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

Static analysis result for SHA-256 f11ea7c681e86822…

MALICIOUS

Office (OLE) / .XLS

394.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-11-02
MD5: a36a5292707fc0bb40baeb6ff9f3668c SHA-1: f3e4369f8c04104e67cd6d05399fc7b78d143815 SHA-256: f11ea7c681e8682284ddfc51ac89247fd9a28ec1b0ad0aa19603d1bd8ed62837
108 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File Execution: Malicious File T1559.002 Component Object Model Hijacking: COM Hijacking

The critical heuristic firing for CVE-2017_11882_EQUATION_OLE10NATIVE indicates the file contains a payload exploiting this known vulnerability. The presence of an Equation Editor OLE object further supports this. No VBA macros were found to be executable, and the document body was unreadable, suggesting the exploit is delivered directly via the OLE object.

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
433eccf8c92bd789fa57a7ba17d7ee4a362d69103917d2806e1bd92693a20923		 ole-package OLE Ole10Native stream: MBD0025D2C1/oLe10nAtiVe 1754 bytes

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