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

Static analysis result for SHA-256 bf762651ad76713e…

MALICIOUS

Office (OLE) / .XLS

393.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-11-08
MD5: 3f410f39285af36abf7d4a788fb7d59c SHA-1: aba16f858e630244078f8d5c3d52b84ad88d4f9c SHA-256: bf762651ad76713e51dd3feb9181df535e146a50006d4e9487a7bf39eae3058e
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 the 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 was not parsable, 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
e60c355cd9479a3d502bdcf89d8aa7ac4c53e97b32e13e4e5fed2b7919d1cb63		 ole-package OLE Ole10Native stream: MBD0157827A/OLe10NATIVe 1214 bytes

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