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

Static analysis result for SHA-256 91aa652ad839887a…

MALICIOUS

Office (OLE) / .XLS

838.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-02-28
MD5: 7be48d9c801faa3dd5a62321af3dcd83 SHA-1: 1709da7101b7a9768306d0121e21d12e041e15a7 SHA-256: 91aa652ad839887ae0c15a7877a87a62f588532f6c0480227b00b8ada2f18c34
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 the file contains a payload exploiting this specific vulnerability in the Equation Editor. The presence of an OLE object related to Equation Editor 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
ab26896ca06a14299b4503419d408d139f92e6d9004b6b46e6529b56390bb62a		 ole-package OLE Ole10Native stream: MBD01B57718/OLE10nATIVE 1846 bytes

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