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

Static analysis result for SHA-256 43a1d51ea1e4440c…

MALICIOUS

Office (OOXML) / .XLSM

95.0 KB Created: 2015-06-05 18:17:20 UTC Authoring application: Microsoft Excel 16.0300
MD5: 0fbeb5912517b97c4a4831b42f0d30fe SHA-1: c0ac7fbe9f3290298e042359e475e6fdf6734e36 SHA-256: 43a1d51ea1e4440c2134518d275bce598dedd9b7dc1a08095c15ed8437f0ec03
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File

The sample is an XLSM file containing VBA macros, indicated by the OOXML_VBA heuristic. The script within the document body reconstructs and executes a PowerShell command. This command downloads a VBScript from 'http://185.205.209.166/cxwv/kol.vbs' and then executes it. This indicates a downloader or dropper functionality.

Heuristics 3

  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • VBA project inside OOXML medium OOXML_VBA
    Document contains vbaProject.bin — VBA macros present
  • 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.openxmlformats.org/officeDocument/2006/relationships
    • http://schemas.openxmlformats.org/markup-compatibility/2006
    • http://schemas.microsoft.com/office/spreadsheetml/2009/9/ac
    • http://schemas.microsoft.com/office/spreadsheetml/2014/revision
    • http://schemas.microsoft.com/office/spreadsheetml/2015/revision2
    • http://schemas.microsoft.com/office/spreadsheetml/2016/revision3

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
af597efab48b8fb98ee472745e19fde20897405b0438bd5864ab659cedbd5b00		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 2178 bytes
vbaProject_00.bin
e01af4a1e98b06ebbffb4b7b67ec8e93abfab3cba4dd507abae10d3495105f1c		 vba-project OOXML VBA project: xl/vbaProject.bin 38912 bytes

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