Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 de253df6bf1cba1d…

MALICIOUS

Office (OOXML)

89.8 KB Created: 2001-12-21 16:06:12 UTC Authoring application: Microsoft Excel 12.0000
MD5: 2e0fafa501d2949ce98d8ac3046e74b4 SHA-1: 70c27ec3a777f7c753a39a25a5c1dcc5810b2140 SHA-256: de253df6bf1cba1d21919c3cd5e46f0163673dd0efcb78de4c738294493d17e2
196 Risk Score

Malware Insights

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

The sample is an OOXML file containing a Workbook_Open VBA macro that uses the Shell() function to execute a command. The macro appears to construct a command string by concatenating values from cells and environment variables, likely to download and execute a second-stage payload. The presence of a fake invoice lure in the document body further supports a 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
3fd461684be3438d213013ad1784d1f1e692ca8d585448e486c46140e4ab8c9c		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 1941 bytes
vbaProject_00.bin
be3138edaf108e7905260639fba69363c0640649bcf09b93523020ab3a296445		 vba-project OOXML VBA project: xl/vbaProject.bin 13824 bytes

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