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MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 c3f1cdb2820cea923641e183bdfd78cdee56b6a28ba8ed52b875ecac307c37c9. 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


GuLoader


Vendor detections: 8


Intelligence 8 IOCs YARA 5 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: c3f1cdb2820cea923641e183bdfd78cdee56b6a28ba8ed52b875ecac307c37c9
SHA3-384 hash: 1c181ab564bd5d23993b95f3032006179fb64ba720a87df2a0d2be36fe54261c5a2ab41ed29ad672df3b2434d1f95556
SHA1 hash: 712bac54e8f277eccf8d4906ce47422e4fbbe4ba
MD5 hash: 3c6d703450ad1d7aaf97f5a9a564401b
humanhash: robin-timing-december-enemy
File name:inquiry209X2025.pdf.gz
Download: download sample
Signature GuLoader
Create hunting rule
File size:920'951 bytes
First seen:2026-05-20 17:07:17 UTC
Last seen:2026-05-20 18:12:12 UTC
File type: gz
MIME type:application/x-rar
ssdeep 12288:Q7klH6cPiFNaPL755Vxo3htPv6V/7BWvCu7J6W/w0mUtFQDlCSYvaw6TQXgTSk6J:lH6zaoRtPSdkpXGUgDlCDbZarn2D
TLSH T1BF15330F6A6748D050134312C6C93FBD11768CFAE32E4D11BB36F6B66E2225DED8A785
TrID 61.5% (.RAR) RAR compressed archive (v5.0) (8000/1)
38.4% (.RAR) RAR compressed archive (gen) (5000/1)
Magika rar
Reporter TomU
Tags:GuLoader gz

Intelligence

File Origin
# of uploads :
2
# of downloads :
33
Origin country :
CH CH
File Archive Information

This file archive contains 1 file(s), sorted by their relevance:

File name:inquiry_29202500000000.pdf.exe
File size:957'424 bytes
SHA256 hash: b595b68250afbadddf987693c116beb8a3e832b1980782bc5e28ac4c485fe940
MD5 hash: de45ac1412091d09d46430db133a905f
MIME type:application/x-dosexec
Signature GuLoader
Vendor Threat Intelligence
Details
Link:
https://research.acce.ciphertechsolutions.com/results/4b6e4af2-2422-4f5b-a13e-7058035990a9/
Detection(s):
Legacy.Trojan.Agent-1388784
Create hunting rule

Legacy.Trojan.Agent-1388773
Create hunting rule

Sanesecurity.Foxhole.Rar_fs3285.UNOFFICIAL
Create hunting rule

Sanesecurity.Foxhole.Rar_pdf.UNOFFICIAL
Create hunting rule

Sanesecurity.Malware.28929.RarHeur.UNOFFICIAL
Create hunting rule

Verdict:
Malicious
Score:
92.5%
Link:
https://cyber-fortress.com/docs/result/index.php?id=6a0deb834f2b29ce0401e3df
Tags:
underscore injection obfusc virus
Verdict:
Likely Malicious
Threat level:
  7.5/10
Confidence:
100%
Tags:
adaptive-context anti-debug evasive installer installer installer-heuristic masquerade microsoft_visual_cc nsis reconnaissance signed
Link:
https://www.filescan.io/uploads/6a0dede1875badc3b38eae91/reports/0d822fa8-66da-456d-a8cc-ed724a4145d9/overview
Verdict:
Malicious
Labled as:
Trojan.Generic
Link:
https://www.hybrid-analysis.com/sample/c3f1cdb2820cea923641e183bdfd78cdee56b6a28ba8ed52b875ecac307c37c9
Verdict:
Malicious
File Type:
rar
First seen:
2026-05-20T15:56:00Z UTC
Last seen:
2026-05-20T16:20:00Z UTC
Hits:
~10
Link:
https://opentip.kaspersky.com/c3f1cdb2820cea923641e183bdfd78cdee56b6a28ba8ed52b875ecac307c37c9/results?tab=lookup
Gathering data
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/c3f1cdb2820cea923641e183bdfd78cdee56b6a28ba8ed52b875ecac307c37c9/
Threat name:
Win32.Trojan.Generic
Create hunting rule
Status:
Suspicious
First seen:
2026-05-20 18:24:35 UTC
File Type:
Binary (Archive)
Extracted files:
47
AV detection:
22 of 37 (59.46%)
Threat level:
  5/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=ypy43mucbtvjensb4gb337lyzxxfnnvcrouo2uvyoxwkymd4g7eq._file
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/c3f1cdb2820cea923641e183bdfd78cdee56b6a28ba8ed52b875ecac307c37c9

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:Detect_NSIS_Nullsoft_Installer
Create hunting rule
Author:Obscurity Labs LLC
Description:Detects NSIS installers by .ndata section + NSIS header string
Rule name:PE_Digital_Certificate
Create hunting rule
Author:albertzsigovits
Rule name:SUSP_RAR_with_PDF_Script_Obfuscation
Create hunting rule
Author:Florian Roth (Nextron Systems)
Description:Detects RAR file with suspicious .pdf extension prefix to trick users
Reference:Internal Research
Rule name:SUSP_RAR_with_PDF_Script_Obfuscation_RID34A4
Create hunting rule
Author:Florian Roth
Description:Detects RAR file with suspicious .pdf extension prefix to trick users
Reference:Internal Research
Rule name:VECT_Ransomware
Create hunting rule
Author:Mustafa Bakhit
Description:Detects activity associated with VECT ransomware. This includes registry modifications and deletions, execution of system and defense-evasion commands, suspicious API usage, mutex creation, file and memory manipulation, ransomware note generation, anti-debugging and anti-analysis techniques, and embedded cryptographic constants (SHA256) characteristic of this malware family. Designed for threat intelligence and malware detection environments.

File information

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

Malspam

GuLoader

gz c3f1cdb2820cea923641e183bdfd78cdee56b6a28ba8ed52b875ecac307c37c9

(this sample)

  
Delivery method
Distributed via e-mail attachment

Comments