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

Static analysis result for SHA-256 4fbd9aad2f65cd5e…

MALICIOUS

Office (OLE) / .XLS

1.11 MB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-09-21
MD5: a07fc73d08d1cf4779e3ea62998b7b9b SHA-1: 9152263de49c761a5652c4a4daaaccf27af9bb80 SHA-256: 4fbd9aad2f65cd5e6f0c4df01566cfef74f9a6209d44ed0ba9e7cd8c04ff034f
272 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1566.001 Spearphishing Attachment T1204 User Execution

The file is an Excel document containing an embedded Equation Editor OLE object that exploits CVE-2017-11882. This object contains a secondary PDF payload which, in turn, has a direct link to an executable or archive. The VBA macros are empty, indicating the exploit is solely within the OLE object and the embedded PDF.

Heuristics 8

  • 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.
  • PDF link points directly to executable/archive payload critical PDF_DIRECT_PAYLOAD_LINK
    PDF contains a clickable HTTP(S) URI whose path ends in an executable, script, shortcut, disk image, or archive extension. Documents can legitimately link to installers, so this is a high-risk delivery indicator rather than a standalone exploit fingerprint.
  • Clickable PDF combines external action with parser-evasion structure high PDF_ACTION_PARSER_EVASION
    PDF has an external clickable URI together with object graph or xref structures that make parsers disagree, such as divergent duplicate objects, parser divergence, or xref offset mismatch. That combination is stronger than a plain link: the document is both an outward-action carrier and a parser-confusion/evasion sample.
  • 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 https://https://www.google.co.in/example.com
    • 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 7

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
c3f5d792736d877a0d530e8e97668ae7ca440215637f0187be4fb09c3c61cb5b		 ole-package OLE Ole10Native stream: MBD000E8DA0/ole10nATiVE 1133 bytes
polyglot_child_pdf_off0005ea00.pdf
de6ffd6442de272dbd99657fa0c11c3f97cc6ed2289ae6e688a22d57308f0aef		 polyglot-child-pdf Secondary PDF body inside ole container at offset 0x5EA00 780800 bytes
stream_003_off00005f60.bin
2998a126f4fa11ceb265371a5f7968ec18bc4692a32631a544232dc74040021f		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5F60 252488 bytes
polyglot_child_pdf_off00001000.pdf
d9d92d24151a10a89200e22ea56322f0d3a210d9eb9977714879f9911eeb124e		 polyglot-child-pdf Secondary PDF body inside ole container at offset 0x1000 1164288 bytes
polyglot_child_pdf_off00006600.pdf
ecd89f876a53b3940807ab6fdce401363ac3561e93db813f0a5d050a14d5d016		 polyglot-child-pdf Secondary PDF body inside ole container at offset 0x6600 1142272 bytes
polyglot_child_pdf_off00029600.pdf
ed5d8a4850cffa25a834c91827c5ecad8b28f9f7be537c5ec3731960224ac166		 polyglot-child-pdf Secondary PDF body inside ole container at offset 0x29600 998912 bytes

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