Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 76a78aab3d3a4b71…

MALICIOUS

Office (OOXML)

69.5 KB Created: 2021-07-28 13:23:45 UTC Authoring application: Microsoft Excel 16.0300
MD5: 4f14004a9ef3d63e164d7c9a284a813b SHA-1: 38b4ea6f7f9ce7cbccdefd63be47570724c7d1d4 SHA-256: 76a78aab3d3a4b718d92aa64477f08ea6a8bdb5f81814dfa53e76aa0bf546416
250 Risk Score

Malware Insights

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

The VBA macros contain critical heuristic firings for Shell(), WScript.Shell usage, and URLDownloadToFile, indicating malicious intent to download and execute a payload. The script attempts to download a file from the provided GitHub release URL, which is likely the second-stage payload. The presence of these indicators strongly suggests a macro-based downloader.

Heuristics 7

  • 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
  • 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.*
    • https://developer.microsoft.com/en-us/microsoft-edge/tools/webdriver/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
4049ac68269a94607aa593d77d177c50767c4bc231a773394f4667d729febbed		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 14055 bytes
vbaProject_00.bin
75af19252046a29d09967480ccc5319950f3349735d5ed5df0bc7457c25374ec		 vba-project OOXML VBA project: xl/vbaProject.bin 67072 bytes

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