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

Static analysis result for SHA-256 bbe692a2e3a3d94e…

MALICIOUS

Office (OLE) / .XLS

1.47 MB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-12-10
MD5: d4a70d7319bb1f557c56118b6c95fe8a SHA-1: afb4c057effd27223f2427623edb3d75dab5bbd1 SHA-256: bbe692a2e3a3d94ee85cc63b87e4a2999aa475de5c72494401459c4e22965bcc
108 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is an Excel file containing a malicious Equation Editor OLE object. This object exploits the CVE-2017-11882 vulnerability, which is known to allow arbitrary code execution. No VBA macros were found to be executable, and the document body was empty, indicating the exploit is the primary mechanism for payload delivery.

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
17314a62a84b5acb63d18a43228c7ca0a41d14689e89a3c7950e698fbf8f2710		 ole-package OLE Ole10Native stream: MBD003D594F/OLe10naTIVE 2061 bytes

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