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

Static analysis result for SHA-256 737dfe115cef42ea…

MALICIOUS

Office (OLE) / .XLS

393.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-11-10
MD5: d9f426bbd84094b209a5c9e9d88cde56 SHA-1: 4e343f23efe7d6128ead87e74eec84841b6dd74d SHA-256: 737dfe115cef42ea434ea61a4862f1f6157c5e16be0a4cc9bde977e5b4fa80a7
108 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.005 PowerShell

The critical heuristic firing for CVE_2017_11882_EQUATION_OLE10NATIVE indicates the exploitation of a known vulnerability in Microsoft Equation Editor. This vulnerability is commonly used to execute arbitrary code, often leading to the download and execution of further malicious payloads. No VBA macros were found to contain executable statements, suggesting the primary malicious functionality resides within the embedded 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
7f506327609c082af1cd37dde23bc2c71a000f7d1ef530b6abb66775040a7673		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 1206 bytes
ole10native_00.bin
d02ba512d302149cce3dd0659112fc13a50745c961800dfaa8c93bd9f23ffcad		 ole-package OLE Ole10Native stream: MBD01ABFC63/OlE10naTIvE 1281 bytes

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