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

Static analysis result for SHA-256 4d710f919e31ec4c…

MALICIOUS

Office (OOXML) / .XLSM

70.9 KB Created: 2020-01-28 19:47:00 UTC Authoring application: Microsoft Excel 16.0300
MD5: cbbba31f78bb45c27c337a6b69ff5bb5 SHA-1: dd320a4747c3b46ffcbe01476045183fc6aebc88 SHA-256: 4d710f919e31ec4c1ba39976907fb7a4e2518e75ef6202e9d0efe9a948ab518c
110 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1059.001 PowerShell T1059.005 Visual Basic T1105 Ingress Tool Transfer

This XLSM file contains VBA macros that, when enabled, execute a PowerShell command. The PowerShell command is constructed from concatenated strings and downloads a file named 'MOKHHT.pif' from 'http://bakoloni.site/tshepo/MOKHHT.pif'. This downloaded file is then executed. The document body itself contains a lure to enable content, claiming it's an older version of Excel and offering a tour, which is a common social engineering tactic. The VBA script also constructs a batch file named 'Uvknnocwvhrmsghrjewmpzz.bat' which is then executed.

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://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
8a719f2307b96fb126a469af0af316bde7995f807b31e9d327467fc074353ab2		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 2657 bytes
vbaProject_00.bin
aad0a395003cb970130fcf0b1e2a43bc5d70a6562e2b038a7de2e16fb50215df		 vba-project OOXML VBA project: xl/vbaProject.bin 20992 bytes

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