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

Static analysis result for SHA-256 ab0fc2f4806066f6…

MALICIOUS

Office (OLE) / .XLS

187.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-03-09
MD5: 9752a1b54f89da4dab268eeb8f4842dd SHA-1: 1ef1da4af1ab8d6b97c707f93d15833d0130bc2b SHA-256: ab0fc2f4806066f6e3b17a04c6a619d6ad67661d410f8453efc6baffae2a4900
108 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The critical heuristic firing indicates the presence of a payload exploiting CVE-2017-11882 within an Equation Editor OLE object. This vulnerability is commonly used to achieve arbitrary code execution when the document is opened. No VBA macros were found to be executable, and the document body is minimal, suggesting the exploit is the primary attack vector.

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
9d4ae0113f7599224ad67ea6030a0090020642dbff8bacdecbfddcc3a50d684f		 ole-package OLE Ole10Native stream: MBD005E7A22/OlE10NaTive 1526 bytes

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