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

Static analysis result for SHA-256 c749595e9a90a739…

MALICIOUS

Office (OLE) / .XLS

1.03 MB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-11-25
MD5: 5bf6a6355aa87c0b503ac9483bdda694 SHA-1: 4b66e4a3ce22603d9e58893c33b023ffd1f96713 SHA-256: c749595e9a90a739657ba41098f9c3e50324f2199afbc8bedeeca02722645fcc
108 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The file is an Excel spreadsheet containing an embedded OLE object that exploits CVE-2017-11882 in the Equation Editor. This vulnerability is known to be used for delivering various malware payloads. No VBA macros were found to be executable, and the document body was unreadable, suggesting the exploit is solely reliant on 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
ed8da65f0f0a4cc2a905cfcf1ae916bf05ced375ebeefae9a837c8bf84ad6699		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 3618 bytes
ole10native_00.bin
76a4d29e824109577117c8e9a77af4c4c1788ff03465375090b738962be98c8d		 ole-package OLE Ole10Native stream: MBD02D57CD8/oLe10NatIVe 1622 bytes

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