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

Static analysis result for SHA-256 c914aee8676ede26…

MALICIOUS

Office (OLE) / .XLS

511.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-11-15
MD5: b63a31ddf3d77f9f481f818a7c4a0ad2 SHA-1: dd7e2f3c63c8de41cf88ed73f9675da27d7aca3c SHA-256: c914aee8676ede26d85780a7902aaeee1bae4d9bcb042447e081c8482b5de841
108 Risk Score

Malware Insights

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

The critical heuristic firing for CVE-2017-11882 indicates the exploitation of the Equation Editor vulnerability. While no VBA macros were found to contain executable statements, the presence of the OLE object strongly suggests an attempt to execute arbitrary code. The file's SHA256 hash is included as a primary indicator.

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
50903be752b1637ffae7b07bb95c03683e1b1558c2ba28b09af72f4e998ed363		 ole-package OLE Ole10Native stream: MBD017AEDBA/oLE10natiVe 1795 bytes

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