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

Static analysis result for SHA-256 47a42e559ec76fbe…

MALICIOUS

Office (OOXML) / .XLSM

392.0 KB Created: 2020-01-28 19:47:00 UTC Authoring application: Microsoft Excel 16.0300
MD5: 358276e5fe3444e7eec6f3c408cf6f21 SHA-1: 53eec2ba0ec8773f2924c4475588104ca1376a11 SHA-256: 47a42e559ec76fbe5b5e64e0d2a547cae397722b0f35890c9b9ed9a9aacc230a
110 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File T1566.001 Spearphishing Attachment T1059.005 Visual Basic

This macro-enabled document contains a VBA script that constructs and executes a PowerShell command. The script reconstructs the command to download a second-stage executable from 'http://cdn.disc-app.com/attachments/8849726203953/8980046280461/exploit.exe' and save it as 'exploit.exe' in the user's profile directory. It then attempts to execute this downloaded file. The presence of a Shell() call and the macro-enable lure strongly indicate a malicious downloader.

Heuristics 5

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • VBA project inside OOXML medium OOXML_VBA
    Document contains vbaProject.bin — 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 (4) low OOXML_EXTERNAL_HYPERLINKS
    Document contains 4 external hyperlinks — clickable URLs are stored as external relationships. First target: https://go.microsoft.com/fwlink/?linkid=844732
  • 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 https://go.microsoft.com/fwlink/?linkid=844732
    • https://go.microsoft.com/fwlink/?linkid=844741
    • https://go.microsoft.com/fwlink/?linkid=844736
    • https://go.microsoft.com/fwlink/?linkid=844747
    • https://go.microsoft.com/fwlink/?linkid=844746
    • https://go.microsoft.com/fwlink/?linkid=844728
    • https://go.microsoft.com/fwlink/?linkid=844735
    • https://go.microsoft.com/fwlink/?linkid=844725
    • https://go.microsoft.com/fwlink/?linkid=844738
    • https://go.microsoft.com/fwlink/?linkid=844749
    • http://go.microsoft.com/fwlink/?LinkId=846285
    • https://go.microsoft.com/fwlink/?linkid=844745
    • https://go.microsoft.com/fwlink/?linkid=844751
    • https://go.microsoft.com/fwlink/?linkid=844743
    • https://go.microsoft.com/fwlink/?linkid=844750
    • https://go.microsoft.com/fwlink/?linkid=844726
    • https://go.microsoft.com/fwlink/?linkid=844742
    • https://go.microsoft.com/fwlink/?linkid=844734
    • http://go.microsoft.com/fwlink/?LinkId=844969

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
a15a21a1e23adc03a8c06c8f98a0fffada0ebe9c6edbddfebed28a5565f29774		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 5872 bytes
vbaProject_00.bin
a46faa1656a3fdbea91cdcfa46a1aa571eff14e6998f064ccd720ece245bead5		 vba-project OOXML VBA project: xl/vbaProject.bin 10752 bytes

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