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

Static analysis result for SHA-256 0b5bebcdfa3c8d60…

MALICIOUS

Office (OLE) / .XLS

396.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2026-06-04T14:00:00+00:00
MD5: 5cb00c0ed0d7b0fd4a6301c8ebb22b44 SHA-1: 6af6b278cb3f940628f0357434f15f7b040b97e5 SHA-256: 0b5bebcdfa3c8d603303b25b6dcb5090d8819336469540d97594eb148fd9c4d5
108 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The critical heuristic firing indicates the presence of a payload exploiting CVE-2017-11882 within an embedded Equation Editor object. While the VBA project itself contains no executable statements, the embedded OLE object is the primary vector for exploitation. This suggests the file is designed to deliver a second-stage payload via this vulnerability.

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
1aae4f60d5ae76450dcbf19ccfa99fefe71cb70c67c36a1be2a93fd38e1b0a23		 ole-package OLE Ole10Native stream: MBD00479F37/ole10natIvE 1780 bytes

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