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

Static analysis result for SHA-256 4fb8b2fa2c8f4c23…

MALICIOUS

Office (OLE) / .XLS

1.21 MB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2026-03-12
MD5: 240d00488cfad7811a412aee7d2d2b8d SHA-1: 4f42d37072667e44205da86911172a0b77387548 SHA-256: 4fb8b2fa2c8f4c234c2c82997a37bc48b65ba346efbbdb3f48c9d8e0f846ae07
108 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1566.001 Spearphishing Attachment T1204.002 Malicious File

The critical heuristic firing for CVE_2017_11882_EQUATION_OLE10NATIVE indicates the presence of a payload exploiting the Equation Editor vulnerability. The OLE_EQUATION_EDITOR heuristic further confirms the use of this object. Although the VBA project contains no executable statements, the embedded Equation Editor object is sufficient to deliver a malicious payload, likely leading to the execution of arbitrary code.

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
eecab9b21a39ffb05a1f02ce51d73695b35e4f627475ec283d1531a4b49a8a00		 ole-package OLE Ole10Native stream: MBD0016BA69/oLE10nATiVe 1919 bytes

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