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

Static analysis result for SHA-256 30b3f1d53a961aeb…

MALICIOUS

Office (OLE) / .XLS

1.13 MB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-10-24
MD5: c6fe0de647279f8790eb117a98fb7f74 SHA-1: 06b89f8df71e576b900e10dbed4b90ae940ebb75 SHA-256: 30b3f1d53a961aebc4c6b31d1fa4dc34cfbb08187048b93352e9019865698c46
172 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious File T1059.005 Visual Basic

The sample is an Excel file containing a malicious Equation Editor OLE object that exploits CVE-2017-11882. This vulnerability allows for the execution of arbitrary code, and the embedded PDF also shows suspicious static findings. No VBA macros were found to be executable, and no URLs were identified as malicious.

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
fdd6d53dc6da4651dcffc62bf4c49785ffdd4c3c194a9ae35a33c1e1f21f1c06		 ole-package OLE Ole10Native stream: MBD000C8AD5/Ole10Native 1407 bytes
polyglot_child_pdf_off00049e00.pdf
44bb82a7fda5df9ddbf41749eaca71b814dc7cd8eaba2206767365833da5c2c0		 polyglot-child-pdf Secondary PDF body inside ole container at offset 0x49E00 884224 bytes
polyglot_child_pdf_off00001000.pdf
d24d53131f8f800bb41a3809e3cfb4c14822c551e2dba2d50f4463c20cf85a80		 polyglot-child-pdf Secondary PDF body inside ole container at offset 0x1000 1182720 bytes
polyglot_child_pdf_off00006200.pdf
f09d7f3c1db7157816ff89b5e31dd15058d5d449ef63d02ebba3f0c899e3435f		 polyglot-child-pdf Secondary PDF body inside ole container at offset 0x6200 1161728 bytes
polyglot_child_pdf_off00009600.pdf
97845ac2e45f981a77c679fa372b3b03dc90b271786fd6aa1d8582f05b25fdbe		 polyglot-child-pdf Secondary PDF body inside ole container at offset 0x9600 1148416 bytes

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