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

Static analysis result for SHA-256 fb99736d2daf1549…

MALICIOUS

Office (OLE) / .XLS

207.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-04-18
MD5: 0dd68e0fc869e2e99c09c4b1bf803cb5 SHA-1: f8a4f3904e270404b1fc2d16e96f7c5fd4e7fec4 SHA-256: fb99736d2daf1549bef4960a9ce8918fa07edba09957cd596f86e3b79c9d4782
108 Risk Score

Malware Insights

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

The sample is an 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 be executable, but the presence of the vulnerable OLE object 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
948008ee5d96dc76152de9bf6f660c9955261d57a7d581fdfed119d6e28c4a37		 ole-package OLE Ole10Native stream: MBD017BE58D/oLE10nATive 1617 bytes

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