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

Static analysis result for SHA-256 648f7b2134410efd…

MALICIOUS

Office (OLE) / .XLS

1.54 MB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-12-05
MD5: c1e03f744cc7137ea3015c8aa9e873b9 SHA-1: 7c9e65ea58bfce9013a3f39077d97a4d52ba5810 SHA-256: 648f7b2134410efd05b3d100156b38b0b4fb0a73d520e9d173cdaa4459476d93
108 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is an Excel file containing an embedded Equation Editor object, which is a known vector for exploiting the CVE-2017-11882 vulnerability. This vulnerability allows for arbitrary code execution when the object is processed. 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
1d3b71b8c6234aace88f31f6e674b07383e015a2e68993dcd4fc2526aa470fe5		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 2412 bytes
ole10native_00.bin
93309482fc26e3b895e54c15fe3664afd262d216ff15b71e3a3b823666126ce9		 ole-package OLE Ole10Native stream: MBD00C7B7B2/Ole10Native 1458 bytes

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