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

Static analysis result for SHA-256 c70ecb9d4c530ca4…

MALICIOUS

Office (OLE) / .XLS

617.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2026-02-26
MD5: c6e16c11b79284999e6e4c308055e284 SHA-1: 02b37fbad27a43af202d8bb3df4cc9d96988921f SHA-256: c70ecb9d4c530ca4379ad664e45529d6a795d9e5cd5b2e652d78ddf3523a5121
108 Risk Score

Malware Insights

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

The file is an Excel spreadsheet containing an embedded Equation Editor object. Static analysis identified a critical heuristic firing for CVE-2017-11882, indicating the exploitation of a known vulnerability within the Equation Editor component. This vulnerability is commonly used to deliver arbitrary payloads. No VBA macros were found to be executable, and the document body was unreadable, but the presence of the vulnerable OLE object is sufficient evidence of malicious intent.

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
3d4c407e4006f175e68d4e3a7036f0c48a024f3e5b7d16573b63c6592d61381e		 ole-package OLE Ole10Native stream: MBD005609E5/OLE10natIVe 1953 bytes

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