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

Static analysis result for SHA-256 99a2af2b1d39d3ca…

MALICIOUS

Office (OOXML) / .XLSM

42.1 KB Created: 2020-01-28 19:47:00 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2023-03-09
MD5: edef1e97fcca56228c1956db6b514f55 SHA-1: 00d1bb1cf96aee9a21508b23f6ac113153131b1c SHA-256: 99a2af2b1d39d3ca267095cc733dd5e285b40b9c6b1709d34dbb213387c8df93
430 Risk Score

Malware Insights

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

The Workbook_Open macro uses WScript.Shell to execute a PowerShell command. This command downloads a file from the URL https://mindfree.co.za/1/Recrypted.pif, saves it as an executable in the temporary directory, and then executes it. The document body contains a lure to enable content, which is a common technique for macro-based malware.

Heuristics 11

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
  • PowerShell reference in VBA critical OLE_VBA_PS
    PowerShell reference in VBA
  • ClamAV: Xls.Dropper.EPPlus-9802867-2 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Dropper.EPPlus-9802867-2
  • ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV
    ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • VBA project inside OOXML medium OOXML_VBA
    Document contains a VBA project — 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 https://mindfree.co.za/1/Recrypted.pif
    • 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
4d0fda8ef4d6ae878d011ff8d160cfa6053c0dbdd4aa86c6f0531591bae6c8d0		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 1548 bytes
vbaProject_00.bin
e680b2acf1c51c76864c3a913c0c533593bff78488ec9ab57224ddab74f9e600		 vba-project OOXML VBA project: xl/vbaProject.bin 5632 bytes
Detection
ClamAV: Xls.Dropper.EPPlus-9802867-2
Obfuscation or payload: unlikely

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