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

Static analysis result for SHA-256 305d84e55287d9df…

MALICIOUS

Office (OLE) / .XLS

1.11 MB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-09-14
MD5: 070c3a7209bef3933df6072d39590614 SHA-1: 91f4112e68399b29c6263588580083c8ddb43c27 SHA-256: 305d84e55287d9df2e1037340a32f712fec785c67416508044dff4f5db0b2e66
272 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1204.001 Malicious Link: Click T1566 Phishing T1566.001 Phishing: Spearphishing Attachment

The sample contains an embedded Equation Editor OLE object that exploits CVE-2017-11882. This object contains a secondary embedded PDF which has suspicious static findings and a direct link to a payload. The PDF also combines an external action with parser-evasion techniques, indicating a deliberate attempt to deliver a malicious payload.

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
34147d4487b976b43e1d94f7e9b0790ea653a37177ca621bb0a3cc25c64237ea		 ole-package OLE Ole10Native stream: MBD000C5AE2/OLE10NatiVe 1699 bytes
polyglot_child_pdf_off0005ea00.pdf
3513eb201d0d24352ee506d3954f3d600200e7fcbc1313e4be9cd6fbc2a6eaea		 polyglot-child-pdf Secondary PDF body inside ole container at offset 0x5EA00 781312 bytes
stream_003_off00005f60.bin
2998a126f4fa11ceb265371a5f7968ec18bc4692a32631a544232dc74040021f		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5F60 252488 bytes
polyglot_child_pdf_off00001000.pdf
9362e601ce6378419d4fe0956572c29435b85f96f711bf74423502b162d4204d		 polyglot-child-pdf Secondary PDF body inside ole container at offset 0x1000 1164800 bytes
polyglot_child_pdf_off00006600.pdf
a64a8c87bd4a8823588d54339284b139e236589297a7fe9fb7d65a942eda654b		 polyglot-child-pdf Secondary PDF body inside ole container at offset 0x6600 1142784 bytes
polyglot_child_pdf_off00029600.pdf
4d59308cb86d4b7b210c7c1c314acaa6f8d44e6bd1a0dfb97dff3cc28b7f59c5		 polyglot-child-pdf Secondary PDF body inside ole container at offset 0x29600 999424 bytes

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