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

Static analysis result for SHA-256 a4e1f819f8c869ff…

MALICIOUS

Office (OLE) / .XLSX

176.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-03-02
MD5: 39e031cac3d680b4370b089830760f95 SHA-1: 3b3e8eee017b1018a60c0cfcb7f0373d58e4733c SHA-256: a4e1f819f8c869ff33c7accc6fd306a272e6da0bfdc2afab5bc4e916b172d7f0
148 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is an Excel file containing an embedded Equation Editor OLE object, which is a known vector for exploiting CVE-2017-11882. This vulnerability allows for arbitrary code execution when the object is loaded. No VBA macros were found to be executable, but the presence of the vulnerable OLE object is sufficient for exploitation.

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.
  • x86 GetPC stub (CALL $+5; POP EBX) high SC_GETPC_CALL
    x86 GetPC stub (CALL $+5; POP EBX)
  • 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
548dbc72e50881ae17e4e96d8760755d7a9918d49adaf0048fe829d70fc9018e		 ole-package OLE Ole10Native stream: MBD00784FD7/OLe10nATive 1545 bytes

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