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

Static analysis result for SHA-256 34eb703bdb80b5da…

MALICIOUS

Office (OLE) / .XLS

207.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-06-21
MD5: bc95b1ec8eb4e7e2638f73d2a8406f9b SHA-1: ead258f348a4f2ce3b07a248375abc416d8aa443 SHA-256: 34eb703bdb80b5da9d40c51f6563ff7e6d12f5efbd3f0b2d4d4da6efda412124
108 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.005 PowerShell

The file contains an embedded Equation Editor OLE object that is known to be vulnerable to CVE-2017-11882. This vulnerability allows for the execution of arbitrary code when the object is processed. No VBA macros were found to be executable, and the document body is minimal, suggesting the primary attack vector is the exploitation of the Equation Editor vulnerability.

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
7f506327609c082af1cd37dde23bc2c71a000f7d1ef530b6abb66775040a7673		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 1206 bytes
ole10native_00.bin
1b08e45c7d20f26c5d55b7bcb0cb4fd41c4941f0d689bfff90976187811c6f71		 ole-package OLE Ole10Native stream: MBD00A7C2FF/ole10naTiVE 1903 bytes

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