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

Static analysis result for SHA-256 331d6fab4c70a705…

MALICIOUS

Office (OLE) / .XLS

569.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-11-15
MD5: 885b7a7dc16b96d8385054c41179e255 SHA-1: 2e26a5664f1f1ec5d27b8830676f13c102b93fb7 SHA-256: 331d6fab4c70a705949d80d3d10730ae72b78fe3f4ab3eb25cef52df9fc4f07a
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 this Excel file contains a malicious Equation Editor object exploiting CVE-2017-11882. This vulnerability allows for arbitrary code execution when the object is processed, leading to the delivery of a secondary payload. No VBA macros were found to be executable, suggesting the exploit is the primary delivery mechanism.

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
b01fb4eb1597a00879a4c422f760139f6fab366c988a6c7ca1f7021d93ee79ec		 ole-package OLE Ole10Native stream: MBD01A764A3/OLe10NAtiVE 1425 bytes

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