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

Static analysis result for SHA-256 81abc14e1bdb88f5…

MALICIOUS

Office (OLE) / .XLS

176.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-03-15
MD5: 78f2534f391e34356e95ca07be90c8cf SHA-1: 8d52d669940f05ee1abc732958c8564da009b4e5 SHA-256: 81abc14e1bdb88f571ba0bfee228c8a34883e0cc3361283d7b99e04c0058f6d4
108 Risk Score

Malware Insights

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

The sample contains an embedded Equation Editor OLE object that is known to be vulnerable to CVE-2017-11882. This vulnerability allows for arbitrary code execution when the object is processed. Although the VBA project contains no executable statements, the presence of the vulnerable OLE object is sufficient to indicate exploitation for client execution.

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
85fe0b1cc32f3b86621bc1286a74914edf391c343ba2250b7a1d02f24e87124a		 ole-package OLE Ole10Native stream: MBD011FE1D6/oLE10nATIve 1788 bytes

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