Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 7c3953eaf62294ea…

MALICIOUS

Office (OOXML)

89.3 KB Created: 2001-12-21 16:06:12 UTC Authoring application: Microsoft Excel 12.0000
MD5: 539a83f0656339aa4c43cf01cd3171c8 SHA-1: 6ba56890ce6a7e230b248c268127c1ef6fa6cc45 SHA-256: 7c3953eaf62294eac5e9c22b3b9e9867f6de5b9d310285bf0c5d8b20464f959c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment T1204.002 Malicious File

The sample is an Excel document containing a Workbook_Open macro that uses the Shell() function to execute a command. The macro constructs a command by concatenating environment variables and other strings, likely to download and execute a second-stage payload. The presence of a fake invoice lure further supports the malicious intent.

Heuristics 7

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_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.
  • VBA project inside OOXML medium OOXML_VBA
    Document contains a VBA project — VBA macros present
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • Environ() call (env variable access) low OLE_VBA_ENVIRON
    Environ() call (env variable access)
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
20569909cbd7b6cbac14c8e402ac255c543e824fccf6ed3f7696435b6755c9e8		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 1921 bytes
vbaProject_00.bin
84aa963f1d1a2ebb5dd9f117fc6f9f1c5e1a98fc353417ec666ff4ed4cc704a7		 vba-project OOXML VBA project: xl/vbaProject.bin 13824 bytes

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