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

Static analysis result for SHA-256 d480038c9ef06ec8…

MALICIOUS

Office (OOXML) / .XLSM

73.2 KB Created: 2020-01-28 19:47:00 UTC Authoring application: Microsoft Excel 16.0300
MD5: 0a2ddcbe4687cf927ba02d332aa2a6d6 SHA-1: b7fdb409e76495b4bcfb374d68cfcf919fbb4afe SHA-256: d480038c9ef06ec8e9d2ffba282c52e8f52f61e233ebb125ca4d3dcbfed9e161
110 Risk Score

Malware Insights

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

This XLSM file contains VBA macros that instruct the user to enable content, a common lure. The VBA script reconstructs and executes a PowerShell command. This command is heavily encoded but appears to download a file from 'https://marks397.co.za/FRE/MAE K.pif' and save it as '%env:APPDATA%\ProcName'. It then executes this downloaded file. The script also attempts to save itself as 'Uzosupxyvem.bat'.

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 (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.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://www.w3.org/2000/svg
    • http://www.w3.org/1999/xlink
    • 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
621abe4a0f10500ab6edde316735cee0afea52e8067b99aa96d75eead80b012f		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 2774 bytes
vbaProject_00.bin
c96a1efe142bade397134382fd0b1a24316ef06b701b6b386aa323c16528a21d		 vba-project OOXML VBA project: xl/vbaProject.bin 19968 bytes

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