Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 be6b4d5cc5f20905…

MALICIOUS

Office (OLE)

165.5 KB Created: 2019-02-13 21:45:00 Authoring application: Microsoft Office Word
MD5: 7279321e93057186091894bdd7969091 SHA-1: 5d1cc3909ba70226860cfc87e4a671aa3e6e418a SHA-256: be6b4d5cc5f20905f1484561461801ce91207dea2fdf2f9dbbe02573ac2556fc
282 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1105 Ingress Tool Transfer T1566.001 Spearphishing Attachment

The sample contains VBA macros, including a Document_Open auto-execution routine, which is a common technique for malware delivery. The script utilizes CreateObject to instantiate 'scripting.filesystemobject' and 'microsoft.xmlhttp', indicating an intent to download and save a file to disk. This behavior is strongly indicative of a downloader or droppper malware.

Heuristics 8

  • 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.
  • ClamAV: Doc.Malware.Generic-6988714-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Malware.Generic-6988714-0
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_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 macros detected medium OLE_VBA_MACROS
    Document contains VBA macro code
  • 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
  • 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://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/photoshop/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/sType/ResourceEvent#
    • http://ns.adobe.com/xap/1.0/sType/ResourceRef#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/tiff/1.0/
    • http://ns.adobe.com/exif/1.0/
    • http://schemas.openxmlformats.org/drawingml/2006/main

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
cdab93f8449cd964baa62cdf969be6c8403e6e9f6559b396d36e0be71895636f		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 6268 bytes

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