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

Static analysis result for SHA-256 f1337be32ef59e14…

MALICIOUS

Office (OLE) / .XLS

1.08 MB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-11-30
MD5: 1daf4b9978fa7a9853f5e1942077fefa SHA-1: 19b284f7a3f42bc2458c598564d009ee5d0fa3c5 SHA-256: f1337be32ef59e14dee706d55b05c1fd57601a5727402f64b50b116f66b90ea3
108 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Phishing: Spearphishing Attachment T1204.002 Malicious File: User Execution

The critical heuristic firing for CVE_2017_11882_EQUATION_OLE10NATIVE strongly indicates exploitation of this known vulnerability through an embedded Equation Editor object. While the VBA macros themselves contain no executable statements, the presence of the OLE object points to a delivery mechanism designed to leverage this specific exploit. The file is an Excel spreadsheet, suggesting it was likely delivered as a malicious attachment.

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
ed8da65f0f0a4cc2a905cfcf1ae916bf05ced375ebeefae9a837c8bf84ad6699		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 3618 bytes
ole10native_00.bin
bd09daeb0440b42a52d658edc4b424035dd1e39359f02006f92701fbe2aba3e8		 ole-package OLE Ole10Native stream: MBD0184CD74/OLe10NaTiVe 1543 bytes

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