Malicious Office (OOXML) / .OLE — malware analysis report

Static analysis result for SHA-256 e4f4693788de1ce4…

MALICIOUS

Office (OOXML) / .OLE

31.7 KB Created: 2020-12-15 08:57:34 UTC Authoring application: 16.0300
MD5: 133f3b213e33269d9bf6254fe6bb92cc SHA-1: cf8f7ebf6e865dbc9de5795e3e307fc42bd9e6be SHA-256: e4f4693788de1ce418fa92cd6cf953a4e52828ead8f5a9bf175f9e2785c5e3cc
90 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell

The sample is an Office document containing Excel 4.0 macros, indicated by the 'OOXML_XLM_MACROSHEET' heuristic. The VBA script 'macros.bas' contains obfuscated code that appears to construct and execute commands. Specifically, it reconstructs the string 'Salv_e' and uses it in conjunction with other obfuscated logic to likely download and execute a second-stage payload. The 'xlm_sheet_00.xml' file also indicates the presence of Excel 4.0 macros.

Heuristics 4

  • 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.
  • VBA project inside OOXML medium OOXML_VBA
    Document contains vbaProject.bin — VBA macros present
  • Hidden worksheet (hidden) low OOXML_HIDDEN_SHEET
    Excel workbook contains 1 hidden sheet(s) — hidden sheets are commonly used to conceal macro code, staging data, or intermediate payload construction
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://schemas.openxmlformats.org/spreadsheetml/2006/main
    • http://schemas.microsoft.com/office/excel/2006/main
    • http://schemas.openxmlformats.org/officeDocument/2006/relationships
    • http://schemas.openxmlformats.org/markup-compatibility/2006
    • http://schemas.microsoft.com/office/spreadsheetml/2009/9/ac

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
f80e80d3bd03d17c5ccbae8162a44e5caef477239077df7641232cab578402d7		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 1599 bytes
vbaProject_00.bin
659e9f4e46df1d832948e93d1d3e7ad2ed275339043a44f90c05b588fcd6e55e		 vba-project OOXML VBA project: xl/vbaProject.bin 17408 bytes
emf_00.emf
76f287b1e3251b7e0e5ba27bfb05b35831150cc665de00f9fd2d807e2d2a028d		 ooxml-emf OOXML EMF part: xl/media/image1.emf 1976 bytes
xlm_sheet_00.xml
92a40cd0af46722c3293c4e7a9415f6fdff7bd506ff69d54b970b437a5f06386		 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/sheet1.xml 993 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.