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

Static analysis result for SHA-256 0e8f31c511f0c4d2…

MALICIOUS

Office (OLE) / .XLS

1.54 MB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-12-06
MD5: 278bd1188d5eb79992f50301e9c04011 SHA-1: 7f067b15020d3bd92b2c81ec9544a331e31bca8d SHA-256: 0e8f31c511f0c4d2ab952cf42f4b6e2d21ed4612c054873a098e1075c8c76909
108 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.005 Visual Basic

The sample is a Microsoft Excel file containing an embedded Equation Editor object, which is known to be vulnerable to CVE-2017-11882. The critical heuristic firing confirms the presence of a payload within this object, indicating exploitation for client execution. No VBA macros were found to contain executable statements, but the presence of the vulnerable OLE object is sufficient for exploitation.

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
1d3b71b8c6234aace88f31f6e674b07383e015a2e68993dcd4fc2526aa470fe5		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 2412 bytes
ole10native_00.bin
ae61f4f49c6b5678ef2db2f96e0a1404c19326aee3614d72b69e8a7e80523eaa		 ole-package OLE Ole10Native stream: MBD00B1B1C9/Ole10naTiVE 1554 bytes

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