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

Static analysis result for SHA-256 b33866bbebdcdc09…

MALICIOUS

Office (OLE) / .XLS

536.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-11-07
MD5: 2bb06f6289571f2705992371f58c8249 SHA-1: b7de786cc88654c5c99cbdedd63b5adb634d5ed6 SHA-256: b33866bbebdcdc098574d2919d7b2bbeecf6053d22c596f552004deaa6f7b8b5
108 Risk Score

Malware Insights

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

The critical heuristic firing for CVE_2017_11882_EQUATION_OLE10NATIVE indicates that the file contains a payload exploiting this specific vulnerability. The presence of an OLE Equation Editor object further supports this. No VBA macros were found to be executable, and the document body was unreadable, suggesting the exploit is the primary mechanism for payload delivery.

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
28777e9ada0a21d6b06eeaa424162a69238f2204e8978e11ff5258417f72d5b7		 ole-package OLE Ole10Native stream: MBD0105AEE5/OLE10NATIVe 1606 bytes

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