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

Static analysis result for SHA-256 0dc032773fcd46cb…

MALICIOUS

Office (OLE) / .XLS

767.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-11-22
MD5: 1386ac45bf24674e54afe9d9ad17ba99 SHA-1: 7bc2a2851be05400e25ee5aef9d83b6aa94b49df SHA-256: 0dc032773fcd46cb01cb0afb9767385732782a4a4b1ad1ab79455f7480031ab6
108 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is a Microsoft Excel file containing an embedded Equation Editor object that exploits CVE-2017-11882. This vulnerability allows for the execution of arbitrary code, indicating a likely exploit delivery mechanism. No VBA macros were found to contain executable statements, and the document body was unreadable, suggesting the primary malicious functionality resides 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
1d3b71b8c6234aace88f31f6e674b07383e015a2e68993dcd4fc2526aa470fe5		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 2412 bytes
ole10native_00.bin
667716f681f970f8e90cc44fbcf39853882026c784a1cf23dbd823083592991e		 ole-package OLE Ole10Native stream: MBD0203AB37/Ole10Native 1432 bytes

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