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

Static analysis result for SHA-256 f10cbd2e94145c1a…

MALICIOUS

Office (OLE) / .XLS

185.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-03-14
MD5: c0cc9a0f68fdec7adadf15f27c636e24 SHA-1: 85227ff69897b3373e33b18c1392f44ff505d5e9 SHA-256: f10cbd2e94145c1acd18cf5a28032c4bba9217dc6e0f7f4e8b437b26c8b556ba
108 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is an Excel file containing an embedded Equation Editor OLE object. Heuristics indicate this object exploits CVE-2017-11882, a known vulnerability allowing for arbitrary code execution. No VBA macros were found to be executable, and the document body is minimal, suggesting the primary attack vector is the Equation Editor exploit itself. The file's SHA256 hash is provided 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
61de47986639cb26360224ecadfc25622f96eb846027516d8c64b4422b1fbb5a		 ole-package OLE Ole10Native stream: MBD00D182B1/OlE10NAtIvE 1446 bytes

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