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

Static analysis result for SHA-256 abef267f772fe552…

MALICIOUS

Office (OLE) / .XLS

749.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-11-21
MD5: 90dae64cc4cccb9cbeb52574e81be6da SHA-1: abf2fe85bcaeddd688f0683956b7f3a537c5f241 SHA-256: abef267f772fe552b8eed7401885fad9f7d38086fc057f9196faa029f0457ed4
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 exploitation of a vulnerability in the Equation Editor. This suggests the file is designed to execute arbitrary code upon opening. No VBA macros were found to be executable, and the document body was not sufficiently extracted to determine a specific lure, leading to an unknown family classification.

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
c8b7087f256a00b892d736303c5eccf160027177bab15b6575e903e3644a795c		 ole-package OLE Ole10Native stream: MBD01D9F061/ole10naTIVe 2108 bytes

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