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

Static analysis result for SHA-256 7e1c04108960d9e7…

MALICIOUS

Office (OOXML) / .XLSM

27.3 KB Created: 2021-08-19 14:03:52 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2022-02-28
MD5: 7c806420561db001af1057d215e3e02c SHA-1: 8b1b11d3dc89187628e79d5ab1c4fb20d9f3f430 SHA-256: 7e1c04108960d9e729d34963b1541487bc29b232566a2b0e0abfb420d454645d
342 Risk Score

Malware Insights

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

MITRE ATT&CK
T1059.003 Windows Command Shell T1204.002 Malicious File T1105 Ingress Tool Transfer

The Workbook_Open macro executes a command using cmd.exe to download a file from the URL "http://13.231.238.12/board/BL_201207_0610_67.exe" using certutil and then executes the downloaded file. This indicates a dropper functionality, consistent with the ClamAV detection name Xls.Dropper.EPPlus-9802867-2.

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://13.231.238.12/board/BL_201207_0610_67.exe

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
ee567f298157067b160c67ad8ba8d6eec4801eaf7ef76f2f9ef3dd31990b7c4e		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 1107 bytes
vbaProject_00.bin
94978720199212d1076b152f4733ee30ec668afa46a94ae83b07940bcb425890		 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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