Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 1de284247ebb2bb2…

MALICIOUS

Office (OOXML)

67.7 KB Created: 2012-10-19 22:33:57 UTC Authoring application: Microsoft Excel 12.0000
MD5: b6451d62c9c383433ff4796aa6df0e72 SHA-1: 39bd768fd2c9df5f81c28ebfb866ff96e5a97cdb SHA-256: 1de284247ebb2bb28c122a6349b2577ea049dac16585b9cf4eeae0d19a7020a6
208 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1218 System Binary Proxy Execution

The critical heuristic 'OLE_VBA_LOLBIN' and the high-severity 'OLE_VBA_WBOPEN' and 'OLE_VBA_CREATEOBJ' firings indicate that this Excel document contains a Workbook_Open macro designed to execute a legitimate Windows binary (LOLBin) for malicious purposes. The script attempts to create a file named 'qPivotCellPivotField.xsl' in the ALLUSERSPROFILE directory, likely to stage a payload. The use of CreateObject and Environ() suggests dynamic execution and potential payload retrieval.

Heuristics 6

  • LOLBin reference in VBA critical OLE_VBA_LOLBIN
    LOLBin reference in VBA
  • 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
3b9f3afb0618da9d6b156efe39e3205dd56cf2a11f28ea203d220c0f602a4ae3		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 3961 bytes
vbaProject_00.bin
f788b8c3b37f15ea0f95b53839c22426e22eb3176b30b00f7ab99c838f22f42c		 vba-project OOXML VBA project: xl/vbaProject.bin 16896 bytes

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