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

Static analysis result for SHA-256 573fda1fd84bb5ba…

MALICIOUS

Office (OLE) / .XLS

875.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2026-03-14
MD5: 5509116cbf4a40b1e1994f2ca2030295 SHA-1: 8b689da98f2acb6440703d8b3da74fc91064bbbf SHA-256: 573fda1fd84bb5ba3fce19962a7da7a20c09cfae952c6c2c8340b9b352f943d1
108 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File: User Execution

The sample is an Excel file containing an embedded Equation Editor OLE object. Static analysis identified a critical heuristic firing for CVE_2017_11882_EQUATION_OLE10NATIVE, indicating the exploitation of this known vulnerability. The VBA project contains no executable statements, suggesting the primary malicious functionality is within the OLE object. The vulnerability allows for arbitrary code execution, likely to download and execute a second-stage 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
3a66d70eea067d3c46758b331e5bf1e7819c351c492424cbe3978ba61e188838		 ole-package OLE Ole10Native stream: MBD0131AE6C/OLe10NatIvE 1954 bytes

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