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

Static analysis result for SHA-256 feb28503309c731d…

MALICIOUS

Office (OLE) / .XLS

1.25 MB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-02-18
MD5: aa4a552ad62a3a6f44f3682f399edadc SHA-1: ed01996b1f6ae82750b62bc223b24e0301789943 SHA-256: feb28503309c731d3ba4fdb70a6995558110b92151460258b9ecb9425ec8e9dd
108 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is an Excel file containing an embedded Equation Editor OLE object. Heuristics indicate exploitation of CVE-2017-11882, a known vulnerability in the Equation Editor component. This vulnerability allows for arbitrary code execution when the malicious object is processed, likely leading to the download and execution of 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
7f506327609c082af1cd37dde23bc2c71a000f7d1ef530b6abb66775040a7673		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 1206 bytes
ole10native_00.bin
cce3795f1f80a17f9d257d14b5080ed7bf18744d9bcd499d1834565e61188595		 ole-package OLE Ole10Native stream: MBD022A6AF1/oLE10NatiVE 1911 bytes

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