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

Static analysis result for SHA-256 612d0efc18bee9c4…

MALICIOUS

Office (OLE) / .XLS

1.38 MB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-01-25
MD5: 72fabcd2a13ea8dec32cfab0ebc3678d SHA-1: caf6ca9ab6b52a94a848db5871285fd2f5db5a2c SHA-256: 612d0efc18bee9c407d22ec6a02ecc13a0cbf23abb3cc1f2b52aa3ac84965d3e
110 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 known vulnerability. The embedded OLE object likely contains and executes a second-stage payload, leading to a compromise.

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
40e78f06abcdb881cd4fa1df4e47b0d590f7906baf03b6471beed5fe48b63fd9		 ole-package OLE Ole10Native stream: MBD01D0D8B9/OLE10NaTIvE 1755 bytes

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