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

Static analysis result for SHA-256 e12128d9edb9798a…

MALICIOUS

Office (OOXML) / .XLSM

65.4 KB Created: 2022-04-04 12:51:49 UTC Authoring application: 16.0300 First seen: 2022-04-05
MD5: a5c68f37b3e5cabf773f896407c9d4c3 SHA-1: e3573096561906ed9253d332e46ba8cd0a79a7fd SHA-256: e12128d9edb9798aaf85e9af94c1b1c54d42ee671b0c204daa1e68ab8a3cf0d6
122 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1071.001 Web Protocols

The sample is an XLSM file containing VBA macros. A critical heuristic firing indicates the use of URLDownloadToFile, which is commonly used by malware to download and execute second-stage payloads. The VBA script also contains API calls related to process creation and manipulation, suggesting it is designed to download and run a malicious executable. No specific family could be identified, but the behavior is consistent with a downloader.

Heuristics 4

  • URLDownloadToFile in VBA critical OLE_VBA_DOWNLOAD
    URLDownloadToFile in VBA
  • 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://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/xap/1.0/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/photoshop/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/sType/ResourceEvent#

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
76b5fb7363b0c8774103bfbe152ecec894e13699ab92f517a686dff9c2e01254		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 10494 bytes
vbaProject_00.bin
72f7180f8291bf6518712b4bea7d37d370fde8b18c72f4b313a8cabe000aa2be		 vba-project OOXML VBA project: xl/vbaProject.bin 37376 bytes

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