Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 b1fb17c0b4ea1bf0…

MALICIOUS

Office (OLE)

174.3 KB Created: 2019-12-12 17:31:00 Authoring application: Microsoft Office Word
MD5: ee5fdf7c55353ae60c003e3f451bcbe8 SHA-1: 1db125ee2d42d1732b094912412ae29198dfd9ad SHA-256: b1fb17c0b4ea1bf0addaae3f0f890dc0a0b35468a627cba9aab5c660f9b1935e
262 Risk Score

Malware Insights

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

The sample contains VBA macros, with a critical heuristic firing for obfuscated API names, specifically 'winmgmts'. The 'Document_open' macro is present and configured to execute upon opening the document. This indicates the macro is designed to run automatically, likely to download and execute a second-stage payload, consistent with a downloader malware.

Heuristics 7

  • Dangerous API name reassembled from split string literals critical OLE_VBA_SPLIT_KEYWORD_OBFUSCATION
    VBA concatenates short string literals that reassemble a dangerous API/ProgID/LOLBin name (e.g. Scripting.FileSystemObject, WScript.Shell, powershell, URLDownloadToFile) which appears in no single literal. Splitting an API name across string concatenation is done only to evade keyword scanning.
  • ClamAV: Doc.Downloader.Generic-7449733-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Generic-7449733-0
  • 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
86cf2cdbc4444da9a610e2fd388814581912dff627abc89422cd2c19c4ece2d9		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 8844 bytes

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