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

Static analysis result for SHA-256 7cff52f8cf954bf7…

MALICIOUS

Office (OLE) / .DOC

34.0 KB Created: 2020-06-19 00:26:00 Authoring application: Microsoft Office Word
MD5: 6b2dca0aa980917d685ebb024048591c SHA-1: af7c42d46d7052bfe15538194e60904635261ea7 SHA-256: 7cff52f8cf954bf75c073166ec394261b26f42828647f4ff930641ffb21151cc
340 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

The sample is a malicious OLE document containing VBA macros. Critical heuristics indicate the use of the Shell() function and auto-execution of macros via AutoOpen, Workbook_Open, or Auto_Open. This suggests the macros are designed to run arbitrary code upon opening the document. The ClamAV detection and static triage further confirm its downloader nature. No specific family could be identified, but the primary IOC is the macro file itself.

Heuristics 9

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • ClamAV: Doc.Downloader.Generic-6698421-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Generic-6698421-0
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • Auto_Open macro high OLE_VBA_AUTO
    Auto_Open macro
  • 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.
  • Suspicious extracted artifact high 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.
  • 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
f1e6d371759331afd01a14ab8b75d06c780f9fcc24532d01ee7de1ab8aabbc06		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 3938 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 203 Chr/ChrW string-construction calls. Carved macro source contains an auto-exec entry point and execution/download terms.

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