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

Static analysis result for SHA-256 01519730bd75d8b9…

MALICIOUS

Office (OLE) / .XLS

56.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-02-27
MD5: 0a3dec7e68436b030743b39290c05735 SHA-1: 1fcc7a542d295810b1f48952394224e76c9ba4b0 SHA-256: 01519730bd75d8b900f4a7b6e39b9589db0dacd4c5670ea5edc01ae997d721b4
108 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.005 Visual Basic

The sample is a Microsoft Excel file containing an embedded Equation Editor object that exploits the CVE-2017-11882 vulnerability. This vulnerability allows for arbitrary code execution when the object is processed. No VBA macros were found to contain executable statements, but the presence of the vulnerable OLE object is sufficient for exploitation.

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
1f4b04c77d40a6a44c137b83d7dede86df0b53403fdcbd8a5a37df1888000565		 ole-package OLE Ole10Native stream: MBD017CCDFB/Ole10nATIve 1833 bytes

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