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

Static analysis result for SHA-256 8126aa90f564c166…

MALICIOUS

Office (OLE) / .XLSX

536.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-11-07
MD5: 1ec5e6588478d9336f48b25419a9c438 SHA-1: 89050c992186a5fef33fb5559565e3872dea879c SHA-256: 8126aa90f564c1662d9b42b333a7b0fe7489770c8b5069997b8dc5577ded2bc0
108 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious File T1204.002 Malicious File: Malicious Attachment T1059 Command and Scripting Interpreter T1059.005 Command and Scripting Interpreter: Visual Basic

The critical heuristic firing indicates the presence of a payload exploiting CVE-2017-11882 within an 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 to execute a secondary payload.

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
e6a9fd3f6f981787dc4ad6348f6e39814d6bd32f4d44c9204492cbdb7b53ffda		 ole-package OLE Ole10Native stream: MBD0104C996/Ole10NaTiVe 1625 bytes

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