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

Static analysis result for SHA-256 8e7618527c598229…

MALICIOUS

Office (OLE) / .XLS

1.59 MB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-12-10
MD5: 35af111bd1bc8ee2f63a3b0e377526ff SHA-1: 34ac11f6704e033dea5ee1049d4fca5501cf8d94 SHA-256: 8e7618527c598229899d7fcae8098c6031231acbcc9574061215b3658761c0aa
108 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The file is an Excel spreadsheet containing an embedded Equation Editor object that exploits CVE-2017-11882. This vulnerability allows for arbitrary code execution when the vulnerable Equation Editor component is loaded. The VBA macros are present but do not contain executable statements, indicating the primary malicious functionality relies on the Equation Editor 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
32dc940437e54847bd9b7c856c530a8a016b13ec86199cb9104d9ca5f32c5da2		 ole-package OLE Ole10Native stream: MBD004916A6/oLe10NATive 1786 bytes

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