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

Static analysis result for SHA-256 223378996acf9521…

MALICIOUS

Office (OLE) / .XLS

569.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-11-16
MD5: 476d3cde1a7c3108ff78618bc9f348ed SHA-1: 2c5f2c8fd2ed5be1cb1b3b6f970058bb7260f877 SHA-256: 223378996acf95215d3b39ac9226ba78d59548f7dff37ad2edb6f7f44d08463f
108 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1204.002 Malicious File T1559 Component Object Model Hijacking T1559.001 Component Object Model Hijacking: COM Hijacking T1059 Command and Scripting Interpreter

The critical heuristic firing indicates the presence of a payload exploiting CVE-2017-11882 within an Equation Editor OLE object. While the VBA macros themselves contain no executable statements, the embedded OLE object is the primary vector for exploitation. This suggests the file is designed to leverage this specific vulnerability to execute a secondary payload.

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
3980eeed17f6ebc647ec57290ae422042dfe38004e6b219bff3de516f71bbcea		 ole-package OLE Ole10Native stream: MBD000B047C/Ole10NatiVE 1718 bytes

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