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

Static analysis result for SHA-256 b66c265b35372a58…

MALICIOUS

Office (OLE) / .XLS

1.53 MB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-12-10
MD5: 8fad80b104bd3234323be9171aed903f SHA-1: e1190346d14c15788685e77347a827f7086adb2c SHA-256: b66c265b35372a58775ab68db5392014be36b745f4647df6c3da1c0a7aab82fc
108 Risk Score

Malware Insights

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

The file is an Excel spreadsheet containing an embedded Equation Editor object that exploits CVE-2017-11882. While the VBA macros themselves do not contain executable statements, the Ole10Native payload within the Equation Editor object is the primary indicator of compromise. This exploit is known to deliver a second-stage payload, likely for further system 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
1d3b71b8c6234aace88f31f6e674b07383e015a2e68993dcd4fc2526aa470fe5		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 2412 bytes
ole10native_00.bin
fbc88ead5c45890a25808f2234603ce0c823c83e73b6bc3d11b530494d00a3b4		 ole-package OLE Ole10Native stream: MBD00449264/OlE10nAtiVE 1561 bytes

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