Xls.Dropper.EPPlus-9802867-2 — Office (OOXML) / .XLSM malware analysis

Static analysis result for SHA-256 40c51dc794e51130…

MALICIOUS

Office (OOXML) / .XLSM

144.1 KB Created: 2021-08-19 14:03:52 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2022-11-11
MD5: a23b75e35744686fe2b1c6997719030a SHA-1: d36fee6656363031ba2b8d0f72b0273670bda628 SHA-256: 40c51dc794e511304d2403b89d48286a913915cea98e86c8535bfeda77a27ef7
342 Risk Score

Malware Insights

Xls.Dropper.EPPlus-9802867-2 · confidence 95%

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

The Workbook_Open macro executes a command using cmd.exe to download a file from the URL http://37.139.128.94/fx/Doc72600331.exe and save it as Tkuwbsupuwlbnzddfmatiac.exe.exe. This downloaded executable is then immediately run, indicating the Excel file acts as a dropper for a secondary payload. The ClamAV detection name further supports this dropper functionality.

Heuristics 8

  • 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
  • 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://37.139.128.94/fx/Doc72600331.exe

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
d628b1b640d42d575ecfb1dc5858776e2b9489627eb40fcd76a073e668710663		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 1120 bytes
vbaProject_00.bin
774dafc1b051674ea1ebf933354a1ec8e2f8ca8238d65c244f998863181e82ff		 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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