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

Static analysis result for SHA-256 31d426a6f8d3aeb8…

MALICIOUS

Office (OLE) / .XLS

1.13 MB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-10-26
MD5: 9ab4897fe79569cc927fab675bcbc6dd SHA-1: dea13dd199625f665db18e06f49d4a3855fb7480 SHA-256: 31d426a6f8d3aeb86e729e203b0d99259e560c92c6df9bbb74daa414530c5e82
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 the exploitation of a known vulnerability in Microsoft Equation Editor. This exploit likely serves to deliver a secondary embedded PDF payload, as suggested by the POLYGLOT_CHILD_PDF_STATIC_TRIAGE heuristic. The VBA macros themselves do not contain executable statements, suggesting the malicious activity is initiated through the OLE object.

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
b6e108ebf5363b909026237d290c836f0b4439345492cafc42b744d9302ceaba		 ole-package OLE Ole10Native stream: MBD0000A513/Ole10nAtiVe 1334 bytes
polyglot_child_pdf_off00049e00.pdf
eae0d492813bb6e143da1789476f920cc751b1ee4827556223aeb3548c565e69		 polyglot-child-pdf Secondary PDF body inside ole container at offset 0x49E00 884224 bytes
polyglot_child_pdf_off00001000.pdf
93d9450545d9cecb1ecd085c2ce637108a8e114d302288d3cfccc250d3292d68		 polyglot-child-pdf Secondary PDF body inside ole container at offset 0x1000 1182720 bytes
polyglot_child_pdf_off00006200.pdf
ffc3576b94b38c41e197dbe70754671106a9a93b452dbd08ecc41f732a176387		 polyglot-child-pdf Secondary PDF body inside ole container at offset 0x6200 1161728 bytes
polyglot_child_pdf_off00009600.pdf
78f3ddb5e351058f99ecdda3b38a8fe2cf6f4fc3efc445be974da154ad04728e		 polyglot-child-pdf Secondary PDF body inside ole container at offset 0x9600 1148416 bytes

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