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

Static analysis result for SHA-256 652df9c24dcf0110…

MALICIOUS

Office (OLE) / .XLS

1.53 MB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2026-02-19
MD5: 8bc91ad6b9f122712139b36873545550 SHA-1: ae3da9deaceca79ee52d76fc492256038c5ec92d SHA-256: 652df9c24dcf0110dfcf26547cb1b60da7a52773c6959cb227e72dfdf3bd6e84
108 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is a Microsoft Excel file containing an embedded Equation Editor OLE object. Static analysis identified a critical heuristic firing for CVE-2017-11882, indicating that the embedded object exploits this known vulnerability. This vulnerability allows for the execution of arbitrary code, likely to download and run a secondary payload.

Heuristics 3

  • 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.

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
f27a122da81522386a043919bdd6505d271452448f6551d8a549a9cc3d64340b		 ole-package OLE Ole10Native stream: MBD00521DD3/ole10NATIVE 1714 bytes

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