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

Static analysis result for SHA-256 74d338fecb39bad3…

MALICIOUS

Office (OLE) / .XLS

535.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-11-07
MD5: 1c108f29d33de13fb59dbe7d3a736269 SHA-1: 8e4aa211ff20d80c9ba02a0de3a60604ba083e7f SHA-256: 74d338fecb39bad3ecb176361ebe917df795727d6769eaa483e427ddd337651d
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 Equation Editor OLE object further supports this finding. While VBA macros are present, they do not contain executable statements, suggesting the primary malicious functionality is within the Equation Editor 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
fffb9c06f63423ddc362d357f9dab34fc4a148e3a6d14b0c89f8d0c710f1334b		 ole-package OLE Ole10Native stream: MBD01032122/olE10NAtivE 1455 bytes

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