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

Static analysis result for SHA-256 028c7c6974812b72…

MALICIOUS

Office (OLE) / .XLS

1.03 MB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-11-25
MD5: e4dbf42a38a4768e27533de709003149 SHA-1: 806d0fc26cec584e89f8a1e8372aed0896083753 SHA-256: 028c7c6974812b72b8c8b4220fc50c2cc3572a204541624d3978f8a49a8808a8
108 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is an Excel file containing a malicious Equation Editor object, which is a known vector for exploiting CVE-2017-11882. The embedded OLE object is identified as a payload for this specific vulnerability. No VBA macros were found to be executable, and the document body was not parsable, indicating the exploit is likely delivered directly via 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
ed8da65f0f0a4cc2a905cfcf1ae916bf05ced375ebeefae9a837c8bf84ad6699		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 3618 bytes
ole10native_00.bin
a0b3728b7f7df12c75a7694da205497f55dcfba5229c2d34683b04898b729912		 ole-package OLE Ole10Native stream: MBD02CF8DF2/Ole10NaTiVe 1848 bytes

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