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

Static analysis result for SHA-256 1ca6333aef5b75f3…

MALICIOUS

Office (OLE) / .XLS

535.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-11-07
MD5: 51d951937213b4809129cc526a855d56 SHA-1: 0d9aa07b0bcb9f76c26c210416ce0fb98c680173 SHA-256: 1ca6333aef5b75f36c2bec4d5b89bd7048c3b8b9b3993bd9e1dc6c97de56a5a0
108 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The critical heuristic firing for CVE_2017_11882_EQUATION_OLE10NATIVE indicates that the file contains a payload designed to exploit this known vulnerability in Microsoft Equation Editor. The presence of an OLE object related to Equation Editor further supports this finding. The VBA macros are present but do not contain 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
7f506327609c082af1cd37dde23bc2c71a000f7d1ef530b6abb66775040a7673		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 1206 bytes
ole10native_00.bin
fa0957426493b7069720f61933f74837d2f2dbc655873fcb80fbb59db34ed2cf		 ole-package OLE Ole10Native stream: MBD01343C7C/olE10naTivE 1501 bytes

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