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

Static analysis result for SHA-256 78db3edeb45a9848…

MALICIOUS

Office (OLE) / .XLS

1.52 MB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-03-15
MD5: 93f959f812ca137d8ddea1039fc0130e SHA-1: 9ef73bbd3144ac67acc01b2173449613a476b9ac SHA-256: 78db3edeb45a9848b0f4b9311565310ea938332125763a6338e6207eaed69eeb
110 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample contains an embedded Equation Editor OLE object that exploits CVE-2017-11882. This vulnerability allows for the execution of arbitrary code when the object is opened. No VBA macros were found to be executable, and the document body is minimal. The primary mechanism for compromise is the exploitation of the Equation Editor vulnerability.

Heuristics 4

  • 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.
  • 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.
  • 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 2

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
9eb7606ff32c5f64838b13fcd6d894d4cb11bf7d695be123a9df06234fd6563b		 ole-package OLE Ole10Native stream: MBD013211AC/olE10NAtIve 1635 bytes

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