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

Static analysis result for SHA-256 b628d31534985393…

MALICIOUS

Office (OLE) / .XLSX

209.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-05-23
MD5: 74a6d49923a7c45a109a63e9972a63e4 SHA-1: 28b2963a4581b4aa3b35f9801cc62ae84d18fc49 SHA-256: b628d31534985393dd0bb057e4f6c4824e6a2736cded15625342a11b1cbce618
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, which is known to be vulnerable to CVE-2017-11882. This vulnerability allows for arbitrary code execution when the object is processed. No VBA macros were found to be executable, but the critical heuristic firing indicates the exploit is present.

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
4619f4b8a4c16b13fd5260ac263247e7a5237a5af49ab1727dbc601640ba8dbb		 ole-package OLE Ole10Native stream: MBD00E2650A/ole10NatIve 1296 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.