MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 c91183175ce77360006f964841eb4048cf37cb82103f2573e262927be4c7607f. 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: 12


Intelligence 12 IOCs YARA 1 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: c91183175ce77360006f964841eb4048cf37cb82103f2573e262927be4c7607f
SHA3-384 hash: 1b37bef65ddecf981fc475772e5aa07b2d6b08141e53e6ee7b142297f0f9a54e77dcba11fef222449497724df7d2af61
SHA1 hash: d577c4a264fee27084ddf717441eb89f714972a5
MD5 hash: 7c396677848776f9824ebe408bbba943
humanhash: two-beer-six-golf
File name:BULLETEN_H.doc
Download: download sample
File size:2'683'823 bytes
First seen:2026-02-02 11:29:46 UTC
Last seen:Never
File type:Word file doc
MIME type:text/rtf
ssdeep 6144:7UugegRKmQKfSFYysPHwyciGYdRa5GUoEF2NbtqST7I:I/RzwF+PZdRa5QEKN7I
TLSH T1B5C552B898224959D615695F0387BD1820AAFC432AF314E28F7EEE795ED9DFEDC07004
TrID 83.3% (.RTF) Rich Text Format (5000/1)
16.6% (.JSON) JSON object (generic) (1000/1)
Magika rtf
Reporter smica83
Tags:APT28 CVE-2026-21509 doc

Intelligence

File Origin
# of uploads :
1
# of downloads :
156
Origin country :
HU HU
Vendor Threat Intelligence
Gathering data
Malware family:
n/a
ID:
1
File name:
BULLETEN_H.doc
Verdict:
Suspicious activity
Analysis date:
2026-01-30 08:21:37 UTC
Tags:
generated-doc ole-embedded webdav
Link:
https://app.any.run/tasks/8686e1b9-dd91-4ecc-88cd-32b4628aad28

Note:
ANY.RUN is an interactive sandbox that analyzes all user actions rather than an uploaded sample
Verdict:
Malicious
Score:
91.7%
Link:
https://cyber-fortress.com/docs/result/index.php?id=69808af4a9ffec4a96094776
Tags:
vmdetect office remo hype
Result
Verdict:
Malicious
File Type:
Fake RTF File
Link:
https://app.docguard.net/c91183175ce77360006f964841eb4048cf37cb82103f2573e262927be4c7607f/results/dashboard
Behaviour
BlacklistAPI detected
Verdict:
Suspicious
Threat level:
  5/10
Confidence:
100%
Tags:
anti-vm exploit smb
Link:
https://www.filescan.io/uploads/69808ae7c9bfb60ece1a6336/reports/ec83041f-18af-4113-8612-7ed73ab07025/overview
Verdict:
Malicious
Labled as:
CVE-2026-21509
Link:
https://www.hybrid-analysis.com/sample/c91183175ce77360006f964841eb4048cf37cb82103f2573e262927be4c7607f
Label:
Benign
Suspicious Score:
/10
Score Malicious:
%
Score Benign:
1%
Link:
https://www.malware.ai/gui/files/?id=a3f56f21-6b61-4ed4-9477-a9a3b23d27b1
Verdict:
Malicious
File Type:
rtf
First seen:
2026-01-30T10:38:00Z UTC
Last seen:
2026-02-02T09:30:00Z UTC
Hits:
~10
Detections:
PDM:Exploit.Win32.Generic HEUR:Exploit.RTF.CVE-2026-21509.gen
Link:
https://opentip.kaspersky.com/c91183175ce77360006f964841eb4048cf37cb82103f2573e262927be4c7607f/results?tab=lookup
Result
Threat name:
n/a
Detection:
malicious
Classification:
spyw.evad
Score:
56 / 100
Link:
https://www.joesandbox.com/analysis/1861563
Signature
Document Viewer accesses SMB path (likely to steal NTLM hashes or to download payload)
Malicious sample detected (through community Yara rule)
Opens network shares
Behaviour
Behavior Graph:
Download SVG
Score:
2%
Verdict:
Benign
File Type:
SCRIPT
Link:
https://malprob.io/report/c91183175ce77360006f964841eb4048cf37cb82103f2573e262927be4c7607f
Verdict:
inconclusive
YARA:
2 match(es)
Tags:
RTF File
Link:
https://app.malva.re/file/7c396677848776f9824ebe408bbba943
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/c91183175ce77360006f964841eb4048cf37cb82103f2573e262927be4c7607f/
Verdict:
Malicious
Link:
https://tip.neiki.dev/file/c91183175ce77360006f964841eb4048cf37cb82103f2573e262927be4c7607f
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=zeiygf2445zwaadpszeed22ajdhtps4cca7sk47cmkjhxzghmb7q._file
Result
Malware family:
n/a
Score:
  4/10
Tags:
n/a
Link:
https://tria.ge/reports/260202-nmjw5sbz7h/
Behaviour
Checks processor information in registry
Enumerates system info in registry
Suspicious behavior: AddClipboardFormatListener
Suspicious use of SetWindowsHookEx
Drops file in Windows directory
Please note that we are no longer able to provide a coverage score for Virus Total.
Threat name:
Malicious File
Score:
1.00
Link:
https://yomi.yoroi.company/submissions/c91183175ce77360006f964841eb4048cf37cb82103f2573e262927be4c7607f

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: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.

Comments