Malicious Office (OLE) / .XLS — malware analysis report

Static analysis result for SHA-256 d91dd711d2b0724f…

MALICIOUS

Office (OLE) / .XLS

1.12 MB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-10-24
MD5: 79dd906fa8054f2a271dc5cdf84ffaa5 SHA-1: cbebc618ef559a097e5884f2669d8120676bb220 SHA-256: d91dd711d2b0724fd6db97c25c625abf2ad905b677c78695461479090e4afe47
172 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1559.002 Component Object Model Hijacking

The critical heuristic firing for CVE_2017_11882_EQUATION_OLE10NATIVE indicates the exploitation of a known vulnerability in Microsoft Equation Editor. This exploit likely serves to deliver a secondary embedded PDF payload, as suggested by the POLYGLOT_CHILD_PDF_STATIC_TRIAGE heuristic. The VBA macros are present but contain no executable statements, suggesting they are not the primary vector.

Heuristics 6

  • Equation Editor Ole10Native payload — CVE-2017-11882 critical CVE likely CVE_2017_11882_EQUATION_OLE10NATIVE
    An embedded Microsoft Equation 3.0 object (CLSID 0002CE02-0000-0000-C000-000000000046) carries an Ole10Native packager stream instead of the normal Equation Native/MTEF data. This is the weaponized Equation Editor RCE delivery shape used by CVE-2017-11882 / CVE-2018-0802 maldocs. The payload (font-record overflow + shellcode) is frequently encrypted and the stream name case-scrambled to evade scanners, but an Equation object holding an Ole10Native stream has no benign use.
  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Contains Equation Editor object — related to CVE-2017-11882 / CVE-2018-0802 exploitation, but CLSID presence alone is not the malformed MTEF exploit primitive.
  • Secondary embedded PDF body has suspicious static findings critical POLYGLOT_CHILD_PDF_STATIC_TRIAGE
    A valid PDF body was found at a nonzero offset inside another container and its carved contents matched PDF exploit or lure heuristics. This catches polyglots where the top-level magic routes to ZIP/OLE while a PDF reader or downstream parser opens the hidden PDF payload.
  • VBA project contains no executable statements low OLE_VBA_MACROS
    Document contains a VBA project, but extracted modules only contain attributes/options/comments and no executable statements.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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/xap/1.0/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/pdf/1.3/

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
7f506327609c082af1cd37dde23bc2c71a000f7d1ef530b6abb66775040a7673		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 1206 bytes
ole10native_00.bin
21e69228ac8090fad3964fa4f1b4f043ee064a355ca59c00523bf8e9ece9d77b		 ole-package OLE Ole10Native stream: MBD0014D320/olE10natIVe 1568 bytes
polyglot_child_pdf_off00047c00.pdf
fed8de6b69abdeeee751f572b799f36dc2d9658a5b7831f6f3a1f2e9662a9489		 polyglot-child-pdf Secondary PDF body inside ole container at offset 0x47C00 883200 bytes
polyglot_child_pdf_off00001200.pdf
0e810e1c439599c5589405c8a4829dc98007e45019a9da1ea8620cfaa94977a9		 polyglot-child-pdf Secondary PDF body inside ole container at offset 0x1200 1172480 bytes
polyglot_child_pdf_off00004200.pdf
4e9e2cb1923d71b4d8bf00c9cc3a61588911dc4b90706d5caf9b1407cc099fda		 polyglot-child-pdf Secondary PDF body inside ole container at offset 0x4200 1160192 bytes
polyglot_child_pdf_off00006800.pdf
6f1ae4d08d90fe7956578af2af4814f770a92110f65ba38ced1e2d89ca03f1fa		 polyglot-child-pdf Secondary PDF body inside ole container at offset 0x6800 1150464 bytes

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