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

Static analysis result for SHA-256 12d9f677ce3ebfcc…

MALICIOUS

Office (OLE) / .XLS

1.54 MB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-12-05
MD5: 843c4da4aee00e6b09c25094ea9d58d3 SHA-1: 1d28b92e837b25bd521fd6658380284112a2ceb3 SHA-256: 12d9f677ce3ebfccf60ffa363ee78d8de4e7846f1511a67c25b84bdcb25edad7
108 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is an Excel file containing an embedded Equation Editor object, which is a known vector for exploiting CVE-2017-11882. The critical heuristic firing confirms the presence of a payload within this object, indicating an attempt to achieve arbitrary code execution. No VBA macros were found to be executable, and the document body is minimal, suggesting the primary attack relies on the Equation Editor vulnerability.

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
1d3b71b8c6234aace88f31f6e674b07383e015a2e68993dcd4fc2526aa470fe5		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 2412 bytes
ole10native_00.bin
a69d746e9001ecc440807d4d3a229d419aee6da124b105fcc4740d8ba54ee943		 ole-package OLE Ole10Native stream: MBD00B62C28/Ole10Native 1800 bytes

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