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

Static analysis result for SHA-256 88c09ac314222899…

MALICIOUS

Office (OLE) / .XLS

165.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-02-20
MD5: c022a5e252c97d1abc93ef8174c3cde0 SHA-1: 499bd4198fe3b966a591a4552580771275566b6f SHA-256: 88c09ac3142228991a995ae6424a3edacba48637402a2adc014a2c43c8c21bbd
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 known to allow for arbitrary code execution when the malicious object is loaded. No VBA macros were found to be executable, and the document body contained only sheet names, 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
61cdae7c1bdf68d671ba3a46b5c1c96dff34a023f6d15b5c1214e2ee833b7235		 ole-package OLE Ole10Native stream: MBD0075D3D5/olE10nATiVe 1588 bytes

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