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

Static analysis result for SHA-256 ef745ad76f216686…

MALICIOUS

Office (OLE) / .XLS

209.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-07-03
MD5: ffdff2a8fa622cc05a7e5b82f152bc0b SHA-1: b95e2749286f805f13abe16ebe7a101b31787068 SHA-256: ef745ad76f216686b4ea14b1f6052403944913f5e3bead54b873d77965eab262
108 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is an Excel file containing an embedded OLE object that exploits the CVE-2017-11882 vulnerability in Microsoft Equation Editor. This vulnerability allows for arbitrary code execution when the object is processed. No VBA macros were found to be executable, but the presence of the Equation Editor exploit is a strong indicator of malicious intent.

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
1fe0e9f92ddd4ed930841c280e25d2a9eb618e85ceef87dad3c40c238da018db		 ole-package OLE Ole10Native stream: MBD0008CCA9/ole10natIVe 1767 bytes

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