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

Static analysis result for SHA-256 6f01ffd758dbda45…

MALICIOUS

Office (OLE) / .XLS

813.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-11-30
MD5: c196268a0bbe6cb62aa9a304e2a5eb89 SHA-1: a6621f62281c559c0ca622ac64a9330d540a1cea SHA-256: 6f01ffd758dbda45a940a7f396fc02e29d10ea1cba8d0dbc03f3902e97821c85
108 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The critical heuristic firing for CVE-2017-11882 indicates the exploitation of a vulnerability within the Equation Editor OLE object. This exploit likely serves as the initial vector for delivering a secondary payload. While VBA macros were present, they contained no executable statements, suggesting the primary execution mechanism is the OLE object vulnerability itself.

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
1d3b71b8c6234aace88f31f6e674b07383e015a2e68993dcd4fc2526aa470fe5		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 2412 bytes
ole10native_00.bin
09d73d06de1dd20d2997baf2e12e5e0adb3228b30de011017331e7cd0eb7924d		 ole-package OLE Ole10Native stream: MBD01531DA7/Ole10Native 1772 bytes

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