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

Static analysis result for SHA-256 dc5bd8b3505d3668…

MALICIOUS

Office (OLE) / .XLS

1.12 MB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-10-11
MD5: 0900dd308506ce307ecc09381dba7d05 SHA-1: 12d144b7c55c3d05e832632ccfb47c0a2005d65b SHA-256: dc5bd8b3505d3668d205cc448c2b53e36de98c9308af92cfbee0e91bbe0043d3
272 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1566.002 Spearphishing Attachment T1059.005 Visual Basic T1204 User Execution

The sample is an Excel file containing an embedded Equation Editor OLE object that exploits CVE-2017-11882. This object contains a secondary PDF payload which has suspicious static findings and a direct link to an executable payload. The embedded URL, https://https://www.google.co.in/example.com, is likely used to download and execute a second-stage 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 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
5e43ed4439c723a16d67e55c91e1a70a6232a22900190d8bbb1dfece0be53c87		 ole-package OLE Ole10Native stream: MBD0000A11F/OlE10nAtIVe 1829 bytes
polyglot_child_pdf_off00075000.pdf
626e7aa899696161baed05c78195cf992bda94abcaa83a76bae3426b6783a6bb		 polyglot-child-pdf Secondary PDF body inside ole container at offset 0x75000 700416 bytes
stream_004_off00005f60.bin
2998a126f4fa11ceb265371a5f7968ec18bc4692a32631a544232dc74040021f		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5F60 252488 bytes
font_01_sfnt_off0002b17d.bin
68d167e68895a344f3603a4efd0d8438eb8fdebe759cee48f2b4adf75c76c961		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2B17D 12100 bytes
font_02_sfnt_off0002cf95.bin
50551000b9f90b3f445ee94749557d9ddf96697a74984b3ccf3d2bae66910750		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2CF95 15820 bytes
polyglot_child_pdf_off00001200.pdf
8337996d47fc39c7f8dd5685c2643f8bda765594eef9c03049fa39671df683e9		 polyglot-child-pdf Secondary PDF body inside ole container at offset 0x1200 1175040 bytes
polyglot_child_pdf_off00006800.pdf
11c0faa1dd7d458f92b526125c7eb21d3b5e824aa3dbf987cea670466307fd5b		 polyglot-child-pdf Secondary PDF body inside ole container at offset 0x6800 1153024 bytes
polyglot_child_pdf_off00029400.pdf
679de18307f71cfdb4474453486bde587151e5dab6c8c09b7e79519bd91d7cb8		 polyglot-child-pdf Secondary PDF body inside ole container at offset 0x29400 1010688 bytes

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