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

Static analysis result for SHA-256 95f0205a955d5a14…

MALICIOUS

Office (OOXML) / .XLSM

431.1 KB Created: 2021-08-19 14:03:52 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2022-04-14
MD5: 90e221a52004d2c4c49adcab3a177b30 SHA-1: 8c9d0ab662874251ada4b0ed1769705e332e8fb9 SHA-256: 95f0205a955d5a14d884049ffab0f18444631c81c615358bd8b3e4e4337980c0
382 Risk Score

Malware Insights

MITRE ATT&CK
T1059.003 Windows Command Shell T1204.002 Malicious File T1059.005 Visual Basic T1105 Ingress Tool Transfer

The embedded VBA macro contains a Workbook_Open event that executes a command using cmd.exe. This command utilizes certutil.exe to download a batch file from 'http://20.40.97.94/t7b/loader/uploads/BPL_1433572_007.bat' and then executes it. This indicates the document is a dropper designed to fetch and run a second-stage payload.

Heuristics 9

  • 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
  • Suspicious extracted artifact high EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • VBA project inside OOXML medium OOXML_VBA
    Document contains vbaProject.bin — 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://20.40.97.94/t7b/loader/uploads/BPL_1433572_007.bat

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
4fdf89d8b59c2e95006354175d8a089b208072e8972228a78a035a0c00b67216		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 1136 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.
vbaProject_00.bin
394617ccaa0c8333d88e7589da9293a3069cb43846850da3070da80438d5358d		 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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