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

Static analysis result for SHA-256 fbd729b0e631c574…

MALICIOUS

Office (OLE) / .XLS

616.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2026-02-26
MD5: a19e1f42aad15a1686a848858641522d SHA-1: f667d86e8231d95509ce49fe274d3745428a5170 SHA-256: fbd729b0e631c574a7296d9a6461cff10c4a53f7429eaf2b4841c0b7b0ac7d02
108 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1559.002 Component Object Model

The critical heuristic firing for CVE_2017_11882_EQUATION_OLE10NATIVE indicates that this Excel file contains a malicious Equation Editor OLE object exploiting CVE-2017-11882. No VBA macros were found to be executable, and the document body was unreadable. The primary attack vector is the exploitation of this known vulnerability.

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
8ffa5c8c5732115b95a88989d7a484d63a98c8cb25eb501222dacc4386bc5566		 ole-package OLE Ole10Native stream: MBD00961678/OLe10NATiVE 1978 bytes

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