Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 6435d8764b65e28d…

MALICIOUS

Office (OOXML)

69.5 KB Created: 2021-07-28 13:23:45 UTC Authoring application: Microsoft Excel 16.0300
MD5: 90d2d8d01e57f6d826c358339c51cb41 SHA-1: 9ec73e7997d34f3a1b651fc5803d3aba6390c4a6 SHA-256: 6435d8764b65e28dbc20279423777ec772496caf9ef041579cd7687d1b74c555
370 Risk Score

Malware Insights

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

The sample is an Office document containing VBA macros that utilize WScript.Shell and URLDownloadToFile to download an executable from a GitHub URL. The downloaded file is identified by ClamAV as 'Doc.Dropper.Agent-6412232-1', indicating it's a dropper for a second-stage payload. The macro's intent is to download and execute this payload, which is a common dropper behavior.

Heuristics 9

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
  • URLDownloadToFile in VBA critical OLE_VBA_DOWNLOAD
    URLDownloadToFile in VBA
  • ClamAV: Doc.Dropper.Agent-6412232-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Agent-6412232-1
  • 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.
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • VBA project inside OOXML medium OOXML_VBA
    Document contains a VBA project — VBA macros present
  • Environ() call (env variable access) low OLE_VBA_ENVIRON
    Environ() call (env variable access)
  • 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 https://github.com/florentbr/SeleniumBasic/releases/download/v2.0.9.0/SeleniumBasic-2.0.9.0.exe
    • https://developer.microsoft.com/en-us/microsoft-edge/tools/webdriver/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
839e17759e272513a1adbb545e2458e1888b86cee6696cf36c46cefbfb101a78		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 14072 bytes
vbaProject_00.bin
023de03737a81f65a20b2bcd02ec22070b97f437b48267f18f58b3fdc108f6df		 vba-project OOXML VBA project: xl/vbaProject.bin 66048 bytes
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely

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