Office (OOXML) / .XLSX malware analysis — malicious · e0a68bbd47ca887a

MALICIOUS

Office (OOXML) / .XLSX

96.5 KB Created: 2021-06-03 14:28:29 UTC Authoring application: Microsoft Excel 16.0300

MD5: 8f2034db9225b00de11cf3ded786b8ef SHA-1: a49f48ba59e615856b3094afd7b5470d9968e984 SHA-256: e0a68bbd47ca887a82249978dea1e6328f9ff75d9683dfc5cc2417facb9db7a4

120 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

The file is an Excel spreadsheet containing VBA macros and an Excel 4.0 macro sheet. The critical heuristic firing indicates the presence of Excel 4.0 macros, which are often used for malicious purposes. The VBA code includes a CreateObject call, and the Excel 4.0 macro sheet contains a 'cmd' function call, suggesting it is used to execute system commands. This functionality is likely used to download and execute a second-stage payload.

Heuristics 3

Excel 4.0 macro sheet (1 sheet(s)) critical OOXML_XLM_MACROSHEET

Spreadsheet contains an Excel 4.0 (XLM) macro sheet — XLM was a major Office malware vector during 2020-2022 and evaded many VBA-focused controls before Microsoft tightened XLM defaults. Even legitimate XLM use is rare in modern workbooks. The macro sheet is stored as XLSB/BIFF12 binary content, which many XML-only OOXML scanners miss.
CreateObject call high OLE_VBA_CREATEOBJ

CreateObject call
VBA project inside OOXML medium OOXML_VBA

Document contains vbaProject.bin — VBA macros present

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `a690df2df5df231a2928ff81659a2f3dc917be75f79cc34eb77034ea07af3db8`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	649 bytes
`vbaProject_00.bin` `c11532bb59a5f799088657fbd188ab9e45d22a2fbbc17249c2d5a5821c53676c`	vba-project	OOXML VBA project: xl/vbaProject.bin	12288 bytes
`xlm_sheet_00.bin` `0849be3c78ba6f217fae32693c1b1f66f9cbe78d78e2f4838a3f4736009d97de`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet1.bin	2184 bytes

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