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

Static analysis result for SHA-256 53fb88f807010077…

MALICIOUS

Office (OLE) / .XLS

394.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-11-11
MD5: 6dfc860bfe88e4dcb1a7198a3e4ef72d SHA-1: 0857c527351221741bc21d5b4eeddcbb1cd22fa7 SHA-256: 53fb88f80701007731badcff73693dc57683033c63bd4d3411f9add2ba3dc2a8
108 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is an Excel file containing a malicious Equation Editor OLE object. Static analysis identified a critical heuristic firing for CVE-2017-11882, indicating exploitation of this vulnerability. No VBA macros were found to be executable, and the document body was not parsable. The primary attack vector is the exploitation of the Equation Editor vulnerability to achieve code execution.

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
99b77ca7baf6b2e92359eda607d834fe55e67fc2cc902193efd87fe50f09ac93		 ole-package OLE Ole10Native stream: MBD002F9D27/oLE10nATIVE 1869 bytes

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