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

Static analysis result for SHA-256 b81e9131290cfb88…

MALICIOUS

Office (OLE) / .XLS

455.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-02-01
MD5: 03ea4b4b0950a33412a15b9b86003e10 SHA-1: bb2e5cf955ec24d03166482a2b7b013a26294037 SHA-256: b81e9131290cfb8839d62a4c6d83e048d329c0659df12c962c9f9904c534ab1d
110 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample contains a critical heuristic firing for CVE-2017-11882, indicating exploitation of the Equation Editor vulnerability. This vulnerability is commonly used to execute arbitrary code, often leading to the download and execution of a secondary payload. No VBA macros were found to be executable, and the document body is minimal, suggesting the primary attack vector is the embedded OLE object.

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
    • http://schemas.openxmlformats.org/officeDocument/2006/relationships

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
2fcb71d66628642576f3feb5c81b3b46e956b7adac6620c241407ebfb07c2c10		 ole-package OLE Ole10Native stream: MBD0107FE45/OLe10nATIVE 1915 bytes

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