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

Static analysis result for SHA-256 0fd5e881a9ed54f6…

MALICIOUS

Office (OLE) / .XLS

209.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-05-19
MD5: b2ef5fcc34a31e142e389a30bb679158 SHA-1: 213617681f4ef7678e0380d521ac2fa685ca5538 SHA-256: 0fd5e881a9ed54f69c35f9db17c4ea12fc7c10500b339a7fa11a695b4019954c
108 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is an Excel file containing a malicious Equation Editor OLE object. This object exploits the CVE-2017-11882 vulnerability, which is known to deliver a second-stage payload. No VBA macros were found to be executable, and the document body is minimal, indicating the primary attack vector is the embedded 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
7f506327609c082af1cd37dde23bc2c71a000f7d1ef530b6abb66775040a7673		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 1206 bytes
ole10native_00.bin
ffb0bc68fbc17e32926c3fccb0deae776628edd062d75796703552eb0e41ea92		 ole-package OLE Ole10Native stream: MBD02A5682D/OLE10naTIVE 1995 bytes

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