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

Static analysis result for SHA-256 65c3c66a0986f5df…

MALICIOUS

Office (OLE) / .XLS

996.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-02-22
MD5: 8ef184d935f79299139e745c27431f8b SHA-1: 97fd8f7a8072ad6cf11db61b69673c8a21456873 SHA-256: 65c3c66a0986f5df0ccbcd352793cfcf73d3e870193e269a6a1402b8896d421e
110 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1204.001 Malicious Link: Malicious Link T1566 Phishing T1566.001 Phishing: Spearphishing Attachment

The file is an Excel spreadsheet containing a malicious Equation Editor OLE object, which exploits CVE-2017-11882. This vulnerability allows for the execution of arbitrary code, typically to download and execute a second-stage payload. No VBA macros were found to be executable, and the embedded URL was confirmed as benign.

Heuristics 4

  • 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.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://schemas.openxmlformats.org/drawingml/2006/main

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
aa7212c32103deee3a49a2cffd7cf39eef0eaa83f8c284d6537a0dad233ff3f0		 ole-package OLE Ole10Native stream: MBD00DACD3D/olE10NATiVe 1472 bytes

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