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

Static analysis result for SHA-256 65a05590fb4b94e7…

MALICIOUS

Office (OLE) / .XLS

347.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-01-25
MD5: f138efe87edfdf3c00c056a0c15ab6be SHA-1: 6cd2eabe20498719b37bb5444d9ea73ff311e889 SHA-256: 65a05590fb4b94e7d0c0ee211536d467c72019a0b323f3e709b8356d9f2e3de7
110 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The file is an Excel spreadsheet containing an embedded Equation Editor OLE object. Static analysis identified a critical heuristic firing for CVE-2017_11882_EQUATION_OLE10NATIVE, indicating exploitation of this known vulnerability. This technique is commonly used to execute arbitrary code, likely to download and run a secondary payload.

Heuristics 4

  • 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.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://schemas.openxmlformats.org/drawingml/2006/main

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
e06b65592241adf6a8a45f68d95436f981ed36f0c380095f6d206932c638a513		 ole-package OLE Ole10Native stream: MBD01C17D07/oLE10NatiVE 1482 bytes

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