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

Static analysis result for SHA-256 15f3b0ad3d04166a…

MALICIOUS

Office (OLE) / .XLS

397.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2026-06-04T05:00:00+00:00
MD5: b4bd01063d144d079c3eeeff2aa25f66 SHA-1: 93c6a6054cfd897adf95066a78fd5e7a1e268adb SHA-256: 15f3b0ad3d04166a268cecdf686ace1326a9096fcc4172bc29bca3c4ead4015d
108 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The critical heuristic firing indicates the presence of a payload exploiting CVE-2017-11882 within an embedded Equation Editor object. This vulnerability allows for arbitrary code execution when the document is opened. No VBA macros were found to be executable, and no other scripts or URLs were extracted, suggesting the primary malicious functionality relies on this exploit.

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
788936e53e8341b1995ff262ad261d2f39bd772918cf45cb92ed6ea0632bb56e		 ole-package OLE Ole10Native stream: MBD006B3891/OLE10NAtIvE 2263 bytes

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