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

Static analysis result for SHA-256 f0ac288937859a48…

MALICIOUS

Office (OLE) / .XLSX

936.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-02-22
MD5: 45defca46b840dea33e8ade6ca8430fb SHA-1: f214f47050392a17acc4d123535fbaa40ad2d208 SHA-256: f0ac288937859a484f485be31cb7955004a05ef9dc9285241943b129e3802c84
108 Risk Score

Malware Insights

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

The sample is an Excel file containing an embedded Equation Editor OLE object. Heuristics indicate this object exploits CVE-2017-11882, a known vulnerability in Microsoft Equation Editor. While the VBA project itself contains no executable statements, the embedded Ole10Native payload is the primary indicator of compromise, leveraging this specific 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
7f506327609c082af1cd37dde23bc2c71a000f7d1ef530b6abb66775040a7673		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 1206 bytes
ole10native_00.bin
6addbb6de075cd4ae4f4aa5ce8f78fa6458274b6785e5bf0e4840ad76d6b6771		 ole-package OLE Ole10Native stream: MBD0113315A/Ole10NAtiVe 893441 bytes

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