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

Static analysis result for SHA-256 3ca1c4f45deef76f…

MALICIOUS

Office (OLE) / .XLS

569.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-11-16
MD5: 3f87a7ba6a0a7724f6a8edb551407450 SHA-1: 33198edb3b4c944d59124569809067e17da01ee3 SHA-256: 3ca1c4f45deef76fa979182c059e64e18b03c210d8f72d81adc4b2dc979cb90d
108 Risk Score

Malware Insights

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

The critical heuristic firing for CVE_2017_11882_EQUATION_OLE10NATIVE indicates that the sample exploits a known vulnerability in Microsoft Equation Editor. The OLE object containing the exploit payload was identified. No VBA macros were found to contain executable statements, and no scripts were extracted, suggesting the primary execution vector is the Equation Editor vulnerability itself.

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
c21897f723ddbae356767eef86dafe1ef075830770ce892e14d23a509a8ab528		 ole-package OLE Ole10Native stream: MBD00430731/ole10native 1484 bytes

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