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

Static analysis result for SHA-256 cf4e53b7758ebb9a…

MALICIOUS

Office (OOXML) / .XLSM

43.1 KB Created: 2020-01-28 19:47:00 UTC Authoring application: Microsoft Excel 16.0300
MD5: 42f4b675b2f4b588a2af7a6aa9ec6c32 SHA-1: 434eea6e1dcf12fb2a9d553df2af285913865838 SHA-256: cf4e53b7758ebb9a9470cb6fd3a2c69fcd96e045534ab80a44eac752c09e50f0
110 Risk Score

Malware Insights

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

This XLSM file contains VBA macros that employ a content-enable lure, instructing the user to enable macros to view the document's content. Upon enabling, the VBA script constructs and executes a PowerShell command. This command downloads a file from 'https://marks397.co.za/FRE/MAE K.pif' and saves it as '$env:APPDAT A\ProcName', then executes it. The script also attempts to save the VBA project 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=846285
  • 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://go.microsoft.com/fwlink/?LinkId=846285
    • http://go.microsoft.com/fwlink/?LinkId=844969

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
a42bb88e400a872a33a488c220b4e9d44c68be2435ceb370b633bb8683376b1f		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 2726 bytes
vbaProject_00.bin
d8d21ed74dd66839a1135f224d279887430e348f7725228e219ba96b8ec9b3b5		 vba-project OOXML VBA project: xl/vbaProject.bin 6656 bytes

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