BE81C432635EBA9B8652566D04FE3C3EBE5D90E34314
telfhash t16ae0d8b1df1d33cc5be04351878d276ccde839bc1390bb99ce6d265b19634ca7056419
gimphash e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855
Magika elf
Reporter abuse_ch
Tags:elf upx-dec


Avatar
abuse_ch
UPX decompressed file, sourced from SHA256 859cafa7563806f9e84e06bfd2be319a25413f6a05742ff2c49fa4592eb23384
File size (compressed) :1'735'796 bytes
File size (de-compressed) :6'160'532 bytes
Format:linux/arm
Packed file: 859cafa7563806f9e84e06bfd2be319a25413f6a05742ff2c49fa4592eb23384

Intelligence

File Origin
# of uploads :
1
# of downloads :
81
Origin country :
NL NL
Vendor Threat Intelligence
No detections
Detection(s):
SecuriteInfo.com.Linux.BackDoor.Vision.3.10682.19365.UNOFFICIAL
Create hunting rule

Result
Verdict:
Malware
Maliciousness:
Verdict:
Likely Malicious
Threat level:
  7.5/10
Confidence:
100%
Tags:
anti-vm crypto expand golang lolbin reconnaissance
Link:
https://www.filescan.io/uploads/6a65e90745716bf377ecdee8/reports/6820500e-02ab-4bb2-9549-ccd20499bc2c/overview
Verdict:
Malicious
File Type:
elf.32.le
First seen:
2026-07-26T09:21:00Z UTC
Last seen:
2026-07-26T09:39:00Z UTC
Hits:
~10
Link:
https://opentip.kaspersky.com/31d23d8d4b1787ae52677e90704669d990b5c9fce2d4609dbfc7e0fdce68e9b4/results?tab=lookup
Status:
terminated
Link:
https://sandbox.kunai.rocks/analysis/a0cf5223-4e15-47e6-b2db-bdb6af04e08c
Behavior Graph:
Download SVG
%3 guuid=24f184d6-1d00-0000-8eeb-fbf41e0c0000 pid=3102 /usr/bin/sudo guuid=5f8ab7d9-1d00-0000-8eeb-fbf4230c0000 pid=3107 /tmp/sample.bin guuid=24f184d6-1d00-0000-8eeb-fbf41e0c0000 pid=3102->guuid=5f8ab7d9-1d00-0000-8eeb-fbf4230c0000 pid=3107 execve
Verdict:
Unknown
Link:
https://analyze.intezer.com/analyses/db409eea-b4cd-4f2b-a4e6-8ad9928312ce
Result
Threat name:
n/a
Detection:
malicious
Classification:
troj
Score:
56 / 100
Link:
https://www.joesandbox.com/analysis/1948025
Signature
Executes the "crontab" command typically for achieving persistence
Multi AV Scanner detection for submitted file
Sample tries to persist itself using cron
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 dnsIp2 2 Behavior Graph ID: 1948025 Sample: kblockd0.elf Startdate: 26/07/2026 Architecture: LINUX Score: 56 30 147.185.242.125, 41250, 443 CLOUDWEBMANAGE-SC-KamateraIncUS United States 2->30 32 speed.cloudflare.com 162.159.140.220, 59276, 80 CLOUDFLARENET-CloudflareIncUS Canada 2->32 36 Multi AV Scanner detection for submitted file 2->36 10 kblockd0.elf 2->10         started        signatures3 process4 process5 12 kblockd0.elf kblockd0.elf 10->12         started        process6 14 kblockd0.elf bash 12->14         started        16 kblockd0.elf crontab 12->16         started        signatures7 19 bash crontab 14->19         started        23 bash 14->23         started        34 Executes the "crontab" command typically for achieving persistence 16->34 process8 file9 28 /var/spool/cron/crontabs/tmp.aEvhPW, ASCII 19->28 dropped 38 Sample tries to persist itself using cron 19->38 40 Executes the "crontab" command typically for achieving persistence 19->40 25 bash crontab 23->25         started        signatures10 process11 signatures12 42 Executes the "crontab" command typically for achieving persistence 25->42
Score:
100%
Verdict:
Malware
File Type:
ELF
Link:
https://malprob.io/report/31d23d8d4b1787ae52677e90704669d990b5c9fce2d4609dbfc7e0fdce68e9b4
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/31d23d8d4b1787ae52677e90704669d990b5c9fce2d4609dbfc7e0fdce68e9b4/
Threat name:
Linux.Backdoor.DarkDDoSer
Create hunting rule
Status:
Suspicious
First seen:
2026-07-26 11:03:00 UTC
File Type:
ELF32 Little (Exe)
AV detection:
6 of 36 (16.67%)
Threat level:
  5/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=ghjd3dklc6d24uthp2ihartj3gillsp44lkgbhn7y7qp3tti5g2a._file
Result
Malware family:
n/a
Score:
  6/10
Tags:
discovery execution persistence privilege_escalation
Link:
https://tria.ge/reports/260726-m5q8hafk2v/
Behaviour
Enumerates kernel/hardware configuration
Reads runtime system information
Writes file to tmp directory
Creates/modifies Cron job
Enumerates running processes
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/31d23d8d4b1787ae52677e90704669d990b5c9fce2d4609dbfc7e0fdce68e9b4

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:CP_Script_Inject_Detector
Create hunting rule
Author:DiegoAnalytics
Description:Detects attempts to inject code into another process across PE, ELF, Mach-O binaries
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: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:Golang_Find_CSC846
Create hunting rule
Author:Ashar Siddiqui
Description:Find Go Signatuers
Rule name:Golang_Find_CSC846_Simple
Create hunting rule
Author:Ashar Siddiqui
Description:Find Go Signatuers
Rule name:identity_golang
Create hunting rule
Author:Eric Yocam
Description:find Golang malware
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:TH_Generic_MassHunt_Linux_Malware_2026_CYFARE
Create hunting rule
Author:CYFARE
Description:Generic Linux malware mass-hunt rule - 2026
Reference:https://cyfare.net/
Rule name:unixredflags3
Create hunting rule
Author:Tim Brown @timb_machine
Description:Hunts for UNIX red flags
Rule name:vmdetect
Create hunting rule
Author:nex
Description:Possibly employs anti-virtualization techniques

File information

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

elf 859cafa7563806f9e84e06bfd2be319a25413f6a05742ff2c49fa4592eb23384

elf 31d23d8d4b1787ae52677e90704669d990b5c9fce2d4609dbfc7e0fdce68e9b4

(this sample)

  
Dropped by
SHA256 859cafa7563806f9e84e06bfd2be319a25413f6a05742ff2c49fa4592eb23384
  
Dropped by
MD5 c4c0e17a9e72a5b7d876c4e059538148

Comments