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

Static analysis result for SHA-256 a7b0a7f76eb33c5f…

MALICIOUS

Office (OLE) / .XLS

1.64 MB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-08-03
MD5: f248664a470d20c243d35ef2a663d3bd SHA-1: 37079485559d41eca8522befc2c6b78ab9b878c0 SHA-256: a7b0a7f76eb33c5f67a43f9ae0174dd32c988cfe37f747be12b8c95f71352a96
272 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1204.001 Malicious Link: Malicious Link 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 PDF payload which, in turn, has a direct link to an executable or archive payload at the URL https://https://www.google.co.in/example.com. The VBA macros are present but contain no executable statements, indicating they are not the primary delivery mechanism.

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://ns.adobe.com/pdf/1.3/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/mm/

Extracted artifacts 9

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
720b0f5235e73e0c3869a0b13de109beaabf7afbed3a23ff9934a8c86217c916		 ole-package OLE Ole10Native stream: MBD0014FC14/Ole10nATive 1266 bytes
stream_003_off00005d60.bin
2998a126f4fa11ceb265371a5f7968ec18bc4692a32631a544232dc74040021f		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5D60 252488 bytes
font_02_sfnt_off00092d7d.bin
68d167e68895a344f3603a4efd0d8438eb8fdebe759cee48f2b4adf75c76c961		 pdf-font-stream PDF embedded font (sfnt) at offset 0x92D7D 12100 bytes
font_03_sfnt_off00094b95.bin
50551000b9f90b3f445ee94749557d9ddf96697a74984b3ccf3d2bae66910750		 pdf-font-stream PDF embedded font (sfnt) at offset 0x94B95 15820 bytes
polyglot_child_pdf_off00001200.pdf
24682cd8a405c4f1d0d1064bb78854a03974d7e263849b8111ae377bd60ec2b9		 polyglot-child-pdf Secondary PDF body inside ole container at offset 0x1200 1714688 bytes
polyglot_child_pdf_off00006600.pdf
40fc72fa0ec826f925257b31a2ce3a6bdb0b834bdeb18e46337f9453c513a004		 polyglot-child-pdf Secondary PDF body inside ole container at offset 0x6600 1693184 bytes
polyglot_child_pdf_off00029400.pdf
fb926a0fa16fca7ebdba112b500e938e01e18ebf3db2ddebe5ec66b5389e139e		 polyglot-child-pdf Secondary PDF body inside ole container at offset 0x29400 1550336 bytes
polyglot_child_pdf_off0003ec00.pdf
d855665557334aebec94b907d1b8552253f5c43d2797c9499d28317731535e85		 polyglot-child-pdf Secondary PDF body inside ole container at offset 0x3EC00 1462272 bytes

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