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

Static analysis result for SHA-256 d5a99c1554182e70…

MALICIOUS

Office (OLE) / .XLS

170.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-06-14
MD5: c1e33b70997fd6e8112dc14a0f2b056e SHA-1: a1666e38dab18082037b4e1f0e31c44f81a40339 SHA-256: d5a99c1554182e7057212eee6d9fd443c16483fcdb973ae6dbc28af067eb13c0
108 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1204.001 Malicious Link: Malicious Link T1566 Phishing T1566.001 Phishing: Spearphishing Attachment

The sample is an Excel file containing an embedded Equation Editor object that exploits CVE-2017-11882. This vulnerability allows for the execution of arbitrary code when the object is opened, typically leading to the download and execution of a second-stage payload. No VBA macros were found to be executable, and the document body was empty, indicating 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
7f506327609c082af1cd37dde23bc2c71a000f7d1ef530b6abb66775040a7673		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 1206 bytes
ole10native_00.bin
f88dbe7d33d01fa094a31a8c5c13f20e6cc1588dfc701b2adcf8eece4c4e7014		 ole-package OLE Ole10Native stream: MBD00F90100/Ole10NaTIvE 1422 bytes

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