Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 82e9dc6b4deeeb3d…

MALICIOUS

Office (OOXML)

21.7 KB Created: 2020-06-16 14:34:34 UTC Authoring application: Microsoft Excel 16.0300
MD5: 041b41bcbdf164df40a193c03c20d197 SHA-1: 6c6cadf53aee60057fc338eeb31b8ad40da0326a SHA-256: 82e9dc6b4deeeb3d146a2e22a1443a16b49feeb70259c1505e713d7a5b549928
290 Risk Score

Heuristics 9

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • VBA downloads and writes a file to disk critical OLE_VBA_HTTP_DROP_EXEC
    VBA reads an HTTP response body and writes it to disk (ADODB.Stream SaveToFile). Combined with the auto-exec/Shell paths this is a download-drop dropper even when the COM ProgIDs are built dynamically to evade keyword scanning.
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC
    Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
  • VBA project inside OOXML medium OOXML_VBA
    Document contains a VBA project — VBA macros present
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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://secure.eicar.org/eicar.com

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
71cfdaa5c8f9c63b879a94d756b02f70537d3e2ce93d0d4fd716f2c7025aee1a		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 3863 bytes
vbaProject_00.bin
bb67e5de394791f47866a86b8f2734b231a59995a3ba6f15d0918b7ee56754de		 vba-project OOXML VBA project: xl/vbaProject.bin 19456 bytes

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