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

Static analysis result for SHA-256 504d7994ea8fcd72…

MALICIOUS

Office (OLE) / .XLS

849.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-11-17
MD5: facf5942346dce1d2033674cbc232fc9 SHA-1: c7b3e64640146c6fa748c40dae0aaf7aa1af9f85 SHA-256: 504d7994ea8fcd726f483e541a82fe42a6a0817f92af7df4f19fc71090128f5a
108 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 Malicious Link T1059.005 Visual Basic

The critical heuristic firing for CVE_2017_11882_EQUATION_OLE10NATIVE indicates the exploitation of a known vulnerability in the Equation Editor OLE object. This technique is commonly used to deliver secondary payloads. Although VBA macros were present, they contained no executable statements, suggesting the exploit is directly embedded within 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
1d3b71b8c6234aace88f31f6e674b07383e015a2e68993dcd4fc2526aa470fe5		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 2412 bytes
ole10native_00.bin
3c076294a59a0e0ad9096ee8e516a67cc41eac28ec4795507ceff987a9b960a1		 ole-package OLE Ole10Native stream: MBD0083CA18/Ole10Native 2032 bytes

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