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

Static analysis result for SHA-256 1ff4b93749bc77ba…

MALICIOUS

Office (OLE) / .XLS

393.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-11-07
MD5: a862a9069c969c3997c54be20232e936 SHA-1: 7cdebb388f16b05560014ad7de8050a0391de3c5 SHA-256: 1ff4b93749bc77ba4f7a3f53b2fb3c917ec8b9e67a3ec4dc483efe6762d067a6
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. The presence of an OLE Equation Editor object further supports this finding. No VBA macros were found to be executable, suggesting the exploit is directly embedded within 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
186ed3e7c6bf0408a9211a130347e76a0bbf7548302ed82bb4641a783990e56d		 ole-package OLE Ole10Native stream: MBD01355A3D/OLe10naTivE 1535 bytes

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