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

Static analysis result for SHA-256 fe8caae955cb4d57…

MALICIOUS

Office (OLE) / .XLS

1.59 MB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-01-27
MD5: 52d31581da6a22afd5c669038ac3ee28 SHA-1: e0f9368e5c2c67bb331f6ab5a48b77a9bdc3363c SHA-256: fe8caae955cb4d57b0bd60f54e8f2add6ed8639c53cf558b535ce5164ba6df47
110 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is an Excel file containing an embedded Equation Editor object that exploits CVE-2017-11882. This vulnerability allows for the execution of arbitrary code, indicating the file is designed to deliver a malicious payload. No VBA macros were found to be executable, and the embedded URL was confirmed benign, suggesting the primary attack vector is the Equation Editor exploit itself.

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://schemas.openxmlformats.org/drawingml/2006/main

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
8a6e4587fcab1fa0c0bb609949d769afa09351e21f07a73722f65286502826c6		 ole-package OLE Ole10Native stream: MBD02016F87/olE10nATive 2071 bytes

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