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

Static analysis result for SHA-256 d7218866b1b27bdc…

MALICIOUS

Office (OLE) / .XLS

861.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-02-28
MD5: f629266dc24158f90a26c008526cf49d SHA-1: 98da6d62d34165b43aae37659f845a46a73943b6 SHA-256: d7218866b1b27bdc3894b27099db7706318eb61408f178e0ca6ebd123d430ebe
108 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1059.005 Visual Basic

The critical heuristic firing indicates the presence of a payload exploiting CVE-2017-11882 within an Equation Editor OLE object. While no VBA macros were found to contain executable statements, the OLE object itself is indicative of a vulnerability exploit. This suggests the file is designed to leverage this specific Equation Editor flaw for initial compromise.

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
181e011cd6365f4c9dcba224a766e25837ccce0c9e712d0d82e1fb1e52e256a8		 ole-package OLE Ole10Native stream: MBD01A2E62A/Ole10natiVe 1545 bytes

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