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

Static analysis result for SHA-256 9992e937b49d0c7b…

MALICIOUS

Office (OOXML) / .XLSM

27.3 KB Created: 2021-08-19 14:03:52 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2022-03-07
MD5: 9d86b2fb10c98bed4a3cd2aaf13955c2 SHA-1: 83ba3eb9b343ccf0bc45cf8f21b3acb9e92a89ab SHA-256: 9992e937b49d0c7bdfdc5ee7424ab5f67c98f4a4742f0557608d32cc61227b06
382 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 using cmd.exe to download a batch file from the URL http://13.112.233.199/share/78451000305.bat using certutil.exe, and then executes the downloaded file. This indicates a downloader or dropper functionality. The ClamAV detection of Xls.Dropper.EPPlus-9802867-2 further supports this assessment.

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://13.112.233.199/share/78451000305.bat

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
dbc6e08f9a1fe8ea2774a7a6cc4e9f0c09caf73c55023e8cea6dadb9c02084ae		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 1096 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
97008040a346cc6137219c81401f2aabb5c493a28d7eca61f4dd607acac2d2b3		 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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