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

Static analysis result for SHA-256 97ae5934902311ad…

MALICIOUS

Office (OLE) / .XLS

535.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-11-07
MD5: 58cd1ab610e97320955a6311a1f8b7a9 SHA-1: 06c878ef568f96f8461c5ad72dfe5bd17938db4e SHA-256: 97ae5934902311ad8e16ec73dd1f562aea98b5e18763789806b61571c8448500
108 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.005 PowerShell

The critical heuristic firing indicates the presence of a payload exploiting CVE-2017-11882 within an embedded Equation Editor OLE object. While the VBA macros themselves contain no executable statements, the OLE object is the primary vector for exploitation. This suggests the file is designed to execute arbitrary code upon opening, likely leading to a secondary stage download or further compromise.

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
2920f6b7f402ebf8da620dbb7f415b2f7c906f1bbf348c7832f47bc54f11d7bf		 ole-package OLE Ole10Native stream: MBD0102384E/ole10naTivE 1452 bytes

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