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

Static analysis result for SHA-256 73a8f188ee7255c4…

MALICIOUS

Office (OLE) / .DOC

169.1 KB Created: 2021-01-05 06:14:00 Authoring application: Microsoft Office Word
MD5: d76e079156d845f08fa9b5c993fc04a2 SHA-1: 3f2f5c400d4bb99b4706e1cb5c3aec387223038f SHA-256: 73a8f188ee7255c4416760ad966a98a128f879478e6e0ce2d172e7383efb9b9e
262 Risk Score

Malware Insights

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

The file contains a heavily obfuscated VBA macro that executes upon opening the document. This macro utilizes CreateObject to interact with the file system, attempting to create files with specific names and paths such as 'gMEpHB:\SKWvYCA\YtZqA.fQoAE' and 'ehLoAm:\PAVZiAGU\jVPHv.fAgoFBYmC'. The presence of obfuscated auto-exec loaders and CreateObject calls strongly suggests a downloader or dropper functionality, aiming to stage further malicious activity.

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.Downloader.EmotetRed02224-9938637-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.EmotetRed02224-9938637-0
  • 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
e6cbaf609dbac192156d45839b7ee0912b890e835217bd9fcd38a1509f7c92fb		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 10713 bytes

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