Malicious Office (OLE) / .DOCX — malware analysis report

Static analysis result for SHA-256 17c5c2c8d429dcea…

MALICIOUS

Office (OLE) / .DOCX

576.0 KB Created: 2021-11-03 09:08:00 Authoring application: Microsoft Office Word
MD5: ff1a958a59a14af230ea15e62c472cd9 SHA-1: ffd3513447cd33af6df142bbc249bc2b2be2b38a SHA-256: 17c5c2c8d429dcea665e3d283b874228e01139453709e47e2c283a77fc49d537
244 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The sample contains VBA macros, specifically a Document_Open macro that executes a call to 'bvxfcsd'. This macro also attempts to open a password-protected document named 'zoro.doc' using the password 'doyouknowthatthegodsofdeathonlyeatapples?'. The presence of the 'CreateObject' call and the macro execution strongly suggests a malicious dropper functionality, likely intended to download and execute a second-stage payload. The ClamAV detection 'Doc.Dropper.Valyria-10001413-0' further supports this assessment.

Heuristics 8

  • Office EPRINT stream contains EMF object high CVE related OLE_EPRINT_EMF_OBJECT
    OLE ObjectPool contains an EPRINT stream with EMF data. This is rare in normal documents and is CVE-2007-3893/MS07-046-family evidence when paired with Office exploit payload anomalies, but the malformed EMF record is not proven by this rule alone.
  • ClamAV: Doc.Dropper.Valyria-10001413-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Valyria-10001413-0
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC
    Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
  • VBA macros detected medium OLE_VBA_MACROS
    Document contains VBA macro code
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://schemas.microsoft.com/office/2006/encryption
    • http://schemas.microsoft.com/office/2006/keyEncryptor/password
    • http://schemas.microsoft.com/office/2006/keyEncryptor/certificate
    • http://schemas.openxmlformats.org/drawingml/2006/main

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
0e4a9583f8b4ecec4080dd466152a07f55057af2a0cccdec725579f3d1d20f17		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 2609 bytes
ole10native_00.bin
cb49528acdad2b047cec50a87b2a6ef9b0e349856ba3b1fcc0323db740537bcb		 ole-package OLE Ole10Native stream: ObjectPool/_1697410544/Ole10Native 412451 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact entropy is 7.99, consistent with packed or encrypted content.

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