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

Static analysis result for SHA-256 87bb4176f4839d95…

MALICIOUS

Office (OLE) / .XLS

1.36 MB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-11-30
MD5: 473426268c51c1aee94444d6bd3f5a12 SHA-1: e0ab29569ab92086870ddc8cebabbae536b390c1 SHA-256: 87bb4176f4839d95784e74ec262cddeaacf5eecf59fc79a5fa9614cf1ca17133
108 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The critical heuristic firing for CVE_2017_11882_EQUATION_OLE10NATIVE indicates that this file contains a payload exploiting the Equation Editor vulnerability. The presence of an OLE object containing an Equation Editor payload strongly suggests this is the primary attack vector. No VBA macros were found to be executable, and the document body was unreadable, leaving the Equation Editor exploit as the main indicator of malicious activity.

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
158031d093f77166d1905e369838b66775c0e6bc524b3e1c70af1ad7a2349266		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 4824 bytes
ole10native_00.bin
c3bc22c101d80100a02e98d1566ebbf84d9ce46119112ccdd044f73dd47141b2		 ole-package OLE Ole10Native stream: MBD0156C9B9/OlE10nAtIVE 2161 bytes

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