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

Static analysis result for SHA-256 1801c1a472983dcb…

MALICIOUS

Office (OLE) / .XLS

1.59 MB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-01-27
MD5: 7fbaf6e599e346fe478384db2f23b32d SHA-1: e3d716fef30b198bd3892c83995f9a37e5f65f4f SHA-256: 1801c1a472983dcb25741c5e5ff34b3d62d358c68f7b420d211ab18c9c90f1f9
110 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, but the exploit itself is sufficient for initial compromise. The SHA256 hash is included as an IOC.

Heuristics 4

  • 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.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://schemas.openxmlformats.org/drawingml/2006/main

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
f8d079a5a504b7c543c858f8ca20aa13b73d227594da4a75688f0fe3e0683a5c		 ole-package OLE Ole10Native stream: MBD021CDE0A/OLE10NAtiVE 1610 bytes

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