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

Static analysis result for SHA-256 78135a0e18d31257…

MALICIOUS

Office (OLE) / .XLS

246.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-06-05
MD5: 96381e13b2a80b4ae71c632d059c9f12 SHA-1: 0aba523c5aede2dce0ba444a9e294e10affa2786 SHA-256: 78135a0e18d31257559a71cb6f67a7d90495bcb2ef45ebe01b7bc1718a2ae7ee
108 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is an Excel file containing a malicious Equation Editor OLE object. This object exploits CVE-2017-11882, a known vulnerability that allows for arbitrary code execution when the object is rendered. No VBA macros were found to be executable, and the document body is minimal, indicating the primary attack vector is the embedded exploit. The SHA256 hash is included as an IOC.

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
990566306fd9eddfccae2431b2fe5499d726afaf42c26e52cb016bc73f7bb7b5		 ole-package OLE Ole10Native stream: MBD000C71FE/ole10natiVe 2251 bytes

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