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

Static analysis result for SHA-256 10dc55d6131467b2…

MALICIOUS

Office (OLE) / .DOCX

168.0 KB Created: 2021-01-22 16:11:00 Authoring application: Microsoft Office Word
MD5: c4fba42b6012ca0b974d7ef7e968a638 SHA-1: b343978428e5233f7cc4f3ec52814988cb6d3639 SHA-256: 10dc55d6131467b2ef53cc13475499dd9f34965a9c847672f707617fc6e2e6cd
202 Risk Score

Malware Insights

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

The sample is a malicious Office document containing VBA macros, specifically a Document_Open macro that executes obfuscated code. This code likely attempts to download and execute a second-stage payload, as indicated by the CreateObject heuristic and the ClamAV detection signature 'Doc.Malware.Emodldr'. The VBA code itself is heavily obfuscated, making it difficult to determine the exact payload or destination URL. The presence of a Document_Open macro and the nature of the detection suggest a spearphishing attachment attack vector.

Heuristics 6

  • ClamAV: Doc.Malware.Emodldr-10033990-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Malware.Emodldr-10033990-0
  • 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
  • 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.openxmlformats.org/drawingml/2006/main

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
5ed4257a756cf59fd0bdd4996a568d11e210a8cb1fd2c78a16a7c0bd2a73f2f9		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 16688 bytes

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