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

Static analysis result for SHA-256 84379bc1903b7d32…

MALICIOUS

Office (OLE) / .XLS

805.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2026-03-11
MD5: 25c4a2e136fc6cb50b320145453fe6b1 SHA-1: 53716d550c5cc872617006a26420d5b7277e5d39 SHA-256: 84379bc1903b7d32f76e375a7c5d07c6feec8daeeb0615c0281ac3448e2054b3
108 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File: User Execution T1559.002 Component Object Model Hijacking

The sample is an Excel file containing a malicious OLE object that exploits CVE-2017-11882 in the Equation Editor. This vulnerability allows for arbitrary code execution when the object is processed. No VBA macros were found to be executable, and the document body was not parsable. The primary indicator of compromise is the exploitation of this specific CVE.

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
f2da8d10381a32563db9c58df66260722124a866867038990262bd53b3ad0cae		 ole-package OLE Ole10Native stream: MBD00BEFBF3/Ole10NAtIvE 2061 bytes

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