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

Static analysis result for SHA-256 046dca5d6e5278c4…

MALICIOUS

Office (OLE) / .DOC

1.01 MB Created: 2020-10-05 15:45:00 Authoring application: Microsoft Office Word
MD5: e2b561c53aeb451f2e07e7d372a64707 SHA-1: cbb8696f5accf1ab344c316712b5909691b01800 SHA-256: 046dca5d6e5278c4abd13871ec836a5e5d0b11dfe24e83630b552be873923ecc
262 Risk Score

Malware Insights

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

The sample is a malicious Office document containing heavily obfuscated VBA macros. The presence of an Auto_Close macro and critical heuristics for obfuscated auto-exec loaders indicate that the macro is designed to execute automatically upon closing the document. The script's intent is to download and execute a second-stage payload, as suggested by the 'auto-exec with execution tokens' heuristic.

Heuristics 7

  • Obfuscated auto-exec VBA loader critical OLE_VBA_OBFUSCATED_AUTOEXEC_LOADER
    Auto-exec VBA reconstructs strings with a heavy custom decoder (numeric char-array, repeated hex-string decode, or junk-token Replace removal) and feeds them to a COM-instantiation or execution sink. This obfuscated-loader shape keeps CreateObject/Shell/URL indicators out of the macro source.
  • ClamAV: Doc.Malware.Generic-9775351-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Malware.Generic-9775351-0
  • Reference to Windows Script Host high SC_STR_WSCRIPT
    Reference to Windows Script Host
  • Auto_Close macro high OLE_VBA_AUTOCLOSE
    Auto_Close 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.
  • 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
31dbf11c68f4630ae88daad88721483cc240c540a489617485e4533eac52fb30		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 78221 bytes

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