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

Static analysis result for SHA-256 75df04fe2bbfe95a…

MALICIOUS

Office (OLE) / .DOCX

258.7 KB Created: 2020-10-29 09:30:00 Authoring application: Microsoft Office Word
MD5: ffd66ac67583e382042efef540cfbe8e SHA-1: 7ad64ee5bd6b348d593f82ee01f4a640fdfcbddc SHA-256: 75df04fe2bbfe95af6c2ff3ad6beb372645597b0350f6cc16f995a09e27da829
202 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment T1140 Deobfuscate/Decode Files or Information

The file is a Microsoft Office document containing VBA macros, specifically a Document_Open macro that uses CreateObject. The macros appear to be obfuscated, with the function Fdqq0xw5vbz2kt93 performing string manipulation and potentially downloading further content. The presence of a Document_Open macro and the use of CreateObject are strong indicators of malicious intent, likely to download and execute a secondary payload.

Heuristics 6

  • ClamAV: Doc.Downloader.Generic-9785156-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Generic-9785156-0
  • 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
2c8aded1cc33908777d3554a19067d8f93ed6d8269cc13dcdcff33eca45ebd5f		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 18919 bytes

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