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

Static analysis result for SHA-256 1f965eaedfdc3030…

MALICIOUS

Office (OLE) / .XLS

861.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-02-27
MD5: 6394f2983dfe3385f3b6f5f763bd637b SHA-1: 63b950e334f1011317b39837a045a58542ce9121 SHA-256: 1f965eaedfdc303078ca0df5731760e9c052cfd1f572f768da4e99b588b18762
108 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The critical heuristic firing for CVE_2017_11882_EQUATION_OLE10NATIVE indicates that this Excel file contains a malicious Equation Editor OLE object. This object is designed to exploit the CVE-2017-11882 vulnerability, which allows for arbitrary code execution when the object is processed. No VBA macros were found to be executable, suggesting the primary attack vector is the embedded OLE object.

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
e43fe6ca3a8cc2718e108677b191f54fbf02b2e8cb12bfc974d1797bf078266b		 ole-package OLE Ole10Native stream: MBD018B82BE/OlE10NaTIVE 1705 bytes

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