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

Static analysis result for SHA-256 aeb5358b79fc25c4…

MALICIOUS

Office (OLE) / .XLS

339.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-07-31
MD5: 26baaa02eccd38684ba843ce0bfe1078 SHA-1: e677f77e05c9cd20dbd2ce81b83abce24ce9e98c SHA-256: aeb5358b79fc25c4e40f043a242cb3244c4f1cd5eb878c9c5fa404531de1d19f
132 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File: User Execution T1059.005 Service Execution: Visual Basic

The critical heuristic firing for CVE_2017_0199 indicates that the OLE object is designed to exploit a vulnerability to load remote content. The embedded URL points to a potential second-stage payload. The presence of a secondary embedded PDF with suspicious static findings further suggests a multi-stage attack. No VBA macros were found to be executable, but the OLE structure itself is the primary vector.

Heuristics 5

  • OLE2Link / URL Moniker → remote loader — CVE-2017-0199 critical CVE likely CVE_2017_0199
    Document contains an embedded OLE link object whose URL Moniker points to a remote URL. When the host file is opened, Office follows the link, downloads the URL, and processes the response based on its Content-Type (HTA -> mshta.exe, RTF → Word, etc.) — the documented CVE-2017-0199 primitive. The URL extension is not a reliable filter; servers can return different payloads to Office's user agent.
  • 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://93.183.73.20/FMC/000000000000000%23%23%23%23%23%23%23%23%23%23%23%23%23%23000000000000000000%23%23%23%23%23%23%23%23%23%23%23%23%23%2300000000000%23%23%23%23%23%23%23%230.Doc

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
7f506327609c082af1cd37dde23bc2c71a000f7d1ef530b6abb66775040a7673		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 1206 bytes
stream_003_off00005d60.bin
2998a126f4fa11ceb265371a5f7968ec18bc4692a32631a544232dc74040021f		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5D60 252488 bytes
polyglot_child_pdf_off00002600.pdf
abf7b79ae08d728e2889f02e88c4feed29b6136d9cfbb355c3ee9a8e8b13448e		 polyglot-child-pdf Secondary PDF body inside ole container at offset 0x2600 337408 bytes
polyglot_child_pdf_off00007a00.pdf
4cb7d1220554607729369f8e0da7cbab2d0c2d48a34e4ec86ca2f11b451caee6		 polyglot-child-pdf Secondary PDF body inside ole container at offset 0x7A00 315904 bytes

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