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

Static analysis result for SHA-256 b1fd0e492e225326…

MALICIOUS

Office (OLE) / .XLS

170.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-06-12
MD5: 307e5ca11c7e007a59a1cfee7d87f18f SHA-1: ff2561cdf073f40a4ec04eaa8b504ab8a67b1e1c SHA-256: b1fd0e492e22532632f9bae2ae32841b3c14a5a73a4ac491e3af3b6868466c3d
108 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.005 PowerShell

The critical heuristic firing indicates the presence of a payload exploiting CVE-2017-11882 within an Equation Editor OLE object. While the VBA project contains no executable statements, the embedded OLE object is the primary vector for exploitation. This suggests the file is designed to leverage this known vulnerability for initial execution.

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
aae7b8101e45e5eb85b7fd0b90b56256aec7b2ef855b9e1d3b3735b177bf3097		 ole-package OLE Ole10Native stream: MBD0038A10C/ole10NATivE 1931 bytes

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