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

Static analysis result for SHA-256 e6569c39662a739b…

MALICIOUS

Office (OOXML) / .XLSM

363.2 KB Created: 2021-08-19 14:03:52 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2022-11-18
MD5: 6cf622306bca91f4dbbc8fcb36372a42 SHA-1: b74446f7a3847a4309009a0b090ae25424d5c21b SHA-256: e6569c39662a739b44b71cae19bbe58afb75cb4dcbd6aa8bde846a191b1c0bf4
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 cmd.exe command to download a file using certutil.exe from the URL http://185.246.220.65/lee/IMG_56111807.exe and then executes the downloaded file. This indicates a downloader or dropper functionality, with the specific payload type yet to be determined.

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_56111807.exe

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
da50adae8240b7977d4c164b9e32d8ac07bb22fc367bd356ee482974860eafe2		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 1115 bytes
vbaProject_00.bin
69f86dc2c297a27beca7ab1e43466a2cb0536cbe886dc4a6d753f5d0f5acb813		 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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