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

Static analysis result for SHA-256 39a8bfc0fdcb7b0d…

MALICIOUS

Office (OOXML) / .XLSM

363.2 KB Created: 2021-08-19 14:03:52 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2022-11-20
MD5: d47f953d6047e670becb5f7bcf57b61b SHA-1: 971a8366870e4c6fd62314de7d98627f0ecf54b2 SHA-256: 39a8bfc0fdcb7b0daa405987b09fe76dffa78d90ce26bdac42f44e7cfde743db
342 Risk Score

Malware Insights

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

The Workbook_Open macro executes a command to download a file from http://185.246.220.65/lee/IMG-07-94103.exe using certutil.exe and then executes the downloaded file. This indicates a downloader or dropper functionality, consistent with the ClamAV detection of 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://185.246.220.65/lee/IMG-07-94103.exe

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
6a94a196a4f8c1fbf42d0d5a879f3af0155c6f3f8f82e9249a067212ba039f0a		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 1117 bytes
vbaProject_00.bin
7c3830c53d61191c5ee62a12fcf9343dbdad85587cfc61315cbe7e30abbcff88		 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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