Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 c29fc9ab288745ed…

MALICIOUS

Office (OOXML)

89.2 KB Created: 2001-12-21 16:06:12 UTC Authoring application: Microsoft Excel 12.0000
MD5: 47a9802b4b4a592cd22bd182563d9d5f SHA-1: 034a63d287d06df0cb9ba4c6e71110195dd253ae SHA-256: c29fc9ab288745ed86849242afd9aa7b7db0a336f6cb59369b9962f2cdf73a99
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is an Excel document containing a Workbook_Open macro that executes a shell command. The macro appears to construct a path using the ALLUSERSPROFILE environment variable and a string literal, and then executes a script file named '//theThousandMillions.sct'. This indicates a macro-based downloader designed to execute a second-stage payload.

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
a8cf647fbff00af757f27a5080de64d7593719543f3b4d8b11ef8639e9e01643		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 1918 bytes
vbaProject_00.bin
a4b71ba1ee80edce58f44125a94bf738e17161fe1e0da8a968ddf1090a26f126		 vba-project OOXML VBA project: xl/vbaProject.bin 13824 bytes

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