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

Static analysis result for SHA-256 70631d591d0a5e1a…

MALICIOUS

Office (OLE) / .XLS

848.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-11-18
MD5: e2219804904c5ef99cfb82b0f99d8eed SHA-1: c211ee9151f18a35ece2d5a1471a5de9a2f4f5a7 SHA-256: 70631d591d0a5e1ade9f6b04d4e40f754414dc74466723f3d9d0f3fba014ddaf
108 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File T1059.005 Visual Basic

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 exploit object strongly suggests the file's purpose is to leverage this vulnerability to execute a secondary payload. The file is an Excel spreadsheet, a common delivery mechanism for such exploits.

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
543927097c719cf4f8f9751b17359dc74f9b653a87fdddb9cb52d4f0f03081dd		 ole-package OLE Ole10Native stream: MBD00B025CD/Ole10NAtiVE 1805 bytes

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