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

Static analysis result for SHA-256 2c8f27475f538783…

MALICIOUS

Office (OLE) / .XLS

1.11 MB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-07-06
MD5: 66570101d7cfebc561c339e86fab904d SHA-1: 7f9d146356522783273fdfa954a14b022a2c1c62 SHA-256: 2c8f27475f53878362379d08fb44cbd5266404838841f855c0a8702fc3cdb854
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 exploitation of a known vulnerability in Microsoft Equation Editor. This is further supported by the presence of an embedded PDF file with suspicious static findings, suggesting it acts as a secondary stage. The VBA macros are present but contain no executable statements, indicating 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://ns.adobe.com/pdf/1.3/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/mm/

Extracted artifacts 8

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
11a2d1d04467f3d1cb3abab8e6b40ff1694c2e90935e7007e6006504092fa3e5		 ole-package OLE Ole10Native stream: MBD000FAC3D/OLe10naTiVe 1653 bytes
font_00_sfnt_off00012d55.bin
c770f9918a4512e864d5cb442b6b813020a99b29f560e058e4362ddfc8412387		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D55 11884 bytes
font_01_sfnt_off00014ac4.bin
dd457e884a659b63f960fd1c1b3ba45b073ca5832921ee06c6cae7a7d12bd11f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14AC4 15280 bytes
polyglot_child_pdf_off0006b200.pdf
e12a7aeaa3009e042358eef357945ed865cd8e6ada20db806f8755ce1aaec38e		 polyglot-child-pdf Secondary PDF body inside ole container at offset 0x6B200 729600 bytes
polyglot_child_pdf_off00001000.pdf
61ef69e6cc3b0094185fcf7929aad0b4ca987bb69caaf40b0e34cfce980065ce		 polyglot-child-pdf Secondary PDF body inside ole container at offset 0x1000 1164288 bytes
polyglot_child_pdf_off00006200.pdf
77891f8e4e359a19c266044c40fb4f5bbe870c325c091ff10391ac21b5c57618		 polyglot-child-pdf Secondary PDF body inside ole container at offset 0x6200 1143296 bytes
polyglot_child_pdf_off00008400.pdf
a9a1b646af162a07ffeb8832af35862cf17aaa5b6672fa7a9decef7f5f741096		 polyglot-child-pdf Secondary PDF body inside ole container at offset 0x8400 1134592 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.