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

Static analysis result for SHA-256 e462c2e718bfa6ae…

MALICIOUS

Office (OLE) / .XLS

393.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-11-09
MD5: 8ae69dcc1afb70ba34f63616bb56e28a SHA-1: 122a435b42c12a07863d39e654196d6fc45fab04 SHA-256: e462c2e718bfa6aee88e47dd18a938d8f8ffa3d0b10c5712916f358477d0e668
108 Risk Score

Malware Insights

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

The critical heuristic firing indicates the presence of a payload exploiting CVE-2017-11882 within the Equation Editor OLE object. While the VBA macros themselves do not contain executable statements, the embedded OLE object is the primary vector for exploitation. This suggests the file is designed to leverage this known vulnerability for initial 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
b6df1a3dff7f20a53be4071c780591b7621599a8d2fc8cc1c94766659cf0c3c5		 ole-package OLE Ole10Native stream: MBD01AB7F5A/Ole10nAtIVE 1310 bytes

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