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

Static analysis result for SHA-256 80edba90001d842c…

MALICIOUS

Office (OLE) / .XLS

165.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-02-20
MD5: da0142e7578217f9a1f57080d6786e15 SHA-1: b8e72c2e56fba262a1ef75a2089146d6e5134724 SHA-256: 80edba90001d842c718755c7bbdaf39a2ae795b9f0315a3c3e110b466013e4e7
108 Risk Score

Malware Insights

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

The sample is an Excel file containing an embedded Equation Editor OLE object that exploits CVE-2017-11882. This vulnerability allows for arbitrary code execution when the object is rendered. Although no VBA code was found to be executable, the presence of the vulnerable OLE object indicates an attempt to exploit this known vulnerability for initial access.

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
b8c78a8f7dddc272fc81573dc08ceb25f96cd578cc9dc6e6cb579fa79639983c		 ole-package OLE Ole10Native stream: MBD004A0313/oLE10NaTiVE 1657 bytes

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