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

Static analysis result for SHA-256 37eb0640c85ef74c…

MALICIOUS

Office (OOXML) / .XLSM

430.9 KB Created: 2021-08-19 14:03:52 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-03-15
MD5: 4b222ff63ba4a27646751b5dadfd3ed7 SHA-1: 4786533018798fbbb3083910b2459a80b3e60258 SHA-256: 37eb0640c85ef74c91b533f1fc7cc1ac9584d648330e105fb37b4231f885576c
402 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1059.005 Visual Basic T1204.002 Malicious File T1105 Ingress Tool Transfer

The Workbook_Open macro within this XLSM file utilizes WScript.Shell and PowerShell to execute a command. This command downloads a file from the URL "http://lostheaven.com.cn/wp-includes/BL-1600072563308pdf.exe" to the temporary directory and then executes it, indicating a downloader or dropper functionality.

Heuristics 9

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
  • PowerShell reference in VBA critical OLE_VBA_PS
    PowerShell 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
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • 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://lostheaven.com.cn/wp-includes/BL-1600072563308pdf.exe

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
ab217a871799f0c2e222d535a63e5a51af03463a40944d94b7f4497057995783		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 1266 bytes
vbaProject_00.bin
303f20dfe1d8e7b2b01b6f7ce4f3ca28bcfd2be96420cb4d8a38a100716e410b		 vba-project OOXML VBA project: xl/vbaProject.bin 5120 bytes
Detection
ClamAV: Xls.Dropper.EPPlus-9802867-2
Obfuscation or payload: unlikely

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