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

Static analysis result for SHA-256 00f334bf4c282f5e…

MALICIOUS

Office (OLE) / .XLS

157.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-05-30
MD5: 97111b1fd90d8f40b49f93373471f012 SHA-1: 28969a182c6a7f76b34467f49773e9ab5bc22d30 SHA-256: 00f334bf4c282f5e9cf02ef04139d03b7bffc22d1b05eea47fa279478f15c584
108 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is an Excel file containing an embedded Equation Editor object that exploits the CVE-2017-11882 vulnerability. This vulnerability allows for arbitrary code execution when the malicious object is processed. 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
a19bbe177940b09dcfc3d0b4bb74f880d15d20c21c010bffe1cd56927bef68df		 ole-package OLE Ole10Native stream: MBD01BAFE11/Ole10NAtIVe 1585 bytes

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