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

Static analysis result for SHA-256 bbfc938ddbb2f370…

MALICIOUS

Office (OLE) / .XLS

1.54 MB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-12-05
MD5: e94aa7f77a586b4fb6757917f46b267e SHA-1: be9584fde95d0a097b5721c6dad937c1a89faa7f SHA-256: bbfc938ddbb2f370930ce9c6d1d28a02a862a33d483e9ef402afabd3b3634aff
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 exploitation of a known vulnerability in Microsoft Equation Editor. While the VBA macros themselves appear empty, the presence of the Equation Editor OLE object strongly suggests this exploit is used to execute a secondary payload. The file's SHA256 hash is included as an indicator.

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
1b73b34f8474a9408427388973a7547d6e2146dca86c7ae0e01eaf55790e5def		 ole-package OLE Ole10Native stream: MBD00C35FDF/Ole10Native 1666 bytes

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