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

Static analysis result for SHA-256 e8116c1cd3c13ef3…

MALICIOUS

Office (OLE) / .XLS

1.02 MB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-02-13
MD5: 0f30d4513865e75cb8544ad7306868b0 SHA-1: 70fa8b8c07efc1852a6012e9daa1028287665efb SHA-256: e8116c1cd3c13ef3df3e65970c68bbbf78984b7b977d9e0dd71172f7d501095c
110 Risk Score

Malware Insights

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

The sample is an Excel file containing a malicious Equation Editor OLE object. This object exploits the CVE-2017-11882 vulnerability, which is known to execute arbitrary code. No VBA macros were found to be executable, and no other scripts were extracted. The primary attack vector is the exploitation of the Equation Editor vulnerability.

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
2c2eccbdf1a47262a7771bf2c1692378df669e9088bffb3f5d8ab0aac8c0e2b2		 ole-package OLE Ole10Native stream: MBD00DE0BF7/OLe10NATIVE 1310 bytes

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