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

Static analysis result for SHA-256 efef679cdb0b2c24…

MALICIOUS

Office (OLE) / .XLS

393.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-11-11
MD5: 7b4e14201d03301239916757dd4f4a86 SHA-1: bd39724528ad9704634367a6aac671167b558fe0 SHA-256: efef679cdb0b2c24bdc7245c301f519f6a8be9b2aad6ff062761282255ed4064
108 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The critical heuristic firing indicates the presence of a CVE-2017-11882 Equation Editor exploit. This vulnerability is commonly used to execute arbitrary code, often leading to the download and execution of a secondary payload. No VBA macros were found to be executable, and the document body was not parsable, but the exploit itself is sufficient evidence of malicious intent.

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
f090632424d125ea807443a68b75bae02661ef02554563dae9c80528fee74000		 ole-package OLE Ole10Native stream: MBD0019989A/ole10NaTive 1444 bytes

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