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

Static analysis result for SHA-256 ec197e8b1475730b…

MALICIOUS

Office (OLE) / .XLS

1.55 MB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-12-06
MD5: 21f2f35e1dbb15d23b42df683f031c67 SHA-1: 31274255f4db8d5153668ccd2f8ffb1730e5d53a SHA-256: ec197e8b1475730b15e799ccc38cca8d6ffca376e99b2cc81d2fc33b428e4cd7
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 that exploits CVE-2017-11882. This vulnerability allows for the execution of arbitrary code upon opening the document. No VBA macros were found to be executable, and the document body is minimal, indicating the primary attack vector is the OLE object exploit.

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
2abffefc62cdd4a310737a125f318f74012c5a6520553ed9e64b5516bd361102		 ole-package OLE Ole10Native stream: MBD00E4D922/Ole10Native 1570 bytes

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