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

Static analysis result for SHA-256 ce4298647b014560…

MALICIOUS

Office (OOXML) / .XLSM

42.4 KB Created: 2020-01-28 19:47:00 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2022-10-19
MD5: 4cdbf369aea35107af766f0c4a928dc2 SHA-1: 657b4e5c370ace1326b311d251d77bb3dec8a64b SHA-256: ce4298647b014560cc454b87587301f11ffe7478170e7de2af59705ddf87ecc6
370 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File T1059.003 Windows Command Shell T1059 Command and Scripting Interpreter

The Workbook_Open macro executes a command using cmd.exe and certutil.exe to download and execute a second-stage payload from the URL http://80.76.51.142/nod/Payslips%20-%20Week%20Ending%2019%20October%202022.exe. The document body contains a lure to enable content, which is a common technique for macro-based malware droppers.

Heuristics 10

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • LOLBin reference in VBA critical OLE_VBA_LOLBIN
    LOLBin 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
  • cmd.exe reference in VBA high OLE_VBA_CMD
    cmd.exe reference in VBA
  • 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 http://80.76.51.142/nod/Payslips%20-%20Week%20Ending%2019%20October%202022.exe
    • 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
a010b0a8932f29fc8f85198f4024305cc0a8f7cc5d869c792337340d96f71dfe		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 1443 bytes
vbaProject_00.bin
fbe779c1002a5850d1ccd5dacac0a766e2ed719bd1dd575de10684a05ae3b872		 vba-project OOXML VBA project: xl/vbaProject.bin 6144 bytes
Detection
ClamAV: Xls.Dropper.EPPlus-9802867-2
Obfuscation or payload: unlikely

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