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

Static analysis result for SHA-256 3b06c03d03d40331…

MALICIOUS

Office (OLE) / .XLS

848.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-11-18
MD5: 503bbe562e6a899c781260ca57db8053 SHA-1: b5b6633bd9dd674a6cad971061f9fbd97525a679 SHA-256: 3b06c03d03d4033108a80ed3d039f8fe56700418eea3824dd94a64635bf552dc
108 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The critical heuristic firing for CVE_2017_11882_EQUATION_OLE10NATIVE indicates that this XLS file contains a malicious Equation Editor object exploiting CVE-2017-11882. This vulnerability allows for arbitrary code execution when the object is processed. The VBA macros were found to contain no executable statements, suggesting the exploit payload is directly embedded within the OLE object.

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
f8b163bcc9f5c1ce37a13166ed01a4c58024e2aea8da1a2c33d2b52801f7e40f		 ole-package OLE Ole10Native stream: MBD00B93996/oLE10NATivE 1523 bytes

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