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

Static analysis result for SHA-256 c67987e6ca27fe6e…

MALICIOUS

Office (OLE) / .XLS

783.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-11-21
MD5: b4ee554ee5902456015a55e276c78997 SHA-1: e3c8ac2f2293edc9b1df0570519da4695bad444a SHA-256: c67987e6ca27fe6eb519e097b8e43935c87e9be18af0b8299efc7a42a0a31627
108 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The sample is an Excel file containing an embedded Equation Editor object that exploits CVE-2017-11882. The VBA macros are present but do not contain executable statements, indicating the primary malicious functionality is within the OLE object. The embedded OLE object is the likely vector for delivering a second-stage payload.

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
b5370db4211fd4e1afe2fa5330df94e3b772b2feed21be4d082e3ffa3427da33		 ole-package OLE Ole10Native stream: MBD01D6A1EC/OLE10NaTIVe 1546 bytes

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