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

Static analysis result for SHA-256 b4b59d3b8d088c43…

MALICIOUS

Office (OLE) / .XLS

411.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-10-28
MD5: 8fe0051f967d8276ff203606cc1a6b94 SHA-1: f1e715c8bd66f134a2963026e509668d310fd180 SHA-256: b4b59d3b8d088c432e5ce118f5c1483db4a0b96eb2ef4c0b64dc4760c6278688
108 Risk Score

Malware Insights

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

The critical heuristic firing for CVE_2017_11882_EQUATION_OLE10NATIVE indicates the presence of a payload exploiting this specific vulnerability. The OLE_EQUATION_EDITOR heuristic further supports this, suggesting the file contains a malicious Equation Editor object. Although the VBA macros themselves contain no executable statements, the embedded OLE object is the primary vector for exploitation.

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
693522a040f969cc9c9a557dc10dbc920956975bd6a5fb03dc570391dce73ab6		 ole-package OLE Ole10Native stream: MBD02A7F11E/Ole10nAtivE 1496 bytes

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