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

Static analysis result for SHA-256 11bb7b732d4eef23…

MALICIOUS

Office (OLE) / .XLS

818.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-11-24
MD5: 8c2d887875f770dfd58f7f5f0dcec21a SHA-1: ae407eed4d13d299c3159c4d6aa274240b376c2d SHA-256: 11bb7b732d4eef23d595ba9d3f71252075d3ceac2d35ef073dde1012677d00fc
108 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.005 PowerShell

The critical heuristic firing for CVE_2017_11882_EQUATION_OLE10NATIVE indicates exploitation of this specific vulnerability. The OLE_EQUATION_EDITOR heuristic further confirms the presence of a malicious Equation Editor object. Although VBA macros were detected, they contained no executable statements, suggesting the primary execution vector is the Equation Editor exploit itself. The file is likely a downloader or dropper for a secondary payload.

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
9998bd749e9daabc54cc9b1762e9045e1252f80808b9460a9038a3779cd35fb9		 ole-package OLE Ole10Native stream: MBD024C27AF/oLE10NATIVe 1886 bytes

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