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

Static analysis result for SHA-256 b317746be65f640b…

MALICIOUS

Office (OLE) / .XLS

761.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-11-21
MD5: 7c72863c8a8f132ea8ffa2d722893b4a SHA-1: 8f31f881f55f96542dbcc90a4f826a64b4dc4b89 SHA-256: b317746be65f640bf759bf554376733822291f763c3e9cca49d0c8ac4892e251
108 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 User Execution: Malicious File

The critical heuristic firing for CVE-2017-11882 indicates the exploitation of a known vulnerability within the Equation Editor OLE object. This strongly suggests the file is designed to deliver a secondary payload upon opening. While no VBA macros were found to be executable, the presence of the OLE object is sufficient evidence 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
caa3dab2e36631aec526833d3b5f5f87ba41bde1e984eae7f80098666f36fbda		 ole-package OLE Ole10Native stream: MBD01D8E9D1/ole10natIVe 2056 bytes

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