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

Static analysis result for SHA-256 5df2f35be04bc465…

MALICIOUS

Office (OLE) / .XLS

844.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: a07f40d42527b0be89d40d15b24ac84f SHA-1: 493df4e270ddbc04f4f9afef3b26fe578b78ca06 SHA-256: 5df2f35be04bc465366f6e064f75783a033c35dc49c0f6bcaf91a965587337b8
108 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The critical heuristic firing indicates the presence of a payload exploiting CVE-2017-11882 within an Equation Editor OLE object. This vulnerability allows for arbitrary code execution when the document is opened. No VBA macros were found to be executable, and no other scripts or network indicators were extracted.

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
a5ea9b771aa9ecc23b0c6be717859dcbe92cc521a72a99b6905cb2a49cab64d1		 ole-package OLE Ole10Native stream: MBD01417114/OLE10NatiVE 1924 bytes

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