Malicious Office (OOXML) / .XLSM — malware analysis report

Static analysis result for SHA-256 80fa4862d3d5ffe4…

MALICIOUS

Office (OOXML) / .XLSM

440.1 KB Created: 2000-04-13 21:48:14 UTC Authoring application: Microsoft Excel 12.0000
MD5: d7e77f0b7240abdb89310ba128949a97 SHA-1: 94b5b3c20987d4aa51b47099ceaf86264ddea805 SHA-256: 80fa4862d3d5ffe4a9d472f42e03a59874e76257c6e25c74de83b236f8f99777
208 Risk Score

Malware Insights

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

The critical heuristic 'OLE_VBA_OBFUSCATED_AUTOEXEC_LOADER' indicates an obfuscated auto-exec VBA loader. The Workbook_Open macro is present and uses CreateObject to execute a command. This script reconstructs a command to execute 'mshta' with a downloaded SCT file, likely to download and run a second-stage payload.

Heuristics 6

  • 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.
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_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 project inside OOXML medium OOXML_VBA
    Document contains a VBA project — VBA macros present
  • Environ() call (env variable access) low OLE_VBA_ENVIRON
    Environ() call (env variable access)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
9d52b46d2245adde54c58046a24e830c153aead903cf35c0f719f2c644f3df6d		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 1171 bytes
vbaProject_00.bin
a3a990167011b133b911f7722b8b0a5727aa07360631d33fee55c1a32d5cb834		 vba-project OOXML VBA project: xl/vbaProject.bin 9216 bytes

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