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

Static analysis result for SHA-256 5d1073afeac1e10a…

MALICIOUS

Office (OOXML) / .XLSM

66.0 KB Created: 2020-01-28 19:47:00 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2022-04-26
MD5: 5592882876c71c8bd201b89b4ab9f228 SHA-1: f8e8785d69a1738996c184431bcbf53ac7508d57 SHA-256: 5d1073afeac1e10a075aacc04860d0302c3b4aecd75065e4b2eddf3c3f6e93d5
250 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1059.003 Windows Command Shell T1105 Ingress Tool Transfer

The sample is an XLSM file containing a Workbook_Open macro. This macro executes a command to download a file named 'jel2.exe' from 'http://www.sarahburrell.info/ndxzstudio/lang/es-es/jel2.exe' using certutil.exe and then executes it. The document body contains a lure to enable content, which is a common tactic for macro-based malware.

Heuristics 8

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • LOLBin reference in VBA critical OLE_VBA_LOLBIN
    LOLBin reference in VBA
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • cmd.exe reference in VBA high OLE_VBA_CMD
    cmd.exe reference in VBA
  • 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
  • External hyperlinks (3) low OOXML_EXTERNAL_HYPERLINKS
    Document contains 3 external hyperlinks — clickable URLs are stored as external relationships. First target: http://go.microsoft.com/fwlink/?LinkId=846286
  • 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://www.sarahburrell.info/ndxzstudio/lang/es-es/jel2.exe
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/sType/ResourceEvent#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/photoshop/1.0/
    • http://ns.adobe.com/tiff/1.0/
    • http://ns.adobe.com/exif/1.0/
    • http://go.microsoft.com/fwlink/?LinkId=846286
    • http://go.microsoft.com/fwlink/?LinkId=844969

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
5e3a4fa5c988d22c6d90f004daa11d8b1a3bc3fa25c13151fb6675c0fdb658e1		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 1436 bytes
vbaProject_00.bin
3df861b6f58700702619f38f4b712bde64a22b83ad481a2a0d98fe37e098c9fa		 vba-project OOXML VBA project: xl/vbaProject.bin 5632 bytes

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