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

Static analysis result for SHA-256 d66bc7fd9f24dcf9…

MALICIOUS

Office (OLE) / .XLS

1.03 MB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-11-23
MD5: e02848eb9256c23985ce2d92f1eb3fed SHA-1: 59070bd92b372770242c0d0fe7f1bfcf86df7e80 SHA-256: d66bc7fd9f24dcf99ceb2c76a3996903d94c260fff462dc2152c1e1d74e8a345
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. While the VBA macros themselves do not contain executable statements, the presence of the Equation Editor OLE object strongly suggests this is the primary attack vector. The file's purpose is to leverage this exploit for initial execution.

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
ed8da65f0f0a4cc2a905cfcf1ae916bf05ced375ebeefae9a837c8bf84ad6699		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 3618 bytes
ole10native_00.bin
22f9f1667c29481307065240f8d09449df11f869548622a10ae348a9f99d2125		 ole-package OLE Ole10Native stream: MBD0287BE72/OLe10nATIVe 1477 bytes

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