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

Static analysis result for SHA-256 26d76d9ad5d5ed56…

MALICIOUS

Office (OLE) / .XLSX

156.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-10-10
MD5: 4a619f6597c59982c96a7e422d917c7c SHA-1: 1d571c8f6746ab456ca7a69caf0b13b344f87229 SHA-256: 26d76d9ad5d5ed566ab18b0d4a8527be163d8e998124fbb357ed7bdc4b38aa27
108 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1059.005 Visual Basic

The critical heuristic firing indicates the presence of a CVE-2017-11882 Equation Editor exploit within an OLE object. This vulnerability is commonly used to deliver second-stage malware. No VBA macros were found to be executable, and the document body was not parsable.

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
7f506327609c082af1cd37dde23bc2c71a000f7d1ef530b6abb66775040a7673		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 1206 bytes
ole10native_00.bin
3101d3c7d64daa316dd9dd7f7779305c552fa076a2652a15c135d5e08d3dc875		 ole-package OLE Ole10Native stream: MBD0136666C/oLe10naTivE 1920 bytes

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