Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 5639f33cb34b2787…

MALICIOUS

Office (OOXML)

68.6 KB Created: 2021-07-28 13:23:45 UTC Authoring application: Microsoft Excel 16.0300
MD5: 7e5ae82300fa2821c374b45bd424e8f4 SHA-1: 0523a72c1ad04f12760134ab9cfdac4b6436b4d1 SHA-256: 5639f33cb34b278748a0a7e7dcca7c49cb0ea0b6d3c313dd81c4b02937c9816a
250 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File

The VBA macros contain critical heuristic firings for Shell(), WScript.Shell, and URLDownloadToFile, indicating an attempt to download and execute a second-stage payload. The URL 'https://github.com/florentbr/SeleniumBasic/releases/download/v2.0.9.0/SeleniumBasic-2.0.9.0.*' is referenced, likely serving as the source for this payload. The presence of these indicators strongly suggests a malicious intent to compromise the user's system.

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
bb9e24bbc4deadffdce0d6ccfc9613049c41825435e89d270b3d4e82f2da2c18		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 14171 bytes
vbaProject_00.bin
1418185008b61f08400bc23df7b15754628a42e40213b35babe486051330e0a3		 vba-project OOXML VBA project: xl/vbaProject.bin 64512 bytes

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