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

Static analysis result for SHA-256 4df32b8945e2b6be…

MALICIOUS

Office (OLE) / .XLS

90.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-01-19
MD5: cf33cd85b3d2cc91d411dc2f30da47fb SHA-1: 67c86eb5b04fb2b801a5ec1db40ce3426741d685 SHA-256: 4df32b8945e2b6bef2b0ba015f55b04bfad78c53d5023b70ed9eec4f67e2ed3d
108 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious File T1204.002 Malicious File: Malicious Attachment T1059 Command and Scripting Interpreter T1059.005 Command and Scripting Interpreter: Visual Basic

The sample is an Excel file containing an embedded Equation Editor object that exploits CVE-2017-11882. This vulnerability is known to be used to deliver arbitrary code execution, typically leading to the download and execution of a second-stage payload. No VBA macros were found to be executable, but the presence of the vulnerable OLE object is sufficient for exploitation.

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
77004feb27a7fecdebe813dddbcf18312eed5f82a6ad0a1558d1d582760758b2		 ole-package OLE Ole10Native stream: MBD026AFB87/OLe10NaTiVE 1568 bytes

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