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

Static analysis result for SHA-256 8acb2b5180b8cf98…

MALICIOUS

Office (OOXML) / .XLSM

177.6 KB Created: 2020-01-28 19:47:00 UTC Authoring application: Microsoft Excel 15.0300
MD5: 560618302b4a4115b657453c2f74b335 SHA-1: 9fff390a9281d5380a610cc50a56ff46f3bfce96 SHA-256: 8acb2b5180b8cf98903a60a80221c5f270fc66bd15e2948f8d56d546bdc2a065
110 Risk Score

Malware Insights

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

The VBA macro contains a critical Shell() call that constructs and executes a PowerShell command. This command is designed to download a second-stage payload from 'http://samplighter.com/nwabage.exe' and execute it. The macro also creates a batch file named 'Berkhkwic.bat' to launch the PowerShell command. The presence of a macro-enable lure and the Shell() call 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 (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
d0130cb0d0115a036f1ad90930ad3dc0232cd67c5be81639c4377acce6189045		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 2844 bytes
vbaProject_00.bin
7b4bda9aec76468b9098509e5a100d3c56034cbbe32a01d7310d5a663133f541		 vba-project OOXML VBA project: xl/vbaProject.bin 6144 bytes

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